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witnessd Retrieve Witnessed Record
x402
witnessd Retrieve Witnessed Record is a paid API for AI agents from witnessd.vip, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-13).
Retrieves a previously archived, hashed, and Merkle-anchored witness record for a URL or API response by its unique ID.
Price / call$0.05
Success—
StatusUnknown
How this service works
Pay a few cents to have any URL or API response independently fetched, hashed, timestamped and archived by a neutral third party. Merkle-anchored on Base. Built for AI agents; useful to humans.
Output
Returns the previously archived witness record including: the original URL or API response content snapshot, its cryptographic hash, a UTC timestamp of when the fetch occurred, a Merkle proof structure, and the anchor reference on the Base blockchain, all independently attested by the witnessd neutral third party.
Example use cases
Audit trail for AI agent output
“Pull up the witnessd record with ID w_7f3a9d2c — I need to show the Merkle proof and timestamp proving what that pricing API returned when my agent queried it yesterday.”
Legal evidence of webpage content
“Retrieve witness record ID wr_8821bdef for me so I can confirm the archived hash and blockchain timestamp showing exactly what was on that webpage before they edited it.”
Verify a contract term snapshot
“Get me the witnessd record ID ctr_55a1f009 — I need the timestamped hash anchored on Base to prove what the contract terms page said at the time my client agreed to them.”
Technical details
Endpoint
POSThttps://witnessd.vip/api/retrieve/%7Bid%7D?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to retrieve a previously created witness record and its associated cryptographic proof — use it after you have already submitted a URL for witnessing and received a record ID. This is the read/lookup complement to the submission endpoint. Prefer this when you need tamper-evident, third-party-attested proof of what a URL or API returned at a specific moment, especially for audit trails, legal evidence, or AI agent accountability. This differs from general archiving services in that results are Merkle-anchored on Base and designed for machine-readable verification by AI agents.
Side effects
- Invalid or unknown record ID — returns 404 or error indicating the witness record does not exist
- Record ID malformed — returns 400 bad request if the ID format is incorrect
- Payment not confirmed — returns 402 if the $0.05 USDC x402 payment was not completed
- Service unavailable — returns 503 if the archiving backend is temporarily down
- Record expired or pruned — some records may have a retention window and could be unavailable after expiry
Tags
x402
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