# Email Auth Checker

> Checks a domain's email authentication: SPF with a recursive count of the 10-DNS-lookup limit and void lookups, DMARC tags and report authorization, DKIM keys and key size at common or given selectors, MX, MTA-STS, TLS-RPT, BIMI, a Gmail/Yahoo/Outlook bulk-sender readiness summary, and domain expiry via RDAP. Made by Quietwork Labs.

- MCP (Streamable HTTP): https://email-auth-check.quietworklabs.workers.dev/mcp (tools: email_auth_report, spf_lookup_count, dmarc_check, domain_expiry; 5 free calls/day per tool, then x402 USDC on Base)
- HTTP API (x402 v2, pay per call, no account):
  - GET https://email-auth-check.quietworklabs.workers.dev/v1/email-auth ($0.003): Full email authentication report for a domain
  - GET https://email-auth-check.quietworklabs.workers.dev/v1/spf ($0.001): SPF record tree with RFC 7208 lookup and void-lookup counts
  - GET https://email-auth-check.quietworklabs.workers.dev/v1/dmarc ($0.001): DMARC record parse and validation
  - GET https://email-auth-check.quietworklabs.workers.dev/v1/domain-expiry ($0.002): Domain registration and expiry date via RDAP
- OpenAPI: https://email-auth-check.quietworklabs.workers.dev/openapi.json
- x402 manifest: https://email-auth-check.quietworklabs.workers.dev/.well-known/x402
- Docs: https://email-auth-check.quietworklabs.workers.dev/docs · Guides: https://email-auth-check.quietworklabs.workers.dev/guides
- About: https://email-auth-check.quietworklabs.workers.dev/about · Terms: https://email-auth-check.quietworklabs.workers.dev/terms