ERC-8004: Trustless Agents
Ethereum standard providing on-chain identity, reputation, and validation registries for AI agents.
- Sato Score71
- ChainsEthereum, Multichain +2
ERC-8004: Trustless Agents is an open-source API or SDK by ERC-8004 Authors (Marco De Rossi, Davide Crapis, Jordan Ellis, Erik Reppel) on Ethereum, Base and Arbitrum, with last code activity on 2026-08-15 (Recent). Sato Score 71/100 (how open, active and verifiable it is, not a safety grade), as of 2026-10-23. How the score works →
See how to install ERC-8004: Trustless Agents →Last commit Aug 15, 2026 · ★ 239
Listed from eips.ethereum.org on 2026-06-08. Install: not attempted. Evidence →
Read directly from Ethereum mainnet (block 26,253,223) · Oct 23 · not self-reported
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Watch ERC-8004: Trustless Agents
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Claim this listing →Overview
ERC-8004 ('Trustless Agents') defines three on-chain registries: an Identity Registry (ERC-721-based portable identifiers), a Reputation Registry for standardized feedback, and a Validation Registry for cryptographic/economic verification of agent work. It is positioned as the trust layer for the open agent economy and is a companion to ERC-8183. Press reports cite large registration numbers (tens of thousands of agents within the first month of mainnet); such figures are self-reported/press-sourced and not independently verified here. Multiple reference implementations exist (e.g. ChaosChain, erc-8004/erc-8004-contracts).
Sato Score
71/100· HighHow open, active & verifiable — not a safety or returns grade.
- Maintenance & liveness
- 25/35
- Code transparency
- 19/20
- Interface verifiability
- 0/10
- Docs & demo
- 6/10
- Listing transparency & provenance
- 13/15
- Independent verification
- 8/10
Independently verified — listing reviewed against evidence, never self-reported.
Evidence — listed vs checked · what the words mean
Listed from eips.ethereum.org on 2026-06-08. Install: not attempted.
| Claim | Value | Evidence | Source | Checked |
|---|---|---|---|---|
| Chains supported | Ethereum, Multichain, Base, Arbitrum | self-reported | github.com/erc-8004/erc-8004-contracts | as of 2026-06-25 |
| Verification status | Verifiedreview date and evidence link not recorded on this listing | ✓ reviewed | — | not dated |
| Recent activity | last commit 2026-08-15 | observed | github.com/erc-8004/erc-8004-contracts | 2026-10-23 |
| Install works | documented by the project, not run by Sato Hubnot attempted: no falsifiable install+entry probe from deploy_spec | self-reported | github.com/erc-8004/erc-8004-contracts | as of 2026-09-14 |
| Website answers | answered (HTTP 200) | observed | eips.ethereum.org | 2026-10-23 |
| Daily check record | 90 of 90 daily checks since 2026-07-25 succeededa success rate of our checks, not uptime; the source is this listing's own history | observed | — | 2026-10-22 |
| ERC-8004 registration | declared address not found in the registry | observed | — | 2026-10-23 |
| Built by | ERC-8004 Authors (Marco De Rossi, Davide Crapis, Jordan Ellis, Erik Reppel)confidence 0.70 | self-reported | eips.ethereum.org | as of 2026-06-25 |
| Works with | EIP-721, EIP-712, EIP-1271, EIP-155confidence 0.80 | self-reported | eips.ethereum.org | as of 2026-06-25 |
| Tags | agent-identity, reputation, eip, standard, trustless, registry, ethereum, smart…confidence 0.70 | self-reported | github.com/erc-8004/erc-8004-contracts | as of 2026-06-25 |
| Sato Score | 71/100 (High)how open, active and verifiable — not a safety or quality grade | computed | satohub.ai | 2026-10-23 |
Self-reported rows are the project’s own words, dated when we recorded them — not a check. Only reproduced and reviewed rows carry a mark. None of these rows is a safety or quality rating.
Install — not run by us — no falsifiable install+entry probe from deploy_spec
Runtime: Node.js (Hardhat) — Solidity smart contracts
npm install npm test npx hardhat test contracts/IdentityRegistryUpgradeable.sol, ReputationRegistryUpgradeable.sol, ValidationRegistryUpgradeable.sol
You supply: Chain RPC endpoint (Hardhat network config) for deployment, Deployer private key for contract deployment (not required to run the test suite)
Read from the project’s own docs as of 2026-09-14. What a deploy spec is →
Observed record — 90 daily checks since 2026-07-26
- Succeeded
- 90
- Failed
- 0
- Their error
- 0
- Unattributed
- 0
This is the share of our daily checks that succeeded — not an availability guarantee. A check can fail because the host was down, because our runner timed out, or because the network in between dropped it, and only the first of those is a fact about this project. Failures are split by what we can attribute; anything we cannot attribute is counted, not hidden. 37 of these checks predate 2026-09-01, when the probe counted a bot-block (HTTP 403) as a failure and recorded no reason for any failure. Every one of them passed, so the rate covers them too.
Last 30 days — to 2026-10-23, one point per UTC day
A gap is a day we have no attributable observation — never a zero. Thirty points is the whole shape the free layer carries; the daily rows behind it stay in the snapshot series.
Measured on-chain — week 2026-W43
What we can observe about this project on-chain, from public reads, with the method and sample size attached to every figure. A raw deployment count is not an adoption figure and is shown separately below.
Rates on fewer than 20 observations are shown but not quotable. Full venue detail: ERC-8004 Identity Registry · The onchain agent economy.
Details
- Chains
- Ethereum, Multichain, Base, Arbitrum
- Agent types
- Identity Protocol, Reputation Protocol
- Open source
- Yes
- Pricing
- Free (open standard)
- Works with
- EIP-721, EIP-712, EIP-1271, EIP-155
- Last checked
- 2026-10-23
Marketplace Signals
No marketplace signals recorded for this resource yet.
Verification status reflects evidence reviewed by Sato Hub. Self-reported claims are never presented as verified.
Where ERC-8004: Trustless Agents fits
Related concepts: How Agents Interact With Smart Contracts, How Agents Use Wallets, What Are Onchain Agents?
Listing History
Recorded changes to ERC-8004: Trustless Agents's listing — status, verification, Sato Score, and recent releases. Full history is kept in the listing record.
- Jul 26, 2026Sato Hub began tracking this listing
- Jul 21, 2026Edited: onchain address
- Jul 20, 2026Edited: deploy spec
- Jun 25, 2026Enriched: creator name, tags, marketplace notes
- Jun 25, 2026Auto-enriched: chains supported, supported integrations
Compared with
Appears in
Related Resources
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Agent Payments Protocol (AP2)
ActiveOpen protocol from Google for secure agent-led payments across traditional and crypto rails, with a crypto-native x402 extension built with Coinbase, Ethereum Foundation, and MetaMask.
Reference
QuestionsWhat people ask about this pageShowHide
Questions people ask about ERC-8004: Trustless Agents
- Is ERC-8004: Trustless Agents open source?
- Yes. ERC-8004: Trustless Agents is open source under the CC0 license; the repository is https://github.com/erc-8004/erc-8004-contracts. Checked as of 2026-10-23.
- Which chains does ERC-8004: Trustless Agents support?
- ERC-8004: Trustless Agents lists support for Ethereum, Multichain, Base, Arbitrum as of 2026-10-23.
- Is ERC-8004: Trustless Agents still maintained?
- The most recent code activity Sato Hub observed was on 2026-08-15 (last commit 2026-08-15), which Sato Hub labels "Recent". Posts on X are not counted as maintenance. Activity is a recency signal, not a quality judgment.
- How do I install or run ERC-8004: Trustless Agents?
- Node.js (Hardhat) — Solidity smart contracts. Install: npm install && npm test && npx hardhat test. Entry: contracts/IdentityRegistryUpgradeable.sol, ReputationRegistryUpgradeable.sol, ValidationRegistryUpgradeable.sol. This is taken from the project's own documentation and has not been reproduced by Sato Hub.
- Is ERC-8004: Trustless Agents verified on Sato Hub?
- Sato Hub holds one earned check for ERC-8004: Trustless Agents: Independently verified — listing reviewed against evidence, never self-reported. Its Sato Score is 71 of 100, a measure of how open, active and verifiable the project is, not a safety, quality or returns grade.
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Cite this page
Sato Hub. "ERC-8004: Trustless Agents — Sato Hub." Sato Hub, updated 2026-10-23, accessed 2026-10-24. https://satohub.ai/resources/erc-8004Data last refreshed 2026-10-23; this page is rebuilt daily. Citations carry the date so a reader can tell which snapshot a claim came from. Catalog data is licensed CC-BY-4.0.
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