ToolVet
78trust / 100

Text Answer

by SiteCheck in Search & web

x402 APIPassing, checked 2 h ago

Answers a question from the given text only (max 30,000 characters), with supporting quotes and their character offsets. Each quote is checked against the text and dropped if it does not occur in it. answerable is false when the text does not contain the answer. Model output: verify before relying on it.

POST
https://api.sitecheck-api.workers.dev/api/text/answer
Price
$0.003
per call in USDC
Uptime
100%
last 30 days
Response time
36 ms
36 ms slowest 5%
Last check
Passed
2 h ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://api.sitecheck-api.workers.dev/api/text/answer

Each call costs $0.003 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://api.sitecheck-api.workers.dev/api/text/answer
content-type: application/json

{
  "question": "What does the text say the fee is?",
  "text": "The membership fee is 40 euros a year, paid in January. Late payment adds 5 euros."
}

Parameters

ParameterTypeRequiredDescription
questionstringYesQuestion to answer (max 500 characters)
textstringYesThe only source for the answer (max 30,000 characters)

Example response

The provider's example. We can't check it without paying.

{
  "answer": "40 euros a year",
  "answerable": true,
  "checkedAt": "2026-10-15T18:21:09.358Z",
  "note": "Quotes are verified as exact substrings of the text; the answer itself is model-written.",
  "question": "What does the text say the fee is?",
  "quotes": [
    {
      "end": 55,
      "quote": "The membership fee is 40 euros a year, paid in January.",
      "start": 0
    }
  ],
  "quotesDropped": 0
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.003.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.sitecheck-api.workers.dev/api/text/answer' \
  -H 'content-type: application/json' \
  --data-raw '{"question":"What does the text say the fee is?","text":"The membership fee is 40 euros a year, paid in January. Late payment adds 5 euros."}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://api.sitecheck-api.workers.dev/api/text/answer' \
  -H 'content-type: application/json' \
  --data-raw '{"question":"What does the text say the fee is?","text":"The membership fee is 40 euros a year, paid in January. Late payment adds 5 euros."}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.sitecheck-api.workers.dev%2Fapi%2Ftext%2Fanswer&method=POST
const res = await pay("https://api.sitecheck-api.workers.dev/api/text/answer", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "question": "What does the text say the fee is?",
    "text": "The membership fee is 40 euros a year, paid in January. Late payment adds 5 euros."
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.sitecheck-api.workers.dev/api/text/answer",
        json={
            "question": "What does the text say the fee is?",
            "text": "The membership fee is 40 euros a year, paid in January. Late payment adds 5 euros.",
        },
    )
    print(res.status_code, res.text)

Security scan

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Recent checks

WhenResultHTTPTimePrice
2 h agoPassed40236 ms$0.003