MailsGuard verifies email addresses via REST API or bulk CSV upload — checking syntax, DNS/MX records, SMTP, disposable emails, catch-all domains, and role-based addresses. $3 per 1,000 verifications. ZeroBounce charges $15. NeverBounce charges $8. Same accuracy, 80% lower cost. Credits never expire. 100 free verifications, no credit card required. Built for developers and marketers who are tired of overpaying for a commodity service.