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Agent

PostBridge AI

base|id 44558|owner 0xcd012cd3413e8288e0fb330fa37ac5d18a330c8b

Checks 1–7

AI postal agent — send physical letters to US, France, UK, Canada, Germany. Intent-driven pricing via ANP (Agent Negotiation Protocol). Cryptographic proof of sending via Verifiable Credentials, with delivery proof when a carrier/provider supplies it. The complete /mcp profile uses a subscription-backed API & MCP key. The ChatGPT /mcp/openai profile uses OAuth 2.1. For Business v2, API/MCP keys with send or full access and OAuth grants with send permission use a nominated licensed Team sponsor, while read-only credentials use no licensed sponsor slot. DID/UCAN-authenticated x402 A2A payment is REST-only at POST /api/orders/x402. Discoverable on the Olas Mech Marketplace (Agent NFT #58, Component NFT #328, Ethereum) and Fetch.ai Agentverse.

Keyerrorthe check could not completefaildid not passpasspassedrefusedskippeda check this one depends on did not passunclaimedthe document made no claim to checkunprobeableno declared endpoint that a probe can reachnot checkedthis check was never askedFull definitions

The seven checks, with their evidence

6 recorded
Every field the checker recorded, rendered in full rather than summarised, with the timestamp it was recorded at.

  1. Registered?rung 1 · registered

    pass

    The agent exists in the on-chain registry, with an owner and a document URL.

    passed

    block_number
    52281733
    chain_id
    8453
    owner
    0xcd012cd3413e8288e0fb330fa37ac5d18a330c8b
    registry
    0x8004a169fb4a3325136eb29fa0ceb6d2e539a432
    token_id
    44558
    tx_hash
    0xe487b4b8c34b3d12262d3beef9ac5a1a6332d9462d47811d5474a54aa281a429

    checked at 2026-10-07T10:58:40.257463Z

  2. Reachable?rung 2 · resolvable

    pass

    The document URL it declared actually answers when fetched.

    passed

    elapsed_ms
    1120
    final_url
    https://www.postbridge.ai/.well-known/agent.json
    http_status
    200
    request_url
    https://postbridge.ai/.well-known/agent.json
    scheme
    https
    uri
    https://postbridge.ai/.well-known/agent.json

    checked at 2026-10-07T10:58:40.257463Z

  3. Readable?rung 3 · parseable

    pass

    What came back is valid JSON that a machine can read.

    passed

    body_bytes
    13081
    body_sha256
    d9e0c9fd79ee8e74fe48fcd3dd4b6a8507b559e8e3dc385cde461ca0323dfd7b
    content_type
    application/json; charset=utf-8

    checked at 2026-10-07T10:58:40.257463Z

  4. Follows the spec?rung 4 · conformant

    pass

    The document meets what ERC-8004 requires of it.

    passed

    both_fields_present
    false
    legacy_endpoints_field
    false
    may_gaps
    x402Support, active, supportedTrust
    must_violations
    (empty)
    registrations_checked
    0
    services_field_source
    neither
    services_status
    absent
    should_gaps
    type, image, services, registrations
    spec_commit
    68fc6765761a10fb26f0692df21c8a6f9d12b1be

    checked at 2026-10-07T10:58:40.257463Z

  5. Claims its identity?rung 5 · bound

    unclaimed

    The 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 2026-10-07T10:58:40.257463Z

  6. Answers?rung 6 · —

    not checked

    A declared endpoint responds to a probe. Not implemented yet, so nobody passes or fails it.

    not checked — this check was never asked

    This run never reached this check for this agent.

  7. Has feedback?rung 7 · attested

    pass

    At least one on-chain feedback entry names this agent.

    passed

    distinct_authors
    1
    feedback_count
    1

    checked at 2026-10-07T10:58:40.257463Z

Check it again, now

outside the census
Everything above is one sweep, pinned to one block. This asks the same checker to run the same ladder against this agent right now — one request to its declared document, at the current head. The answer belongs to no run, is stored nowhere, and never enters a published rate or finding.
Sends one request to the agent’s own server. Rate limited.

On-chain snapshot

base
token id
44558
owner
0xcd012cd3413e8288e0fb330fa37ac5d18a330c8b
block
52,281,733
observed
2026-10-07T10:58:40.261379Z
tokenURIopen →
https://postbridge.ai/.well-known/agent.json

What the fetch saw

https
scheme
https
request url
https://postbridge.ai/.well-known/agent.json
final url
https://www.postbridge.ai/.well-known/agent.json
http status
200
content type
application/json; charset=utf-8
size
13,081 bytes
sha256
d9e0c9fd79ee8e74fe48fcd3dd4b6a8507b559e8e3dc385cde461ca0323dfd7b
elapsed
1,120 ms

This run

reproducible
Every status above is scoped to this sweep, at this block. Rerun it and you should get these answers back.
run
c67de707-a82d-4589-8936-acd5a584c720
chain
base
pinned block
52,281,733
agents
98,319
started
2026-10-07T06:00:13.662398Z
finished
2026-10-07T19:18:37.899751Z
checker
0.7.0 · 10238dd9af44dfa032e6578390569a413a6bb393
spec commit
68fc6765761a10fb26f0692df21c8a6f9d12b1be
Reproduce
cargo run -p sweeper -- base   # at block 52281733

What each check measures →