ToolVet
80trust / 100

Text Grammar

by SiteCheck in Email & messaging

x402 APIPassing, checked 2 h ago

Grammar, spelling and style check with LanguageTool: each issue with its message, the offending text, its position, up to five suggestions, the rule id and category, plus the corrected text with the first suggestion of each issue applied. Body { text, language }: up to 20 KB, language auto by default. Text is sent only to LanguageTool's public API.

POST
https://api.sitecheck-api.workers.dev/api/text/grammar
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
72 ms
96 ms slowest 5%
Last check
Passed
2 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

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

How to call it

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

Each call costs $0.002 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/grammar
content-type: application/json

{
  "language": "en-US",
  "text": "I has a cat. It sleep all day."
}

Parameters

ParameterTypeRequiredDescription
languagestringNoauto (default), en-US, en-GB, de-DE, fr, es, pt-BR ... as LanguageTool supports them
textstringYesThe text to check, up to 20 KB (JSON body field)

Example response

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

Example response, 31 lines
{
  "checkedAt": "2026-10-15T13:48:02.031Z",
  "corrected": "I have a cat. It sleeps all day.",
  "count": 2,
  "issues": [
    {
      "bad": "has",
      "category": "GRAMMAR",
      "length": 3,
      "message": "Possible agreement error — use the base form here.",
      "offset": 2,
      "ruleId": "BASE_FORM",
      "suggestions": [
        "have"
      ]
    },
    {
      "bad": "sleep",
      "category": "GRAMMAR",
      "length": 5,
      "message": "After ‘It’, use the third-person verb form “sleeps”.",
      "offset": 16,
      "ruleId": "IT_VBZ",
      "suggestions": [
        "sleeps"
      ]
    }
  ],
  "language": "en-US",
  "source": "LanguageTool public API (api.languagetool.org)"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.002.

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/grammar' \
  -H 'content-type: application/json' \
  --data-raw '{"language":"en-US","text":"I has a cat. It sleep all day."}'

# 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/grammar' \
  -H 'content-type: application/json' \
  --data-raw '{"language":"en-US","text":"I has a cat. It sleep all day."}' \
  | 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 $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
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 $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.sitecheck-api.workers.dev%2Fapi%2Ftext%2Fgrammar&method=POST
const res = await pay("https://api.sitecheck-api.workers.dev/api/text/grammar", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "language": "en-US",
    "text": "I has a cat. It sleep all day."
  }),
});
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 $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
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/grammar",
        json={
            "language": "en-US",
            "text": "I has a cat. It sleep all day.",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
2 h agoPassed40296 ms$0.002
6 h agoPassed40272 ms$0.002
10 h agoPassed40242 ms$0.002