# Courser Email Verification

> Courser Email Verification is a paid API for AI agents from tizona-outpost.venusberg.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Validates an email address for deliverability without sending any mail, returning a verdict, score, and per-check provenance.

## Facts

- Endpoint: POST https://tizona-outpost.venusberg.workers.dev/v1/verify-email
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/courser-email-verification-364dc464
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5nyHg-uuaYeMKmS5Af5LP

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 courser-email-verification-364dc464 -d '<json body>'
```

Example prompt: Can you verify whether john.doe@gmial.com is a real, deliverable email address — without actually sending anything to it — and tell me the deliverability score and verdict?

## When to prefer this

Choose this endpoint when you need a lightweight, privacy-safe email validation that does not send any probe email. It is ideal for pre-flight checks on user sign-ups, lead lists, or form submissions where you want syntax, MX, disposable-domain, role-address, and typo detection in a single call with per-check provenance and a numeric score. Prefer it over full SMTP-probe services when deliverability inference without side effects is acceptable.

## Known failure modes

- Invalid JSON body or missing email field returns a 4xx error
- Malformed email strings that pass partial syntax checks may still return a verdict
- MX lookup failures (DNS timeouts) may result in undeliverable verdict even for valid addresses
- Disposable domain list may not cover brand-new throwaway services
- No SMTP probe means deliverability is inferred, not confirmed at mailbox level

## How this service works

Validate an email address without sending mail. POST {"email":"name@example.com"} to get one verdict — deliverable, undeliverable, disposable, role_address, typo_suspected, or invalid — plus a 0-100 deliverability score. Checks RFC-5322 syntax, live MX records, disposable/throwaway domains, role mailboxes (info@, support@), and typos of common providers (gmial.com -> gmail.com). Returns MX provider, per-check provenance, and a verdict hash. No SMTP probe.

## Output

Returns a verdict enum (deliverable, undeliverable, disposable, role_address, typo_suspected, or invalid), a 0–100 deliverability score, the detected MX provider, per-check provenance details for syntax/MX/disposable/role/typo checks, and a verdict hash. No email is ever sent during verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/courser-email-verification-364dc464/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tizona-outpost.venusberg.workers.dev](https://www.zero.xyz/host/tizona-outpost.venusberg.workers.dev/llms.txt)