Mail, DNS and domain checks

Checks and diagnostics for developers and AI agents.

Audit SPF, DMARC, DKIM and MX with structured results that explain what was found and why it matters. Run a free browser check on any tool page. The pay-per-request API works without account or subscription.

Pay per request with x402 in USDC. Read the API reference.

{
  "endpoint": "mail.check",
  "status": "warning",
  "data": { "mx": {…}, "spf": {…}, "dmarc": {…} },
  "findings": [
    { "code": "DMARC_POLICY_NONE", "severity": "info" },
    { "code": "SPF_NEUTRAL_ALL", "severity": "warning" }
  ],
  "meta": { "cache_hit": false }
}