diff --git a/packages/packages.json b/packages/packages.json
index da717896..6eb149af 100644
--- a/packages/packages.json
+++ b/packages/packages.json
@@ -2,18 +2,18 @@
     "dev": {
         "connection/valory/websocket_client/0.1.0": "bafybeiflmystocxaqblhpzqlcop2vkhsknpzjx2jomohomaxamwskeokzm",
         "skill/valory/contract_subscription/0.1.0": "bafybeicyugrkx5glat4p4ezwf6i7oduh26eycfie6ftd4uxrknztzl3ik4",
-        "agent/valory/mech/0.1.0": "bafybeia4hfn4yvcpirwfhyk6uq7v7mwxqoawxi5dvhudc2x5wpqzfklyle",
-        "skill/valory/mech_abci/0.1.0": "bafybeihriybbmuepuiz44f4wgi6tcdzgw4avhgxibpmpztqzs7ys6adkqu",
-        "contract/valory/agent_mech/0.1.0": "bafybeih6fyszhp5kloosiqnmim2l4kgj7g6cetbe5fwvzojahm34smjvhu",
-        "service/valory/mech/0.1.0": "bafybeiaxjikctwp77axs3oqhpsp7w4lamp7nq7femo2ch7ffsgqjweydte",
+        "agent/valory/mech/0.1.0": "bafybeiflfz2kcy2adgjtx3ad47u5axbkjjcej56xladjkoa3i4ufpqdyua",
+        "skill/valory/mech_abci/0.1.0": "bafybeiaex75imhmpgherc2n5ycjfctecyphu6rgia4wgwfnpwklrfvs6e4",
+        "contract/valory/agent_mech/0.1.0": "bafybeig7zpqhcpt6z4eutedx6prciuq4g7mpadw636zkkcx3ach6oytdry",
+        "service/valory/mech/0.1.0": "bafybeicgxvwznlahv6yk2lyz23x4di6px2r5o2ot7v3dxztwclqghfxs5a",
         "protocol/valory/acn_data_share/0.1.0": "bafybeih5ydonnvrwvy2ygfqgfabkr47s4yw3uqxztmwyfprulwfsoe7ipq",
-        "skill/valory/task_submission_abci/0.1.0": "bafybeideyqmjbn5ipk6kdiaq6fdh7se4vsgzmpzncapb4hkqb7awjodzki",
-        "skill/valory/task_execution/0.1.0": "bafybeiazisnaig7sswkcrjga5runappjwmk4va2gvbhj4w4456auoduspu",
+        "skill/valory/task_submission_abci/0.1.0": "bafybeifb3vw25nlz2tecbpsbzrynwva2ey4r624htty62rjg6lrqwmh6l4",
+        "skill/valory/task_execution/0.1.0": "bafybeidld3hvlu6b54kkmaykiahu37oyb4l3f725tldjfpmxuuiiokv6ua",
         "contract/valory/agent_registry/0.1.0": "bafybeiargayav6yiztdnwzejoejstcx4idssch2h4f5arlgtzj3tgsgfmu",
         "protocol/valory/websocket_client/0.1.0": "bafybeih43mnztdv3v2hetr2k3gezg7d3yj4ur7cxdvcyaqhg65e52s5sf4",
         "skill/valory/websocket_client/0.1.0": "bafybeidwntmkk4b2ixq5454ycbkknclqx7a6vpn7aqpm2nw3duszqrxvta",
         "contract/valory/hash_checkpoint/0.1.0": "bafybeieys27hidb5m267jwqsxdgorf5v37o6lvrfy2oga557stjn4xgoaa",
-        "skill/valory/subscription_abci/0.1.0": "bafybeiadm75c5bytop2zqyftstl53ggtocc4gassbpqiq3ybtpumar3pye"
+        "skill/valory/subscription_abci/0.1.0": "bafybeibgnw53s5nh6up35z6fgjisrrvrlt4nnjmx3ia7fcgwpmcprvja5u"
     },
     "third_party": {
         "skill/valory/transaction_settlement_abci/0.1.0": "bafybeiaefgqbs7zsn5xe5kdwrujj7ivygkn3ujpw6crnvi3knvxw75qmja",
diff --git a/packages/valory/agents/mech/aea-config.yaml b/packages/valory/agents/mech/aea-config.yaml
index 87f6b874..0db54da2 100644
--- a/packages/valory/agents/mech/aea-config.yaml
+++ b/packages/valory/agents/mech/aea-config.yaml
@@ -15,7 +15,7 @@ connections:
 - valory/p2p_libp2p_client:0.1.0:bafybeihge56dn3xep2dzomu7rtvbgo4uc2qqh7ljl3fubqdi2lq44gs5lq
 - valory/websocket_client:0.1.0:bafybeiflmystocxaqblhpzqlcop2vkhsknpzjx2jomohomaxamwskeokzm
 contracts:
-- valory/agent_mech:0.1.0:bafybeih6fyszhp5kloosiqnmim2l4kgj7g6cetbe5fwvzojahm34smjvhu
+- valory/agent_mech:0.1.0:bafybeig7zpqhcpt6z4eutedx6prciuq4g7mpadw636zkkcx3ach6oytdry
 - valory/agent_registry:0.1.0:bafybeiargayav6yiztdnwzejoejstcx4idssch2h4f5arlgtzj3tgsgfmu
 - valory/gnosis_safe:0.1.0:bafybeidll7frtdsq2ckiluazkwk4zpkp7natt4kdejjehwvykqwzyuf6ei
 - valory/gnosis_safe_proxy_factory:0.1.0:bafybeidvcgnbbmjtha6tl7st2ysna2l3iiqfhnzjfasyvml5unecozeeka
@@ -38,12 +38,12 @@ skills:
 - valory/abstract_abci:0.1.0:bafybeiflcfufixmsrhobf56bn5745m2iipcfqyulwk2qegtnagb3kvaaxi
 - valory/abstract_round_abci:0.1.0:bafybeiaqcl7h2famylusiffigwem7tevkcsyocdu5xd42jkmgq6kvowzgq
 - valory/contract_subscription:0.1.0:bafybeicyugrkx5glat4p4ezwf6i7oduh26eycfie6ftd4uxrknztzl3ik4
-- valory/mech_abci:0.1.0:bafybeihriybbmuepuiz44f4wgi6tcdzgw4avhgxibpmpztqzs7ys6adkqu
+- valory/mech_abci:0.1.0:bafybeiaex75imhmpgherc2n5ycjfctecyphu6rgia4wgwfnpwklrfvs6e4
 - valory/registration_abci:0.1.0:bafybeic2ynseiak7jpta7jfwuqwyp453b4p7lolr4wihxmpn633uekv5am
 - valory/reset_pause_abci:0.1.0:bafybeidzajbe3erygeh2xbd6lrjv7nsptznjuzrt24ykgvhgotdeyhfnba
-- valory/subscription_abci:0.1.0:bafybeiadm75c5bytop2zqyftstl53ggtocc4gassbpqiq3ybtpumar3pye
-- valory/task_execution:0.1.0:bafybeiazisnaig7sswkcrjga5runappjwmk4va2gvbhj4w4456auoduspu
-- valory/task_submission_abci:0.1.0:bafybeideyqmjbn5ipk6kdiaq6fdh7se4vsgzmpzncapb4hkqb7awjodzki
+- valory/subscription_abci:0.1.0:bafybeibgnw53s5nh6up35z6fgjisrrvrlt4nnjmx3ia7fcgwpmcprvja5u
+- valory/task_execution:0.1.0:bafybeidld3hvlu6b54kkmaykiahu37oyb4l3f725tldjfpmxuuiiokv6ua
+- valory/task_submission_abci:0.1.0:bafybeifb3vw25nlz2tecbpsbzrynwva2ey4r624htty62rjg6lrqwmh6l4
 - valory/termination_abci:0.1.0:bafybeie4zvjfxvdu7qrulmur3chpjz3kpj5m4bjsxvpk4gvj5zbyyayfaa
 - valory/transaction_settlement_abci:0.1.0:bafybeiaefgqbs7zsn5xe5kdwrujj7ivygkn3ujpw6crnvi3knvxw75qmja
 - valory/websocket_client:0.1.0:bafybeidwntmkk4b2ixq5454ycbkknclqx7a6vpn7aqpm2nw3duszqrxvta
diff --git a/packages/valory/contracts/agent_mech/build/AgentMech.json b/packages/valory/contracts/agent_mech/build/AgentMech.json
index a3fd4e97..9efb8c20 100644
--- a/packages/valory/contracts/agent_mech/build/AgentMech.json
+++ b/packages/valory/contracts/agent_mech/build/AgentMech.json
@@ -1,7 +1,7 @@
 {
   "_format": "hh-sol-artifact-1",
-  "contractName": "AgentMech",
-  "sourceName": "contracts/AgentMech.sol",
+  "contractName": "AgentMechX",
+  "sourceName": "contracts/AgentMechX.sol",
   "abi": [
     {
       "inputs": [
@@ -52,28 +52,36 @@
       "type": "error"
     },
     {
-      "inputs": [],
-      "name": "ZeroAddress",
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "provided",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "max",
+          "type": "uint256"
+        }
+      ],
+      "name": "Overflow",
       "type": "error"
     },
     {
-      "anonymous": false,
       "inputs": [
         {
-          "indexed": false,
           "internalType": "uint256",
           "name": "requestId",
           "type": "uint256"
-        },
-        {
-          "indexed": false,
-          "internalType": "bytes",
-          "name": "data",
-          "type": "bytes"
         }
       ],
-      "name": "Deliver",
-      "type": "event"
+      "name": "RequestIdNotFound",
+      "type": "error"
+    },
+    {
+      "inputs": [],
+      "name": "ZeroAddress",
+      "type": "error"
     },
     {
       "anonymous": false,
@@ -86,12 +94,18 @@
         },
         {
           "indexed": false,
-          "internalType": "bytes32",
-          "name": "taskHash",
-          "type": "bytes32"
+          "internalType": "uint256",
+          "name": "requestId",
+          "type": "uint256"
+        },
+        {
+          "indexed": false,
+          "internalType": "bytes",
+          "name": "data",
+          "type": "bytes"
         }
       ],
-      "name": "Perform",
+      "name": "Deliver",
       "type": "event"
     },
     {
@@ -122,6 +136,12 @@
           "name": "requestId",
           "type": "uint256"
         },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "requestIdWithNonce",
+          "type": "uint256"
+        },
         {
           "indexed": false,
           "internalType": "bytes",
@@ -132,6 +152,70 @@
       "name": "Request",
       "type": "event"
     },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "sender",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "address",
+          "name": "target",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "uint256",
+          "name": "value",
+          "type": "uint256"
+        }
+      ],
+      "name": "Subscription",
+      "type": "event"
+    },
+    {
+      "inputs": [],
+      "name": "DOMAIN_SEPARATOR_TYPE_HASH",
+      "outputs": [
+        {
+          "internalType": "bytes32",
+          "name": "",
+          "type": "bytes32"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "VERSION",
+      "outputs": [
+        {
+          "internalType": "string",
+          "name": "",
+          "type": "string"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "chainId",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "inputs": [
         {
@@ -139,6 +223,11 @@
           "name": "requestId",
           "type": "uint256"
         },
+        {
+          "internalType": "uint256",
+          "name": "requestIdWithNonce",
+          "type": "uint256"
+        },
         {
           "internalType": "bytes",
           "name": "data",
@@ -150,6 +239,19 @@
       "stateMutability": "nonpayable",
       "type": "function"
     },
+    {
+      "inputs": [],
+      "name": "domainSeparator",
+      "outputs": [
+        {
+          "internalType": "bytes32",
+          "name": "",
+          "type": "bytes32"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "inputs": [],
       "name": "entryPoint",
@@ -202,6 +304,19 @@
       "stateMutability": "nonpayable",
       "type": "function"
     },
+    {
+      "inputs": [],
+      "name": "getDomainSeparator",
+      "outputs": [
+        {
+          "internalType": "bytes32",
+          "name": "",
+          "type": "bytes32"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "inputs": [
         {
@@ -226,6 +341,97 @@
       "stateMutability": "pure",
       "type": "function"
     },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "account",
+          "type": "address"
+        },
+        {
+          "internalType": "bytes",
+          "name": "data",
+          "type": "bytes"
+        },
+        {
+          "internalType": "uint256",
+          "name": "nonce",
+          "type": "uint256"
+        }
+      ],
+      "name": "getRequestIdWithNonce",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "requestId",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "requestId",
+          "type": "uint256"
+        }
+      ],
+      "name": "getRequestStatus",
+      "outputs": [
+        {
+          "internalType": "enum AgentMech.RequestStatus",
+          "name": "status",
+          "type": "uint8"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "account",
+          "type": "address"
+        }
+      ],
+      "name": "getRequestsCount",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "requestsCount",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "size",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "offset",
+          "type": "uint256"
+        }
+      ],
+      "name": "getUndeliveredRequestIds",
+      "outputs": [
+        {
+          "internalType": "uint256[]",
+          "name": "requestIds",
+          "type": "uint256[]"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "inputs": [
         {
@@ -269,6 +475,87 @@
       "stateMutability": "view",
       "type": "function"
     },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "name": "mapNonces",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "name": "mapRequestAddresses",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "name": "mapRequestIds",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "name": "mapRequestsCounts",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "inputs": [],
       "name": "nonce",
@@ -282,6 +569,32 @@
       "stateMutability": "view",
       "type": "function"
     },
+    {
+      "inputs": [],
+      "name": "numTotalRequests",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "numUndeliveredRequests",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "inputs": [
         {
@@ -421,6 +734,11 @@
           "internalType": "uint256",
           "name": "requestId",
           "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "requestIdWithNonce",
+          "type": "uint256"
         }
       ],
       "stateMutability": "payable",
@@ -452,6 +770,44 @@
       "stateMutability": "nonpayable",
       "type": "function"
     },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "target",
+          "type": "address"
+        }
+      ],
+      "name": "subscribe",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "payable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "name": "subscriptionBalanceOf",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "inputs": [],
       "name": "token",
@@ -651,8 +1007,8 @@
       "type": "receive"
     }
   ],
-  "bytecode": 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",
   "linkReferences": {},
   "deployedLinkReferences": {}
-}
+}
\ No newline at end of file
diff --git a/packages/valory/contracts/agent_mech/contract.py b/packages/valory/contracts/agent_mech/contract.py
index 0205ec3e..a118fe10 100644
--- a/packages/valory/contracts/agent_mech/contract.py
+++ b/packages/valory/contracts/agent_mech/contract.py
@@ -19,7 +19,7 @@
 
 """This module contains the dynamic_contribution contract definition."""
 from enum import Enum
-from typing import Any, Dict, List, cast
+from typing import Any, Dict, List, Optional, cast
 
 from aea.common import JSONLike
 from aea.configurations.base import PublicId
@@ -50,9 +50,65 @@
             ],
             "name": "Deliver",
             "type": "event",
-        }
+        },
+        {
+            "anonymous": False,
+            "inputs": [
+                {
+                    "indexed": True,
+                    "internalType": "address",
+                    "name": "sender",
+                    "type": "address",
+                },
+                {
+                    "indexed": False,
+                    "internalType": "uint256",
+                    "name": "requestId",
+                    "type": "uint256",
+                },
+                {
+                    "indexed": False,
+                    "internalType": "bytes",
+                    "name": "data",
+                    "type": "bytes",
+                },
+            ],
+            "name": "Request",
+            "type": "event",
+        },
     ],
     [
+        {
+            "anonymous": False,
+            "inputs": [
+                {
+                    "indexed": True,
+                    "internalType": "address",
+                    "name": "sender",
+                    "type": "address",
+                },
+                {
+                    "indexed": False,
+                    "internalType": "uint256",
+                    "name": "requestId",
+                    "type": "uint256",
+                },
+                {
+                    "indexed": False,
+                    "internalType": "uint256",
+                    "name": "requestIdWithNonce",
+                    "type": "uint256",
+                },
+                {
+                    "indexed": False,
+                    "internalType": "bytes",
+                    "name": "data",
+                    "type": "bytes",
+                },
+            ],
+            "name": "Request",
+            "type": "event",
+        },
         {
             "anonymous": False,
             "inputs": [
@@ -77,7 +133,7 @@
             ],
             "name": "Deliver",
             "type": "event",
-        }
+        },
     ],
 ]
 
@@ -147,7 +203,12 @@ def get_state(
 
     @classmethod
     def get_deliver_data(
-        cls, ledger_api: LedgerApi, contract_address: str, request_id: int, data: str
+        cls,
+        ledger_api: LedgerApi,
+        contract_address: str,
+        request_id: int,
+        data: str,
+        request_id_nonce: Optional[int],
     ) -> JSONLike:
         """
         Deliver a response to a request.
@@ -156,6 +217,7 @@ def get_deliver_data(
         :param contract_address: the address of the token to be used
         :param request_id: the id of the target request
         :param data: the response data
+        :param request_id_nonce: request id with nonce, to ensure uniqueness on-chain.
         :return: the deliver data
         """
         ledger_api = cast(EthereumApi, ledger_api)
@@ -163,10 +225,36 @@ def get_deliver_data(
         if not isinstance(ledger_api, EthereumApi):
             raise ValueError(f"Only EthereumApi is supported, got {type(ledger_api)}")
 
-        contract_instance = cls.get_instance(ledger_api, contract_address)
-        data = contract_instance.encodeABI(
-            fn_name="deliver", args=[request_id, bytes.fromhex(data)]
-        )
+        deliver_with_nonce = [
+            {
+                "inputs": [
+                    {"internalType": "uint256", "name": "requestId", "type": "uint256"},
+                    {
+                        "internalType": "uint256",
+                        "name": "requestIdWithNonce",
+                        "type": "uint256",
+                    },
+                    {"internalType": "bytes", "name": "data", "type": "bytes"},
+                ],
+                "name": "deliver",
+                "outputs": [],
+                "stateMutability": "nonpayable",
+                "type": "function",
+            }
+        ]
+        if request_id_nonce is not None:
+            contract_instance = ledger_api.api.eth.contract(
+                contract_address, abi=deliver_with_nonce
+            )
+            data = contract_instance.encodeABI(
+                fn_name="deliver",
+                args=[request_id, request_id_nonce, bytes.fromhex(data)],
+            )
+        else:
+            contract_instance = cls.get_instance(ledger_api, contract_address)
+            data = contract_instance.encodeABI(
+                fn_name="deliver", args=[request_id, bytes.fromhex(data)]
+            )
         return {"data": bytes.fromhex(data[2:])}  # type: ignore
 
     @classmethod
@@ -179,19 +267,23 @@ def get_request_events(
     ) -> JSONLike:
         """Get the Request events emitted by the contract."""
         ledger_api = cast(EthereumApi, ledger_api)
-        contract_instance = cls.get_instance(ledger_api, contract_address)
-        entries = contract_instance.events.Request.create_filter(
-            fromBlock=from_block,
-            toBlock=to_block,
-        ).get_all_entries()
+        all_entries = []
+        for abi in partial_abis:
+            contract_instance = ledger_api.api.eth.contract(contract_address, abi=abi)
+            entries = contract_instance.events.Request.create_filter(
+                fromBlock=from_block,
+                toBlock=to_block,
+            ).get_all_entries()
+            all_entries.extend(entries)
+
         request_events = list(
             {
                 "tx_hash": entry.transactionHash.hex(),
                 "block_number": entry.blockNumber,
-                "contract_address": contract_address,
                 **entry["args"],
+                "contract_address": contract_address,
             }
-            for entry in entries
+            for entry in all_entries
         )
         return {"data": request_events}
 
diff --git a/packages/valory/contracts/agent_mech/contract.yaml b/packages/valory/contracts/agent_mech/contract.yaml
index 51cd8205..0189d98f 100644
--- a/packages/valory/contracts/agent_mech/contract.yaml
+++ b/packages/valory/contracts/agent_mech/contract.yaml
@@ -7,8 +7,8 @@ license: Apache-2.0
 aea_version: '>=1.0.0, <2.0.0'
 fingerprint:
   __init__.py: bafybeigpq5lxfj2aza6ok3fjuywtdafelkbvoqwaits7regfbgu4oynmku
-  build/AgentMech.json: bafybeienu4zryyvn6jvjfuhlzxonij7oim7hm3nf2atpjl7swx2amagv4q
-  contract.py: bafybeiadqkaqo5b2upmrubn7jmezhwyib7ybyxhoanhujdipl3cza76xqi
+  build/AgentMech.json: bafybeigo2x7njyx5ttawfrf5pdjewe2dbh2u56vra7bm6vrohuu4xcmz3u
+  contract.py: bafybeiawilbhsix4ui3whuoyk6sgundbbpeatbidv4krp2c45cpayhfu7m
 fingerprint_ignore_patterns: []
 class_name: AgentMechContract
 contract_interface_paths:
diff --git a/packages/valory/services/mech/service.yaml b/packages/valory/services/mech/service.yaml
index 99447062..b30e0e74 100644
--- a/packages/valory/services/mech/service.yaml
+++ b/packages/valory/services/mech/service.yaml
@@ -7,7 +7,7 @@ license: Apache-2.0
 fingerprint:
   README.md: bafybeif7ia4jdlazy6745ke2k2x5yoqlwsgwr6sbztbgqtwvs3ndm2p7ba
 fingerprint_ignore_patterns: []
-agent: valory/mech:0.1.0:bafybeia4hfn4yvcpirwfhyk6uq7v7mwxqoawxi5dvhudc2x5wpqzfklyle
+agent: valory/mech:0.1.0:bafybeiflfz2kcy2adgjtx3ad47u5axbkjjcej56xladjkoa3i4ufpqdyua
 number_of_agents: 4
 deployment:
   agent:
diff --git a/packages/valory/skills/mech_abci/skill.yaml b/packages/valory/skills/mech_abci/skill.yaml
index e8604f59..b43c5238 100644
--- a/packages/valory/skills/mech_abci/skill.yaml
+++ b/packages/valory/skills/mech_abci/skill.yaml
@@ -23,10 +23,10 @@ skills:
 - valory/abstract_round_abci:0.1.0:bafybeiaqcl7h2famylusiffigwem7tevkcsyocdu5xd42jkmgq6kvowzgq
 - valory/registration_abci:0.1.0:bafybeic2ynseiak7jpta7jfwuqwyp453b4p7lolr4wihxmpn633uekv5am
 - valory/reset_pause_abci:0.1.0:bafybeidzajbe3erygeh2xbd6lrjv7nsptznjuzrt24ykgvhgotdeyhfnba
-- valory/task_submission_abci:0.1.0:bafybeideyqmjbn5ipk6kdiaq6fdh7se4vsgzmpzncapb4hkqb7awjodzki
+- valory/task_submission_abci:0.1.0:bafybeifb3vw25nlz2tecbpsbzrynwva2ey4r624htty62rjg6lrqwmh6l4
 - valory/termination_abci:0.1.0:bafybeie4zvjfxvdu7qrulmur3chpjz3kpj5m4bjsxvpk4gvj5zbyyayfaa
 - valory/transaction_settlement_abci:0.1.0:bafybeiaefgqbs7zsn5xe5kdwrujj7ivygkn3ujpw6crnvi3knvxw75qmja
-- valory/subscription_abci:0.1.0:bafybeiadm75c5bytop2zqyftstl53ggtocc4gassbpqiq3ybtpumar3pye
+- valory/subscription_abci:0.1.0:bafybeibgnw53s5nh6up35z6fgjisrrvrlt4nnjmx3ia7fcgwpmcprvja5u
 behaviours:
   main:
     args: {}
diff --git a/packages/valory/skills/subscription_abci/skill.yaml b/packages/valory/skills/subscription_abci/skill.yaml
index e7e0559b..0576281e 100644
--- a/packages/valory/skills/subscription_abci/skill.yaml
+++ b/packages/valory/skills/subscription_abci/skill.yaml
@@ -18,7 +18,7 @@ fingerprint:
 fingerprint_ignore_patterns: []
 connections: []
 contracts:
-- valory/agent_mech:0.1.0:bafybeih6fyszhp5kloosiqnmim2l4kgj7g6cetbe5fwvzojahm34smjvhu
+- valory/agent_mech:0.1.0:bafybeig7zpqhcpt6z4eutedx6prciuq4g7mpadw636zkkcx3ach6oytdry
 - valory/gnosis_safe:0.1.0:bafybeidll7frtdsq2ckiluazkwk4zpkp7natt4kdejjehwvykqwzyuf6ei
 - valory/multisend:0.1.0:bafybeig5byt5urg2d2bsecufxe5ql7f4mezg3mekfleeh32nmuusx66p4y
 protocols:
diff --git a/packages/valory/skills/task_execution/behaviours.py b/packages/valory/skills/task_execution/behaviours.py
index 82c67389..d3959ea1 100644
--- a/packages/valory/skills/task_execution/behaviours.py
+++ b/packages/valory/skills/task_execution/behaviours.py
@@ -277,6 +277,7 @@ def _handle_done_task(self, task_result: Any) -> None:
         """Handle done tasks"""
         executing_task = cast(Dict[str, Any], self._executing_task)
         req_id = executing_task.get("requestId", None)
+        request_id_nonce = executing_task.get("requestIdWithNonce", None)
         mech_address = executing_task.get("contract_address", None)
         tool = executing_task.get("tool", None)
         response = {"requestId": req_id, "result": "Invalid response"}
@@ -286,6 +287,7 @@ def _handle_done_task(self, task_result: Any) -> None:
             "mech_address": mech_address,
             "task_executor_address": task_executor,
             "tool": tool,
+            "request_id_nonce": request_id_nonce,
         }
         if task_result is not None:
             # task succeeded
diff --git a/packages/valory/skills/task_execution/skill.yaml b/packages/valory/skills/task_execution/skill.yaml
index 2d3f622f..a378bcc8 100644
--- a/packages/valory/skills/task_execution/skill.yaml
+++ b/packages/valory/skills/task_execution/skill.yaml
@@ -7,7 +7,7 @@ license: Apache-2.0
 aea_version: '>=1.0.0, <2.0.0'
 fingerprint:
   __init__.py: bafybeidqhvvlnthkbnmrdkdeyjyx2f2ab6z4xdgmagh7welqnh2v6wczx4
-  behaviours.py: bafybeib6ft3iigddo37zv7iejgzcc4wp3v7ocvwvx2czwzt4jhdyadmluu
+  behaviours.py: bafybeifa72egwarcmfneqmo3ak6wfygjc3i7hplxl6ptafb263vuaey3fm
   dialogues.py: bafybeid4zxalqdlo5mw4yfbuf34hx4jp5ay5z6chm4zviwu4cj7fudtwca
   handlers.py: bafybeidbt5ezj74cgfogk3w4uw4si2grlnk5g54veyumw7g5yh6gdscywu
   models.py: bafybeihgclxctyltuehj2f4fzj26edptqugrrm4phd6ovuulezrqot6qo4
@@ -20,7 +20,7 @@ connections:
 - valory/ipfs:0.1.0:bafybeihx7wb5hngjobw2salzqqryrhxvmxfuw7o2npjyqd2talmh2flqeq
 - valory/p2p_libp2p_client:0.1.0:bafybeihge56dn3xep2dzomu7rtvbgo4uc2qqh7ljl3fubqdi2lq44gs5lq
 contracts:
-- valory/agent_mech:0.1.0:bafybeih6fyszhp5kloosiqnmim2l4kgj7g6cetbe5fwvzojahm34smjvhu
+- valory/agent_mech:0.1.0:bafybeig7zpqhcpt6z4eutedx6prciuq4g7mpadw636zkkcx3ach6oytdry
 protocols:
 - valory/acn_data_share:0.1.0:bafybeih5ydonnvrwvy2ygfqgfabkr47s4yw3uqxztmwyfprulwfsoe7ipq
 - valory/contract_api:1.0.0:bafybeialhbjvwiwcnqq3ysxcyemobcbie7xza66gaofcvla5njezkvhcka
diff --git a/packages/valory/skills/task_submission_abci/behaviours.py b/packages/valory/skills/task_submission_abci/behaviours.py
index 29fe824e..40885c01 100644
--- a/packages/valory/skills/task_submission_abci/behaviours.py
+++ b/packages/valory/skills/task_submission_abci/behaviours.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 # ------------------------------------------------------------------------------
 #
-#   Copyright 2023 Valory AG
+#   Copyright 2023-2024 Valory AG
 #
 #   Licensed under the Apache License, Version 2.0 (the "License");
 #   you may not use this file except in compliance with the License.
@@ -819,6 +819,7 @@ def _get_deliver_tx(
             contract_callable="get_deliver_data",
             request_id=task_data["request_id"],
             data=task_data["task_result"],
+            request_id_nonce=task_data["request_id_nonce"],
         )
         if (
             contract_api_msg.performative != ContractApiMessage.Performative.STATE
diff --git a/packages/valory/skills/task_submission_abci/skill.yaml b/packages/valory/skills/task_submission_abci/skill.yaml
index 1aa07792..71094b9c 100644
--- a/packages/valory/skills/task_submission_abci/skill.yaml
+++ b/packages/valory/skills/task_submission_abci/skill.yaml
@@ -8,7 +8,7 @@ license: Apache-2.0
 aea_version: '>=1.0.0, <2.0.0'
 fingerprint:
   __init__.py: bafybeiholqak7ltw6bbmn2c5tn3j7xgzkdlfzp3kcskiqsvmxoih6m4muq
-  behaviours.py: bafybeig7wngxnzdshonx7fblsy3nbxior6bxu7bfz77rsn5mq2njhxu7ya
+  behaviours.py: bafybeif74c5ieukt56bgq3ynpwfxdpp36ug2rrejm76vxhuw5r2lqjpsqq
   dialogues.py: bafybeibmac3m5u5h6ucoyjr4dazay72dyga656wvjl6z6saapluvjo54ne
   fsm_specification.yaml: bafybeig6bhn554qyou7kef5bstnlv54zke32avyti63uu4hvsol3lzqkoi
   handlers.py: bafybeibe5n7my2vd2wlwo73sbma65epjqc7kxgtittewlylcmvnmoxtxzq
@@ -19,7 +19,7 @@ fingerprint:
 fingerprint_ignore_patterns: []
 connections: []
 contracts:
-- valory/agent_mech:0.1.0:bafybeih6fyszhp5kloosiqnmim2l4kgj7g6cetbe5fwvzojahm34smjvhu
+- valory/agent_mech:0.1.0:bafybeig7zpqhcpt6z4eutedx6prciuq4g7mpadw636zkkcx3ach6oytdry
 - valory/agent_registry:0.1.0:bafybeiargayav6yiztdnwzejoejstcx4idssch2h4f5arlgtzj3tgsgfmu
 - valory/gnosis_safe:0.1.0:bafybeidll7frtdsq2ckiluazkwk4zpkp7natt4kdejjehwvykqwzyuf6ei
 - valory/multisend:0.1.0:bafybeig5byt5urg2d2bsecufxe5ql7f4mezg3mekfleeh32nmuusx66p4y
@@ -141,7 +141,6 @@ models:
       tendermint_url: http://localhost:26657
       tx_timeout: 10.0
       use_termination: false
-      manual_gas_limit: 1000000
       validate_timeout: 1205
       use_slashing: false
       service_owner_share: 0.1