/erc-8004

name: erc-8004
description: Build with ERC-8004 Trustless Agents - on-chain agent identity, reputation, validation, and discovery on EVM chains. Use when registering agents on-chain, building agent reputation, or using the Agent0 SDK. Triggers on ERC-8004 and Agent0.
metadata:
  version: "0.2.4"
  categories: "development, agents"
  topics: "erc-8004, ethereum, smart-contracts, agent-identity, onchain-reputation"
  openclaw:
    homepage: https://github.com/tenequm/skills/tree/main/skills/erc-8004
    emoji: "🤝"
    primaryEnv: PRIVATE_KEY
    envVars:
      - name: RPC_URL
        required: false
        description: EVM JSON-RPC endpoint for the registry chain.
      - name: PRIVATE_KEY
        required: false
        description: Signer key for on-chain registration. Use throwaway/testnet keys.
      - name: PINATA_JWT
        required: false
        description: JWT for IPFS pinning via Pinata.

ERC-8004: Trustless Agents

ERC-8004 is a Draft EIP for discovering, choosing, and interacting with AI agents across organizational boundaries without pre-existing trust. It defines three on-chain registries deployed as per-chain singletons on any EVM chain.

**Authors:** Marco De Rossi (MetaMask), Davide Crapis (EF), Jordan Ellis (Google), Erik Reppel (Coinbase)

**Full spec:** [references/spec.md](references/spec.md)

When to Use This Skill

• Registering AI agents on-chain (ERC-721 identity)
• Building or querying agent reputation/feedback systems
• Searching and discovering agents by capabilities, trust models, or endpoints
• Working with the Agent0 TypeScript SDK (`agent0-sdk`)
• Implementing ERC-8004 smart contract integrations
• Setting up agent wallets, MCP/A2A endpoints, or OASF taxonomies

Core Architecture

Three lightweight registries, each deployed as a UUPS-upgradeable singleton:

| Registry | Purpose | Contract | |----------|---------|----------| | **Identity** | ERC-721 NFTs for agent identities + registration files | `IdentityRegistryUpgradeable` | | **Reputation** | Signed fixed-point feedback signals + off-chain detail files | `ReputationRegistryUpgradeable` | | **Validation** | Third-party validator attestations (stake, zkML, TEE) | `ValidationRegistryUpgradeable` |

**Agent identity** = `agentRegistry` (string `eip155:{chainId}:{contractAddress}`) + `agentId` (ERC-721 tokenId).

Each agent's `agentURI` points to a JSON registration file (IPFS or HTTPS) advertising name, description, endpoints (MCP, A2A, ENS, DID, wallet), OASF skills/domains, trust models, and x402 support.

**See:** [references/contracts.md](references/contracts.md) for full contract interfaces and addresses.

Quick Start with Agent0 SDK (TypeScript)

npm install agent0-sdk

Register an Agent

`RPC_URL`, `PRIVATE_KEY`, and `PINATA_JWT` are declared in this skill's `metadata.openclaw.envVars`. Use throwaway/testnet keys for development; reach for a hardware wallet or scoped signer for any mainnet activity.

import { SDK } from 'agent0-sdk';

const sdk = new SDK({
  chainId: 84532,  // Base Sepolia
  rpcUrl: process.env.RPC_URL,
  privateKey: process.env.PRIVATE_KEY,
  ipfs: 'pinata',
  pinataJwt: process.env.PINATA_JWT,
});

const agent = sdk.createAgent(
  'MyAgent',
  'An AI agent that analyzes crypto markets',
  'https://example.com/agent-image.png'
);

// Configure endpoints and capabilities
await agent.setMCP('https://mcp.example.com', '2025-06-18', true);  // auto-fetches tools
await agent.setA2A('https://example.com/.well-known/agent-card.json', '0.3.0', true);
agent.setENS('myagent.eth');
agent.setActive(true);
agent.setX402Support(true);
agent.setTrust(true, false, false);  // reputation only

// Add OASF taxonomy
agent.addSkill('natural_language_processing/natural_language_generation/summarization', true);
agent.addDomain('finance_and_business/investment_services', true);

// Register on-chain (mints NFT + uploads to IPFS).
// Sends a real transaction signed with PRIVATE_KEY - confirm chainId, signer, and balance before running.
const tx = await agent.registerIPFS();
const { result } = await tx.waitConfirmed();
console.log(`Registered: ${result.agentId}`);  // e.g. "84532:42"

Search for Agents

const sdk = new SDK({ chainId: 84532, rpcUrl: process.env.RPC_URL });

// Search by capabilities
const agents = await sdk.searchAgents({
  hasMCP: true,
  active: true,
  x402support: true,
  mcpTools: ['financial_analyzer'],
  supportedTrust: ['reputation'],
});

// Get a specific agent
const agent = await sdk.getAgent('84532:42');

// Semantic search
const results = await sdk.searchAgents(
  { keyword: 'crypto market analysis' },
  { sort: ['semanticScore:desc'] }
);

Give Feedback

// Prepare optional off-chain feedback file
const feedbackFile = await sdk.prepareFeedbackFile({
  text: 'Accurate market analysis',
  capability: 'tools',
  name: 'financial_analyzer',
  proofOfPayment: { txHash: '0x...', chainId: '8453', fromAddress: '0x...', toAddress: '0x...' },
});

// Submit feedback (value=85 out of 100). On-chain tx; same caveats as `registerIPFS()` above.
const tx = await sdk.giveFeedback('84532:42', 85, 'starred', '', '', feedbackFile);
await tx.waitConfirmed();

// Read reputation summary
const summary = await sdk.getReputationSummary('84532:42');
console.log(`Average: ${summary.averageValue}, Count: ${summary.count}`);

**See:** [references/sdk-typescript.md](references/sdk-typescript.md) for full SDK API reference.

Registration File Format

Every agent's `agentURI` resolves to this JSON structure:

{
  "type": "https://eips.ethereum.org/EIPS/eip-8004#registration-v1",
  "name": "MyAgent",
  "description": "What it does, pricing, interaction methods",
  "image": "https://example.com/agent.png",
  "services": [
    { "name": "MCP", "endpoint": "https://mcp.example.com", "version": "2025-06-18", "mcpTools": ["tool1"] },
    { "name": "A2A", "endpoint": "https://example.com/.well-known/agen