DNS lookup

Live DNS lookup for a domain: returns name, type and records[]. Send GET /api/dns with the required field name and pay $0.001 per call over x402 or MPP (there is no free tier). It returns a JSON object with name, type and records.

Supported record types: A, AAAA (addresses as strings), MX ({exchange, priority} objects), TXT (each record an array of its strings), NS and CNAME (hostnames). For SPF, DMARC or a full mail-security read use spf-check, dmarc-check or email-deliverability.

Category: Network & domains · Tags: dns domains networking

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Parameters

Example request

curl -i "https://agent402.tools/api/dns?name=example.com&type=A"

Without payment this returns HTTP 402 Payment Required with the exact price for dns; any x402 v2 or MPP client pays it and retries.

Example response

{
  "name": "example.com",
  "type": "A",
  "records": [
    "93.184.215.14"
  ]
}

From an MCP client

catalog.call {
  "slug": "dns",
  "params": {
    "name": "example.com",
    "type": "A"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for dns; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• name is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• Cached: an identical request within 5m is answered from cache with X-Cache: hit.
• A POST with a JSON body to /api/dns is served as this GET, with the body as the input.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

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();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/dns?name=example.com&type=A");

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