# SignalDesk AI Email Validate

> SignalDesk AI Email Validate is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).

Validates an email address for syntax correctness and mailbox deliverability via a paid per-call API

## Facts

- Endpoint: POST https://x402-agent.kariguetoazul.workers.dev/api/network/email-validate?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-email-validate-2c8159c9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_58teI9o0toLcAEkGh6A2x

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 signaldesk-ai-email-validate-2c8159c9 -d '<json body>'
```

Example prompt: Can you check if 'john.doe@example.com' is a valid, deliverable email address — verify both the syntax and whether the mailbox actually exists?

## When to prefer this

Choose this endpoint when you need a lightweight, per-call email validation that covers both format syntax checking and live mailbox reachability verification at a very low cost ($0.001 USDC per call). Ideal for agents performing real-time lead validation, signup gating, or CRM hygiene where you need a fast boolean answer rather than a full deliverability audit. Prefer this over free regex-only checks when mailbox existence matters.

## Known failure modes

- Missing or empty email field returns a validation error
- Email string exceeding 512 characters is rejected
- Malformed JSON request body results in a 400-level error
- Payment failure or insufficient USDC balance may result in 402 Payment Required
- Mailbox verification may be inconclusive for some domains that block SMTP probing, returning false negatives
- Rate limiting or quota exhaustion may return 429 or equivalent error

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

Returns a JSON object with two boolean fields: 'valid_syntax' (whether the email string is correctly formatted) and 'mailbox_verified' (whether the mailbox was confirmed to exist and accept mail). Example: {"valid_syntax": true, "mailbox_verified": false}.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string",
   "maxLength": 512,
   "description": "Email candidate."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "valid_syntax": true,
  "mailbox_verified": false
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-email-validate-2c8159c9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)