diff --git a/src/frostfs_testlib/cli/frostfs_cli/object.py b/src/frostfs_testlib/cli/frostfs_cli/object.py
index 0c00563..e536544 100644
--- a/src/frostfs_testlib/cli/frostfs_cli/object.py
+++ b/src/frostfs_testlib/cli/frostfs_cli/object.py
@@ -315,8 +315,9 @@ class FrostfsCliObject(CliCommand):
             ttl: TTL value in request meta header (default 2)
             wallet: WIF (NEP-2) string or path to the wallet or binary key
             xhdr: Dict with request X-Headers
+
         Returns:
-            (str): ID of patched Object
+            Command's result.
         """
         return self._execute(
             "object patch",
diff --git a/src/frostfs_testlib/clients/s3/s3_http_client.py b/src/frostfs_testlib/clients/s3/s3_http_client.py
index b83e7a8..f6f423d 100644
--- a/src/frostfs_testlib/clients/s3/s3_http_client.py
+++ b/src/frostfs_testlib/clients/s3/s3_http_client.py
@@ -21,12 +21,16 @@ class S3HttpClient:
         self, s3gate_endpoint: str, access_key_id: str, secret_access_key: str, profile: str = "default", region: str = "us-east-1"
     ) -> None:
         self.http_client = HttpClient()
-        self.s3gate_endpoint = s3gate_endpoint
         self.credentials = Credentials(access_key_id, secret_access_key)
         self.profile = profile
         self.region = region
-        self.service = "s3"
-        self.signature = SigV4Auth(self.credentials, self.service, self.region)
+
+        self.iam_endpoint: str = None
+        self.s3gate_endpoint: str = None
+        self.service: str = None
+        self.signature: SigV4Auth = None
+
+        self.set_endpoint(s3gate_endpoint)
 
     def _to_s3_header(self, header: str) -> dict:
         replacement_map = {
@@ -104,6 +108,24 @@ class S3HttpClient:
 
         return data
 
+    @reporter.step("Set endpoint S3 to {s3gate_endpoint}")
+    def set_endpoint(self, s3gate_endpoint: str):
+        if self.s3gate_endpoint == s3gate_endpoint:
+            return
+
+        self.s3gate_endpoint = s3gate_endpoint
+        self.service = "s3"
+        self.signature = SigV4Auth(self.credentials, self.service, self.region)
+
+    @reporter.step("Set endpoint IAM to {iam_endpoint}")
+    def set_iam_endpoint(self, iam_endpoint: str):
+        if self.iam_endpoint == iam_endpoint:
+            return
+
+        self.iam_endpoint = iam_endpoint
+        self.service = "iam"
+        self.signature = SigV4Auth(self.credentials, self.service, self.region)
+
     @reporter.step("Patch object S3")
     def patch_object(
         self,
diff --git a/src/frostfs_testlib/storage/dataclasses/ape.py b/src/frostfs_testlib/storage/dataclasses/ape.py
index b7b5dfc..1199435 100644
--- a/src/frostfs_testlib/storage/dataclasses/ape.py
+++ b/src/frostfs_testlib/storage/dataclasses/ape.py
@@ -52,6 +52,7 @@ class Operations:
     SEARCH_OBJECT = "SearchObject"
     HEAD_OBJECT = "HeadObject"
     PUT_OBJECT = "PutObject"
+    PATCH_OBJECT = "PatchObject"
 
 
 class Verb(HumanReadableEnum):