Check Answer

Last 30 days

Uptime

100%

Response time

168 ms typical, 239 ms slowest 5%

Last check

2 h ago

Next check

any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://claim-grounding.prospectintel.workers.dev/v1/check_answer" \
  -H "content-type: application/json" \
  -d '{"answer":"Paris is the capital of France. Water boils at 100 degrees Celsius at sea level."}'

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fclaim-grounding.prospectintel.workers.dev%2Fv1%2Fcheck_answer
const res = await pay("https://claim-grounding.prospectintel.workers.dev/v1/check_answer", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"answer":"Paris is the capital of France. Water boils at 100 degrees Celsius at sea level."}),
});
console.log(await res.json());

Example input

{
  "answer": "Paris is the capital of France. Water boils at 100 degrees Celsius at sea level."
}

Example output

{
  "claims": [
    {
      "citations": [
        {
          "provider": "context",
          "quote": "Paris is the capital and largest city of France.",
          "retrieved_at": "2026-10-10T12:00:00.000Z",
          "title": "Paris",
          "url": "https://en.wikipedia.org/wiki/Paris"
        }
      ],
      "claim_id": "clm_3f9a1c2b4d5e6f70",
      "confidence": 0.92,
      "grounding_required": true,
      "rationale_short": "Claim wholly entailed by cited evidence.",
      "span": {
        "end": 30,
        "start": 0
      },
      "support_score": 0.92,
      "text": "Paris is the capital of France",
      "verdict": "supported"
    }
  ],
  "job_id": null,
  "mode": "fast",
  "next_actions": [],
  "receipt": {
    "claim_hashes": [
      "sha256:UGFyaXMgaXMgdGhlIGNhcGl0YWwgb2Yg"
    ],
    "created_at": "2026-10-10T12:00:00.000Z",
    "evidence_urls": [
      "https://en.wikipedia.org/wiki/Paris"
    ],
    "priced_usd": 1,
    "verdicts": [
      "supported"
    ]
  },
  "result_id": "res_1a2b3c4d5e6f7a8b",
  "source": "https://en.wikipedia.org/wiki/Paris",
  "upsell": null,
  "why": "Claim wholly entailed by cited evidence."
}

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