emailval runs every email address through a five-layer validation pipeline and returns a deliverability score from 0 to 100. Layers: syntax check → MX record lookup → disposable domain detection (350k+ domains) → catch-all probe → SMTP mailbox verification. Pricing: $0.0008 per email via Stripe. No monthly fee, no contracts, no minimums. 10× cheaper than ZeroBounce ($0.008) and 8.7× cheaper than NeverBounce ($0.007). Self-serve: pay with Stripe, get your API key by email in seconds.