diff --git a/aqua/trust-graph-api.aqua b/aqua/trust-graph-api.aqua
index 1efb3c5..c92eaeb 100644
--- a/aqua/trust-graph-api.aqua
+++ b/aqua/trust-graph-api.aqua
@@ -16,3 +16,20 @@ func verify_trust(node: string, trust: Trust, issuer_peer_id: string) -> VerifyT
         timestamp_sec <- Peer.timestamp_sec()
         result <- TrustGraph.verify_trust(trust, issuer_peer_id, timestamp_sec)
     <- result
+
+func add_trust(node: string, trust: Trust, issuer_peer_id: string) -> AddTrustResult:
+    on node:
+        timestamp_sec <- Peer.timestamp_sec()
+        result <- TrustGraph.add_trust(trust, issuer_peer_id, timestamp_sec)
+    <- result
+
+func add_root(node: string, peer_id: string, weight: u32) -> AddRootResult:
+    on node:
+        result <- TrustGraph.add_root(peer_id, weight)
+    <- result
+
+func get_weight(node: string, peer_id: string) -> WeightResult:
+    on node:
+        timestamp_sec <- Peer.timestamp_sec()
+        result <- TrustGraph.get_weight(peer_id, timestamp_sec)
+    <- result
diff --git a/example/aqua/export.aqua b/example/aqua/export.aqua
index 43404ef..8a4969f 100644
--- a/example/aqua/export.aqua
+++ b/example/aqua/export.aqua
@@ -1,3 +1,3 @@
-import get_trust_metadata, issue_trust, verify_trust from "../../aqua/trust-graph-api.aqua"
+import get_trust_metadata, issue_trust, verify_trust, add_trust, add_root, get_weight from "../../aqua/trust-graph-api.aqua"
 
-export get_trust_metadata, issue_trust, verify_trust
+export get_trust_metadata, issue_trust, verify_trust, add_trust, add_root, get_weight
diff --git a/example/index.ts b/example/index.ts
index ceae1eb..a780238 100644
--- a/example/index.ts
+++ b/example/index.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { get_trust_metadata, issue_trust, verify_trust } from "./generated/export";
+import { get_trust_metadata, issue_trust, verify_trust, add_trust, add_root, get_weight } from "./generated/export";
 import { Fluence, KeyPair } from "@fluencelabs/fluence";
 import { Node } from "@fluencelabs/fluence-network-environment";
 const bs58 = require('bs58');
@@ -33,22 +33,35 @@ let local: Node[] = [
 ];
 
 async function main(environment: Node[]) {
-    await Fluence.start({ connectTo: environment[0] });
+    let builtins_keypair = await KeyPair.fromBytes(bs58.decode("5CGiJio6m76GxJ2wLj46PzSu6V7SRa5agv6meR3SJBKtvTgethRCmgBJKXWDSpSEBpgNUPd7Re5cZjF8mWW4kBfs"));
+    await Fluence.start({ connectTo: environment[0], KeyPair: builtins_keypair});
     console.log(
         "📗 created a fluence peer %s with relay %s",
         Fluence.getStatus().peerId,
         Fluence.getStatus().relayPeerId
     );
 
-
-    let trust_metadata = await get_trust_metadata(local[0].peerId, local[1].peerId, 99999999999, 0);
     const issuer_kp = await KeyPair.fromBytes(bs58.decode("29Apzfedhw2Jxh94Jj4rNSmavQ1TkNe8ALYRA7bMegobwp423aLrURxLk32WtXgXHDqoSz7GAT9fQfoMhVd1e5Ww"));
     console.log("Issuer peer id: %", issuer_kp.Libp2pPeerId.toB58String());
+
+    let add_root_result = await add_root(local[0].peerId, local[0].peerId, 2);
+    console.log("Add root weight result: %s", add_root_result);
+
+    let trust_metadata = await get_trust_metadata(local[0].peerId, local[0].peerId, 99999999999, 0);
     const signed_metadata = await issuer_kp.Libp2pPeerId.privKey.sign(Uint8Array.from(trust_metadata.result));
-    let trust = await issue_trust(local[0].peerId, local[1].peerId, 99999999999, 0, Array.from(signed_metadata));
-    console.log("Trust %s", trust.trust);
-    let result = await verify_trust(local[0].peerId, trust.trust, local[0].peerId);
-    console.log("Verify trust result: %s", result);
+
+    let root_trust = await issue_trust(local[0].peerId, local[0].peerId, 99999999999, 0, Array.from(signed_metadata));
+    console.log("Root trust %s", root_trust.trust);
+
+    let result = await verify_trust(local[0].peerId, root_trust.trust, local[0].peerId);
+    console.log("Verify root trust result: %s", result);
+
+    let result_add = await add_trust(local[0].peerId, root_trust.trust, local[0].peerId);
+    console.log("Add root trust result: %s", result_add);
+
+    let root_weight_result = await get_weight(local[0].peerId, local[0].peerId);
+    console.log("Root weight: %s", root_weight_result);
+
     return;
 }
 
diff --git a/service/src/service_api.rs b/service/src/service_api.rs
index 7a053a2..4caf4cd 100644
--- a/service/src/service_api.rs
+++ b/service/src/service_api.rs
@@ -39,15 +39,16 @@ fn get_all_certs(issued_for: String, timestamp_sec: u64) -> AllCertsResult {
 
 #[marine]
 /// could add only a host of a trust graph service
+// TODO: rename to add_root_weight_factor
 fn add_root(peer_id: String, weight: u32) -> AddRootResult {
     let call_parameters: CallParameters = marine_rs_sdk::get_call_parameters();
     let init_peer_id = call_parameters.init_peer_id.clone();
-    if call_parameters.host_id == init_peer_id {
+    if call_parameters.service_creator_peer_id == init_peer_id {
         add_root_impl(peer_id, weight).into()
     } else {
         return AddRootResult {
             success: false,
-            error: "Root could add only a host of trust graph service".to_string(),
+            error: "Root could add only by trust graph service owner".to_string(),
         };
     }
 }