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Kairostamp Receipt Verification
x402
Kairostamp Receipt Verification is a paid API for AI agents from kairostamp.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Verifies an existing Kairostamp receipt by recomputing its SHA-256 digest, checking hash-chain linkage to the preceding entry, and reporting whether it is covered by an on-chain checkpoint.
Price / call$0.001
Success—
StatusUnknown
How this service works
Receipt verification: read-only hash-chain verification of one existing Kairostamp receipt id. Recomputes the canonical SHA-256 digest, compares it with the stored chain hash, checks linkage to the preceding entry and reports whether the entry is covered by an on-chain checkpoint. Performs no outbound fetch. Single GET query parameter (receipt_id).
Output
Returns a JSON object containing the receipt UUID, a boolean indicating whether it exists, a verdict enum (valid, invalid, indeterminate, or quarantined_legacy), chain details (sequence number, chain hash, previous chain hash, and a linked boolean), and an anchor object indicating whether an on-chain checkpoint covers this entry along with network and status details where available.
Example use cases
Auditing a document timestamp receipt
“I have a Kairostamp receipt with ID 85cd424c-b68b-440e-8f4f-e02147799f30 from a document I timestamped last week — can you verify it's still valid and that the chain hash checks out?”
Compliance check before contract execution
“Before we proceed, I need you to verify that Kairostamp receipt b3a12f9e-44cc-4d1e-9f22-abc123456789 is authentic, correctly linked to its predecessor in the chain, and anchored on-chain.”
Detecting tampered receipts in automated pipeline
“We just received receipt ID f7c0012d-99b2-47ea-a341-deadbeef0001 from a partner — run a Kairostamp verification on it and tell me if the verdict is valid or if there's any integrity issue.”
Technical details
Endpoint
GEThttps://kairostamp.com/api/v1/verifyWhen to prefer
Use this endpoint when you need to cryptographically verify the integrity of a receipt previously issued by a Kairostamp paid endpoint, without making any external network requests. It is the canonical tamper-detection tool for Kairostamp receipts, checking both the local hash-chain linkage and on-chain anchor coverage in a single lightweight GET call. Prefer it over manual digest recomputation or external blockchain explorers for Kairostamp-specific receipts.
Side effects
- Receipt ID does not exist in the system — exists: false, verdict: indeterminate
- Malformed or non-UUID receipt_id — HTTP 400 or validation error
- Receipt hash mismatch — verdict: invalid indicating possible tampering
- No on-chain checkpoint yet — anchor.covered: false with explanatory note
- Legacy receipt with incompatible format — verdict: quarantined_legacy
Tags
x402
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