Skill: Email deliverability

Bundled execution of the Email deliverability workflow — Diagnose why a domain's email lands in spam: SPF posture, DMARC policy, DKIM key strength, MX targets, and a composite 0–100 score. One x402 payment runs 6 underlying tools (spf-check, dmarc-check, dkim-lookup, email-deliverability, email-validate, dns-lookup); partial-success per step.

Input

Field	Type	Description
domain *	string	Sending domain to diagnose (e.g. stripe.com)

Example output

{
  "pack": "email-deliverability",
  "args": {
    "domain": "example.com"
  },
  "steps": [
    {
      "slug": "spf-check",
      "ok": true,
      "result": {}
    },
    {
      "slug": "dmarc-check",
      "ok": true,
      "result": {}
    },
    {
      "slug": "dkim-lookup",
      "ok": true,
      "result": {}
    },
    {
      "slug": "email-deliverability",
      "ok": true,
      "result": {}
    },
    {
      "slug": "email-validate",
      "ok": true,
      "result": {}
    },
    {
      "slug": "dns-lookup",
      "ok": true,
      "result": {}
    }
  ],
  "summary": "6/6 steps succeeded"
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/skill/email-deliverability \
  -H "Content-Type: application/json" \
  -d '{"domain":"example.com"}'

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/skill/email-deliverability", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "domain": "example.com"
  }),
});

Wallet-only. This tool reaches the network/browser/storage, so it is paid in USDC via x402 (no proof-of-work tier).

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