diff --git a/cads_catalogue_api_service/client.py b/cads_catalogue_api_service/client.py
index 1c652f1..b47878e 100644
--- a/cads_catalogue_api_service/client.py
+++ b/cads_catalogue_api_service/client.py
@@ -474,7 +474,7 @@ def load_catalogue(
         """Return the whole catalogue as a serialized structure."""
         query = session.query(self.collection_table).options(*database.deferred_columns)
         query_results = search_utils.apply_filters(
-            session, query, q, None, portals=portals
+            session, query, q, kw=None, idx=None, portals=portals
         ).all()
         all_collections = [
             collection_serializer(
@@ -489,6 +489,7 @@ def all_datasets(
         request: fastapi.Request,
         q: str | None = None,
         kw: list[str] | None = [],
+        idx: list[str] | None = [],
         sortby: extensions.CatalogueSortCriterion = extensions.CatalogueSortCriterion.update_desc,
         page: int = 0,
         limit: int = 999,
@@ -507,7 +508,9 @@ def all_datasets(
             search = session.query(self.collection_table).options(
                 *database.deferred_columns
             )
-            search = search_utils.apply_filters(session, search, q, kw, portals=portals)
+            search = search_utils.apply_filters(
+                session, search, q, kw, idx, portals=portals
+            )
             count = search.count()
             search = apply_sorting_and_limit(
                 search=search, q=q, sortby=sortby, page=page, limit=limit
diff --git a/cads_catalogue_api_service/extensions.py b/cads_catalogue_api_service/extensions.py
index 7d1fb25..1fa5607 100644
--- a/cads_catalogue_api_service/extensions.py
+++ b/cads_catalogue_api_service/extensions.py
@@ -19,6 +19,7 @@
 
 import attr
 import fastapi
+import pydantic
 import stac_fastapi.api
 import stac_fastapi.types.extension
 
@@ -38,6 +39,9 @@ def datasets_search(
     kw: list[str] | None = fastapi.Query(
         default=[], description="Filter by keyword(s)"
     ),
+    idx: list[str] | None = fastapi.Query(
+        default=[], description="Filter by dataset IDs"
+    ),
     sortby: CatalogueSortCriterion = fastapi.Query(
         default=CatalogueSortCriterion.update_desc
     ),
@@ -53,6 +57,7 @@ def datasets_search(
         request=request,
         q=q,
         kw=kw,
+        idx=idx,
         sortby=sortby,
         page=page,
         limit=limit,
@@ -61,6 +66,32 @@ def datasets_search(
     )
 
 
+class FormData(pydantic.BaseModel):
+    """Search datasets valid payload."""
+
+    q: str = ""
+    kw: list[str] | None = []
+    idx: list[str] | None = []
+    sortby: CatalogueSortCriterion = CatalogueSortCriterion.update_desc
+    page: int = 0
+    limit: int = config.MAX_LIMIT
+    search_stats: bool = True
+
+
+def datasets_search_post(request: fastapi.Request, data: FormData) -> dict[str, Any]:
+    """Filter datasets based on search parameters."""
+    return datasets_search(
+        request=request,
+        q=data.q,
+        kw=data.kw,
+        idx=data.idx,
+        sortby=data.sortby,
+        page=data.page,
+        limit=data.limit,
+        search_stats=data.search_stats,
+    )
+
+
 @attr.s
 class DatasetsSearchExtension(stac_fastapi.types.extension.ApiExtension):
     """Datasets filter extension.
@@ -96,13 +127,14 @@ def register(self, app: fastapi.FastAPI) -> None:
             name="Datasets Search",
             path="/datasets",
             methods=["GET"],
-            # endpoint=stac_fastapi.api.routes.create_async_endpoint(
-            #     datasets_search,
-            #     stac_fastapi.api.models.EmptyRequest,
-            #     self.response_class,
-            # ),
             endpoint=datasets_search,
         )
+        self.router.add_api_route(
+            name="Datasets Search",
+            path="/datasets",
+            methods=["POST"],
+            endpoint=datasets_search_post,
+        )
         app.include_router(self.router, tags=["Datasets Search Extension"])
 
 
diff --git a/cads_catalogue_api_service/search_utils.py b/cads_catalogue_api_service/search_utils.py
index b30a61f..a263c8a 100644
--- a/cads_catalogue_api_service/search_utils.py
+++ b/cads_catalogue_api_service/search_utils.py
@@ -81,6 +81,7 @@ def apply_filters(
     search: sa.orm.Query,
     q: str | None,
     kw: list | None,
+    idx: list | None,
     portals: list[str] | None = None,
 ):
     """Apply allowed search filters to the running query.
@@ -99,6 +100,9 @@ def apply_filters(
     if portals:
         search = search.filter(cads_catalogue.database.Resource.portal.in_(portals))
 
+    if idx:
+        search = search.filter(cads_catalogue.database.Resource.resource_uid.in_(idx))
+
     # Faceted search
     if kw:
         # Facetes search criteria is to run on OR in the same category, and AND between categories
diff --git a/environment.yml b/environment.yml
index b73a53d..dee0d4d 100644
--- a/environment.yml
+++ b/environment.yml
@@ -10,7 +10,7 @@ channels:
 dependencies:
 - attrs
 - brotli-asgi
-- fastapi>=0.93.0
+- fastapi>=0.113.0
 - httpx
 - pip
 - pydantic<2
diff --git a/pyproject.toml b/pyproject.toml
index 742a01a..875e6e3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
   "attrs",
   "cads-catalogue@git+https://github.com/ecmwf-projects/cads-catalogue.git",
   "cads-common@git+https://github.com/ecmwf-projects/cads-common.git",
-  "fastapi",
+  "fastapi>=0.113.0",
   "python-dateutil",
   "sqlalchemy>=2.0.9",
   "stac_fastapi.api",