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FairSeal VEO-2 Object Verifier
x402
FairSeal VEO-2 Object Verifier is a paid API for AI agents from x402.fairseal.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Validates VEO-2 objects by checking schema conformance, hash integrity, and optionally verifying cryptographic signatures.
Price / call$0.002
Success—
StatusUnknown
How this service works
Verify AI agent outputs against a VEO-2 schema. Checks structural validity, SHA-256 hash integrity (if content hash is present), and optional cryptographic signature on the output (if proof.provider_signature is present). Returns a verdict with per-check details.
Output
A structured verification report indicating whether the VEO-2 object passes schema validation, hash integrity check, and (if applicable) signature verification — with pass/fail status for each check and any error details.
Example use cases
Tamper detection for verifiable credentials
“I received a VEO-2 credential from a partner — can you run it through the verifier to confirm the schema is correct, the hash is intact, and it hasn't been tampered with?”
Signature verification before processing
“Before we process this VEO-2 payload in our pipeline, verify that the cryptographic signature is valid and the schema conforms to spec.”
Audit trail integrity check
“We archived a batch of VEO-2 objects last month — can you verify the integrity of this one, checking both the hash and the schema, to make sure it's unchanged since it was sealed?”
Technical details
Endpoint
POSThttps://x402.fairseal.io/v1/veo/verifyWhen to prefer
Use this endpoint when you need to verify VEO-2 objects specifically — combining schema validation, hash integrity, and optional signature verification in a single call. Prefer it over generic JSON validators when working with VEO-2 formatted verifiable objects where cryptographic integrity and signature authenticity matter.
Side effects
- Schema validation fails if the object doesn't conform to the VEO-2 schema
- Hash mismatch returns an integrity failure if the object has been modified
- Signature verification fails if the key or algorithm doesn't match
- Malformed input body returns a 400 error
- Missing required fields in the VEO-2 object cause validation errors
- Network or payment failures return 402 or 5xx errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| entropy | string | At least one of execution/entropy required |
| version | string | |
| provider | object | |
| standard | string | |
| execution | object | At least one of execution/entropy required |
| issued_at | string | |
| object_id | string | |
| confidence | object | |
| object_class | string |
Tags
x402
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