295 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
Paid RFC822 email-header forensics (cycle 101) — POST text/plain raw email source OR pass ?header=<RFC822> (256KB cap); folds continuation lines, parses per-Received hop (from/by/with-protocol/id/for-address/ips/delay/ti...
Paid bulk-sender email-deliverability verdict (cycle 100) — composes MX + SPF + DKIM + DMARC + MTA-STS + TLS-RPT + provider fingerprint into a single 0-100 deliverability score with A-F grade and findings[]. Different fr...
Paid Certificate Transparency log auditor (cycle 85, x402 $0.001) - GET ?domain=<DOMAIN> queries crt.sh for issued certificates and reports issuer distribution, certificate records, first/last-seen timestamps and an A-F...
Paid deep TLS handshake probe — TLS version (1.0/1.1/1.2/1.3) + cipher suite classification (aead-strong/strong-fs/weak/legacy-fs) + ALPN negotiation (h2/http1.1) + Alt-Svc h3 HTTP/3 endpoint discovery + key_exchange gro...
Paid network-timing breakdown for a URL — DNS resolve + TCP connect + TLS handshake + TTFB (time to first byte) + total download phase-by-phase milliseconds + CDN/edge-region detection from CF-Ray/X-Amz-Cf-Pop/X-Vercel-I...
Paid comprehensive SEO audit (title length, meta description, canonical, robots, viewport, OG/Twitter, JSON-LD, hreflang, favicon, sitemap + A-F grade) via x402
SSL certificate signal check using public Certificate Transparency records, including issuer and expiry risk where available.