User-agent parse

Heuristic user-agent string parser: browser, version, OS, device class, and bot detection.

Input

Field	Type	Description
ua *	string	User-Agent header value

Example output

{
  "browser": "Chrome",
  "version": "125.0",
  "os": "Windows",
  "device": "desktop",
  "bot": false
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/user-agent \
  -H "Content-Type: application/json" \
  -d '{"ua":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0 Safari/537.36"}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

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

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/user-agent", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "ua": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0 Safari/537.36"
  }),
});

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