diff --git a/api/extras.json b/api/extras.json
index 2c1dc374..3fa65e5b 100644
--- a/api/extras.json
+++ b/api/extras.json
@@ -1,9 +1,23 @@
 {
   "diffusion": [
-    ["diffusion-knollingcase", "Aybeeceedee/knollingcase"],
-    ["diffusion-openjourney", "prompthero/openjourney"],
-    ["diffusion-stably-diffused-onnx-v2-6", "../models/tensors/stablydiffuseds_26.safetensors"],
-    ["diffusion-unstable-ink-dream-onnx-v6", "../models/tensors/unstableinkdream_v6.safetensors"]
+    {
+      "name": "diffusion-knollingcase",
+      "source": "Aybeeceedee/knollingcase"
+    },
+    {
+      "name": "diffusion-openjourney",
+      "source": "prompthero/openjourney"
+    },
+    {
+      "name": "diffusion-stablydiffused-aesthetic-v2-6",
+      "source": "civitai://6266?type=Pruned%20Model&format=SafeTensor",
+      "format": "safetensors"
+    },
+    {
+      "name": "diffusion-unstable-ink-dream-v6",
+      "source": "civitai://5796",
+      "format": "safetensors"
+    }
   ],
   "correction": [],
   "upscaling": []
diff --git a/api/onnx_web/convert/__main__.py b/api/onnx_web/convert/__main__.py
index 13e6d7a6..86f13659 100644
--- a/api/onnx_web/convert/__main__.py
+++ b/api/onnx_web/convert/__main__.py
@@ -1,9 +1,3 @@
-from .correction_gfpgan import convert_correction_gfpgan
-from .diffusion_original import convert_diffusion_original
-from .diffusion_stable import convert_diffusion_stable
-from .upscale_resrgan import convert_upscale_resrgan
-from .utils import ConversionContext
-
 import warnings
 from argparse import ArgumentParser
 from json import loads
@@ -11,9 +5,17 @@ from logging import getLogger
 from os import environ, makedirs, path
 from sys import exit
 from typing import Dict, List, Optional, Tuple
+from yaml import safe_load
+from jsonschema import validate, ValidationError
 
 import torch
 
+from .correction_gfpgan import convert_correction_gfpgan
+from .diffusion_original import convert_diffusion_original
+from .diffusion_stable import convert_diffusion_stable
+from .upscale_resrgan import convert_upscale_resrgan
+from .utils import ConversionContext, download_progress, source_format, tuple_to_correction, tuple_to_diffusion, tuple_to_upscaling
+
 # suppress common but harmless warnings, https://github.com/ssube/onnx-web/issues/75
 warnings.filterwarnings(
     "ignore", ".*The shape inference of prim::Constant type is missing.*"
@@ -29,20 +31,39 @@ Models = Dict[str, List[Tuple[str, str, Optional[int]]]]
 logger = getLogger(__name__)
 
 
+model_sources: Dict[str, Tuple[str, str]] = {
+    "civitai://": ("Civitai", "https://civitai.com/api/download/models/%s"),
+}
+
+model_source_huggingface = "huggingface://"
+
 # recommended models
 base_models: Models = {
     "diffusion": [
         # v1.x
-        ("stable-diffusion-onnx-v1-5", "runwayml/stable-diffusion-v1-5"),
-        ("stable-diffusion-onnx-v1-inpainting", "runwayml/stable-diffusion-inpainting"),
-        # v2.x
-        ("stable-diffusion-onnx-v2-1", "stabilityai/stable-diffusion-2-1"),
         (
-            "stable-diffusion-onnx-v2-inpainting",
-            "stabilityai/stable-diffusion-2-inpainting",
+            "stable-diffusion-onnx-v1-5",
+            model_source_huggingface + "runwayml/stable-diffusion-v1-5",
         ),
+        # (
+        #     "stable-diffusion-onnx-v1-inpainting",
+        #     model_source_huggingface + "runwayml/stable-diffusion-inpainting",
+        # ),
+        # v2.x
+        # (
+        #     "stable-diffusion-onnx-v2-1",
+        #     model_source_huggingface + "stabilityai/stable-diffusion-2-1",
+        # ),
+        # (
+        #     "stable-diffusion-onnx-v2-inpainting",
+        #     model_source_huggingface + "stabilityai/stable-diffusion-2-inpainting",
+        # ),
         # TODO: should have its own converter
-        ("upscaling-stable-diffusion-x4", "stabilityai/stable-diffusion-x4-upscaler"),
+        (
+            "upscaling-stable-diffusion-x4",
+            model_source_huggingface + "stabilityai/stable-diffusion-x4-upscaler",
+            True,
+        ),
     ],
     "correction": [
         (
@@ -79,35 +100,86 @@ model_path = environ.get("ONNX_WEB_MODEL_PATH", path.join("..", "models"))
 training_device = "cuda" if torch.cuda.is_available() else "cpu"
 
 
-def load_models(args, ctx: ConversionContext, models: Models):
+def fetch_model(ctx: ConversionContext, name: str, source: str, format: Optional[str] = None) -> str:
+    cache_name = path.join(ctx.cache_path, name)
+    if format is not None:
+        # add an extension if possible, some of the conversion code checks for it
+        cache_name = "%s.%s" % (cache_name, format)
+
+    for proto in model_sources:
+        api_name, api_root = model_sources.get(proto)
+        if source.startswith(proto):
+            api_source = api_root % (source.removeprefix(proto))
+            logger.info("Downloading model from %s: %s -> %s", api_name, api_source, cache_name)
+            return download_progress([(api_source, cache_name)])
+
+    if source.startswith(model_source_huggingface):
+        hub_source = source.removeprefix(model_source_huggingface)
+        logger.info("Downloading model from Huggingface Hub: %s", hub_source)
+        # from_pretrained has a bunch of useful logic that snapshot_download by itself down not
+        return hub_source
+    elif source.startswith("https://"):
+        logger.info("Downloading model from: %s", source)
+        return download_progress([(source, cache_name)])
+    elif source.startswith("http://"):
+        logger.warning("Downloading model from insecure source: %s", source)
+        return download_progress([(source, cache_name)])
+    elif source.startswith(path.sep) or source.startswith("."):
+        logger.info("Using local model: %s", source)
+        return source
+    else:
+        logger.info("Unknown model location, using path as provided: %s", source)
+        return source
+
+
+def convert_models(ctx: ConversionContext, args, models: Models):
     if args.diffusion:
-        for source in models.get("diffusion"):
-            name, file = source
+        for model in models.get("diffusion"):
+            model = tuple_to_diffusion(model)
+            name = model.get("name")
+
             if name in args.skip:
-                logger.info("Skipping model: %s", source[0])
+                logger.info("Skipping model: %s", name)
             else:
-                if file.endswith(".safetensors") or file.endswith(".ckpt"):
-                    convert_diffusion_original(ctx, *source, args.opset, args.half)
+                format = source_format(model)
+                source = fetch_model(ctx, name, model["source"], format=format)
+
+                if format in ["safetensors", "ckpt"]:
+                    convert_diffusion_original(
+                        ctx,
+                        model,
+                        source,
+                    )
                 else:
-                    # TODO: make this a parameter in the JSON/dict
-                    single_vae = "upscaling" in source[0]
                     convert_diffusion_stable(
-                        ctx, *source, args.opset, args.half, args.token, single_vae=single_vae
+                        ctx,
+                        model,
+                        source,
                     )
 
     if args.upscaling:
-        for source in models.get("upscaling"):
-            if source[0] in args.skip:
-                logger.info("Skipping model: %s", source[0])
+        for model in models.get("upscaling"):
+            model = tuple_to_upscaling(model)
+            name = model.get("name")
+
+            if name in args.skip:
+                logger.info("Skipping model: %s", name)
             else:
-                convert_upscale_resrgan(ctx, *source, args.opset)
+                format = source_format(model)
+                source = fetch_model(ctx, name, model["source"], format=format)
+                convert_upscale_resrgan(ctx, model, source)
 
     if args.correction:
-        for source in models.get("correction"):
-            if source[0] in args.skip:
-                logger.info("Skipping model: %s", source[0])
+        for model in models.get("correction"):
+            model = tuple_to_correction(model)
+            name = model.get("name")
+
+            if name in args.skip:
+                logger.info("Skipping model: %s", name)
             else:
-                convert_correction_gfpgan(ctx, *source, args.opset)
+                format = source_format(model)
+                source = fetch_model(ctx, name, model["source"], format=format)
+                convert_correction_gfpgan(ctx, model, source)
 
 
 def main() -> int:
@@ -146,7 +218,7 @@ def main() -> int:
     args = parser.parse_args()
     logger.info("CLI arguments: %s", args)
 
-    ctx = ConversionContext(model_path, training_device)
+    ctx = ConversionContext(model_path, training_device, half=args.half, opset=args.opset, token=args.token)
     logger.info("Converting models in %s using %s", ctx.model_path, ctx.training_device)
 
     if not path.exists(model_path):
@@ -154,16 +226,26 @@ def main() -> int:
         makedirs(model_path)
 
     logger.info("Converting base models.")
-    load_models(args, ctx, base_models)
+    convert_models(ctx, args, base_models)
 
     for file in args.extras:
         if file is not None and file != "":
             logger.info("Loading extra models from %s", file)
             try:
                 with open(file, "r") as f:
-                    data = loads(f.read())
+                    data = safe_load(f.read())
+
+                with open("./schemas/extras.yaml", "r") as f:
+                    schema = safe_load(f.read())
+
+                logger.debug("validating chain request: %s against %s", data, schema)
+
+                try:
+                    validate(data, schema)
                     logger.info("Converting extra models.")
-                    load_models(args, ctx, data)
+                    convert_models(ctx, args, data)
+                except ValidationError as err:
+                    logger.error("Invalid data in extras file: %s", err)
             except Exception as err:
                 logger.error("Error converting extra models: %s", err)
 
diff --git a/api/onnx_web/convert/correction_gfpgan.py b/api/onnx_web/convert/correction_gfpgan.py
index 13a32c8b..d0ec6d18 100644
--- a/api/onnx_web/convert/correction_gfpgan.py
+++ b/api/onnx_web/convert/correction_gfpgan.py
@@ -1,31 +1,34 @@
-import torch
+from logging import getLogger
+from os import path
 from shutil import copyfile
+
+import torch
+from basicsr.archs.rrdbnet_arch import RRDBNet
 from basicsr.utils.download_util import load_file_from_url
 from torch.onnx import export
-from os import path
-from logging import getLogger
-from basicsr.archs.rrdbnet_arch import RRDBNet
-from .utils import ConversionContext
+
+from .utils import ConversionContext, ModelDict
 
 logger = getLogger(__name__)
 
-@torch.no_grad()
-def convert_correction_gfpgan(ctx: ConversionContext, name: str, url: str, scale: int, opset: int):
-    dest_path = path.join(ctx.model_path, name + ".pth")
-    dest_onnx = path.join(ctx.model_path, name + ".onnx")
-    logger.info("converting GFPGAN model: %s -> %s", name, dest_onnx)
 
-    if path.isfile(dest_onnx):
+@torch.no_grad()
+def convert_correction_gfpgan(
+    ctx: ConversionContext,
+    model: ModelDict,
+    source: str,
+):
+    name = model.get("name")
+    source = source or model.get("source")
+    scale = model.get("scale")
+
+    dest = path.join(ctx.model_path, name + ".onnx")
+    logger.info("converting GFPGAN model: %s -> %s", name, dest)
+
+    if path.isfile(dest):
         logger.info("ONNX model already exists, skipping.")
         return
 
-    if not path.isfile(dest_path):
-        logger.info("PTH model not found, downloading...")
-        download_path = load_file_from_url(
-            url=url, model_dir=dest_path + "-cache", progress=True, file_name=None
-        )
-        copyfile(download_path, dest_path)
-
     logger.info("loading and training model")
     model = RRDBNet(
         num_in_ch=3,
@@ -36,7 +39,7 @@ def convert_correction_gfpgan(ctx: ConversionContext, name: str, url: str, scale
         scale=scale,
     )
 
-    torch_model = torch.load(dest_path, map_location=ctx.map_location)
+    torch_model = torch.load(source, map_location=ctx.map_location)
     # TODO: make sure strict=False is safe here
     if "params_ema" in torch_model:
         model.load_state_dict(torch_model["params_ema"], strict=False)
@@ -54,15 +57,15 @@ def convert_correction_gfpgan(ctx: ConversionContext, name: str, url: str, scale
         "output": {2: "width", 3: "height"},
     }
 
-    logger.info("exporting ONNX model to %s", dest_onnx)
+    logger.info("exporting ONNX model to %s", dest)
     export(
         model,
         rng,
-        dest_onnx,
+        dest,
         input_names=input_names,
         output_names=output_names,
         dynamic_axes=dynamic_axes,
-        opset_version=opset,
+        opset_version=ctx.opset,
         export_params=True,
     )
     logger.info("GFPGAN exported to ONNX successfully.")
diff --git a/api/onnx_web/convert/diffusion_original.py b/api/onnx_web/convert/diffusion_original.py
index c39715f5..470ce847 100644
--- a/api/onnx_web/convert/diffusion_original.py
+++ b/api/onnx_web/convert/diffusion_original.py
@@ -11,6 +11,17 @@
 # TODO: ask about license before merging
 ###
 
+import json
+import os
+import re
+import shutil
+import traceback
+from logging import getLogger
+from typing import Dict, List
+
+import huggingface_hub.utils.tqdm
+import safetensors.torch
+import torch
 from diffusers import (
     AutoencoderKL,
     DDIMScheduler,
@@ -20,95 +31,34 @@ from diffusers import (
     HeunDiscreteScheduler,
     LDMTextToImagePipeline,
     LMSDiscreteScheduler,
+    PaintByExamplePipeline,
     PNDMScheduler,
     StableDiffusionPipeline,
-    UNet2DConditionModel, PaintByExamplePipeline,
+    UNet2DConditionModel,
+)
+from diffusers.pipelines.latent_diffusion.pipeline_latent_diffusion import (
+    LDMBertConfig,
+    LDMBertModel,
 )
-from diffusers.pipelines.latent_diffusion.pipeline_latent_diffusion import LDMBertConfig, LDMBertModel
 from diffusers.pipelines.paint_by_example import PaintByExampleImageEncoder
 from diffusers.pipelines.stable_diffusion import StableDiffusionSafetyChecker
 from huggingface_hub import HfApi, hf_hub_download
-from logging import getLogger
 from omegaconf import OmegaConf
 from pydantic import BaseModel
-from transformers import AutoFeatureExtractor, BertTokenizerFast, CLIPTextModel, CLIPTokenizer, CLIPVisionConfig
-from typing import Dict, List, Union
-
-import huggingface_hub.utils.tqdm
-import json
-import os
-import re
-import safetensors.torch
-import shutil
-import torch
-import traceback
+from transformers import (
+    AutoFeatureExtractor,
+    BertTokenizerFast,
+    CLIPTextModel,
+    CLIPTokenizer,
+    CLIPVisionConfig,
+)
 
 from .diffusion_stable import convert_diffusion_stable
-from .utils import ConversionContext
+from .utils import ConversionContext, ModelDict
 
 logger = getLogger(__name__)
 
 
-def get_images():
-    return []
-
-class Concept(BaseModel):
-    class_data_dir: str = ""
-    class_guidance_scale: float = 7.5
-    class_infer_steps: int = 60
-    class_negative_prompt: str = ""
-    class_prompt: str = ""
-    class_token: str = ""
-    instance_data_dir: str = ""
-    instance_prompt: str = ""
-    instance_token: str = ""
-    is_valid: bool = False
-    n_save_sample: int = 1
-    num_class_images: int = 0
-    num_class_images_per: int = 0
-    sample_seed: int = -1
-    save_guidance_scale: float = 7.5
-    save_infer_steps: int = 60
-    save_sample_negative_prompt: str = ""
-    save_sample_prompt: str = ""
-    save_sample_template: str = ""
-
-    def __init__(self, input_dict: Union[Dict, None] = None, **kwargs):
-        super().__init__(**kwargs)
-        if input_dict is not None:
-            self.load_params(input_dict)
-        if self.is_valid and self.num_class_images != 0:
-            if self.num_class_images_per == 0:
-                images = get_images(self.instance_data_dir)
-                if len(images) < self.num_class_images * 2:
-                    self.num_class_images_per = 1
-                else:
-                    self.num_class_images_per = self.num_class_images // len(images)
-                self.num_class_images = 0
-
-    def to_dict(self):
-        return self.dict()
-
-    def to_json(self):
-        return json.dumps(self.to_dict())
-
-    def load_params(self, params_dict):
-        for key, value in params_dict.items():
-            if hasattr(self, key):
-                setattr(self, key, value)
-            if self.instance_data_dir:
-                self.is_valid = os.path.isdir(self.instance_data_dir)
-            else:
-                self.is_valid = False
-
-
-# Keys to save, replacing our dumb __init__ method
-save_keys = []
-
-# Keys to return to the ui when Load Settings is clicked.
-ui_keys = []
-
-
 def sanitize_name(name):
     return "".join(x for x in name if (x.isalnum() or x in "._- "))
 
@@ -200,7 +150,7 @@ class DreamboothConfig(BaseModel):
 
         super().__init__(**kwargs)
         model_name = sanitize_name(model_name)
-        model_dir = os.path.join(ctx.model_path, model_name)
+        model_dir = os.path.join(ctx.cache_path, model_name)
         working_dir = os.path.join(model_dir, "working")
 
         if not os.path.exists(working_dir):
@@ -214,7 +164,6 @@ class DreamboothConfig(BaseModel):
         self.scheduler = scheduler
         self.v2 = v2
 
-    # Actually save as a file
     def save(self, backup=False):
         """
         Save the config file
@@ -236,132 +185,6 @@ class DreamboothConfig(BaseModel):
             if hasattr(self, key):
                 setattr(self, key, value)
 
-    # Pass a dict and return a list of Concept objects
-    def concepts(self, required: int = -1):
-        concepts = []
-        c_idx = 0
-        # If using a file for concepts and not requesting from UI, load from file
-        if self.use_concepts and self.concepts_path and required == -1:
-            concepts_list = concepts_from_file(self.concepts_path)
-
-        # Otherwise, use 'stored' list
-        else:
-            concepts_list = self.concepts_list
-        if required == -1:
-            required = len(concepts_list)
-
-        for concept_dict in concepts_list:
-            concept = Concept(input_dict=concept_dict)
-            if concept.is_valid:
-                if concept.class_data_dir == "" or concept.class_data_dir is None:
-                    concept.class_data_dir = os.path.join(self.model_dir, f"classifiers_{c_idx}")
-                concepts.append(concept)
-                c_idx += 1
-
-        missing = len(concepts) - required
-        if missing > 0:
-            concepts.extend([Concept(None)] * missing)
-        return concepts
-
-    # Set default values
-    def check_defaults(self):
-        if self.model_name is not None and self.model_name != "":
-            if self.revision == "" or self.revision is None:
-                self.revision = 0
-            if self.epoch == "" or self.epoch is None:
-                self.epoch = 0
-            self.model_name = "".join(x for x in self.model_name if (x.isalnum() or x in "._- "))
-            models_path = "." # TODO: use ctx path
-            model_dir = os.path.join(models_path, self.model_name)
-            working_dir = os.path.join(model_dir, "working")
-            if not os.path.exists(working_dir):
-                os.makedirs(working_dir)
-            self.model_dir = model_dir
-            self.pretrained_model_name_or_path = working_dir
-
-
-def concepts_from_file(concepts_path: str):
-    concepts = []
-    if os.path.exists(concepts_path) and os.path.isfile(str):
-        try:
-            with open(concepts_path,"r") as concepts_file:
-                concepts_str = concepts_file.read()
-        except Exception as e:
-            print(f"Exception opening concepts file: {e}")
-    else:
-        concepts_str = concepts_path
-
-    try:
-        concepts_data = json.loads(concepts_str)
-        for concept_data in concepts_data:
-            concept = Concept(input_dict=concept_data)
-            if concept.is_valid:
-                concepts.append(concept.__dict__)
-    except Exception as e:
-        print(f"Exception parsing concepts: {e}")
-    return concepts
-
-
-def save_config(*args):
-    raise Exception("where tho")
-    params = list(args)
-    concept_keys = ["c1_", "c2_", "c3_", "c4_"]
-    model_name = params[0]
-    if model_name is None or model_name == "":
-        print("Invalid model name.")
-        return
-    config = from_file(ctx, model_name)
-    if config is None:
-        config = DreamboothConfig(model_name)
-    params_dict = dict(zip(save_keys, params))
-    concepts_list = []
-    # If using a concepts file/string, keep concepts_list empty.
-    if params_dict["db_use_concepts"] and params_dict["db_concepts_path"]:
-        concepts_list = []
-        params_dict["concepts_list"] = concepts_list
-    else:
-        for concept_key in concept_keys:
-            concept_dict = {}
-            for key, param in params_dict.items():
-                if concept_key in key and param is not None:
-                    concept_dict[key.replace(concept_key, "")] = param
-            concept_test = Concept(concept_dict)
-            if concept_test.is_valid:
-                concepts_list.append(concept_test.__dict__)
-        existing_concepts = params_dict["concepts_list"] if "concepts_list" in params_dict else []
-        if len(concepts_list) and not len(existing_concepts):
-            params_dict["concepts_list"] = concepts_list
-
-    config.load_params(params_dict)
-    config.save()
-
-
-def from_file(ctx: ConversionContext, model_name):
-    """
-    Load config data from UI
-    Args:
-        model_name: The config to load
-
-    Returns: Dict | None
-
-    """
-    if model_name == "" or model_name is None:
-        return None
-
-    model_name = sanitize_name(model_name)
-    config_file = os.path.join(ctx.model_path, model_name, "db_config.json")
-    try:
-        with open(config_file, 'r') as openfile:
-            config_dict = json.load(openfile)
-
-        config = DreamboothConfig(model_name)
-        config.load_params(config_dict)
-        return config
-    except Exception as e:
-        print(f"Exception loading config: {e}")
-        traceback.print_exc()
-        return None
-
 
 # coding=utf-8
 # Copyright 2022 The HuggingFace Inc. team.
@@ -379,8 +202,6 @@ def from_file(ctx: ConversionContext, model_name):
 # limitations under the License.
 """ Conversion script for the LDM checkpoints. """
 
-def get_db_models():
-    return []
 
 def shave_segments(path, n_shave_prefix_segments=1):
     """
@@ -1075,7 +896,7 @@ def convert_open_clip_checkpoint(checkpoint):
     if 'cond_stage_model.model.text_projection' in checkpoint:
         d_model = int(checkpoint['cond_stage_model.model.text_projection'].shape[0])
     else:
-        print("No projection shape found, setting to 1024")
+        logger.debug("No projection shape found, setting to 1024")
         d_model = 1024
     text_model_dict["text_model.embeddings.position_ids"] = text_model.text_model.embeddings.get_buffer("position_ids")
 
@@ -1130,7 +951,7 @@ def replace_symlinks(path, base):
             blob_path = None
 
         if blob_path is None:
-            print("NO BLOB")
+            logger.debug("NO BLOB")
             return
         os.replace(blob_path, path)
     elif os.path.isdir(path):
@@ -1140,7 +961,6 @@ def replace_symlinks(path, base):
 
 def download_model(db_config: DreamboothConfig, token):
     tmp_dir = os.path.join(db_config.model_dir, "src")
-    working_dir = db_config.pretrained_model_name_or_path
 
     hub_url = db_config.src
     if "http" in hub_url or "huggingface.co" in hub_url:
@@ -1155,7 +975,7 @@ def download_model(db_config: DreamboothConfig, token):
     )
 
     if repo_info.sha is None:
-        print("Unable to fetch repo?")
+        logger.warning("Unable to fetch repo?")
         return None, None
 
     siblings = repo_info.siblings
@@ -1208,10 +1028,10 @@ def download_model(db_config: DreamboothConfig, token):
     if files_to_fetch and config_file:
         files_to_fetch.append(config_file)
 
-    print(f"Fetching files: {files_to_fetch}")
+    logger.info(f"Fetching files: {files_to_fetch}")
 
     if not len(files_to_fetch):
-        print("Nothing to fetch!")
+        logger.debug("Nothing to fetch!")
         return None, None
 
 
@@ -1296,9 +1116,6 @@ def get_config_file(train_unfrozen=False, v2=False, prediction_type="epsilon"):
 
     return get_config_path(model_version_name, model_train_type, config_base_name, prediction_type)
 
-    print("Could not find valid config. Returning default v1 config.")
-    return get_config_path(model_versions["v1"], train_types["default"], config_base_name, prediction_type="epsilon")
-
 
 def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_file: str, scheduler_type="ddim", from_hub=False, new_model_url="",
                        new_model_token="", extract_ema=False, train_unfrozen=False, is_512=True):
@@ -1352,7 +1169,7 @@ def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_f
         if db_config is not None:
             original_config_file = config
         if model_info is not None:
-            print("Got model info.")
+            logger.debug("Got model info.")
             if ".ckpt" in model_info or ".safetensors" in model_info:
                 # Set this to false, because we have a checkpoint where we can *maybe* get a revision.
                 from_hub = False
@@ -1360,28 +1177,26 @@ def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_f
                 checkpoint_file = model_info
         else:
             msg = "Unable to fetch model from hub."
-            print(msg)
+            logger.warning(msg)
             return "", "", 0, 0, "", "", "", "", image_size, "", msg
 
-    reset_safe = False
-
     try:
         checkpoint = None
         map_location = torch.device("cpu")
 
         # Try to determine if v1 or v2 model if we have a ckpt
         if not from_hub:
-            print("Loading model from checkpoint.")
+            logger.info("Loading model from checkpoint.")
             _, extension = os.path.splitext(checkpoint_file)
             if extension.lower() == ".safetensors":
                 os.environ["SAFETENSORS_FAST_GPU"] = "1"
                 try:
-                    print("Loading safetensors...")
+                    logger.debug("Loading safetensors...")
                     checkpoint = safetensors.torch.load_file(checkpoint_file, device="cpu")
                 except Exception as e:
                     checkpoint = torch.jit.load(checkpoint_file)
             else:
-                print("Loading ckpt...")
+                logger.debug("Loading ckpt...")
                 checkpoint = torch.load(checkpoint_file, map_location=map_location)
                 checkpoint = checkpoint["state_dict"] if "state_dict" in checkpoint else checkpoint
 
@@ -1401,7 +1216,7 @@ def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_f
             if key_name in checkpoint and checkpoint[key_name].shape[-1] == 1024:
                 if not is_512:
                     # v2.1 needs to upcast attention
-                    print("Setting upcast_attention")
+                    logger.debug("Setting upcast_attention")
                     upcast_attention = True
                 v2 = True
             else:
@@ -1410,15 +1225,15 @@ def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_f
             unet_dir = os.path.join(db_config.pretrained_model_name_or_path, "unet")
             try:
                 unet = UNet2DConditionModel.from_pretrained(unet_dir)
-                print("Loaded unet.")
+                logger.debug("Loaded unet.")
                 unet_dict = unet.state_dict()
                 key_name = "down_blocks.2.attentions.1.transformer_blocks.0.attn2.to_k.weight"
                 if key_name in unet_dict and unet_dict[key_name].shape[-1] == 1024:
-                    print("We got v2!")
+                    logger.debug("UNet using v2 parameters.")
                     v2 = True
 
             except:
-                print("Exception loading unet!")
+                logger.error("Exception loading unet!")
                 traceback.print_exc()
 
         if v2 and not is_512:
@@ -1428,7 +1243,7 @@ def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_f
 
         original_config_file = get_config_file(train_unfrozen, v2, prediction_type)
 
-        print(f"Pred and size are {prediction_type} and {image_size}, using config: {original_config_file}")
+        logger.info(f"Pred and size are {prediction_type} and {image_size}, using config: {original_config_file}")
         db_config.resolution = image_size
         db_config.lifetime_revision = revision
         db_config.epoch = epoch
@@ -1438,7 +1253,7 @@ def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_f
             db_config.save()
             return
 
-        print(f"{'v2' if v2 else 'v1'} model loaded.")
+        logger.info(f"{'v2' if v2 else 'v1'} model loaded.")
 
         # Use existing YAML if present
         if checkpoint_file is not None:
@@ -1447,10 +1262,10 @@ def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_f
                 original_config_file = config_check
 
         if original_config_file is None or not os.path.exists(original_config_file):
-            print("Unable to select a config file: %s" % (original_config_file))
+            logger.warning("Unable to select a config file: %s" % (original_config_file))
             return "", "", 0, 0, "", "", "", "", image_size, "", "Unable to find a config file."
 
-        print(f"Trying to load: {original_config_file}")
+        logger.debug(f"Trying to load: {original_config_file}")
         original_config = OmegaConf.load(original_config_file)
 
         num_train_timesteps = original_config.model.params.timesteps
@@ -1489,7 +1304,7 @@ def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_f
             raise ValueError(f"Scheduler of type {scheduler_type} doesn't exist!")
 
 
-        print("Converting unet...")
+        logger.info("Converting UNet...")
         # Convert the UNet2DConditionModel model.
         unet_config = create_unet_diffusers_config(original_config, image_size=image_size)
         unet_config["upcast_attention"] = upcast_attention
@@ -1501,14 +1316,16 @@ def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_f
         db_config.has_ema = has_ema
         db_config.save()
         unet.load_state_dict(converted_unet_checkpoint)
-        print("Converting vae...")
+
+        logger.info("Converting VAE...")
         # Convert the VAE model.
         vae_config = create_vae_diffusers_config(original_config, image_size=image_size)
         converted_vae_checkpoint = convert_ldm_vae_checkpoint(checkpoint, vae_config)
 
         vae = AutoencoderKL(**vae_config)
         vae.load_state_dict(converted_vae_checkpoint)
-        print("Converting text encoder...")
+
+        logger.info("Converting text encoder...")
         # Convert the text model.
         text_model_type = original_config.model.params.cond_stage_config.target.split(".")[-1]
         if text_model_type == "FrozenOpenCLIPEmbedder":
@@ -1557,17 +1374,17 @@ def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_f
             pipe = LDMTextToImagePipeline(vqvae=vae, bert=text_model, tokenizer=tokenizer, unet=unet,
                                           scheduler=scheduler)
     except Exception as e:
-        print(f"Exception setting up output: {e}")
+        logger.error(f"Exception setting up output: {e}")
         pipe = None
         traceback.print_exc()
 
     if pipe is None or db_config is None:
         msg = "Pipeline or config is not set, unable to continue."
-        print(msg)
+        logger.error(msg)
         return "", "", 0, 0, "", "", "", "", image_size, "", msg
     else:
         resolution = db_config.resolution
-        print("Saving diffusion model...")
+        logger.info("Saving diffusion model...")
         pipe.save_pretrained(db_config.pretrained_model_name_or_path)
         result_status = f"Checkpoint successfully extracted to {db_config.pretrained_model_name_or_path}"
         model_dir = db_config.model_dir
@@ -1576,12 +1393,12 @@ def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_f
         src = db_config.src
         required_dirs = ["unet", "vae", "text_encoder", "scheduler", "tokenizer"]
         if original_config_file is not None and os.path.exists(original_config_file):
-            logger.warn("copying original config: %s -> %s", original_config_file, db_config.model_dir)
+            logger.warning("copying original config: %s -> %s", original_config_file, db_config.model_dir)
             shutil.copy(original_config_file, db_config.model_dir)
             basename = os.path.basename(original_config_file)
             new_ex_path = os.path.join(db_config.model_dir, basename)
             new_name = os.path.join(db_config.model_dir, f"{db_config.model_name}.yaml")
-            logger.warn("copying model config to new name: %s -> %s", new_ex_path, new_name)
+            logger.warning("copying model config to new name: %s -> %s", new_ex_path, new_name)
             if os.path.exists(new_name):
                 os.remove(new_name)
             os.rename(new_ex_path, new_name)
@@ -1601,27 +1418,35 @@ def extract_checkpoint(ctx: ConversionContext, new_model_name: str, checkpoint_f
                     os.makedirs(rem_dir)
 
 
-    print(result_status)
+    logger.info(result_status)
 
     return
 
-def convert_diffusion_original(ctx: ConversionContext, model_name: str, tensor_file: str, opset: int, half: bool):
-    model_path = os.path.join(ctx.model_path, model_name)
-    torch_name = model_name.replace("onnx", "torch")
-    torch_path = os.path.join(ctx.model_path, torch_name)
-    working_name = os.path.join(ctx.model_path, torch_name, "working")
-    logger.info("Converting original Diffusers checkpoint %s: %s -> %s", model_name, tensor_file, model_path)
+def convert_diffusion_original(
+    ctx: ConversionContext,
+    model: ModelDict,
+    source: str,
+):
+    name = model["name"]
+    source = source or model["source"]
 
-    if os.path.exists(model_path):
+    dest = os.path.join(ctx.model_path, name)
+    logger.info("Converting original Diffusers checkpoint %s: %s -> %s", name, source, dest)
+
+    if os.path.exists(dest):
         logger.info("ONNX pipeline already exists, skipping.")
         return
 
+    torch_name = name + "-torch"
+    torch_path = os.path.join(ctx.cache_path, torch_name)
+    working_name = os.path.join(ctx.cache_path, torch_name, "working")
+
     if os.path.exists(torch_path):
         logger.info("Torch pipeline already exists, reusing.")
     else:
-        logger.info("Converting original Diffusers check to Torch model: %s -> %s", tensor_file, torch_path)
-        extract_checkpoint(ctx, torch_name, tensor_file, from_hub=False)
+        logger.info("Converting original Diffusers check to Torch model: %s -> %s", source, torch_path)
+        extract_checkpoint(ctx, torch_name, source, from_hub=False)
         logger.info("Converted original Diffusers checkpoint to Torch model.")
 
-    convert_diffusion_stable(ctx, model_path, working_name, opset, half, None)
-    logger.info("ONNX pipeline saved to %s", model_name)
\ No newline at end of file
+    convert_diffusion_stable(ctx, model, working_name)
+    logger.info("ONNX pipeline saved to %s", name)
diff --git a/api/onnx_web/convert/diffusion_stable.py b/api/onnx_web/convert/diffusion_stable.py
index c52882ac..fd8a0ecd 100644
--- a/api/onnx_web/convert/diffusion_stable.py
+++ b/api/onnx_web/convert/diffusion_stable.py
@@ -1,19 +1,22 @@
+from logging import getLogger
+from os import mkdir, path
+from pathlib import Path
+from shutil import rmtree
+from typing import Dict
+
+import torch
 from diffusers import (
     OnnxRuntimeModel,
     OnnxStableDiffusionPipeline,
     StableDiffusionPipeline,
 )
-from torch.onnx import export
-from logging import getLogger
-
-from shutil import rmtree
-import torch
-from os import path, mkdir
-from pathlib import Path
 from onnx import load, save_model
+from torch.onnx import export
 
+from ..diffusion.pipeline_onnx_stable_diffusion_upscale import (
+    OnnxStableDiffusionUpscalePipeline,
+)
 from .utils import ConversionContext
-from ..diffusion.pipeline_onnx_stable_diffusion_upscale import OnnxStableDiffusionUpscalePipeline
 
 logger = getLogger(__name__)
 
@@ -47,22 +50,22 @@ def onnx_export(
 
 @torch.no_grad()
 def convert_diffusion_stable(
-  ctx: ConversionContext,
-    name: str,
-    url: str,
-    opset: int,
-    half: bool,
-    token: str,
-    single_vae: bool = False,
+    ctx: ConversionContext,
+    model: Dict,
+    source: str,
 ):
     """
     From https://github.com/huggingface/diffusers/blob/main/scripts/convert_stable_diffusion_checkpoint_to_onnx.py
     """
-    dtype = torch.float16 if half else torch.float32
+    name = model.get("name")
+    source = source or model.get("source")
+    single_vae = model.get("single_vae")
+
+    dtype = torch.float16 if ctx.half else torch.float32
     dest_path = path.join(ctx.model_path, name)
 
     # diffusers go into a directory rather than .onnx file
-    logger.info("converting Stable Diffusion model %s: %s -> %s/", name, url, dest_path)
+    logger.info("converting Stable Diffusion model %s: %s -> %s/", name, source, dest_path)
 
     if single_vae:
         logger.info("converting model with single VAE")
@@ -71,13 +74,16 @@ def convert_diffusion_stable(
         logger.info("ONNX model already exists, skipping.")
         return
 
-    if half and ctx.training_device != "cuda":
+    if ctx.half and ctx.training_device != "cuda":
         raise ValueError(
             "Half precision model export is only supported on GPUs with CUDA"
         )
 
     pipeline = StableDiffusionPipeline.from_pretrained(
-        url, torch_dtype=dtype, use_auth_token=token
+        source,
+        torch_dtype=dtype,
+        use_auth_token=ctx.token,
+        # cache_dir=path.join(ctx.cache_path, name)
     ).to(ctx.training_device)
     output_path = Path(dest_path)
 
@@ -94,14 +100,16 @@ def convert_diffusion_stable(
     onnx_export(
         pipeline.text_encoder,
         # casting to torch.int32 until the CLIP fix is released: https://github.com/huggingface/transformers/pull/18515/files
-        model_args=(text_input.input_ids.to(device=ctx.training_device, dtype=torch.int32)),
+        model_args=(
+            text_input.input_ids.to(device=ctx.training_device, dtype=torch.int32)
+        ),
         output_path=output_path / "text_encoder" / "model.onnx",
         ordered_input_names=["input_ids"],
         output_names=["last_hidden_state", "pooler_output"],
         dynamic_axes={
             "input_ids": {0: "batch", 1: "sequence"},
         },
-        opset=opset,
+        opset=ctx.opset,
     )
     del pipeline.text_encoder
 
@@ -113,7 +121,9 @@ def convert_diffusion_stable(
         unet_scale = torch.tensor(4).to(device=ctx.training_device, dtype=torch.int)
     else:
         unet_inputs = ["sample", "timestep", "encoder_hidden_states", "return_dict"]
-        unet_scale = torch.tensor(False).to(device=ctx.training_device, dtype=torch.bool)
+        unet_scale = torch.tensor(False).to(
+            device=ctx.training_device, dtype=torch.bool
+        )
 
     unet_in_channels = pipeline.unet.config.in_channels
     unet_sample_size = pipeline.unet.config.sample_size
@@ -139,7 +149,7 @@ def convert_diffusion_stable(
             "timestep": {0: "batch"},
             "encoder_hidden_states": {0: "batch", 1: "sequence"},
         },
-        opset=opset,
+        opset=ctx.opset,
         use_external_data_format=True,  # UNet is > 2GB, so the weights need to be split
     )
     unet_model_path = str(unet_path.absolute().as_posix())
@@ -182,7 +192,7 @@ def convert_diffusion_stable(
             dynamic_axes={
                 "latent_sample": {0: "batch", 1: "channels", 2: "height", 3: "width"},
             },
-            opset=opset,
+            opset=ctx.opset,
         )
     else:
         # VAE ENCODER
@@ -207,7 +217,7 @@ def convert_diffusion_stable(
             dynamic_axes={
                 "sample": {0: "batch", 1: "channels", 2: "height", 3: "width"},
             },
-            opset=opset,
+            opset=ctx.opset,
         )
 
         # VAE DECODER
@@ -230,7 +240,7 @@ def convert_diffusion_stable(
             dynamic_axes={
                 "latent_sample": {0: "batch", 1: "channels", 2: "height", 3: "width"},
             },
-            opset=opset,
+            opset=ctx.opset,
         )
 
     del pipeline.vae
@@ -261,7 +271,7 @@ def convert_diffusion_stable(
                 "clip_input": {0: "batch", 1: "channels", 2: "height", 3: "width"},
                 "images": {0: "batch", 1: "height", 2: "width", 3: "channels"},
             },
-            opset=opset,
+            opset=ctx.opset,
         )
         del pipeline.safety_checker
         safety_checker = OnnxRuntimeModel.from_pretrained(
@@ -312,4 +322,3 @@ def convert_diffusion_stable(
         )
 
     logger.info("ONNX pipeline is loadable")
-
diff --git a/api/onnx_web/convert/upscale_resrgan.py b/api/onnx_web/convert/upscale_resrgan.py
index 19e6581c..51a95804 100644
--- a/api/onnx_web/convert/upscale_resrgan.py
+++ b/api/onnx_web/convert/upscale_resrgan.py
@@ -1,32 +1,34 @@
-import torch
+from logging import getLogger
+from os import path
 from shutil import copyfile
+
+import torch
+from basicsr.archs.rrdbnet_arch import RRDBNet
 from basicsr.utils.download_util import load_file_from_url
 from torch.onnx import export
-from os import path
-from logging import getLogger
-from basicsr.archs.rrdbnet_arch import RRDBNet
-from .utils import ConversionContext
+
+from .utils import ConversionContext, ModelDict
 
 logger = getLogger(__name__)
 
 
 @torch.no_grad()
-def convert_upscale_resrgan(ctx: ConversionContext, name: str, url: str, scale: int, opset: int):
-    dest_path = path.join(ctx.model_path, name + ".pth")
-    dest_onnx = path.join(ctx.model_path, name + ".onnx")
-    logger.info("converting Real ESRGAN model: %s -> %s", name, dest_onnx)
+def convert_upscale_resrgan(
+    ctx: ConversionContext,
+    model: ModelDict,
+    source: str,
+):
+    name = model.get("name")
+    source = source or model.get("source")
+    scale = model.get("scale")
 
-    if path.isfile(dest_onnx):
+    dest = path.join(ctx.model_path, name + ".onnx")
+    logger.info("converting Real ESRGAN model: %s -> %s", name, dest)
+
+    if path.isfile(dest):
         logger.info("ONNX model already exists, skipping.")
         return
 
-    if not path.isfile(dest_path):
-        logger.info("PTH model not found, downloading...")
-        download_path = load_file_from_url(
-            url=url, model_dir=dest_path + "-cache", progress=True, file_name=None
-        )
-        copyfile(download_path, dest_path)
-
     logger.info("loading and training model")
     model = RRDBNet(
         num_in_ch=3,
@@ -37,7 +39,7 @@ def convert_upscale_resrgan(ctx: ConversionContext, name: str, url: str, scale:
         scale=scale,
     )
 
-    torch_model = torch.load(dest_path, map_location=ctx.map_location)
+    torch_model = torch.load(source, map_location=ctx.map_location)
     if "params_ema" in torch_model:
         model.load_state_dict(torch_model["params_ema"])
     else:
@@ -54,15 +56,15 @@ def convert_upscale_resrgan(ctx: ConversionContext, name: str, url: str, scale:
         "output": {2: "width", 3: "height"},
     }
 
-    logger.info("exporting ONNX model to %s", dest_onnx)
+    logger.info("exporting ONNX model to %s", dest)
     export(
         model,
         rng,
-        dest_onnx,
+        dest,
         input_names=input_names,
         output_names=output_names,
         dynamic_axes=dynamic_axes,
-        opset_version=opset,
+        opset_version=ctx.opset,
         export_params=True,
     )
     logger.info("Real ESRGAN exported to ONNX successfully.")
diff --git a/api/onnx_web/convert/utils.py b/api/onnx_web/convert/utils.py
index 5149c0bd..5a984900 100644
--- a/api/onnx_web/convert/utils.py
+++ b/api/onnx_web/convert/utils.py
@@ -1,7 +1,129 @@
+import shutil
+from functools import partial
+from logging import getLogger
+from os import path
+from pathlib import Path
+from typing import Dict, Union, List, Optional, Tuple
+
+import requests
 import torch
+from tqdm.auto import tqdm
+
+logger = getLogger(__name__)
+
+
+ModelDict = Dict[str, Union[str, int]]
+LegacyModel = Tuple[str, str, Optional[bool], Optional[bool], Optional[int]]
+
 
 class ConversionContext:
-  def __init__(self, model_path: str, device: str) -> None:
-    self.model_path = model_path
-    self.training_device = device
-    self.map_location = torch.device(device)
\ No newline at end of file
+    def __init__(
+        self,
+        model_path: str,
+        device: str,
+        cache_path: Optional[str] = None,
+        half: Optional[bool] = False,
+        opset: Optional[int] = None,
+        token: Optional[str] = None,
+    ) -> None:
+        self.model_path = model_path
+        self.cache_path = cache_path or path.join(model_path, ".cache")
+        self.training_device = device
+        self.map_location = torch.device(device)
+        self.half = half
+        self.opset = opset
+        self.token = token
+
+
+def download_progress(urls: List[Tuple[str, str]]):
+    for url, dest in urls:
+        dest_path = Path(dest).expanduser().resolve()
+        dest_path.parent.mkdir(parents=True, exist_ok=True)
+
+        if dest_path.exists():
+            logger.info("Destination already exists: %s", dest_path)
+            return str(dest_path.absolute())
+
+        req = requests.get(url, stream=True, allow_redirects=True)
+        if req.status_code != 200:
+            req.raise_for_status()  # Only works for 4xx errors, per SO answer
+            raise RuntimeError(
+                "Request to %s failed with status code: %s" % (url, req.status_code)
+            )
+
+        total = int(req.headers.get("Content-Length", 0))
+        desc = "unknown" if total == 0 else ""
+        req.raw.read = partial(req.raw.read, decode_content=True)
+        with tqdm.wrapattr(req.raw, "read", total=total, desc=desc) as data:
+            with dest_path.open("wb") as f:
+                shutil.copyfileobj(data, f)
+
+        return str(dest_path.absolute())
+
+
+def tuple_to_correction(model: Union[ModelDict, LegacyModel]):
+    if isinstance(model, list) or isinstance(model, tuple):
+        name, source, *rest = model
+        scale = rest[0] if len(rest) > 0 else 1
+        half = rest[0] if len(rest) > 0 else False
+        opset = rest[0] if len(rest) > 0 else None
+
+        return {
+            "name": name,
+            "source": source,
+            "half": half,
+            "opset": opset,
+            "scale": scale,
+        }
+    else:
+        return model
+
+
+def tuple_to_diffusion(model: Union[ModelDict, LegacyModel]):
+    if isinstance(model, list) or isinstance(model, tuple):
+        name, source, *rest = model
+        single_vae = rest[0] if len(rest) > 0 else False
+        half = rest[0] if len(rest) > 0 else False
+        opset = rest[0] if len(rest) > 0 else None
+
+        return {
+            "name": name,
+            "source": source,
+            "half": half,
+            "opset": opset,
+            "single_vae": single_vae,
+        }
+    else:
+        return model
+
+
+def tuple_to_upscaling(model: Union[ModelDict, LegacyModel]):
+    if isinstance(model, list) or isinstance(model, tuple):
+        name, source, *rest = model
+        scale = rest[0] if len(rest) > 0 else 1
+        half = rest[0] if len(rest) > 0 else False
+        opset = rest[0] if len(rest) > 0 else None
+
+        return {
+            "name": name,
+            "source": source,
+            "half": half,
+            "opset": opset,
+            "scale": scale,
+        }
+    else:
+        return model
+
+
+known_formats = ["onnx", "pth", "ckpt", "safetensors"]
+
+def source_format(model: Dict) -> Optional[str]:
+    if "format" in model:
+        return model["format"]
+
+    if "source" in model:
+        ext = path.splitext(model["source"])
+        if ext in known_formats:
+            return ext
+
+    return None
diff --git a/api/onnx_web/serve.py b/api/onnx_web/serve.py
index d4490e7a..58eeb1c1 100644
--- a/api/onnx_web/serve.py
+++ b/api/onnx_web/serve.py
@@ -649,10 +649,10 @@ def chain():
         return error_reply("chain pipeline must have a body")
 
     data = yaml.safe_load(body)
-    with open("./schema.yaml", "r") as f:
+    with open("./schemas/chain.yaml", "r") as f:
         schema = yaml.safe_load(f.read())
 
-    logger.info("validating chain request: %s against %s", data, schema)
+    logger.debug("validating chain request: %s against %s", data, schema)
     validate(data, schema)
 
     # get defaults from the regular parameters
diff --git a/api/pyproject.toml b/api/pyproject.toml
index efe56db3..04c7bca4 100644
--- a/api/pyproject.toml
+++ b/api/pyproject.toml
@@ -1,5 +1,5 @@
 [tool.black]
-force-exclude = '''/(lpw_stable_diffusion_onnx|pipeline_onnx_stable_diffusion_upscale).py'''
+force-exclude = '''/(diffusion_original|lpw_stable_diffusion_onnx|pipeline_onnx_stable_diffusion_upscale).py'''
 
 [tool.isort]
 profile = "black"
diff --git a/api/schema.yaml b/api/schemas/chain.yaml
similarity index 94%
rename from api/schema.yaml
rename to api/schemas/chain.yaml
index 98052c82..1b41c503 100644
--- a/api/schema.yaml
+++ b/api/schemas/chain.yaml
@@ -1,4 +1,4 @@
-$id: https://github.com/ssube/onnx-web/blob/main/api/schema.yaml
+$id: https://github.com/ssube/onnx-web/blob/main/api/schemas/chain.yaml
 $schema: https://json-schema.org/draft/2020-12/schema
 
 $defs:
diff --git a/api/schemas/extras.yaml b/api/schemas/extras.yaml
new file mode 100644
index 00000000..56230cc4
--- /dev/null
+++ b/api/schemas/extras.yaml
@@ -0,0 +1,65 @@
+$id: https://github.com/ssube/onnx-web/blob/main/api/schemas/extras.yaml
+$schema: https://json-schema.org/draft/2020-12/schema
+
+$defs:
+  legacy_tuple:
+    type: array
+    items:
+      oneOf:
+        - type: string
+        - type: number
+
+  base_model:
+    type: object
+    required: [name, source]
+    properties:
+      format:
+        type: string
+        enum: [onnx, pth, ckpt, safetensors]
+      half:
+        type: boolean
+      name:
+        type: string
+      opset:
+        type: number
+      source:
+        type: string
+
+  correction_model:
+    allOf:
+      - $ref: "#/$defs/base_model"
+
+  diffusion_model:
+    allOf:
+      - $ref: "#/$defs/base_model"
+
+  upscaling_model:
+    allOf:
+      - $ref: "#/$defs/base_model"
+      - type: object
+        required: [scale]
+        properties:
+          scale:
+            type: number
+
+type: object
+additionalProperties: False
+properties:
+  diffusion:
+    type: array
+    items:
+      oneOf:
+        - $ref: "#/$defs/legacy_tuple"
+        - $ref: "#/$defs/diffusion_model"
+  correction:
+    type: array
+    items:
+      oneOf:
+        - $ref: "#/$defs/legacy_tuple"
+        - $ref: "#/$defs/correction_model"
+  upscaling:
+    type: array
+    items:
+      oneOf:
+        - $ref: "#/$defs/legacy_tuple"
+        - $ref: "#/$defs/upscaling_model"
diff --git a/onnx-web.code-workspace b/onnx-web.code-workspace
index 78337b97..ebd137ae 100644
--- a/onnx-web.code-workspace
+++ b/onnx-web.code-workspace
@@ -58,6 +58,7 @@
 			"rocm",
 			"RRDB",
 			"runwayml",
+			"safetensors",
 			"scandir",
 			"scipy",
 			"scrollback",