ERC-8004: Trustless Agents is an Ethereum standard designed to enable autonomous AI agents to discover, verify, and interact with each other across different organizations without needing prior trust relationships. Proposed in 2025 and co-authored by experts from MetaMask, Ethereum Foundation, Google, and Coinbase, it introduces three lightweight on-chain registries:Identity Registry — Gives each AI agent a unique, tamper-proof on-chain identity (using ERC-721-like NFTs) including name, description, image, and capabilities. Reputation Registry — Allows agents to build and track verifiable reputation scores based on past performance and validations. Validation Registry — Provides proofs that certain actions or results actually occurred, ensuring accountability. By extending protocols like Agent-to-Agent (A2A), ERC-8004 creates a decentralized trust layer for the emerging AI agent economy, making it possible for agents to hire each other, trade services, and collaborate openly and securely on Ethereum or compatible L2 networks.
The seven checks, with their evidence
7 recordedRegistered?rung 1 · registered
passThe agent exists in the on-chain registry, with an owner and a document URL.
passed
- block_number
- 25824613
- chain_id
- 1
- token_id
- 23054
checked at 2026-08-24T11:33:44.472208Z
Reachable?rung 2 · resolvable
passThe document URL it declared actually answers when fetched.
passed
- bytes
- 1390
- data_uri_variant
- base64
- inline
- true
- scheme
- data
- uri
- data:application/json;base64,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
checked at 2026-08-24T11:33:44.472208Z
Readable?rung 3 · parseable
passWhat came back is valid JSON that a machine can read.
passed
- body_bytes
- 1390
- body_sha256
- 368e1f862b33c000bb6ef206020cb95a0160309f86e55d2bcac7e494ab35bbf7
- content_type
- —
checked at 2026-08-24T11:33:44.472208Z
Follows the spec?rung 4 · conformant
passThe document meets what ERC-8004 requires of it.
passed
- both_fields_present
- false
- legacy_endpoints_field
- false
- may_gaps
- x402Support, supportedTrust
- must_violations
- (empty)
- registrations_checked
- 0
- services_field_source
- services
- services_status
- empty
- should_gaps
- services_empty, registrations
- spec_commit
- 68fc6765761a10fb26f0692df21c8a6f9d12b1be
checked at 2026-08-24T11:33:44.472208Z
Claims its identity?rung 5 · bound
unclaimedThe document names the on-chain agent it belongs to, rather than leaving it unsaid.
unclaimed — the document made no claim to check
- declared_agent_id
- —
- declared_chain
- —
- declared_registry
- —
- match
- —
- reason
- unclaimed
- registrations_seen
- 0
checked at 2026-08-24T11:33:44.472208Z
Answers?rung 6 · live
unprobeableA declared endpoint responds to a probe. Not implemented yet, so nobody passes or fails it.
unprobeable — no declared endpoint that a probe can reach
- endpoints
- (empty)
- endpoints_answered_not_live
- 0
- endpoints_declared
- 0
- endpoints_live
- 0
- endpoints_our_error
- 0
- endpoints_payment_gated
- 0
- endpoints_probeable
- 0
- endpoints_probed
- 0
- endpoints_refused
- 0
- kinds
- (empty)
- reason
- no_services_declared
checked at 2026-08-24T13:24:55.917314Z
Has feedback?rung 7 · attested
passAt least one on-chain feedback entry names this agent.
passed
- distinct_authors
- 1
- feedback_count
- 1
checked at 2026-08-24T11:33:44.472208Z
On-chain snapshot
mainnet- token id
- 23054
- owner
- 0xff879cc9c3ef14f60586c0846e4eaf785d5b8656
- block
- 25,824,613
- observed
- 2026-08-24T11:33:44.475209Z
What the fetch saw
data- scheme
- data
- request url
- —
- final url
- —
- http status
- —
- content type
- —
- size
- 1,390 bytes
- sha256
- 368e1f862b33c000bb6ef206020cb95a0160309f86e55d2bcac7e494ab35bbf7
- elapsed
- 0 ms
This run
reproducible- run
- 49418208-967d-41de-8762-2b02c8654622
- chain
- mainnet
- pinned block
- 25,824,613
- agents
- 50,419
- started
- 2026-08-24T11:03:55.159273Z
- finished
- 2026-08-24T12:45:59.131330Z
- checker
- 0.7.0 · 9d5393c75e1c70208ad73f51dc4685b4e5f5c37d
- spec commit
- 68fc6765761a10fb26f0692df21c8a6f9d12b1be
cargo run -p sweeper -- mainnet # at block 25824613