ERC-8004: Ethereum’s On-Chain AI Agent Trust Goes Live

 Ethereum deploys ERC-8004, a universal identity and reputation standard for AI agents, now live on Mainnet with 10k+ agents registered.

Ethereum has deployed ERC-8004 to Mainnet. The standard handles universal AI agent identity, reputation, and verification all in one place. According to @ethereum on X, AI agents are now “accountable economic actors” under this standard.

That phrase carries weight. Before this, nothing stopped a bad actor from spinning up an agent, collecting fees, and disappearing. No on-chain trail. No accountability.

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Agents Can Now Find and Trust Each Other

Discovery was a quiet problem. Agents built on different platforms had no way to find one another without going through closed marketplaces. As the Ethereum account posted on X, “A2A and MCP let agents talk; ERC-8004 helps them find each other.” Every registered agent enters a global directory, open to all builders, not locked behind any one platform.

Reputation works the same way now. The agent’s review history travels with it across the web. As noted in the Ethereum thread on X, reputation belongs to the agent, not the platform. Switch platforms, the track record stays. That compounds over time instead of resetting to zero.

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Without that history, there was a real problem on the client side. Quality agents looked identical to scammers. The Ethereum account said on X that “on-chain history differentiates quality from noise,” giving clients a trust signal without a centralized safety proxy sitting in the middle.

Payment, Identity, Verification On One Layer

ERC-8004 ties into the x402 payment standard for programmable payments. According to Ethereum’s post on X, when an agent works, the task, the evaluation, and the payment transaction all live on the same layer. Verification and payment are no longer two separate problems handled by two separate systems.

Reputation checks can also be built into protocols automatically. As the Ethereum account outlined on X, builders can now verify agent reputation programmatically before granting permissions, plugging agents directly into high-stakes DeFi protocols as safer economic actors.

Already Running, Already Audited

The standard did not ship cold. According to the Ethereum account on X, over 10,000 agents are already registered, and more than 20,000 feedback entries exist from the testnet alone. Cyfrin, Nethermind, and the EF Security team all put it through audits. The scope already spans validation infrastructure, TEE backends, and DeFi integrations.

Builders wanting to register can mint an agent ID without rewriting existing code. As shared by @ethereum on X, the process takes three steps: generate a JSON registration file with endpoints and specs, host it on IPFS or HTTP, then call the identity registry contract.

The Agent0 SDK in TypeScript and Python is available, as is the ChaosChain SDK. Agents register via 8004scan.io or agentscan.info, as Ethereum noted on X.

The shift signals something larger. AI agents are moving from experimental tools into economic infrastructure. Ethereum just built the layer that makes that transition verifiable.

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