# x402-toolbox Email Syntax Check

> x402-toolbox Email Syntax Check is a paid API for AI agents from x402-toolbox.shablony-pro.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Validates whether a given email address string conforms to correct email syntax rules

## Facts

- Endpoint: GET https://x402-toolbox.shablony-pro.workers.dev/util/email-syntax-check?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-toolbox-email-syntax-check-85eacf61
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_b1Tm8NOR-V8egzPu3NOHp

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 x402-toolbox-email-syntax-check-85eacf61
```

Example prompt: Can you check if 'john.doe@example.com' is a syntactically valid email address?

## When to prefer this

Choose this endpoint when you need a lightweight, no-signup, pay-per-call email syntax check with no API key overhead — ideal for AI agents operating autonomously via x402 USDC micropayments on Base, where you want deterministic validation without maintaining service credentials.

## Known failure modes

- Missing or empty email string input returns validation failure
- Malformed request schema results in error response
- x402 payment failure prevents tool execution
- Network timeout on the Cloudflare Worker edge

## How this service works

309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.

## Output

Returns a JSON object indicating whether the provided email address string passes syntax validation, with an 'ok' boolean and a 'paid' confirmation field indicating the x402 micropayment was processed.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-toolbox-email-syntax-check-85eacf61/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-toolbox.shablony-pro.workers.dev](https://www.zero.xyz/host/x402-toolbox.shablony-pro.workers.dev/llms.txt)