Every API registered on RelAI now automatically receives an ERC-8004 agent NFT — a permanent, verifiable on-chain identity that tracks its real-world reputation.
What Is ERC-8004?
ERC-8004 is an emerging Ethereum standard for AI agent identity and reputation. It defines two on-chain registries:- IdentityRegistry — mints a non-transferable NFT representing the agent's identity, linked to a metadata URI describing its capabilities
- ReputationRegistry — records structured feedback over time: success rate, response time, and arbitrary tagged metrics
How RelAI Uses ERC-8004
When you publish an API on RelAI, the platform automatically:
- Mints an agent NFT on the IdentityRegistry (SKALE Base)
- Encodes rich metadata into the
agentURI— name, description, endpoint, category, tags, logo, website, and x402 payment support flag - Records reputation after every successful paid API call — success rate and response time are written on-chain via the ReputationRegistry
What Gets Recorded On-Chain
After each paid relay call, two feedback entries are submitted:
| Metric | Tag | Format |
|---|---|---|
| Success Rate | successRate | 0–100.00 (2 decimals, value 0–10000) |
| Response Time | responseTime | milliseconds (integer) |
Viewing Agent Stats
The On-chain Identity card is visible on every API's market page sidebar (for APIs that have a registered agent):
- Agent ID — the NFT token ID on the IdentityRegistry
- Owner — the wallet address that registered the agent
- Feedback Count — total number of on-chain feedback submissions
- Success Rate — rolling average across all recorded calls
- Response Time — rolling average in milliseconds
- Explorer link — direct link to the contract on SKALE Base explorer
For API Owners
What Does an Agent NFT Actually Do for You?
Credibility that doesn't depend on RelAI. Any client — human or AI — can verify on-chain that your API exists, is active, and has a real track record. They don't need to trust RelAI's database. The proof is on the blockchain. A reputation that builds itself. Every paid API call automatically increments your success rate and response time averages on-chain. You don't manage it — it just grows with usage. After a thousand calls, you have a thousand data points that no one can fake or delete. Discovery beyond RelAI. Because ERC-8004 is an open standard, other AI agents and tools can query the registry directly and find your API without going through the RelAI marketplace. Your agent NFT is a presence on the broader AI agent ecosystem, not just on relai.fi. Portable history. Your reputation lives on-chain, not in a private database. If you move, expand, or integrate with other platforms, the track record comes with you.What You Can Do From the Dashboard
- Register — mint your agent NFT in one click. Happens automatically for new APIs if ERC-8004 is enabled.
- Update on-chain — when you change your API's name, description, or endpoint, sync the update to the blockchain with the "Update on-chain" button in the ERC-8004 card.
Reading Your Agent's Reputation
// Look up by RelAI API ID (no auth required)
const response = await fetch('https://api.relai.fi/erc8004/agent-by-api/{apiId}')
const agent = await response.json()
console.log(agent.agentId) // "4"
console.log(agent.feedbackCount) // "42"
console.log(agent.reputation.successRate.average) // "10000" → 100.00%
console.log(agent.reputation.responseTime.average) // "312" → 312ms
ERC-8004 Is Going Multichain
ERC-8004 is no longer just an Ethereum standard. The ecosystem is expanding fast:
- Solana Foundation officially lists ERC-8004 as the basis for Solana Agent Registry — an on-chain identity, reputation, and validation infrastructure for AI agents on Solana, interoperable with ERC-8004 on Ethereum.
- 8004scan — the main explorer for ERC-8004 agents — launched Solana support on March 4, 2026, letting developers track registered agents, reputation signals, and validation records across networks.
- 8004 Market — a marketplace for discovering and interacting with registered agents, powered by on-chain identity and reputation scores.
What's Next
We're exploring surfacing agent reputation in the RelAI marketplace rankings and enabling third-party clients to query agent identity before initiating x402 payments — so trust becomes a first-class part of the API discovery experience.
RelAI is the gas-sponsoring facilitator for the x402 payment protocol. ERC-8004 agent identity is available now for all APIs published on relai.fi. RelAI also supports Solana Agent Registry — ERC-8004 compatible on-chain identity on Solana.
