402oracle · Verify Claim

POSTBaseArbitrumPolygon

$0.25

per call · USD Coin on Base

Fact-check a single factual claim against web evidence before your agent relies on it. A fact-checking oracle and hallucination guard: returns a verdict (supported / contradicted / insufficient), a confidence score, and citations, as a signed attestation.

Endpoint

POST https://402oracle.com/verify/claim

Calls / 30d

Unique payers / 30d

Sep 10

Last called

exact

Payment scheme

Call this service

TypeScript · @x402/fetch

import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay("https://402oracle.com/verify/claim", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "claim": "Company X was founded in 2019."
  }),
});
const data = await res.json();

cURL

curl -X POST \
  "https://402oracle.com/verify/claim" \
  -H "Content-Type: application/json" \
  -d '{"claim":"Company X was founded in 2019."}' \
  -H "X-PAYMENT: <signed x402 payment>"

Example response

{
  "attestation": {
    "confidence": 0.8,
    "result": {
      "citations": [
        "https://example.com/about"
      ],
      "verdict": "supported"
    },
    "subject": {
      "claim": "Company X was founded in 2019."
    },
    "type": "claim_verification"
  },
  "signature": {
    "alg": "ES256",
    "jwks": "/.well-known/jwks.json"
  }
}

Payment details

Pay to0x7a19cd388c7f69145fef09b960853e0a429b6f4a

AssetUSD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913

NetworksBase, Arbitrum, Polygon

Schemesexact

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