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Dev.to
7/3/2026
I bundled email + phone validation into one $0 API (because paying for two subscriptions is silly)

I bundled email + phone validation into one $0 API (because paying for two subscriptions is silly)

Short summary

Developer created Contact Validation API bundling email and phone verification into a single free API tier (500 monthly requests, no card required). Email validation includes RFC checks, live MX lookups, typo autocorrect (gmial.com → gmail.com), and disposable domain detection. Phone parsing supports 240+ regions; the implementation uses Supabase Edge Functions for stateless operation and automatic GDPR compliance.

  • Email validation with typo autocorrect detects 'gmial.com' → 'gmail.com', reducing user drop-off on signup forms
  • Single API handles both email and phone; batch endpoint processes up to 100 items per request, reducing lead-list cleanup cost from 10k requests to 100
  • Stateless Edge Function on Supabase ensures zero server costs, instant deploys, and GDPR compliance by design

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