# Hunter Email Verifier

> Hunter Email Verifier is a paid API for AI agents from stableenrich.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).

Verifies whether an email address is deliverable using Hunter.io's email verification service.

## Facts

- Endpoint: POST https://stableenrich.dev/api/hunter/email-verifier
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hunter-c1bc4fe5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zdvrht0l2tL45-Hnzgav5

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 hunter-c1bc4fe5 -d '<json body>'
```

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

## When to prefer this

Use this endpoint when you need to verify a single email address's deliverability before adding it to a CRM, launching an outreach campaign, or sending transactional email. Prefer this over generic SMTP checks when you want Hunter.io's enriched verification signals including domain validity and mailbox existence. Ideal for pre-send validation to reduce bounce rates.

## Known failure modes

- Invalid or malformed email address input returns a validation error
- Email domain does not exist or is unreachable
- Hunter.io API rate limit exceeded
- Insufficient USDC balance for the $0.03 per-call fee
- Catch-all mail server detected — deliverability cannot be confirmed definitively
- Network timeout or upstream Hunter.io service unavailability

## How this service works

Verify email deliverability via Hunter.io.

## Output

Returns a deliverability verdict for the submitted email address, indicating whether the email is valid and likely to receive messages, along with supporting details from Hunter.io's verification engine.

## Example request

```json
{
 "email": "zero-qa@agentmail.to"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string",
   "format": "email",
   "pattern": "^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_'+\\-\\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$",
   "description": "Email address to verify"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "jobId": "3c16f7d3-8782-4a47-a033-b12bb0d7a16d",
  "status": "pending",
  "pollUrl": "https://stableenrich.dev/api/hunter/email-verifier/jobs/3c16f7d3-8782-4a47-a033-b12bb0d7a16d",
  "retryAfterSeconds": 5
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/hunter-c1bc4fe5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stableenrich.dev](https://www.zero.xyz/host/stableenrich.dev/llms.txt)