# SHSY Email Preflight
Email preflight: syntax, live MX/DNS evidence, disposable-list match, role/free-provider flags and typo suggestions. Single synchronous JSON response. No SMTP probe; mailbox existence and deliverability stay unknown.
Endpoint: POST https://someonehastosayyes.com/api/agent/email-preflight
Input: {"email":"person@example.com"}
Price: 0.001000 USDC. Network: eip155:8453. x402 v2.
Schema: https://someonehastosayyes.com/agent-seller/openapi.json
Client example: https://someonehastosayyes.com/agent-seller/client.mjs
No account, subscription or API key. Requires a funded Base USDC wallet and compatible x402 client.
Inspect the 402 requirements and your spending policy before paying.
Do not use to prove mailbox existence. No sending, SMTP, catch-all or reputation test.
Source attribution: optional X-SHSY-Source header. Never include an email address in the URL.