Sato Hub
← Back to directory
API / SDKActiveVerifiedActive · 24d ago

ERC-8004: Trustless Agents

Ethereum standard providing on-chain identity, reputation, and validation registries for AI agents.

Last commit Aug 15, 2026 · ★ 235

Website ↗Docs ↗GitHub ↗
Verified on-chainEthereum mainnet
0
agents registered
Read live from the AgentIdentity (AGENT) Identity Registry: 0x8004…a432 ↗.

Read directly from Ethereum mainnet (block 25,935,229) · Sep 8 · not self-reported

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

81/100· High

How open, active & verifiable — not a safety or returns grade.

Maintenance & liveness
35/35
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.

View verification & embed badge →How the Sato Score works

Observed record — 57 daily checks since 2026-07-14

100%of our checks succeeded
Currently responding for 57 days
Succeeded
57
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. 49 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. Rates spanning that date mix two definitions. Since then: 100%.

Measured on-chain — week 2026-W37

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.

Declared MCP endpoint answersERC-8004 Identity Registry · Arbitrum
unknownn=0 · too small to quoteIndicator
Registration file resolvesERC-8004 Identity Registry · Arbitrum
0%0n=48Indicator
RegisteredERC-8004 Identity Registry · Arbitrum
1,472Proof
New this windowERC-8004 Identity Registry · Arbitrum
238Proof
Distinct ownersERC-8004 Identity Registry · Arbitrum
95.3%102n=107Proof
FundedERC-8004 Identity Registry · Arbitrum
4n=4 · too small to quoteIndicator
Active beyond registeringERC-8004 Identity Registry · Arbitrum
4n=4 · too small to quoteIndicator
In ongoing useERC-8004 Identity Registry · Arbitrum
3n=4 · too small to quoteInference
Declares an MCP endpointERC-8004 Identity Registry · Arbitrum
unknownn=0 · too small to quoteIndicator
Declares an A2A cardERC-8004 Identity Registry · Arbitrum
unknownn=0 · too small to quoteIndicator
In ongoing useERC-8004 Identity Registry · Avalanche
unknownn=0 · too small to quoteInference
Active beyond registeringERC-8004 Identity Registry · Avalanche
unknownn=0 · too small to quoteIndicator
New this windowERC-8004 Identity Registry · Avalanche
17Proof
RegisteredERC-8004 Identity Registry · Avalanche
1,815Proof
Distinct ownersERC-8004 Identity Registry · Avalanche
0n=0 · too small to quoteProof
FundedERC-8004 Identity Registry · Avalanche
unknownn=0 · too small to quoteIndicator
Distinct feedback client wallets (sample floor)ERC-8004 Identity Registry · Base
3.3%2n=60Indicator
Feedback left by the 5 most active client walletsERC-8004 Identity Registry · Base
100n=13 · too small to quoteIndicator
Sampled agents with any feedbackERC-8004 Identity Registry · Base
5.5%3.3n=60Indicator
Declares an MCP endpointERC-8004 Identity Registry · Base
22.3%6.7n=30Indicator
RegisteredERC-8004 Identity Registry · Base
85,106Proof
New this windowERC-8004 Identity Registry · Base
24,130Proof
Distinct ownersERC-8004 Identity Registry · Base
50.4%121n=240Proof
FundedERC-8004 Identity Registry · Base
100%87n=87Indicator
Active beyond registeringERC-8004 Identity Registry · Base
86.2%75n=87Indicator
In ongoing useERC-8004 Identity Registry · Base
66.7%58n=87Inference
Declared MCP endpoint answersERC-8004 Identity Registry · Base
0n=2 · too small to quoteIndicator
Declares an A2A cardERC-8004 Identity Registry · Base
222.3%66.7n=30Indicator
Registration file resolvesERC-8004 Identity Registry · Base
178.5%73.2n=41Indicator
Registration file resolvesERC-8004 Identity Registry · BNB Chain
100n=4 · too small to quoteIndicator
Active beyond registeringERC-8004 Identity Registry · BNB Chain
15n=15 · too small to quoteIndicator
In ongoing useERC-8004 Identity Registry · BNB Chain
2n=15 · too small to quoteInference
Declares an A2A cardERC-8004 Identity Registry · BNB Chain
0n=4 · too small to quoteIndicator
Declares an MCP endpointERC-8004 Identity Registry · BNB Chain
0n=4 · too small to quoteIndicator
Declared MCP endpoint answersERC-8004 Identity Registry · BNB Chain
unknownn=0 · too small to quoteIndicator
RegisteredERC-8004 Identity Registry · BNB Chain
338,483Proof
New this windowERC-8004 Identity Registry · BNB Chain
unknownProof
Distinct ownersERC-8004 Identity Registry · BNB Chain
80%16n=20Proof
FundedERC-8004 Identity Registry · BNB Chain
14n=15 · too small to quoteIndicator
Sampled agents with any feedbackERC-8004 Identity Registry · Ethereum
0n=1 · too small to quoteIndicator
Distinct ownersERC-8004 Identity Registry · Ethereum
unknownn=0 · too small to quoteProof
New this windowERC-8004 Identity Registry · Ethereum
2,521Proof
Feedback left by the 5 most active client walletsERC-8004 Identity Registry · Ethereum
unknownn=0 · too small to quoteIndicator
Distinct feedback client wallets (sample floor)ERC-8004 Identity Registry · Ethereum
0n=1 · too small to quoteIndicator
RegisteredERC-8004 Identity Registry · Ethereum
50,727Proof
In ongoing useERC-8004 Identity Registry · Ethereum
unknownn=0 · too small to quoteProof
Active beyond registeringERC-8004 Identity Registry · Ethereum
unknownn=0 · too small to quoteProof
FundedERC-8004 Identity Registry · Ethereum
unknownn=0 · too small to quoteProof
Distinct feedback client wallets (sample floor)ERC-8004 Identity Registry · Gnosis
0n=19 · too small to quoteIndicator
RegisteredERC-8004 Identity Registry · Gnosis
4,127Proof
New this windowERC-8004 Identity Registry · Gnosis
19Proof
Distinct ownersERC-8004 Identity Registry · Gnosis
2n=19 · too small to quoteProof
FundedERC-8004 Identity Registry · Gnosis
1n=1 · too small to quoteIndicator
Active beyond registeringERC-8004 Identity Registry · Gnosis
1n=1 · too small to quoteIndicator
In ongoing useERC-8004 Identity Registry · Gnosis
0n=1 · too small to quoteInference
Registration file resolvesERC-8004 Identity Registry · Gnosis
100n=18 · too small to quoteIndicator
Declares an MCP endpointERC-8004 Identity Registry · Gnosis
33.3n=18 · too small to quoteIndicator
Declares an A2A cardERC-8004 Identity Registry · Gnosis
33.3n=18 · too small to quoteIndicator
Declared MCP endpoint answersERC-8004 Identity Registry · Gnosis
0n=6 · too small to quoteIndicator
Sampled agents with any feedbackERC-8004 Identity Registry · Gnosis
0n=19 · too small to quoteIndicator
Feedback left by the 5 most active client walletsERC-8004 Identity Registry · Gnosis
unknownn=0 · too small to quoteIndicator
FundedERC-8004 Identity Registry · Optimism
1n=1 · too small to quoteIndicator
Distinct ownersERC-8004 Identity Registry · Optimism
1n=3 · too small to quoteProof
New this windowERC-8004 Identity Registry · Optimism
5Proof
RegisteredERC-8004 Identity Registry · Optimism
542Proof
In ongoing useERC-8004 Identity Registry · Optimism
1n=1 · too small to quoteInference
Active beyond registeringERC-8004 Identity Registry · Optimism
1n=1 · too small to quoteIndicator
Declares an MCP endpointERC-8004 Identity Registry · Polygon
0n=1 · too small to quoteIndicator
Declares an A2A cardERC-8004 Identity Registry · Polygon
0n=1 · too small to quoteIndicator
Declared MCP endpoint answersERC-8004 Identity Registry · Polygon
unknownn=0 · too small to quoteIndicator
In ongoing useERC-8004 Identity Registry · Polygon
unknownn=0 · too small to quoteInference
Active beyond registeringERC-8004 Identity Registry · Polygon
unknownn=0 · too small to quoteIndicator
FundedERC-8004 Identity Registry · Polygon
unknownn=0 · too small to quoteIndicator
Distinct ownersERC-8004 Identity Registry · Polygon
0n=0 · too small to quoteProof
New this windowERC-8004 Identity Registry · Polygon
unknownProof
RegisteredERC-8004 Identity Registry · Polygon
637Proof
Registration file resolvesERC-8004 Identity Registry · Polygon
100n=1 · too small to quoteIndicator
In ongoing useERC-8004 Identity Registry · Tempo
unknownn=0 · too small to quoteInference
Active beyond registeringERC-8004 Identity Registry · Tempo
unknownn=0 · too small to quoteIndicator
FundedERC-8004 Identity Registry · Tempo
unknownn=0 · too small to quoteIndicator
Distinct ownersERC-8004 Identity Registry · Tempo
0n=0 · too small to quoteProof
New this windowERC-8004 Identity Registry · Tempo
0Proof
RegisteredERC-8004 Identity Registry · Tempo
289Proof

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-155from project docs · 2026-06-25
Last checked
2026-09-08

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.

#agent-identity#reputation#eip#standard#trustless#registry#ethereum#smart-contracts#identity-registry#reputation-registry

Where ERC-8004: Trustless Agents fits

TradingIdentity & Verification

Related concepts: How Agents Interact With Smart Contracts, How Agents Use Wallets, What Are Onchain Agents?

See something inaccurate or outdated?Submit a correction →

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.

  1. Jul 21, 2026
    Edited: onchain address
  2. Jul 20, 2026
    Edited: deploy spec
  3. Jun 25, 2026
    Enriched: creator name, tags, marketplace notes
  4. Jun 25, 2026
    Auto-enriched: chains supported, supported integrations
  5. Jun 11, 2026
    Sato Hub began tracking this listing

Related Resources

Model Context Protocol (MCP)

Active
Standard

Anthropic's open standard for connecting AI systems to external tools and data sources.

Unknown
Active

Olas (Autonolas)

Active
Framework

Network and framework for co-owned autonomous agent services operating onchain.

EthereumGnosisBaseMultichain
Active

Agent Payments Protocol (AP2)

Active
Tool/ServiceVerified

Open 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.

EthereumBaseMultichain
Quiet★ 2.9k

Is this your project?

Prove you control the domain and you can correct this page — description, links, tags, chains. Claiming proves control, not verification: it doesn't change the Sato Score or mark anything as audited.

Claim this listing →

Cite this page

Sato Hub. "ERC-8004: Trustless Agents — Sato Hub." Sato Hub, updated 2026-09-08, accessed 2026-09-08. https://satohub.ai/resources/erc-8004

This page is refreshed daily. Citations include the date so a reader can tell which snapshot a claim came from.

Join the Sato Hub Briefing

One email a week — the agents, tools, and infrastructure that actually shipped, and why they matter.