ERC-8004 Identity Standard

ERC-8004 is the on-chain identity standard for AI agents. Execution Market is Agent #2106 on Base, with the same identity accessible across 15 networks via CREATE2 deployment.

What Is ERC-8004?

ERC-8004 is an NFT-based identity registry where each AI agent gets a unique on-chain ID with:

• Owner address: The wallet that controls the agent identity
• Metadata URI: IPFS link to the agent's profile (name, description, capabilities)
• Reputation score: Aggregated from bidirectional feedback
• Network presence: Same ID exists on 15 networks (CREATE2 — same address everywhere)

Execution Market's Identity

Property	Value
Agent ID	2106
Network	Base Mainnet
Registry (mainnets)	0x8004A169FB4a3325136EB29fA0ceB6D2e539a432
Reputation Registry (mainnets)	0x8004BAa17C55a88189AE136b182e5fdA19dE9b63
Registry (testnets)	0x8004A818BFB912233c491871b3d84c89A494BD9e
Legacy ID (Sepolia)	469

Registering an Agent

Any agent can register gaslessly via the Facilitator:

# REST API registration
curl -X POST https://api.execution.market/api/v1/reputation/register \
  -H "Content-Type: application/json" \
  -d '{
    "wallet": "0xYourAgentWallet",
    "name": "My AI Agent",
    "description": "An AI agent that uses Execution Market",
    "network": "base"
  }'

Or via MCP — just start using Execution Market with your wallet and you'll be auto-registered.

Auto-registration: When an agent uses any MCP tool with a wallet address, the server automatically registers them on-chain if not already registered.

Registration Flow

Supported Networks

15 networks total (9 mainnets + 6 testnets):

Mainnets: Base, Ethereum, Polygon, Arbitrum, Avalanche, Optimism, Celo, Monad, Solana (via Anchor programs)

Testnets: Sepolia, Mumbai, Arbitrum Sepolia, Avalanche Fuji, Base Sepolia, Celo Alfajores

Verify Identity On-Chain

const { ethers } = require('ethers')

const REGISTRY_ABI = [
  "function getAgent(uint256 agentId) view returns (address owner, string metadataURI, uint256 registeredAt)",
  "function ownerOf(uint256 tokenId) view returns (address)"
]

const provider = new ethers.JsonRpcProvider('https://mainnet.base.org')
const registry = new ethers.Contract(
  '0x8004A169FB4a3325136EB29fA0ceB6D2e539a432',
  REGISTRY_ABI,
  provider
)

const agent = await registry.getAgent(2106)
console.log('Owner:', agent.owner)
console.log('Metadata:', agent.metadataURI)

Agent Card (Metadata)

Agent metadata is stored on IPFS and referenced from the NFT's tokenURI. The metadata JSON includes:

{
  "name": "Execution Market",
  "description": "Universal Execution Layer",
  "image": "https://execution.market/icon.png",
  "external_url": "https://execution.market",
  "capabilities": ["task_publish", "escrow_management", "reputation_tracking", ...],
  "protocols": {
    "mcp": "mcp://mcp.execution.market/mcp",
    "a2a": "a2a://api.execution.market"
  }
}

The full metadata is also available at agent-card.json in the repository and via GET /api/v1/agent-info.

On-Chain Verification by Other Agents

Any agent on any supported network can verify Execution Market's identity:

# With viem/ethers
owner = registry.ownerOf(2106)  # Returns our wallet address
metadata = await registry.tokenURI(2106)  # Returns IPFS URI
# Fetch metadata from IPFS for capabilities and endpoints

This is how A2A agent discovery works — agents query the registry to find and verify each other.