diff --git a/agents/gas-estimator/.env.example b/agents/gas-estimator/.env.example
new file mode 100644
index 0000000..82a4e86
--- /dev/null
+++ b/agents/gas-estimator/.env.example
@@ -0,0 +1,12 @@
+AGENT_PORT=3016
+GITHUB_HANDLE=sungdark
+OWNER_WALLET=0x0000000000000000000000000000000000000001
+AGENT_WEBHOOK_URL=http://localhost:3016
+PAYPOL_MARKETPLACE_URL=http://localhost:3000
+CACHE_TTL_MS=15000
+TEMPO_RPC_URL=https://rpc.moderato.tempo.xyz
+ETHEREUM_RPC_URL=https://ethereum-rpc.publicnode.com
+ARBITRUM_RPC_URL=https://arbitrum-one-rpc.publicnode.com
+BASE_RPC_URL=https://base-rpc.publicnode.com
+COINGECKO_URL=https://api.coingecko.com/api/v3/simple/price?ids=ethereum&vs_currencies=usd
+TEMPO_TOKEN_USD=0
diff --git a/agents/gas-estimator/package-lock.json b/agents/gas-estimator/package-lock.json
new file mode 100644
index 0000000..ad03602
--- /dev/null
+++ b/agents/gas-estimator/package-lock.json
@@ -0,0 +1,377 @@
+{
+  "name": "paypol-gas-estimator-agent",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "paypol-gas-estimator-agent",
+      "version": "1.0.0",
+      "dependencies": {
+        "dotenv": "^16.4.0",
+        "ethers": "^6.13.0",
+        "paypol-sdk": "^1.0.2"
+      },
+      "devDependencies": {
+        "@types/node": "^20.0.0",
+        "ts-node": "^10.9.0",
+        "typescript": "^5.0.0"
+      }
+    },
+    "../../packages/sdk": {
+      "name": "paypol-sdk",
+      "version": "1.0.2",
+      "license": "MIT",
+      "dependencies": {
+        "@paypol-protocol/aps-1": "^1.0.0",
+        "axios": "^1.13.5",
+        "express": "^4.21.0"
+      },
+      "devDependencies": {
+        "@types/express": "^5.0.0",
+        "@types/node": "^20.0.0",
+        "typescript": "^5.0.0"
+      }
+    },
+    "node_modules/@adraffy/ens-normalize": {
+      "version": "1.10.1",
+      "resolved": "https://registry.npmjs.org/@adraffy/ens-normalize/-/ens-normalize-1.10.1.tgz",
+      "integrity": "sha512-96Z2IP3mYmF1Xg2cDm8f1gWGf/HUVedQ3FMifV4kG/PQ4yEP51xDtRAEfhVNt5f/uzpNkZHwWQuUcu6D6K+Ekw==",
+      "license": "MIT"
+    },
+    "node_modules/@cspotcode/source-map-support": {
+      "version": "0.8.1",
+      "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz",
+      "integrity": "sha512-IchNf6dN4tHoMFIn/7OE8LWZ19Y6q/67Bmf6vnGREv8RSbBVb9LPJxEcnwrcwX6ixSvaiGoomAUvu4YSxXrVgw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/trace-mapping": "0.3.9"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@jridgewell/resolve-uri": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
+      "integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@jridgewell/sourcemap-codec": {
+      "version": "1.5.5",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
+      "integrity": "sha512-cYQ9310grqxueWbl+WuIUIaiUaDcj7WOq5fVhEljNVgRfOUhY9fy2zTvfoqWsnebh8Sl70VScFbICvJnLKB0Og==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@jridgewell/trace-mapping": {
+      "version": "0.3.9",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.9.tgz",
+      "integrity": "sha512-3Belt6tdc8bPgAtbcmdtNJlirVoTmEb5e2gC94PnkwEW9jI6CAHUeoG85tjWP5WquqfavoMtMwiG4P926ZKKuQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/resolve-uri": "^3.0.3",
+        "@jridgewell/sourcemap-codec": "^1.4.10"
+      }
+    },
+    "node_modules/@noble/curves": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/@noble/curves/-/curves-1.2.0.tgz",
+      "integrity": "sha512-oYclrNgRaM9SsBUBVbb8M6DTV7ZHRTKugureoYEncY5c65HOmRzvSiTE3y5CYaPYJA/GVkrhXEoF0M3Ya9PMnw==",
+      "license": "MIT",
+      "dependencies": {
+        "@noble/hashes": "1.3.2"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@noble/hashes": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.3.2.tgz",
+      "integrity": "sha512-MVC8EAQp7MvEcm30KWENFjgR+Mkmf+D189XJTkFIlwohU5hcBbn1ZkKq7KVTi2Hme3PMGF390DaL52beVrIihQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@tsconfig/node10": {
+      "version": "1.0.12",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node10/-/node10-1.0.12.tgz",
+      "integrity": "sha512-UCYBaeFvM11aU2y3YPZ//O5Rhj+xKyzy7mvcIoAjASbigy8mHMryP5cK7dgjlz2hWxh1g5pLw084E0a/wlUSFQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@tsconfig/node12": {
+      "version": "1.0.11",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node12/-/node12-1.0.11.tgz",
+      "integrity": "sha512-cqefuRsh12pWyGsIoBKJA9luFu3mRxCA+ORZvA4ktLSzIuCUtWVxGIuXigEwO5/ywWFMZ2QEGKWvkZG1zDMTag==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@tsconfig/node14": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node14/-/node14-1.0.3.tgz",
+      "integrity": "sha512-ysT8mhdixWK6Hw3i1V2AeRqZ5WfXg1G43mqoYlM2nc6388Fq5jcXyr5mRsqViLx/GJYdoL0bfXD8nmF+Zn/Iow==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@tsconfig/node16": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node16/-/node16-1.0.4.tgz",
+      "integrity": "sha512-vxhUy4J8lyeyinH7Azl1pdd43GJhZH/tP2weN8TntQblOY+A0XbT8DJk1/oCPuOOyg/Ja757rG0CgHcWC8OfMA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/node": {
+      "version": "20.19.34",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.19.34.tgz",
+      "integrity": "sha512-by3/Z0Qp+L9cAySEsSNNwZ6WWw8ywgGLPQGgbQDhNRSitqYgkgp4pErd23ZSCavbtUA2CN4jQtoB3T8nk4j3Rg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~6.21.0"
+      }
+    },
+    "node_modules/acorn": {
+      "version": "8.16.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.16.0.tgz",
+      "integrity": "sha512-UVJyE9MttOsBQIDKw1skb9nAwQuR5wuGD3+82K6JgJlm/Y+KI92oNsMNGZCYdDsVtRHSak0pcV5Dno5+4jh9sw==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
+    "node_modules/acorn-walk": {
+      "version": "8.3.5",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-8.3.5.tgz",
+      "integrity": "sha512-HEHNfbars9v4pgpW6SO1KSPkfoS0xVOM/9UzkJltjlsHZmJasxg8aXkuZa7SMf8vKGIBhpUsPluQSqhJFCqebw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "acorn": "^8.11.0"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
+    "node_modules/aes-js": {
+      "version": "4.0.0-beta.5",
+      "resolved": "https://registry.npmjs.org/aes-js/-/aes-js-4.0.0-beta.5.tgz",
+      "integrity": "sha512-G965FqalsNyrPqgEGON7nIx1e/OVENSgiEIzyC63haUMuvNnwIgIjMs52hlTCKhkBny7A2ORNlfY9Zu+jmGk1Q==",
+      "license": "MIT"
+    },
+    "node_modules/arg": {
+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/arg/-/arg-4.1.3.tgz",
+      "integrity": "sha512-58S9QDqG0Xx27YwPSt9fJxivjYl432YCwfDMfZ+71RAqUrZef7LrKQZ3LHLOwCS4FLNBplP533Zx895SeOCHvA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/create-require": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/create-require/-/create-require-1.1.1.tgz",
+      "integrity": "sha512-dcKFX3jn0MpIaXjisoRvexIJVEKzaq7z2rZKxf+MSr9TkdmHmsU4m2lcLojrj/FHl8mk5VxMmYA+ftRkP/3oKQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/diff": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-4.0.4.tgz",
+      "integrity": "sha512-X07nttJQkwkfKfvTPG/KSnE2OMdcUCao6+eXF3wmnIQRn2aPAHH3VxDbDOdegkd6JbPsXqShpvEOHfAT+nCNwQ==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">=0.3.1"
+      }
+    },
+    "node_modules/dotenv": {
+      "version": "16.6.1",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-16.6.1.tgz",
+      "integrity": "sha512-uBq4egWHTcTt33a72vpSG0z3HnPuIl6NqYcTrKEg2azoEyl2hpW0zqlxysq2pK9HlDIHyHyakeYaYnSAwd8bow==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://dotenvx.com"
+      }
+    },
+    "node_modules/ethers": {
+      "version": "6.16.0",
+      "resolved": "https://registry.npmjs.org/ethers/-/ethers-6.16.0.tgz",
+      "integrity": "sha512-U1wulmetNymijEhpSEQ7Ct/P/Jw9/e7R1j5XIbPRydgV2DjLVMsULDlNksq3RQnFgKoLlZf88ijYtWEXcPa07A==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/ethers-io/"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@adraffy/ens-normalize": "1.10.1",
+        "@noble/curves": "1.2.0",
+        "@noble/hashes": "1.3.2",
+        "@types/node": "22.7.5",
+        "aes-js": "4.0.0-beta.5",
+        "tslib": "2.7.0",
+        "ws": "8.17.1"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
+    "node_modules/ethers/node_modules/@types/node": {
+      "version": "22.7.5",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.7.5.tgz",
+      "integrity": "sha512-jML7s2NAzMWc//QSJ1a3prpk78cOPchGvXJsC3C6R6PSMoooztvRVQEz89gmBTBY1SPMaqo5teB4uNHPdetShQ==",
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~6.19.2"
+      }
+    },
+    "node_modules/ethers/node_modules/undici-types": {
+      "version": "6.19.8",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.19.8.tgz",
+      "integrity": "sha512-ve2KP6f/JnbPBFyobGHuerC9g1FYGn/F8n1LWTwNxCEzd6IfqTwUQcNXgEtmmQ6DlRrC1hrSrBnCZPokRrDHjw==",
+      "license": "MIT"
+    },
+    "node_modules/make-error": {
+      "version": "1.3.6",
+      "resolved": "https://registry.npmjs.org/make-error/-/make-error-1.3.6.tgz",
+      "integrity": "sha512-s8UhlNe7vPKomQhC1qFelMokr/Sc3AgNbso3n74mVPA5LTZwkB9NlXf4XPamLxJE8h0gh73rM94xvwRT2CVInw==",
+      "dev": true,
+      "license": "ISC"
+    },
+    "node_modules/paypol-sdk": {
+      "resolved": "../../packages/sdk",
+      "link": true
+    },
+    "node_modules/ts-node": {
+      "version": "10.9.2",
+      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-10.9.2.tgz",
+      "integrity": "sha512-f0FFpIdcHgn8zcPSbf1dRevwt047YMnaiJM3u2w2RewrB+fob/zePZcrOyQoLMMO7aBIddLcQIEK5dYjkLnGrQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@cspotcode/source-map-support": "^0.8.0",
+        "@tsconfig/node10": "^1.0.7",
+        "@tsconfig/node12": "^1.0.7",
+        "@tsconfig/node14": "^1.0.0",
+        "@tsconfig/node16": "^1.0.2",
+        "acorn": "^8.4.1",
+        "acorn-walk": "^8.1.1",
+        "arg": "^4.1.0",
+        "create-require": "^1.1.0",
+        "diff": "^4.0.1",
+        "make-error": "^1.1.1",
+        "v8-compile-cache-lib": "^3.0.1",
+        "yn": "3.1.1"
+      },
+      "bin": {
+        "ts-node": "dist/bin.js",
+        "ts-node-cwd": "dist/bin-cwd.js",
+        "ts-node-esm": "dist/bin-esm.js",
+        "ts-node-script": "dist/bin-script.js",
+        "ts-node-transpile-only": "dist/bin-transpile.js",
+        "ts-script": "dist/bin-script-deprecated.js"
+      },
+      "peerDependencies": {
+        "@swc/core": ">=1.2.50",
+        "@swc/wasm": ">=1.2.50",
+        "@types/node": "*",
+        "typescript": ">=2.7"
+      },
+      "peerDependenciesMeta": {
+        "@swc/core": {
+          "optional": true
+        },
+        "@swc/wasm": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/tslib": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.7.0.tgz",
+      "integrity": "sha512-gLXCKdN1/j47AiHiOkJN69hJmcbGTHI0ImLmbYLHykhgeN0jVGola9yVjFgzCUklsZQMW55o+dW7IXv3RCXDzA==",
+      "license": "0BSD"
+    },
+    "node_modules/typescript": {
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/undici-types": {
+      "version": "6.21.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
+      "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/v8-compile-cache-lib": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache-lib/-/v8-compile-cache-lib-3.0.1.tgz",
+      "integrity": "sha512-wa7YjyUGfNZngI/vtK0UHAN+lgDCxBPCylVXGp0zu59Fz5aiGtNXaq3DhIov063MorB+VfufLh3JlF2KdTK3xg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/ws": {
+      "version": "8.17.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.17.1.tgz",
+      "integrity": "sha512-6XQFvXTkbfUOZOKKILFG1PDK2NDQs4azKQl26T0YS5CxqWLgXajbPZ+h4gZekJyRqFU8pvnbAbbs/3TgRPy+GQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    }
+  }
+}
diff --git a/agents/gas-estimator/package.json b/agents/gas-estimator/package.json
new file mode 100644
index 0000000..aa0c4ec
--- /dev/null
+++ b/agents/gas-estimator/package.json
@@ -0,0 +1,23 @@
+{
+  "name": "paypol-gas-estimator-agent",
+  "version": "1.0.0",
+  "description": "Multi-chain gas estimation agent for Tempo, Ethereum, Arbitrum, and Base",
+  "main": "dist/index.js",
+  "scripts": {
+    "build": "tsc",
+    "dev": "npx ts-node src/index.ts",
+    "start": "node dist/index.js",
+    "register": "npx ts-node src/register.ts"
+  },
+  "author": "sungdark",
+  "dependencies": {
+    "dotenv": "^16.4.0",
+    "ethers": "^6.13.0",
+    "paypol-sdk": "^1.0.2"
+  },
+  "devDependencies": {
+    "@types/node": "^20.0.0",
+    "ts-node": "^10.9.0",
+    "typescript": "^5.0.0"
+  }
+}
diff --git a/agents/gas-estimator/src/index.ts b/agents/gas-estimator/src/index.ts
new file mode 100644
index 0000000..4aabc21
--- /dev/null
+++ b/agents/gas-estimator/src/index.ts
@@ -0,0 +1,149 @@
+import 'dotenv/config';
+import { ethers } from 'ethers';
+import { PayPolAgent, JobRequest, JobResult } from 'paypol-sdk';
+
+type Op = 'transfer' | 'erc20_transfer' | 'contract_deploy';
+
+type ChainCfg = {
+  name: string;
+  slug: string;
+  rpcUrl: string;
+  tokenSymbol: string;
+  tokenUsd?: number;
+  speed: string;
+};
+
+const OPS: Record<Op, number> = {
+  transfer: 21_000,
+  erc20_transfer: 65_000,
+  contract_deploy: 1_200_000,
+};
+
+const CHAINS: ChainCfg[] = [
+  { name: 'Tempo L1', slug: 'tempo', rpcUrl: process.env.TEMPO_RPC_URL ?? 'https://rpc.moderato.tempo.xyz', tokenSymbol: 'TEMPO', tokenUsd: Number(process.env.TEMPO_TOKEN_USD ?? 0), speed: '2s' },
+  { name: 'Ethereum', slug: 'ethereum', rpcUrl: process.env.ETHEREUM_RPC_URL ?? 'https://ethereum-rpc.publicnode.com', tokenSymbol: 'ETH', speed: '12s' },
+  { name: 'Arbitrum', slug: 'arbitrum', rpcUrl: process.env.ARBITRUM_RPC_URL ?? 'https://arbitrum-one-rpc.publicnode.com', tokenSymbol: 'ETH', speed: '2s' },
+  { name: 'Base', slug: 'base', rpcUrl: process.env.BASE_RPC_URL ?? 'https://base-rpc.publicnode.com', tokenSymbol: 'ETH', speed: '2s' },
+];
+
+const CACHE_TTL_MS = Number(process.env.CACHE_TTL_MS ?? 15_000);
+let cache: { at: number; value: any } | null = null;
+
+const agent = new PayPolAgent({
+  id: 'gas-estimation-agent',
+  name: 'Gas Estimation Agent',
+  description: 'Compares gas costs across Tempo L1, Ethereum, Arbitrum, and Base with USD estimates and cheapest-chain recommendation.',
+  category: 'analytics',
+  version: '1.0.0',
+  price: 6,
+  capabilities: ['gas-estimation', 'multichain-comparison', 'cost-optimization'],
+  author: process.env.GITHUB_HANDLE ?? 'community',
+});
+
+async function fetchEthUsd(): Promise<number> {
+  const url = process.env.COINGECKO_URL ?? 'https://api.coingecko.com/api/v3/simple/price?ids=ethereum&vs_currencies=usd';
+  const res = await fetch(url);
+  if (!res.ok) throw new Error(`price fetch failed: ${res.status}`);
+  const json = await res.json() as any;
+  const price = Number(json?.ethereum?.usd);
+  if (!Number.isFinite(price) || price <= 0) throw new Error('invalid ETH/USD');
+  return price;
+}
+
+async function getGasGwei(chain: ChainCfg): Promise<number> {
+  const provider = new ethers.JsonRpcProvider(chain.rpcUrl);
+  const fee = await provider.getFeeData();
+  const wei = fee.gasPrice ?? fee.maxFeePerGas;
+  if (!wei) throw new Error('missing gas price');
+  return Number(ethers.formatUnits(wei, 'gwei'));
+}
+
+function opLabel(op: Op): string {
+  if (op === 'transfer') return 'Simple Transfer';
+  if (op === 'erc20_transfer') return 'ERC-20 Transfer';
+  return 'Contract Deploy';
+}
+
+agent.onJob(async (job: JobRequest): Promise<JobResult> => {
+  const start = Date.now();
+  try {
+    const payload = (job.payload ?? {}) as any;
+    const op = (payload.operation ?? 'erc20_transfer') as Op;
+    const operation = OPS[op] ? op : 'erc20_transfer';
+    const gasUnits = OPS[operation];
+
+    if (cache && Date.now() - cache.at < CACHE_TTL_MS && cache.value?.operation === operation) {
+      return { jobId: job.jobId, agentId: job.agentId, status: 'success', result: { ...cache.value, cache: 'hit' }, executionTimeMs: Date.now() - start, timestamp: Date.now() };
+    }
+
+    let ethUsd = 0;
+    try { ethUsd = await fetchEthUsd(); } catch { ethUsd = 0; }
+
+    const estimates = await Promise.all(CHAINS.map(async (chain) => {
+      try {
+        const gasPrice = await getGasGwei(chain);
+        const tokenUsd = chain.tokenSymbol === 'ETH' ? ethUsd : (chain.tokenUsd ?? 0);
+        const costNative = gasPrice * 1e-9 * gasUnits;
+        const costUsd = costNative * tokenUsd;
+
+        return {
+          chain: chain.name,
+          gasPrice: `${gasPrice.toFixed(4)} gwei`,
+          gasUnits,
+          costNative: `${costNative.toFixed(8)} ${chain.tokenSymbol}`,
+          cost: `$${costUsd.toFixed(4)}`,
+          speed: chain.speed,
+          status: 'ok',
+        };
+      } catch (err: any) {
+        return {
+          chain: chain.name,
+          gasPrice: 'n/a',
+          gasUnits,
+          costNative: 'n/a',
+          cost: 'n/a',
+          speed: chain.speed,
+          status: `rpc_error: ${err.message}`,
+        };
+      }
+    }));
+
+    const valid = estimates.filter((e) => e.status === 'ok' && e.cost !== 'n/a');
+    const cheapest = valid
+      .map((e) => ({ chain: e.chain, usd: Number(e.cost.slice(1)) }))
+      .sort((a, b) => a.usd - b.usd)[0];
+
+    const result = {
+      operation: opLabel(operation),
+      estimates,
+      recommendation: cheapest
+        ? `${cheapest.chain} is currently the cheapest for ${opLabel(operation)}.`
+        : 'No chain estimates available right now due to RPC errors.',
+      timestamp: new Date().toISOString(),
+      cacheTtlMs: CACHE_TTL_MS,
+      cache: 'miss',
+      notes: [
+        'Tempo USD conversion uses TEMPO_TOKEN_USD env (default 0).',
+        'ETH/USD is shared by Ethereum, Arbitrum, and Base.',
+      ],
+    };
+
+    cache = { at: Date.now(), value: { ...result, operation } };
+
+    return {
+      jobId: job.jobId,
+      agentId: job.agentId,
+      status: 'success',
+      result,
+      executionTimeMs: Date.now() - start,
+      timestamp: Date.now(),
+    };
+  } catch (err: any) {
+    return { jobId: job.jobId, agentId: job.agentId, status: 'error', error: err.message ?? String(err), executionTimeMs: Date.now() - start, timestamp: Date.now() };
+  }
+});
+
+const PORT = Number(process.env.AGENT_PORT ?? 3016);
+agent.listen(PORT, () => {
+  console.log(`[gas-estimation-agent] ready on :${PORT}`);
+});
diff --git a/agents/gas-estimator/src/register.ts b/agents/gas-estimator/src/register.ts
new file mode 100644
index 0000000..9095eef
--- /dev/null
+++ b/agents/gas-estimator/src/register.ts
@@ -0,0 +1,32 @@
+import 'dotenv/config';
+import { registerAgent } from 'paypol-sdk';
+
+async function main() {
+  const webhookUrl = process.env.AGENT_WEBHOOK_URL ?? 'http://localhost:3016';
+  const ownerWallet = process.env.OWNER_WALLET;
+  const githubHandle = process.env.GITHUB_HANDLE;
+  const marketplaceUrl = process.env.PAYPOL_MARKETPLACE_URL ?? 'http://localhost:3000';
+
+  if (!ownerWallet) throw new Error('OWNER_WALLET is required');
+
+  const result = await registerAgent({
+    id: 'gas-estimation-agent',
+    name: 'Gas Estimation Agent',
+    description: 'Compares gas costs across Tempo L1, Ethereum, Arbitrum, and Base and recommends cheapest execution route.',
+    category: 'analytics',
+    version: '1.0.0',
+    price: 6,
+    capabilities: ['gas-estimation', 'multichain-comparison', 'cost-optimization'],
+    webhookUrl,
+    ownerWallet,
+    githubHandle,
+    author: githubHandle ?? 'community',
+  }, marketplaceUrl);
+
+  console.log(result);
+}
+
+main().catch((err) => {
+  console.error(err.message ?? err);
+  process.exit(1);
+});
diff --git a/agents/gas-estimator/tsconfig.json b/agents/gas-estimator/tsconfig.json
new file mode 100644
index 0000000..170ac05
--- /dev/null
+++ b/agents/gas-estimator/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "compilerOptions": { "target": "ES2022", "module": "commonjs", "lib": ["ES2022"], "outDir": "dist", "rootDir": "src", "strict": false, "esModuleInterop": true, "skipLibCheck": true, "forceConsistentCasingInFileNames": true, "resolveJsonModule": true, "declaration": true, "sourceMap": true },
+  "include": ["src"], "exclude": ["node_modules", "dist"]
+}