Real-time email address validation: syntax, MX records, SMTP check, plus disposable/role/free flags and a deliverability score.
Email Verification (APILayer) via Apiosk: a single GET /check validates one email address end to end — syntax (format_valid), domain MX presence (mx_found), a live SMTP mailbox probe (smtp_check), and classification flags for role addresses, disposable/throwaway domains and free providers, plus a 0–1 quality score. Stateless and metered per call via x402; the caller pays with the X-Payment header while the APILayer key is injected by the provider as the apikey header.
https://gateway.apiosk.com/email-verification