api.hergertsynthora.com v1 mailcheck

https://api.hergertsynthora.com/v1/mailcheck

answers 402

Verify whether an email address is real and safe to send to. Checks RFC syntax, live MX records, catch-all and disposable/temporary domains, role accounts (info@, admin@), free providers and common typos, returning a deliverability status and confidence score. Use it to validate and enrich contacts, clean email lists and prevent bounces. Deterministic, Ed25519-signed. 0.001 USDC on Base. First 3 c

We sent a real POST request to this endpoint and it answered 402 with payment requirements we could parse.

Price: $0.05
Network: base
Pay to: 0x10800a5a5B9d72251566EC651E862A8b4B427dE0
Spec dialect: v2 (declares x402Version 2)
Transport: PAYMENT-REQUIRED header
HTTP method: POST
Response latency: 143 ms
Payment options: 1 usable of 1
Last checked: 2026-08-15T14:26:44.675Z (1h ago)
Category: finance-crypto

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.hergertsynthora.com%2Fv1%2Fmailcheck"