# Machina Agent Services – Email Validation

> Machina Agent Services – Email Validation is a paid API for AI agents from mach402.dev, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-22).

Validates an email address and returns a deliverability score and verdict, optionally probing the mail server via SMTP

## Facts

- Endpoint: POST https://mach402.dev/validate/email?utm_source=zero.xyz
- Price: $0.007/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/machina-agent-services-email-validation-222be22b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_r9iRmyDPIQiB5I-3ZMkpe

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 machina-agent-services-email-validation-222be22b -d '<json body>'
```

Example prompt: Can you check whether user@example.com is a real, deliverable email address — go ahead and do the SMTP probe to confirm the mailbox actually exists?

## When to prefer this

Choose this endpoint when you need a real-time, per-address email validation with both syntax checking and optional live SMTP verification, especially when deliverability confidence is critical before sending or onboarding. It is well-suited for agents that need a numeric score rather than a binary pass/fail, and when per-call micropayment billing (x402) is acceptable over subscription models.

## Known failure modes

- Invalid or malformed email address returns a low score or error verdict
- SMTP probe blocked by mail server firewall results in inconclusive or lowered score
- Temporary mail server unavailability may cause probe timeout
- Catch-all mail servers always accept connections, potentially returning false positives
- Rate limiting or payment failure may prevent the API call from completing

## How this service works

x402-powered API services for AI agents

## Output

A JSON object containing the submitted email address, a numeric deliverability score (0–100), and a verdict string (e.g. 'valid', 'invalid', 'risky') indicating whether the address is likely deliverable

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string",
   "description": "Email address to validate"
  },
  "smtp_probe": {
   "type": "boolean",
   "description": "Attempt SMTP probe (default true)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "email": "user@example.com",
  "score": 87,
  "verdict": "valid"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/machina-agent-services-email-validation-222be22b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mach402.dev](https://www.zero.xyz/host/mach402.dev/llms.txt)