Tool detail

Email Auth SPF/DMARC/DKIM Check

Checks a domain's SPF, DMARC, DKIM and MX records and grades deliverability and anti-spoofing gaps such as SPF +all or DMARC p=none.

Categories: Domains IP

Use when

audit a domain's email authentication before a campaign
check DKIM for a specific selector on a domain
find SPF/DMARC anti-spoofing gaps for a security review

Not for

not a live-mail-flow test - parses published DNS records only

Inputs

GET query params: domain (string, required, hostname only), selector (string, optional DKIM selector; probes common selectors if omitted)

Admitted input schema

{
  "type": "object",
  "properties": {
    "domain": {
      "type": "string",
      "minLength": 0,
      "maxLength": 253,
      "pattern": "^[A-Za-z0-9-]{1,63}(\\.[A-Za-z0-9-]{1,63})*$",
      "description": "Domain to check — hostname only, no scheme/IP literal, no trailing dot, no localhost, no local/internal/reserved suffix (.local, .internal, .localdomain, .lan, .test)"
    },
    "selector": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "Optional DKIM selector to check authoritatively; if omitted, a common-selector list is probed"
    }
  },
  "required": [
    "domain"
  ],
  "additionalProperties": false
}

Endpoint

Method: GET
URL: https://email-auth.use.x402atlas.com/check

Payment

Protocol: x402
Listed price: 0.01 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: GET https://email-auth.use.x402atlas.com/check
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z