diff --git a/CHANGES.md b/CHANGES.md
index 530a0119..8cf47f6d 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [Unreleased]
+
+### Added
+
+* Add base support for the Aggregation extension [#684](https://github.com/stac-utils/stac-fastapi/pull/684)
+
 ## [3.0.0a0] - 2024-05-06
 
 ### Added
diff --git a/stac_fastapi/extensions/stac_fastapi/extensions/core/aggregation/aggregation.py b/stac_fastapi/extensions/stac_fastapi/extensions/core/aggregation/aggregation.py
index 053ef2b5..8bead67d 100644
--- a/stac_fastapi/extensions/stac_fastapi/extensions/core/aggregation/aggregation.py
+++ b/stac_fastapi/extensions/stac_fastapi/extensions/core/aggregation/aggregation.py
@@ -71,25 +71,25 @@ def register(self, app: FastAPI) -> None:
         self.router.add_api_route(
             name="Aggregations",
             path="/aggregations",
-            methods=["GET"],
+            methods=["GET", "POST"],
             endpoint=create_async_endpoint(self.client.get_aggregations, EmptyRequest),
         )
         self.router.add_api_route(
             name="Collection Aggregations",
             path="/collections/{collection_id}/aggregations",
-            methods=["GET"],
+            methods=["GET", "POST"],
             endpoint=create_async_endpoint(self.client.get_aggregations, CollectionUri),
         )
         self.router.add_api_route(
             name="Aggregate",
             path="/aggregate",
-            methods=["GET"],
+            methods=["GET", "POST"],
             endpoint=create_async_endpoint(self.client.aggregate, self.GET),
         )
         self.router.add_api_route(
             name="Collection Aggregate",
             path="/collections/{collection_id}/aggregate",
-            methods=["GET"],
+            methods=["GET", "POST"],
             endpoint=create_async_endpoint(self.client.aggregate, self.GET),
         )
         app.include_router(self.router, tags=["Aggregation Extension"])
diff --git a/stac_fastapi/types/stac_fastapi/types/core.py b/stac_fastapi/types/stac_fastapi/types/core.py
index ddaafb6b..86712248 100644
--- a/stac_fastapi/types/stac_fastapi/types/core.py
+++ b/stac_fastapi/types/stac_fastapi/types/core.py
@@ -402,7 +402,7 @@ def landing_page(self, **kwargs) -> stac.LandingPage:
                         "method": "GET",
                     },
                     {
-                        "rel": "aggregation",
+                        "rel": "aggregations",
                         "type": "application/json",
                         "title": "Aggregations",
                         "href": urljoin(base_url, "aggregations"),