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Phion Attest – Signed Integrity & Provenance Receipt for AI-Agent JSON
x402
Phion Attest – Signed Integrity & Provenance Receipt for AI-Agent JSON is a paid API for AI agents from phion.systems, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).
Issues a signed, hash-linked receipt attesting to the integrity, provenance, and freshness of AI-agent JSON payloads
Price / call$0.001
Success—
StatusUnknown
How this service works
Signed integrity, provenance and freshness receipt for AI-agent JSON
Output
A signed, hash-linked receipt containing a cryptographic integrity hash of the submitted JSON payload, a provenance record identifying the issuing agent or system, a freshness timestamp, and a digital signature from phion.systems — enabling any downstream agent or system to independently verify that the payload has not been tampered with and was attested at a specific point in time.
Example use cases
Multi-agent pipeline trust verification
“I need a signed integrity receipt for this JSON output my upstream agent sent me before I pass it along — can you attest its provenance and freshness so the downstream agent can trust it?”
Audit trail for agent commerce transactions
“Before we finalize this agent commerce transaction, please generate a signed provenance receipt for the JSON data we're exchanging so we have a tamper-evident audit trail.”
Freshness proof for time-sensitive agent data
“Certify that this JSON payload from my agent is fresh and hasn't been modified since it was created — I need a signed receipt I can show to the receiving party to prove the data's timestamp and integrity.”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/attest?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs a cryptographically signed, tamper-evident receipt for a JSON payload to establish trust with downstream agents, auditors, or counterparties — especially in multi-agent pipelines, agent commerce flows, or any scenario where provenance, freshness, and integrity of data must be independently verifiable. Prefer this over generic hashing utilities when you need a structured, signed receipt with provenance metadata rather than just a hash value.
Side effects
- Invalid or malformed JSON payload returns a 400 error with a schema validation message
- Payment not received or insufficient USDC balance results in a 402 Payment Required response
- Signature generation failure due to internal key unavailability returns a 500 error
- Request timeout if payload is excessively large or server is overloaded
- Replay of identical payload may produce a distinct receipt due to freshness timestamps, not be idempotent
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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