diff --git a/CHANGES.md b/CHANGES.md
index ea020992..6f2106eb 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,13 +2,23 @@
 
 ## [Unreleased] - TBD
 
+### Added
+
+* Add attributes to `stac_fastapi.api.app.StacApi` to enable customization of request model for:
+  - `/collections`: **collections_get_request_model**, default to `EmptyRequest`
+  - `/collections/{collection_id}`: **collection_get_request_model**, default to `CollectionUri`
+  - `/collections/{collection_id}/items`: **items_get_request_model**, default to `ItemCollectionUri`
+  - `/collections/{collection_id}/items/{item_id}`: **item_get_request_model**, default to `ItemUri`
+
 ### Fixed
 
 * Updated default filter language in filter extension's POST search request model to match the extension's documentation [#711](https://github.com/stac-utils/stac-fastapi/issues/711)
 
 ### Removed
 
-* Removed the Filter Extension depenency from `AggregationExtensionPostRequest` and `AggregationExtensionGetRequest` [#716](https://github.com/stac-utils/stac-fastapi/pull/716)
+* Removed the Filter Extension dependency from `AggregationExtensionPostRequest` and `AggregationExtensionGetRequest` [#716](https://github.com/stac-utils/stac-fastapi/pull/716)
+* `pagination_extension` attribute in `stac_fastapi.api.app.StacApi`
+* remove use of `pagination_extension` in `register_get_item_collection` function (User now need to construct the request model and pass it using `items_get_request_model` attribute)
 
 ## [3.0.0a3] - 2024-06-13
 
diff --git a/stac_fastapi/api/stac_fastapi/api/app.py b/stac_fastapi/api/stac_fastapi/api/app.py
index 5fe7f9d0..aa4a0cc0 100644
--- a/stac_fastapi/api/stac_fastapi/api/app.py
+++ b/stac_fastapi/api/stac_fastapi/api/app.py
@@ -18,18 +18,18 @@
 from stac_fastapi.api.errors import DEFAULT_STATUS_CODES, add_exception_handlers
 from stac_fastapi.api.middleware import CORSMiddleware, ProxyHeaderMiddleware
 from stac_fastapi.api.models import (
+    APIRequest,
     CollectionUri,
     EmptyRequest,
     GeoJSONResponse,
     ItemCollectionUri,
     ItemUri,
-    create_request_model,
 )
 from stac_fastapi.api.openapi import update_openapi
 from stac_fastapi.api.routes import Scope, add_route_dependencies, create_async_endpoint
 
 # TODO: make this module not depend on `stac_fastapi.extensions`
-from stac_fastapi.extensions.core import FieldsExtension, TokenPaginationExtension
+from stac_fastapi.extensions.core import FieldsExtension
 from stac_fastapi.types.config import ApiSettings, Settings
 from stac_fastapi.types.core import AsyncBaseCoreClient, BaseCoreClient
 from stac_fastapi.types.extension import ApiExtension
@@ -108,7 +108,10 @@ class StacApi:
     search_post_request_model: Type[BaseSearchPostRequest] = attr.ib(
         default=BaseSearchPostRequest
     )
-    pagination_extension = attr.ib(default=TokenPaginationExtension)
+    collections_get_request_model: Type[APIRequest] = attr.ib(default=EmptyRequest)
+    collection_get_request_model: Type[APIRequest] = attr.ib(default=CollectionUri)
+    items_get_request_model: Type[APIRequest] = attr.ib(default=ItemCollectionUri)
+    item_get_request_model: Type[APIRequest] = attr.ib(default=ItemUri)
     response_class: Type[Response] = attr.ib(default=JSONResponse)
     middlewares: List[Middleware] = attr.ib(
         default=attr.Factory(
@@ -211,7 +214,9 @@ def register_get_item(self):
             response_model_exclude_unset=True,
             response_model_exclude_none=True,
             methods=["GET"],
-            endpoint=create_async_endpoint(self.client.get_item, ItemUri),
+            endpoint=create_async_endpoint(
+                self.client.get_item, self.item_get_request_model
+            ),
         )
 
     def register_post_search(self):
@@ -302,7 +307,9 @@ def register_get_collections(self):
             response_model_exclude_unset=True,
             response_model_exclude_none=True,
             methods=["GET"],
-            endpoint=create_async_endpoint(self.client.all_collections, EmptyRequest),
+            endpoint=create_async_endpoint(
+                self.client.all_collections, self.collections_get_request_model
+            ),
         )
 
     def register_get_collection(self):
@@ -329,7 +336,9 @@ def register_get_collection(self):
             response_model_exclude_unset=True,
             response_model_exclude_none=True,
             methods=["GET"],
-            endpoint=create_async_endpoint(self.client.get_collection, CollectionUri),
+            endpoint=create_async_endpoint(
+                self.client.get_collection, self.collection_get_request_model
+            ),
         )
 
     def register_get_item_collection(self):
@@ -338,16 +347,6 @@ def register_get_item_collection(self):
         Returns:
             None
         """
-        pagination_extension = self.get_extension(self.pagination_extension)
-        if pagination_extension is not None:
-            mixins = [pagination_extension.GET]
-        else:
-            mixins = None
-        request_model = create_request_model(
-            "ItemCollectionURI",
-            base_model=ItemCollectionUri,
-            mixins=mixins,
-        )
         self.router.add_api_route(
             name="Get ItemCollection",
             path="/collections/{collection_id}/items",
@@ -366,7 +365,9 @@ def register_get_item_collection(self):
             response_model_exclude_unset=True,
             response_model_exclude_none=True,
             methods=["GET"],
-            endpoint=create_async_endpoint(self.client.item_collection, request_model),
+            endpoint=create_async_endpoint(
+                self.client.item_collection, self.items_get_request_model
+            ),
         )
 
     def register_core(self):
diff --git a/stac_fastapi/api/tests/test_api.py b/stac_fastapi/api/tests/test_api.py
index d559a377..7db4d9a5 100644
--- a/stac_fastapi/api/tests/test_api.py
+++ b/stac_fastapi/api/tests/test_api.py
@@ -2,6 +2,7 @@
 from starlette.testclient import TestClient
 
 from stac_fastapi.api.app import StacApi
+from stac_fastapi.api.models import ItemCollectionUri, create_request_model
 from stac_fastapi.extensions.core import (
     TokenPaginationExtension,
     TransactionExtension,
@@ -13,6 +14,13 @@ class TestRouteDependencies:
     @staticmethod
     def _build_api(**overrides):
         settings = config.ApiSettings()
+
+        items_get_request_model = create_request_model(
+            "ItemCollectionURI",
+            base_model=ItemCollectionUri,
+            mixins=[TokenPaginationExtension().GET],
+        )
+
         return StacApi(
             **{
                 "settings": settings,
@@ -23,6 +31,7 @@ def _build_api(**overrides):
                     ),
                     TokenPaginationExtension(),
                 ],
+                "items_get_request_model": items_get_request_model,
                 **overrides,
             }
         )
diff --git a/stac_fastapi/api/tests/test_app.py b/stac_fastapi/api/tests/test_app.py
index 829982b5..64695de8 100644
--- a/stac_fastapi/api/tests/test_app.py
+++ b/stac_fastapi/api/tests/test_app.py
@@ -1,13 +1,19 @@
+from dataclasses import dataclass
 from datetime import datetime
 from typing import List, Optional, Union
 
 import pytest
+from fastapi import Path, Query
 from fastapi.testclient import TestClient
 from pydantic import ValidationError
 from stac_pydantic import api
 
 from stac_fastapi.api import app
-from stac_fastapi.api.models import create_get_request_model, create_post_request_model
+from stac_fastapi.api.models import (
+    APIRequest,
+    create_get_request_model,
+    create_post_request_model,
+)
 from stac_fastapi.extensions.core import FieldsExtension, FilterExtension
 from stac_fastapi.types import stac
 from stac_fastapi.types.config import ApiSettings
@@ -294,3 +300,64 @@ def item_collection(
     else:
         assert get_search.status_code == 200, get_search.text
         assert post_search.status_code == 200, post_search.text
+
+
+def test_request_model(AsyncTestCoreClient):
+    """Test if request models are passed correctly."""
+
+    @dataclass
+    class CollectionsRequest(APIRequest):
+        user: str = Query(...)
+
+    @dataclass
+    class CollectionRequest(APIRequest):
+        collection_id: str = Path(description="Collection ID")
+        user: str = Query(...)
+
+    @dataclass
+    class ItemsRequest(APIRequest):
+        collection_id: str = Path(description="Collection ID")
+        user: str = Query(...)
+
+    @dataclass
+    class ItemRequest(APIRequest):
+        collection_id: str = Path(description="Collection ID")
+        item_id: str = Path(description="Item ID")
+        user: str = Query(...)
+
+    test_app = app.StacApi(
+        settings=ApiSettings(),
+        client=AsyncTestCoreClient(),
+        collections_get_request_model=CollectionsRequest,
+        collection_get_request_model=CollectionRequest,
+        items_get_request_model=ItemsRequest,
+        item_get_request_model=ItemRequest,
+        extensions=[],
+    )
+
+    with TestClient(test_app.app) as client:
+        resp = client.get("/collections")
+        assert resp.status_code == 400
+
+        resp = client.get("/collections", params={"user": "luke"})
+        assert resp.status_code == 200
+
+        resp = client.get("/collections/test_collection")
+        assert resp.status_code == 400
+
+        resp = client.get("/collections/test_collection", params={"user": "luke"})
+        assert resp.status_code == 200
+
+        resp = client.get("/collections/test_collection/items")
+        assert resp.status_code == 400
+
+        resp = client.get("/collections/test_collection/items", params={"user": "luke"})
+        assert resp.status_code == 200
+
+        resp = client.get("/collections/test_collection/items/test_item")
+        assert resp.status_code == 400
+
+        resp = client.get(
+            "/collections/test_collection/items/test_item", params={"user": "luke"}
+        )
+        assert resp.status_code == 200