# ipv4.fr Email Validation API

> ipv4.fr Email Validation API is a paid API for AI agents from ipv4.fr, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-29).

Validates an email address by checking syntax, disposability, and MX records

## Facts

- Endpoint: GET https://ipv4.fr/x402/v1/email/%7Bemail%7D?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ipv4-fr-email-validation-api-131c1445
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_S4hE1Y9PJpGbN_arViGLN

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 ipv4-fr-email-validation-api-131c1445
```

Example prompt: Can you check if user@example.com is a valid, deliverable email — make sure it's not a disposable address and that the domain has real mail servers?

## When to prefer this

Choose this endpoint when you need a lightweight, real-time email validation check that combines syntax verification, disposable provider detection, and MX record lookup in a single call. It is ideal for pre-registration filtering, lead list hygiene, or pre-send deliverability checks where a quick per-address validation at $0.005 USDC is acceptable. Prefer it over heavier email verification services when you don't need full SMTP probing or inbox-level confirmation.

## Known failure modes

- Invalid or malformed email format in the path parameter may return a 400 error
- Network timeouts during MX record DNS lookup may cause partial results or errors
- Unknown or newly registered domains may cause false negatives on MX checks
- Payment not fulfilled (402) if USDC micropayment is not completed via x402 protocol
- Rate limiting if free tier quota is exceeded

## How this service works

Fast, reliable network tools API. IP geolocation, DNS lookup, SSL check, WHOIS, email validation, port scan. Free tier available.

## Output

Returns a JSON object with the input email address, an overall valid boolean, and a checks object containing: syntax (boolean indicating valid format), disposable (boolean flagging throwaway email providers), and mx_records (boolean confirming the domain has valid mail exchange records).

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "email": "user@example.com",
  "valid": true,
  "checks": {
   "syntax": true,
   "disposable": false,
   "mx_records": true
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ipv4-fr-email-validation-api-131c1445/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ipv4.fr](https://www.zero.xyz/host/ipv4.fr/llms.txt)