Query String

{
  "action": "parse",
  "asOf": "2026-10-11T23:29:15.383Z",
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "duplicateKeys": [
    "a"
  ],
  "grouped": {
    "a": [
      "1",
      "3"
    ],
    "b": [
      "two words"
    ],
    "flag": [
      ""
    ]
  },
  "notChecked": [
    "nested bracket syntax such as a[b]=1 (kept as a literal key)",
    "semicolon separators (treated as part of the value)",
    "…1 more"
  ],
  "pairs": [
    {
      "key": "a",
      "value": "1"
    },
    {
      "key": "b",
      "value": "two words"
    }
  ],
  "reasons": [
    "Repeated keys: a.",
    "Keys with no = sign (empty value): flag."
  ],
  "skipped": 0,
  "source": "computed locally (WHATWG application/x-www-form-urlencoded)",
  "summary": "4 parameter(s), 3 distinct key(s), 1 repeated.",
  "verdict": "PARSED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://url-text-tools.x402tookit.com/query-string?action=parse&query=%3Fa%3D1%26b%3Dtwo%2520words%26a%3D3%26flag'

# 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 - 'https://url-text-tools.x402tookit.com/query-string?action=parse&query=%3Fa%3D1%26b%3Dtwo%2520words%26a%3D3%26flag' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Furl-text-tools.x402tookit.com%2Fquery-string
const res = await pay("https://url-text-tools.x402tookit.com/query-string?action=parse&query=%3Fa%3D1%26b%3Dtwo%2520words%26a%3D3%26flag");
console.log(res.status, await res.text());

# 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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://url-text-tools.x402tookit.com/query-string?action=parse&query=%3Fa%3D1%26b%3Dtwo%2520words%26a%3D3%26flag")
    print(res.status_code, res.text)