# ERC-8004 Agent Registry: Registered AI Agents by Chain

> ERC-8004 agent registry: every registered AI agent by chain with its owner, registration date, agent URI and reputation feedback, read from registry events.

Markdown copy of https://voltfincrypto.com/apps/erc-8004-agent-registry

**Question:** How many AI agents are registered under ERC-8004, and which have the most feedback?

- Kind: Table in Voltfin Strata
- Topic: [AI and agents](https://voltfincrypto.com/topics/ai-agents)
- Chains: Multi-chain, Ethereum, Base, Arbitrum, Polygon, Celo
- Status: Planned. The data is not published yet, so this page states no figure; each figure will open its receipt when it is.

ERC-8004, known as Trustless Agents, gives AI agents an on-chain identity and a place to collect reputation. An identity registry mints each agent as an ERC-721 token that points to a registration file describing it, and a reputation registry lets clients leave feedback on the agents they used. This table lists every registered agent from those registries' events, chain by chain.

Registration is cheap and open, so the number of agents says little alone. Feedback, revocations and responses show which agents are actually used and rated, and by how many distinct clients, which is harder to manufacture than registrations.

Sort by feedback received or by registration date, filter by chain or owner and open any row to see the registration, transfer and feedback transactions behind it.

## Blueprint

One row: One row per registered agent per chain, on the latest complete day

- **Agent id** (`agent_id`): The agent's token id in that chain's identity registry.
- **Agent** (`agent_name`): The name in the agent's current registration file, or its id where the file gives none.
- **Chain** (`chain`): The chain whose identity registry minted this agent.
- **Owner** (`owner`): The address that owns the agent's identity token at the latest block.
- **Registered** (`registered`): The date of the agent's Registered event.
- **Registration file** (`agent_uri`): The agent's current URI, from its latest Registered or URIUpdated event.
- **Feedback** (`feedback_count`): NewFeedback events for this agent, net of revoked feedback.
- **Distinct clients** (`distinct_clients`): Distinct client addresses whose feedback for this agent was not revoked.
- **Last feedback** (`last_feedback`): The date of the agent's most recent feedback.
- **Receipt** (`receipt`): The blocks, hashes and logs behind the row.

## How it will be measured

- Agents come from Registered events of each chain's ERC-8004 identity registry, with the agent id, owner and agent URI; ownership then follows the registry's ERC-721 Transfer logs.
- URI and metadata changes are read from URIUpdated and MetadataSet events, so each row shows the agent's current registration file and when it last changed.
- Feedback counts come from the reputation registry's NewFeedback events per agent id, net of FeedbackRevoked events, with distinct client addresses counted separately.
- Registry addresses are confirmed per chain before they are read, and the validation registry is added once an official deployment exists.
- Every row carries a receipt: the block, its hash and the logs behind each figure.

## Data it needs

- `agent_payments_daily` (to build): Agent tokens (supply, holders, trading) and agent payments such as x402 settlements in stablecoins, per day.
- `address_labels` (to build): Labels for known addresses: exchanges, bridges, protocols, funds, treasuries, sanctioned addresses and known attackers.
- Source: ERC-8004 identity registry Registered events and ERC-721 Transfer logs, per chain
- Source: URIUpdated and MetadataSet events for agent URI and metadata changes
- Source: Reputation registry NewFeedback, FeedbackRevoked and ResponseAppended events per agent id
- Source: Validation registry request and response events once an official deployment exists
- Source: Registry deployment addresses, confirmed per chain

## Questions

### What is ERC-8004?

ERC-8004, Trustless Agents, is an Ethereum standard for discovering and trusting AI agents across organizations. It defines three registries: identity, where each agent is an ERC-721 token; reputation, where clients post feedback; and validation, where independent checks of an agent's work can be recorded.

### When did ERC-8004 launch on mainnet?

Its registries went live on Ethereum mainnet in January 2026 and have been deployed on other chains, including Base, at the same addresses. This table lists each chain where a deployment has been confirmed.

### How do I register an AI agent under ERC-8004?

The agent's owner calls the identity registry's register function with an agent URI that points to a registration file listing the agent's name, services, endpoints and supported trust models. The registry mints an ERC-721 token whose id is the agent id.

### Does ERC-8004 reputation feedback prove an agent is trustworthy?

No. Anyone can post feedback, so the registry records signals, not verdicts. The table shows feedback counts, distinct clients and revocations, which help separate many independent ratings from a few addresses rating each other.

### Is the agent registration file stored on-chain?

Usually not. The registry stores a URI on-chain, which can point to IPFS, a website or a data URI, and the file it points to can change. The table shows the current URI and when it last changed.

## Glossary

- **Identity registry**: The ERC-8004 contract that mints each agent as an ERC-721 token, with an agent URI pointing to its registration file.
- **Reputation registry**: The ERC-8004 contract where clients post feedback on agents they used; feedback can be revoked and answered.
- **Validation registry**: The ERC-8004 contract for recording independent checks of an agent's work, such as re-execution or proofs.
- **Agent URI**: The address of an agent's registration file, which lists its name, services, endpoints and the trust models it supports.

## Related apps

- [x402 Transactions Tracker: Daily Payments and Volume](https://voltfincrypto.com/apps/x402-transactions-tracker)
- [Virtuals Protocol Agents: Launches, Jobs and Payments](https://voltfincrypto.com/apps/virtuals-protocol-agents)
- [AI Agents in Crypto: Monthly On-Chain Report](https://voltfincrypto.com/apps/ai-agents-in-crypto-monthly-report)
- [x402 Facilitators and Paid Services Ranked](https://voltfincrypto.com/apps/x402-facilitators-ranking)
- [EIP-7702 Adoption: Delegated EOAs and Top Contracts](https://voltfincrypto.com/apps/eip-7702-adoption)
- [AI Agent Tokens Ranked by Holders and DEX Volume](https://voltfincrypto.com/apps/ai-agent-tokens-ranking)

Build it in Voltfin Studio: https://app.voltfincrypto.com/signup?next=%2F