DNS propagation check

Resolve the same DNS record against 4 public resolvers (Google, Cloudflare, Quad9, OpenDNS) in parallel; surface divergences. Send POST /api/dns-propagation with the required field host and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with host, type, consistent, resolvers and queriedAt.

The first call you make after a DNS change - confirms the world sees what you intended.

Category: Network & domains · Tags: dns propagation network diagnostic migration resolver

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/dns-propagation \
  -H "Content-Type: application/json" \
  -d '{"host":"google.com","type":"A"}'

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

Example response

{
  "host": "google.com",
  "type": "A",
  "consistent": true,
  "resolvers": [
    {
      "resolver": "8.8.8.8",
      "name": "Google",
      "records": [
        "142.250.80.46"
      ],
      "count": 1
    },
    {
      "resolver": "1.1.1.1",
      "name": "Cloudflare",
      "records": [
        "142.250.80.46"
      ],
      "count": 1
    },
    {
      "resolver": "9.9.9.9",
      "name": "Quad9",
      "records": [
        "142.250.80.46"
      ],
      "count": 1
    },
    {
      "resolver": "208.67.222.222",
      "name": "OpenDNS",
      "records": [
        "142.250.80.46"
      ],
      "count": 1
    }
  ],
  "queriedAt": "2026-06-19T20:00:00.000Z"
}

From an MCP client

catalog.call {
  "slug": "dns-propagation",
  "params": {
    "host": "google.com",
    "type": "A"
  }
}

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

Errors and behavior

• host 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.
• A GET or HEAD to /api/dns-propagation returns the same 402 quote, so the price can be read without a body.
• 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-propagation", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "host": "google.com",
    "type": "A"
  }),
});

Part of these workflows

DNS propagation check is one step in this skill pack, each sold as a single call:

• DNS & network ops - End-to-end DNS health check: records, multi-resolver propagation, WHOIS, ASN, robots.txt, and reachability.

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