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SYNTHORA Email Verification
x402
SYNTHORA Email Verification is a paid API for AI agents from api.hergertsynthora.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Verifies whether an email address is real and safe to send to, checking syntax, MX records, disposable domains, catch-all status, role accounts, and common typos, returning a deliverability status and confidence score.
Price / call$0.05
Success—
StatusUnknown
How this service works
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 calls FREE per wallet — send header 'X-WALLET: 0x<your Base address>' (no payment); then per call.
Output
Returns a deliverability status (e.g. valid, invalid, risky, unknown), a confidence score, and detailed flags including: RFC syntax validity, MX record existence, catch-all domain status, disposable/temporary domain detection, role account detection (info@, admin@, etc.), free provider identification, and common typo suggestions. Response is Ed25519-signed for tamper-proof verification.
Example use cases
Pre-send contact validation for CRM
“Before I import this lead into the CRM, can you verify that sarah.jones@acmecorp.com is a real deliverable email and not a role address or disposable inbox?”
Bulk email list bounce prevention
“I'm about to send a campaign — can you check if marketing@startup.io is safe to email, and tell me if it's catch-all or has any MX record issues?”
Sign-up form fraud detection
“A user just signed up with the email temp4521@mailinator.com — is this a real address or a throwaway, and should I block the registration?”
Technical details
Endpoint
POSThttps://api.hergertsynthora.com/v1/mailcheckWhen to prefer
Choose this endpoint when you need fast, deterministic email deliverability checks with cryptographically signed results. Ideal for pre-send validation, CRM enrichment, sign-up fraud prevention, and email list hygiene. Particularly valuable when you need disposable domain detection and role account flagging alongside standard syntax and MX checks. The Ed25519-signed response is useful when auditability of validation results matters.
Side effects
- Missing or malformed email input returns a validation error
- Domains with no public MX records may return unknown status rather than invalid
- Catch-all domains cannot confirm individual mailbox existence, reducing confidence score
- Rate limiting or wallet exhaustion after free tier may block calls
- Temporary DNS lookup failures may cause transient unknown results
- Extremely new or obscure TLDs may not be fully covered
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string | Email address to verify |
Tags
x402
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