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DefaultVerifier Settlement Witness
x402
DefaultVerifier Settlement Witness is a paid API for AI agents from defaultverifier.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Issues a cryptographically signed, integrity-sealed receipt (proof seal) for an autonomous agent's completed work or transaction settlement.
Price / call$0.001
Success—
StatusUnknown
How this service works
AI agents do the work. DefaultVerifier gives you the receipt — a signed receipt with a proof seal that makes its integrity visible. Verify any receipt yourself; issue your own.
Output
A cryptographically signed receipt containing a proof seal that attests to the integrity of the submitted evidence; the receipt can be independently verified and demonstrates that the witnessed work or settlement occurred as recorded.
Example use cases
Example prompt
“My AI agent just completed a data extraction task — can you create a signed settlement witness receipt with a proof seal for that work so I have a tamper-evident record I can verify independently?”
Technical details
Endpoint
POSThttps://defaultverifier.com/x402/settlement-witnessWhen to prefer
Choose this endpoint when an AI agent needs a tamper-evident, cryptographically signed audit trail for completed autonomous work — especially in multi-party or trustless contexts where external verifiability of the receipt matters. Prefer over generic logging when the integrity and non-repudiation of the work record must be independently verifiable by a third party.
Side effects
- Invalid or malformed evidence payload — receipt not issued
- Payment of 0.001 USDC not received or x402 payment header missing — 402 response
- Proof seal generation failure due to signing service error — 500 response
- Duplicate submission of already-witnessed evidence — may return conflict or idempotency error
- Oversized payload exceeding request limits — 413 response
Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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