diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d8a4c30ae7..e5160e9c6a3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,8 @@ Description of the upcoming release here.
 
 ### Changed
 
+- [#1302](https://github.com/FuelLabs/fuel-core/pull/1302): Removed the usage of flake and building of the bridge contract ABI.
+    It simplifies the maintenance and updating of the events, requiring only putting the event definition into the codebase of the relayer.
 - [#1293](https://github.com/FuelLabs/fuel-core/issues/1293): Parallelized the `estimate_predicates` endpoint to utilize all available threads.
 
 #### Breaking
diff --git a/crates/services/relayer/README.md b/crates/services/relayer/README.md
index 260eaf344c7..37c13ced9c1 100644
--- a/crates/services/relayer/README.md
+++ b/crates/services/relayer/README.md
@@ -25,22 +25,3 @@ If the state determines that the relayer is out of sync with the DA layer then l
 The range of blocks is `(last_downloaded_height + 1)..=current_finalized_height`.
 
 Logs are paginated into sets of blocks to avoid overloading a single rpc call.
-
-## Contract Flake
-The `flake.nix` in this repo has a tool to fetch, compile and generate the abi for the fuel contracts.
-While it is not mandatory to use nix to do this the advantage is the exact versions of the contracts that were used to generate the abi files is pinned in the `flake.lock` file.
-
-### Usage
-To generate the api files run the following from the `fuel-core-relayer` directory.
-```bash
-nix run .#generate-abi-json abi
-```
-To update the version of the contracts that is used run:
-```bash
-nix flake update
-nix run .#generate-abi-json abi
-```
-You can see the versions that are pinned by running:
-```bash
-nix flake info
-```
\ No newline at end of file
diff --git a/crates/services/relayer/abi/FuelMessagePortal.json b/crates/services/relayer/abi/FuelMessagePortal.json
deleted file mode 100644
index 1d686c0d685..00000000000
--- a/crates/services/relayer/abi/FuelMessagePortal.json
+++ /dev/null
@@ -1,736 +0,0 @@
-[
-  {
-    "inputs": [],
-    "stateMutability": "nonpayable",
-    "type": "constructor"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": false,
-        "internalType": "address",
-        "name": "previousAdmin",
-        "type": "address"
-      },
-      {
-        "indexed": false,
-        "internalType": "address",
-        "name": "newAdmin",
-        "type": "address"
-      }
-    ],
-    "name": "AdminChanged",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": true,
-        "internalType": "address",
-        "name": "beacon",
-        "type": "address"
-      }
-    ],
-    "name": "BeaconUpgraded",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": false,
-        "internalType": "uint8",
-        "name": "version",
-        "type": "uint8"
-      }
-    ],
-    "name": "Initialized",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": true,
-        "internalType": "bytes32",
-        "name": "messageId",
-        "type": "bytes32"
-      },
-      {
-        "indexed": true,
-        "internalType": "bytes32",
-        "name": "sender",
-        "type": "bytes32"
-      },
-      {
-        "indexed": true,
-        "internalType": "bytes32",
-        "name": "recipient",
-        "type": "bytes32"
-      },
-      {
-        "indexed": false,
-        "internalType": "uint64",
-        "name": "amount",
-        "type": "uint64"
-      }
-    ],
-    "name": "MessageRelayed",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": true,
-        "internalType": "bytes32",
-        "name": "sender",
-        "type": "bytes32"
-      },
-      {
-        "indexed": true,
-        "internalType": "bytes32",
-        "name": "recipient",
-        "type": "bytes32"
-      },
-      {
-        "indexed": true,
-        "internalType": "uint256",
-        "name": "nonce",
-        "type": "uint256"
-      },
-      {
-        "indexed": false,
-        "internalType": "uint64",
-        "name": "amount",
-        "type": "uint64"
-      },
-      {
-        "indexed": false,
-        "internalType": "bytes",
-        "name": "data",
-        "type": "bytes"
-      }
-    ],
-    "name": "MessageSent",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": false,
-        "internalType": "address",
-        "name": "account",
-        "type": "address"
-      }
-    ],
-    "name": "Paused",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": true,
-        "internalType": "bytes32",
-        "name": "role",
-        "type": "bytes32"
-      },
-      {
-        "indexed": true,
-        "internalType": "bytes32",
-        "name": "previousAdminRole",
-        "type": "bytes32"
-      },
-      {
-        "indexed": true,
-        "internalType": "bytes32",
-        "name": "newAdminRole",
-        "type": "bytes32"
-      }
-    ],
-    "name": "RoleAdminChanged",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": true,
-        "internalType": "bytes32",
-        "name": "role",
-        "type": "bytes32"
-      },
-      {
-        "indexed": true,
-        "internalType": "address",
-        "name": "account",
-        "type": "address"
-      },
-      {
-        "indexed": true,
-        "internalType": "address",
-        "name": "sender",
-        "type": "address"
-      }
-    ],
-    "name": "RoleGranted",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": true,
-        "internalType": "bytes32",
-        "name": "role",
-        "type": "bytes32"
-      },
-      {
-        "indexed": true,
-        "internalType": "address",
-        "name": "account",
-        "type": "address"
-      },
-      {
-        "indexed": true,
-        "internalType": "address",
-        "name": "sender",
-        "type": "address"
-      }
-    ],
-    "name": "RoleRevoked",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": false,
-        "internalType": "address",
-        "name": "account",
-        "type": "address"
-      }
-    ],
-    "name": "Unpaused",
-    "type": "event"
-  },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": true,
-        "internalType": "address",
-        "name": "implementation",
-        "type": "address"
-      }
-    ],
-    "name": "Upgraded",
-    "type": "event"
-  },
-  {
-    "inputs": [],
-    "name": "DEFAULT_ADMIN_ROLE",
-    "outputs": [
-      {
-        "internalType": "bytes32",
-        "name": "",
-        "type": "bytes32"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [],
-    "name": "ETH_DECIMALS",
-    "outputs": [
-      {
-        "internalType": "uint256",
-        "name": "",
-        "type": "uint256"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [],
-    "name": "FUEL_BASE_ASSET_DECIMALS",
-    "outputs": [
-      {
-        "internalType": "uint256",
-        "name": "",
-        "type": "uint256"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [],
-    "name": "MAX_MESSAGE_DATA_SIZE",
-    "outputs": [
-      {
-        "internalType": "uint256",
-        "name": "",
-        "type": "uint256"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [],
-    "name": "PAUSER_ROLE",
-    "outputs": [
-      {
-        "internalType": "bytes32",
-        "name": "",
-        "type": "bytes32"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "internalType": "bytes32",
-        "name": "recipient",
-        "type": "bytes32"
-      }
-    ],
-    "name": "depositETH",
-    "outputs": [],
-    "stateMutability": "payable",
-    "type": "function"
-  },
-  {
-    "inputs": [],
-    "name": "fuelBaseAssetDecimals",
-    "outputs": [
-      {
-        "internalType": "uint8",
-        "name": "",
-        "type": "uint8"
-      }
-    ],
-    "stateMutability": "pure",
-    "type": "function"
-  },
-  {
-    "inputs": [],
-    "name": "fuelChainConsensusContract",
-    "outputs": [
-      {
-        "internalType": "address",
-        "name": "",
-        "type": "address"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "internalType": "bytes32",
-        "name": "role",
-        "type": "bytes32"
-      }
-    ],
-    "name": "getRoleAdmin",
-    "outputs": [
-      {
-        "internalType": "bytes32",
-        "name": "",
-        "type": "bytes32"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "internalType": "bytes32",
-        "name": "role",
-        "type": "bytes32"
-      },
-      {
-        "internalType": "address",
-        "name": "account",
-        "type": "address"
-      }
-    ],
-    "name": "grantRole",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "internalType": "bytes32",
-        "name": "role",
-        "type": "bytes32"
-      },
-      {
-        "internalType": "address",
-        "name": "account",
-        "type": "address"
-      }
-    ],
-    "name": "hasRole",
-    "outputs": [
-      {
-        "internalType": "bool",
-        "name": "",
-        "type": "bool"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "internalType": "bytes32",
-        "name": "messageId",
-        "type": "bytes32"
-      }
-    ],
-    "name": "incomingMessageSuccessful",
-    "outputs": [
-      {
-        "internalType": "bool",
-        "name": "",
-        "type": "bool"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "internalType": "contract FuelChainConsensus",
-        "name": "fuelChainConsensus",
-        "type": "address"
-      }
-    ],
-    "name": "initialize",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [],
-    "name": "messageSender",
-    "outputs": [
-      {
-        "internalType": "bytes32",
-        "name": "",
-        "type": "bytes32"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [],
-    "name": "pause",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [],
-    "name": "paused",
-    "outputs": [
-      {
-        "internalType": "bool",
-        "name": "",
-        "type": "bool"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [],
-    "name": "proxiableUUID",
-    "outputs": [
-      {
-        "internalType": "bytes32",
-        "name": "",
-        "type": "bytes32"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "components": [
-          {
-            "internalType": "bytes32",
-            "name": "sender",
-            "type": "bytes32"
-          },
-          {
-            "internalType": "bytes32",
-            "name": "recipient",
-            "type": "bytes32"
-          },
-          {
-            "internalType": "bytes32",
-            "name": "nonce",
-            "type": "bytes32"
-          },
-          {
-            "internalType": "uint64",
-            "name": "amount",
-            "type": "uint64"
-          },
-          {
-            "internalType": "bytes",
-            "name": "data",
-            "type": "bytes"
-          }
-        ],
-        "internalType": "struct Message",
-        "name": "message",
-        "type": "tuple"
-      },
-      {
-        "components": [
-          {
-            "internalType": "bytes32",
-            "name": "prevRoot",
-            "type": "bytes32"
-          },
-          {
-            "internalType": "uint64",
-            "name": "height",
-            "type": "uint64"
-          },
-          {
-            "internalType": "uint64",
-            "name": "timestamp",
-            "type": "uint64"
-          },
-          {
-            "internalType": "bytes32",
-            "name": "applicationHash",
-            "type": "bytes32"
-          }
-        ],
-        "internalType": "struct FuelBlockHeaderLite",
-        "name": "rootBlockHeader",
-        "type": "tuple"
-      },
-      {
-        "components": [
-          {
-            "internalType": "bytes32",
-            "name": "prevRoot",
-            "type": "bytes32"
-          },
-          {
-            "internalType": "uint64",
-            "name": "height",
-            "type": "uint64"
-          },
-          {
-            "internalType": "uint64",
-            "name": "timestamp",
-            "type": "uint64"
-          },
-          {
-            "internalType": "uint64",
-            "name": "daHeight",
-            "type": "uint64"
-          },
-          {
-            "internalType": "uint64",
-            "name": "txCount",
-            "type": "uint64"
-          },
-          {
-            "internalType": "uint64",
-            "name": "outputMessagesCount",
-            "type": "uint64"
-          },
-          {
-            "internalType": "bytes32",
-            "name": "txRoot",
-            "type": "bytes32"
-          },
-          {
-            "internalType": "bytes32",
-            "name": "outputMessagesRoot",
-            "type": "bytes32"
-          }
-        ],
-        "internalType": "struct FuelBlockHeader",
-        "name": "blockHeader",
-        "type": "tuple"
-      },
-      {
-        "components": [
-          {
-            "internalType": "uint256",
-            "name": "key",
-            "type": "uint256"
-          },
-          {
-            "internalType": "bytes32[]",
-            "name": "proof",
-            "type": "bytes32[]"
-          }
-        ],
-        "internalType": "struct MerkleProof",
-        "name": "blockInHistoryProof",
-        "type": "tuple"
-      },
-      {
-        "components": [
-          {
-            "internalType": "uint256",
-            "name": "key",
-            "type": "uint256"
-          },
-          {
-            "internalType": "bytes32[]",
-            "name": "proof",
-            "type": "bytes32[]"
-          }
-        ],
-        "internalType": "struct MerkleProof",
-        "name": "messageInBlockProof",
-        "type": "tuple"
-      }
-    ],
-    "name": "relayMessage",
-    "outputs": [],
-    "stateMutability": "payable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "internalType": "bytes32",
-        "name": "role",
-        "type": "bytes32"
-      },
-      {
-        "internalType": "address",
-        "name": "account",
-        "type": "address"
-      }
-    ],
-    "name": "renounceRole",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "internalType": "bytes32",
-        "name": "role",
-        "type": "bytes32"
-      },
-      {
-        "internalType": "address",
-        "name": "account",
-        "type": "address"
-      }
-    ],
-    "name": "revokeRole",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "internalType": "bytes32",
-        "name": "recipient",
-        "type": "bytes32"
-      },
-      {
-        "internalType": "bytes",
-        "name": "data",
-        "type": "bytes"
-      }
-    ],
-    "name": "sendMessage",
-    "outputs": [],
-    "stateMutability": "payable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "internalType": "bytes4",
-        "name": "interfaceId",
-        "type": "bytes4"
-      }
-    ],
-    "name": "supportsInterface",
-    "outputs": [
-      {
-        "internalType": "bool",
-        "name": "",
-        "type": "bool"
-      }
-    ],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [],
-    "name": "unpause",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "internalType": "address",
-        "name": "newImplementation",
-        "type": "address"
-      }
-    ],
-    "name": "upgradeTo",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      {
-        "internalType": "address",
-        "name": "newImplementation",
-        "type": "address"
-      },
-      {
-        "internalType": "bytes",
-        "name": "data",
-        "type": "bytes"
-      }
-    ],
-    "name": "upgradeToAndCall",
-    "outputs": [],
-    "stateMutability": "payable",
-    "type": "function"
-  }
-]
\ No newline at end of file
diff --git a/crates/services/relayer/flake.lock b/crates/services/relayer/flake.lock
deleted file mode 100644
index 7170f71583b..00000000000
--- a/crates/services/relayer/flake.lock
+++ /dev/null
@@ -1,129 +0,0 @@
-{
-  "nodes": {
-    "dapptools": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1663083918,
-        "narHash": "sha256-JVRKYeHidAdaqzypn4UZvJ/1WGCt8nK7VUm5W7KDZyA=",
-        "owner": "dapphub",
-        "repo": "dapptools",
-        "rev": "01ef8ea418c3fe49089a44d56013d8fcc34a1ec2",
-        "type": "github"
-      },
-      "original": {
-        "owner": "dapphub",
-        "ref": "master",
-        "repo": "dapptools",
-        "type": "github"
-      }
-    },
-    "fuel-v1-contracts": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1659016279,
-        "narHash": "sha256-naEkyaXa5BROsIDas1sYdJ5mvZPK1j/ftB7i7k5BqzM=",
-        "owner": "FuelLabs",
-        "repo": "fuel-merkle-sol",
-        "rev": "90e8463074d9c038ef7f0b15d3bb91549812bb02",
-        "type": "github"
-      },
-      "original": {
-        "owner": "FuelLabs",
-        "repo": "fuel-merkle-sol",
-        "type": "github"
-      }
-    },
-    "fuel-v2-contracts": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1660957336,
-        "narHash": "sha256-J+jgpJabagUwE6Orlb5kqfBGS11psBBw5SoghUoeQyA=",
-        "ref": "refs/heads/master",
-        "rev": "3161ba9a80b827bfbb9fbc9c8f2db421db30d230",
-        "revCount": 209,
-        "type": "git",
-        "url": "ssh://git@github.com/fuellabs/fuel-v2-contracts/"
-      },
-      "original": {
-        "type": "git",
-        "url": "ssh://git@github.com/fuellabs/fuel-v2-contracts/"
-      }
-    },
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1664370076,
-        "narHash": "sha256-NDnIo0nxJozLwEw0VPM+RApMA90uTfbvaNNtC5eB7Os=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "854fdc68881791812eddd33b2fed94b954979a8e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1653917367,
-        "narHash": "sha256-04MsJC0g9kE01nBuXThMppZK+yvCZECQnUaZKSU+HJo=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "437c8e6554911095f0557d524e9d2ffe1c26e33a",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "type": "indirect"
-      }
-    },
-    "npm": {
-      "inputs": {
-        "nixpkgs": "nixpkgs_2"
-      },
-      "locked": {
-        "lastModified": 1664286682,
-        "narHash": "sha256-OBdpqW2zpwYF/JWUk013rbMdIC3R17ynX78tQPbfHNw=",
-        "owner": "serokell",
-        "repo": "nix-npm-buildpackage",
-        "rev": "bc0c4989f664ff262d3ab39cad9dc0f6f1c10017",
-        "type": "github"
-      },
-      "original": {
-        "owner": "serokell",
-        "repo": "nix-npm-buildpackage",
-        "type": "github"
-      }
-    },
-    "open-zeppelin": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1664402754,
-        "narHash": "sha256-Yj+YrCTmAcEYrl39YKYg3gL+rHABQi9PAqO01cC9cCc=",
-        "owner": "OpenZeppelin",
-        "repo": "openzeppelin-contracts",
-        "rev": "26dddee1c05ff91264ae24c5c172bd05827cf5d8",
-        "type": "github"
-      },
-      "original": {
-        "owner": "OpenZeppelin",
-        "repo": "openzeppelin-contracts",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "dapptools": "dapptools",
-        "fuel-v1-contracts": "fuel-v1-contracts",
-        "fuel-v2-contracts": "fuel-v2-contracts",
-        "nixpkgs": "nixpkgs",
-        "npm": "npm",
-        "open-zeppelin": "open-zeppelin"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
diff --git a/crates/services/relayer/flake.nix b/crates/services/relayer/flake.nix
deleted file mode 100644
index d68f9aa6f97..00000000000
--- a/crates/services/relayer/flake.nix
+++ /dev/null
@@ -1,68 +0,0 @@
-{
-  description = ''
-    A Nix flake for compiling and extracting the fuel contract abi.
-  '';
-
-  inputs = {
-    open-zeppelin = {
-      url = "github:OpenZeppelin/openzeppelin-contracts";
-      flake = false;
-    };
-    fuel-v1-contracts = {
-      url = "github:FuelLabs/fuel-merkle-sol";
-      flake = false;
-    };
-    fuel-v2-contracts.url = "git+ssh://git@github.com/fuellabs/fuel-v2-contracts/";
-    fuel-v2-contracts.flake = false;
-    nixpkgs = {
-      url = "github:NixOS/nixpkgs/nixos-unstable";
-    };
-    dapptools = {
-      url = "github:dapphub/dapptools/master";
-      flake = false;
-    };
-    npm.url = "github:/serokell/nix-npm-buildpackage";
-  };
-
-  outputs = inputs: let
-    system = "x86_64-darwin";
-    dapp = import inputs.dapptools {inherit system;};
-    solc = dapp.runCommand "solc" {} "mkdir -p $out/bin; ln -s ${dapp.solc-static-versions.solc_0_8_9}/bin/solc-0.8.9 $out/bin/solc";
-    overlays = [inputs.npm.overlays.default];
-    pkgs = import inputs.nixpkgs {inherit overlays system;};
-  in {
-    packages."x86_64-darwin" = {
-      add-folder = pkgs.linkFarm "contracts-with-layer" [
-        {
-          name = "merkle-sol";
-          path = inputs.fuel-v1-contracts;
-        }
-      ];
-      build-abi-json =
-        pkgs.runCommand
-        "build-abi-json"
-        {}
-        ''
-          ${solc}/bin/solc --abi --pretty-json ${inputs.fuel-v2-contracts}/contracts/sidechain/FuelSidechain.sol @openzeppelin=${inputs.open-zeppelin} @fuel-contracts=${inputs.self.packages."${system}".add-folder} -o $out/build
-        '';
-      generate-abi-json = pkgs.writeShellApplication {
-        name = "generate-abi-0json";
-        runtimeInputs = [solc pkgs.jq inputs.self.packages."${system}".build-abi-json];
-        text = ''
-          if [[ -z $1 ]] 
-          then 
-            echo "Invalid input. Must provide output directoy" >&2; exit 1;
-          fi
-          declare -a arr=("FuelMessagePortal")
-          for i in "''${arr[@]}"
-          do  
-            (cat ${inputs.self.packages."${system}".build-abi-json}/build/"$i".abi) | jq '.' > "$1"/"$i".json
-          done
-        '';
-      };
-
-      
-    };
-    formatter.x86_64-darwin = pkgs.alejandra;
-  };
-}
diff --git a/crates/services/relayer/src/abi.rs b/crates/services/relayer/src/abi.rs
index 8eb7ddd5cf5..82ea7c57ab6 100644
--- a/crates/services/relayer/src/abi.rs
+++ b/crates/services/relayer/src/abi.rs
@@ -2,13 +2,12 @@
 use ethers_contract::abigen;
 
 pub mod bridge {
-    // The `FuelMessagePortal.json` file is auto-generated from contracts:
-    // https://github.com/FuelLabs/fuel-v2-contracts
-    //
-    // To re-generate the file:
-    // 1. Download the repository
-    // 2. Build the contracts(Check the `README.md` file for details).
-    // 3. Copy the content of the `abi` field in the
-    //  `artifacts/contracts/fuelchain/FuelMessagePortal.sol/FuelMessagePortal.json`
-    super::abigen!(MessageSent, "abi/FuelMessagePortal.json");
+    // The link to the original event definition:
+    // https://github.com/FuelLabs/fuel-bridge/blob/05c4d9cced70d262742e20c85c7ef8a5d8898701/packages/portal-contracts/contracts/fuelchain/FuelMessagePortal.sol#L54
+    super::abigen!(
+        MessageSent,
+        r#"[
+            event MessageSent(bytes32 indexed sender, bytes32 indexed recipient, uint256 indexed nonce, uint64 amount, bytes data)
+        ]"#,
+    );
 }