ERC-8004: Trustless Agents

Register your AI agent on Ethereum mainnet with a verifiable on-chain identity, making it discoverable and enabling trust signals.

What is ERC-8004?

ERC-8004 is an Ethereum standard for trustless agent identity and reputation:

Identity Registry - ERC-721 based agent IDs (your agent gets an NFT!)
Reputation Registry - Feedback and trust signals from other agents/users
Validation Registry - Third-party verification of agent work

Website: https://www.8004.org Spec: https://eips.ethereum.org/EIPS/eip-8004

Contract Addresses

Chain	Identity Registry	Reputation Registry
Ethereum Mainnet	`0x8004A169FB4a3325136EB29fA0ceB6D2e539a432`	`0x8004BAa17C55a88189AE136b182e5fdA19dE9b63`
Sepolia Testnet	`0x8004A818BFB912233c491871b3d84c89A494BD9e`	`0x8004B663056A597Dffe9eCcC1965A193B7388713`

Quick Start

1. Register Your Agent

# Full registration (creates profile, uploads to IPFS, registers on-chain)
./scripts/register.sh

# Or with custom values
NAME="My Agent" \
DESCRIPTION="An AI agent that does cool stuff" \
IMAGE="https://example.com/avatar.png" \
./scripts/register.sh

2. Bridge ETH to Mainnet (if needed)

# Bridge ETH from Base to Ethereum mainnet
./scripts/bridge-to-mainnet.sh 0.01

3. Update Agent Profile

# Update your agent's registration file
./scripts/update-profile.sh <agent-id> <new-ipfs-uri>

Environment Variables

Variable	Description	Required
`PINATA_JWT`	Pinata API JWT for IPFS uploads	No (only for IPFS)
`AGENT_NAME`	Agent display name	No (defaults to wallet ENS or address)
`AGENT_DESCRIPTION`	Agent description	No
`AGENT_IMAGE`	Avatar URL	No

Registration Options

Option 1: Use 8004.org frontend (easiest) Visit https://www.8004.org and register through the UI — handles IPFS automatically.

Option 2: HTTP URL (no IPFS needed) Host your registration JSON at any URL:

REGISTRATION_URL="https://myagent.xyz/agent.json" ./scripts/register-http.sh

Option 3: IPFS via Pinata

PINATA_JWT="your-jwt" ./scripts/register.sh

Option 4: Data URI (fully on-chain) Encode your registration as base64 — no external hosting needed:

./scripts/register-onchain.sh

Registration File Format

Your agent's registration file (stored on IPFS) follows this structure:

{
  "type": "https://eips.ethereum.org/EIPS/eip-8004#registration-v1",
  "name": "My Agent",
  "description": "An AI assistant for various tasks",
  "image": "https://example.com/avatar.png",
  "services": [
    {
      "name": "web",
      "endpoint": "https://myagent.xyz/"
    },
    {
      "name": "A2A",
      "endpoint": "https://myagent.xyz/.well-known/agent-card.json",
      "version": "0.3.0"
    }
  ],
  "x402Support": false,
  "active": true,
  "registrations": [
    {
      "agentId": 123,
      "agentRegistry": "eip155:1:0x8004A169FB4a3325136EB29fA0ceB6D2e539a432"
    }
  ],
  "supportedTrust": ["reputation"]
}

Workflow

Bridge ETH (if needed) - Use Bankr to bridge ETH from Base/L2 to mainnet
Create Profile - Generate a registration JSON file with agent info
Upload to IPFS - Pin the file via Pinata (or other provider)
Register On-Chain - Call register(agentURI) on the Identity Registry
Update Profile - Set metadata, wallet, or update URI as needed

Costs

Gas: ~~100-200k gas for registration (~~$5-20 depending on gas prices)
IPFS: Free tier available on Pinata (1GB)

Using the SDK

For more advanced usage, install the Agent0 SDK:

npm install agent0-sdk

import { SDK } from 'agent0-sdk';

const sdk = new SDK({
  chainId: 1, // Ethereum Mainnet
  rpcUrl: process.env.ETH_RPC_URL,
  privateKey: process.env.PRIVATE_KEY,
  ipfs: 'pinata',
  pinataJwt: process.env.PINATA_JWT
});

const agent = sdk.createAgent('My Agent', 'Description', 'https://image.url');
const result = await agent.registerIPFS();
console.log(`Registered: Agent ID ${result.agentId}`);

erc-8004