ToolVet
78trust / 100

Text Readability

by SiteCheck in Search & web

x402 APIPassing, checked 4 h ago

Readability of a text in pure code: Flesch Reading Ease, Flesch-Kincaid grade, Gunning Fog, SMOG, Coleman-Liau and ARI, with counts of characters, words, sentences, syllables and complex words, and reading and speaking time. English formulas; other languages get counts only. Syllables are counted by a vowel-group heuristic, so scores are estimates. Up to 100 KB.

POST
https://api.sitecheck-api.workers.dev/api/text/readability
Price
$0.001
per call in USDC
Uptime
100%
last 30 days
Response time
43 ms
54 ms slowest 5%
Last check
Passed
4 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/readability

Each call costs $0.001 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/readability
content-type: application/json

{
  "text": "The cat sat on the mat. The dog ran after it, and the children laughed at them both."
}

Parameters

ParameterTypeRequiredDescription
languagestringNoen (default: all formulas); other codes return counts and times only
textstringYesThe text, up to 100 KB (JSON body field)

Example response

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

{
  "checkedAt": "2026-10-15T13:48:02.034Z",
  "counts": {
    "characters": 67,
    "complexWords": 0,
    "sentences": 2,
    "syllables": 20,
    "words": 18
  },
  "language": "en",
  "readingMinutes": 0.08,
  "scores": {
    "automatedReadability": -0.18,
    "colemanLiau": 1.82,
    "fleschKincaidGrade": 1.03,
    "fleschReadingEase": 103.7,
    "gunningFog": 3.6,
    "smog": null
  },
  "source": "Computed here (pure code): Flesch, Flesch-Kincaid, Gunning Fog, SMOG (needs 3 sentences), Coleman-Liau, ARI",
  "speakingMinutes": 0.12
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.001.

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/readability' \
  -H 'content-type: application/json' \
  --data-raw '{"text":"The cat sat on the mat. The dog ran after it, and the children laughed at them both."}'

# 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/readability' \
  -H 'content-type: application/json' \
  --data-raw '{"text":"The cat sat on the mat. The dog ran after it, and the children laughed at them both."}' \
  | 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 $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
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 $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.sitecheck-api.workers.dev%2Fapi%2Ftext%2Freadability&method=POST
const res = await pay("https://api.sitecheck-api.workers.dev/api/text/readability", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "text": "The cat sat on the mat. The dog ran after it, and the children laughed at them both."
  }),
});
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 $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
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/readability",
        json={
            "text": "The cat sat on the mat. The dog ran after it, and the children laughed at them both.",
        },
    )
    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
4 h agoPassed40254 ms$0.001
8 h agoPassed40243 ms$0.001