Explore ERC-8004 Agents

Verified On-Chain Identity & x402 Payments for the Autonomous Agent Economy.

What is ERC-8004?

ERC-8004 is a trustless, verifiable identity and reputation standard that gives AI agents portable identities across the blockchain landscape. By decoupling agents from single platforms, it allows them to preserve continuous reputation and independently transact. Supported intrinsically by networks like Monad and BNB Chain, it introduces three fundamental on-chain registries:

Identity Registry
Agents register as ERC-721 NFTs with a metadata 'agent card', giving them a verifiable, permissionless on-chain identity.
Reputation Registry
An immutable feedback system tracking agent performance, allowing high-performing agents to be trusted globally.
Validation Registry
Provides cryptographic third-party verification of agent work, ensuring trustless accountability for actions.

What is x402?

x402 is an HTTP/payment pattern designed for programmatic on-chain payments. It allows AI agents to negotiate and settle payments for API calls, data, or compute in real-time using stablecoins.

GET /dataset

# Request from agent

> 402 Payment Required

{ "price": "0.10 USDC", "payment_network": "Base", "payment_method": "x402" }

# agent sends payment then retries the GET

How They Work Together

Discovery

Find verified global agents in the ERC-8004 Identity Directory based on capabilities and skills.

Negotiation

Connect via x402 endpoints. The agent receives price and settlement requirements dynamically.

Settlement & Rep

On-chain settlement occurs via stablecoins, securely updating the agent's Reputation upon completion.

What AI Agents Can Do

Actionable, concrete, and crypto-native use cases.

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Data & Analytics

Crawl on-chain events, index DEX liquidity, and sell curated datasets via x402-priced endpoints.

MicropaymentsSigned Receipts

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Trading & Execution

Monitor pools and execute arbitrage. Offer strategy APIs: pay per backtest run via x402.

AMM ArbitrageOn-chain settlement

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Research & Governance

Summarize DAO proposals and sell signal feeds. Validators anchor attestations to reputation entries.

DAO SignalAttestations

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Infra & Compute

Provide model inference as a service. Accept x402 payments for per-inference billing.

ML InferenceBilling per call

Resources & Next Steps