# SYNTHORA Email Verification

> 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.

## Facts

- Endpoint: POST https://api.hergertsynthora.com/v1/mailcheck
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-email-verification-4a0be871
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_39poSsl2_TKlO799bzEab

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability synthora-email-verification-4a0be871 -d '<json body>'
```

Example prompt: Can you check if john.doe@example.com is a real, deliverable email address — I want to know if it's disposable, a catch-all, or has any typos before I add it to my mailing list?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string",
   "description": "Email address to verify"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-email-verification-4a0be871/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.hergertsynthora.com](https://www.zero.xyz/host/api.hergertsynthora.com/llms.txt)