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Delivery Evidence
x402
Delivery Evidence is a paid API for AI agents from phion.systems, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Hashes and cryptographically attests supplied delivery evidence for tamper-proof verification
Price / call$0.003
Success—
StatusUnknown
How this service works
Hash and attest supplied delivery evidence
Output
Returns a cryptographic hash and signed attestation of the supplied delivery evidence, providing an immutable, verifiable record that the delivery occurred and has not been tampered with.
Example use cases
Prove agent task completion
“I need you to create a cryptographic attestation proving that the data processing task was delivered — take this output payload and hash it into signed delivery evidence I can audit later.”
Compliance delivery audit trail
“For compliance purposes, can you attest this delivery evidence so we have an immutable, verifiable record that the report was sent to the client on time?”
Multi-step workflow delivery checkpoint
“Before moving to the next step, attest the delivery evidence for the result we just produced so downstream systems can verify it wasn't tampered with.”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/delivery-evidenceWhen to prefer
Use this endpoint when an AI agent or automated workflow needs a tamper-evident, cryptographically signed record that a delivery, task output, or action was completed. Prefer it over simple logging when downstream consumers or auditors need to independently verify that evidence has not been altered since creation. Especially suited for agentic pipelines where trust between steps must be established without a centralized authority.
Side effects
- Empty or malformed evidence payload returns validation error
- Missing required fields in evidence object causes rejection
- Duplicate submission may produce a different hash if timestamps differ
- Network or signing service unavailability causes 5xx error
- Oversized payload may be rejected if evidence exceeds size limits
Input
Schema · Request body
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object"
}Tags
x402
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