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Proof of Service
x402
Proof of Service is a paid API for AI agents from phion.systems, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).
Commits request, authority, execution, payment, and delivery evidence together into a single auditable proof record
Price / call$0.005
Success—
StatusUnknown
How this service works
Commit request, authority, execution, payment and delivery evidence in one auditable proof
Output
A signed, auditable proof object that cryptographically binds request, authority, execution, payment, and delivery evidence into a single tamper-evident record, serving as a portable trust receipt for the completed service.
Example use cases
Audit trail for paid agent task
“We just finished an AI agent job that was authorized, executed, and paid — can you generate a proof-of-service that links the request, authority, payment confirmation, and delivery evidence into one auditable record?”
Dispute-ready delivery attestation
“Bundle the authority, execution, and payment evidence for the delivery that just completed into a single tamper-evident proof so we have something verifiable if there's ever a dispute.”
Compliance receipt for agentic commerce
“I need a signed, auditable proof-of-service receipt that covers every stage — the original request, who authorized it, how it was executed, and that payment and delivery both happened — for our compliance records.”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/proof-of-service?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a single, cryptographically-linked attestation that covers every stage of a service interaction — request, authority, execution, payment, and delivery — in one record. Prefer it over standalone payment receipts or delivery confirmations when auditability, dispute resolution, or compliance requires all evidence to be bound together and independently verifiable. Especially valuable in multi-agent workflows where different parties handle different stages and a unified proof of the complete journey is needed.
Side effects
- Missing required evidence fields — returns validation error if any of request, authority, execution, payment, or delivery evidence is absent
- Malformed input payload — returns schema error if the JSON body does not conform to expected structure
- Payment not detected — the x402 micropayment of $0.005 USDC must be included or the request is rejected
- Duplicate submission — committing identical evidence twice may return a conflict or idempotency error
- Internal attestation failure — signing or hashing infrastructure errors may return a 500 with no proof issued
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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