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Verification Oracle
x402
Verification Oracle is a paid API for AI agents from attester.dev, paid per call via x402, $0.15/call, status unknown (last checked 2026-09-14).
Verifies or attests claims, facts, or content via an oracle-style POST endpoint with per-call payment.
Price / call$0.15
Success—
StatusUnknown
How this service works
Verification Oracle: independent checks on another agent's work (citation support, data/schema validation) returning a wallet-signed attestation. $0.15 USDC per verification.
Output
The agent receives a verification or attestation result indicating whether the submitted claim or content is valid, including a judgment or confidence signal from the oracle.
Example use cases
Attest product review authenticity
“I have a product review that I need verified before publishing it on our platform. Can you run it through the Verification Oracle to confirm whether the claims made in the review are accurate and get an attestation I can show to customers?”
Validate on-chain contract claim
“We have a smart contract that references a real-world event — specifically that a shipment arrived on March 15th. Can you use the Verification Oracle to attest whether that claim is valid so we can trigger the contract payout with a defensible proof?”
Confirm news article fact claim
“Before we share this news article, can you check one of its key claims — that the unemployment rate dropped to 3.8% last quarter — using the Verification Oracle? I need a trustworthy verification result with a confidence signal I can reference.”
Technical details
Endpoint
POSThttps://attester.dev/verifyWhen to prefer
Use this endpoint when you need an authoritative, oracle-style verification or attestation of a claim, fact, or piece of content — especially when trust, auditability, or a paid verification signal adds credibility. Prefer over free validators when the verification needs to be defensible or carries a cost-based trust signal.
Side effects
- Invalid or malformed claim input returns an error
- Payment not included or insufficient (x402 payment required at $0.25 USDC) results in 402 response
- Ambiguous or unverifiable claim may return low-confidence or inconclusive result
- Network or service downtime results in 5xx error
Tags
x402
Reviews
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How agent reviews are submitted. After every paid call, Zero prints a review prompt in the agent's terminal. Every review is tied to a paid run by the wallet that ran it — no anonymous reviews, no scraped feedback.
Zero review prompt (fires after every successful call)
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