diff --git a/eodag/resources/providers.yml b/eodag/resources/providers.yml
index 044de6b35..c3af8f28e 100644
--- a/eodag/resources/providers.yml
+++ b/eodag/resources/providers.yml
@@ -839,6 +839,8 @@
 
       # Additional metadata provided by the providers but that don't appear in the reference spec
       thumbnail: '$.properties.thumbnail'
+      links: $.null
+      services: $.null
   products:
     S1_SAR_OCN:
       productType: OCN
diff --git a/eodag/rest/stac.py b/eodag/rest/stac.py
index cddcbd1ff..f6146dc57 100644
--- a/eodag/rest/stac.py
+++ b/eodag/rest/stac.py
@@ -29,6 +29,7 @@
 import shapefile
 from dateutil import tz
 from dateutil.relativedelta import relativedelta
+from jsonpath_ng.jsonpath import Child
 from shapely.geometry import shape
 from shapely.geometry.base import BaseGeometry
 from shapely.ops import unary_union
@@ -68,6 +69,36 @@
 
 STAC_CATALOGS_PREFIX = "catalogs"
 
+# fields not to put in item properties
+COLLECTION_PROPERTIES = [
+    "abstract",
+    "instrument",
+    "platform",
+    "platformSerialIdentifier",
+    "processingLevel",
+    "sensorType",
+    "md5",
+    "license",
+    "title",
+    "missionStartDate",
+    "missionEndDate",
+    "keywords",
+    "stacCollection",
+]
+IGNORED_ITEM_PROPERTIES = [
+    "_id",
+    "id",
+    "keyword",
+    "quicklook",
+    "thumbnail",
+    "downloadLink",
+    "orderLink",
+    "_dc_qs",
+    "qs",
+    "defaultGeometry",
+    "_date",
+]
+
 
 class StacCommon:
     """Stac common object
@@ -248,6 +279,13 @@ def __get_item_list(
                         k, item_model["properties"][k]
                     )
 
+        item_props = [
+            p.right.fields[0]
+            for p in item_model["properties"].values()
+            if isinstance(p, Child)
+        ]
+        ignored_props = COLLECTION_PROPERTIES + item_props + IGNORED_ITEM_PROPERTIES
+
         item_list: List[Dict[str, Any]] = []
         for product in search_results:
             product_dict = deepcopy(product.__dict__)
@@ -259,6 +297,17 @@ def __get_item_list(
                     "providers": [self.get_provider_dict(product.provider)],
                 },
             )
+
+            # add additional item props
+            for p in set(product.properties) - set(ignored_props):
+                prefix = getattr(
+                    self.eodag_api.providers_config[product.provider],
+                    "group",
+                    product.provider,
+                )
+                key = p if ":" in p else f"{prefix}:{p}"
+                product_item["properties"][key] = product.properties[p]
+
             # parse download link
             downloadlink_href = (
                 f"{catalog['url']}/items/{product.properties['title']}/download"
@@ -716,7 +765,11 @@ def __generate_stac_collection(
                 )
             except TypeError as e:
                 logger.warning(
-                    f"Could not merge keywords from external collection for {product_type}: {str(e)}"
+                    f"Could not merge keywords from external collection for {product_type['ID']}: {str(e)}"
+                )
+                logger.debug(
+                    f"External collection keywords: {str(ext_stac_collection['keywords'])}, ",
+                    f"Product type keywords: {str(product_type_collection['keywords'])}",
                 )
 
         # merge providers
diff --git a/tests/units/test_http_server.py b/tests/units/test_http_server.py
index 92664e983..8ff5bd421 100644
--- a/tests/units/test_http_server.py
+++ b/tests/units/test_http_server.py
@@ -223,6 +223,7 @@ def mock_search_result(self):
                             "sensorMode": None,
                             "quicklook": None,
                             "storageStatus": ONLINE_STATUS,
+                            "providerProperty": "foo",
                         },
                         "id": "578f1768-e66e-5b86-9363-b19f8931cc7b",
                         "type": "Feature",
@@ -826,6 +827,9 @@ def test_date_search_from_catalog_items_with_provider(self):
                 self_link = link
         self.assertIsNotNone(self_link)
         self.assertIn("?provider=peps", self_link["href"])
+        self.assertEqual(
+            results["features"][0]["properties"]["peps:providerProperty"], "foo"
+        )
 
     def test_search_item_id_from_catalog(self):
         """Search by id through eodag server /catalog endpoint should return a valid response"""