# Email Deliverability Verification

> Email Deliverability Verification is a paid API for AI agents from win.oneshotagent.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-11-04).

Checks whether an email address is valid and deliverable, returning its current delivery status

## Facts

- Endpoint: POST https://win.oneshotagent.com/v1/tools/lookup/person-email-status?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-04
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-deliverability-verification-f8f43469
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_boZqLLPBdbUANk5BCwIu6

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 email-deliverability-verification-f8f43469 -d '<json body>'
```

Example prompt: Can you check whether john.doe@example.com is a valid, deliverable email address before I add it to my outreach list?

## When to prefer this

Choose this endpoint when you need to programmatically verify a single email address's deliverability status before sending outreach, adding to a CRM, or running a campaign. Prefer it over syntax-only validators when you need real-world delivery confirmation, not just format checks. Best suited for per-address, real-time verification in agentic workflows where avoiding bounces or invalid contacts is critical.

## Known failure modes

- Invalid email format causes validation rejection before lookup
- Email domain does not exist or DNS lookup fails, returning undeliverable status
- Temporary SMTP server issues may return inconclusive or timeout results
- Catch-all mail servers may return valid even for non-existent addresses
- Rate limiting or payment failure blocks the request

## How this service works

Email deliverability verification

## Output

Returns the deliverability status of the submitted email address, indicating whether the address is valid, active, and capable of receiving mail — potentially including status codes, reachability flags, or risk signals about the address.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "email": "user@example.com",
  "valid": true,
  "status": "completed",
  "catch_all": false,
  "disposable": false,
  "deliverable": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-deliverability-verification-f8f43469/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from win.oneshotagent.com](https://www.zero.xyz/host/win.oneshotagent.com/llms.txt)