# Klymax402 Email Send API

> Klymax402 Email Send API is a paid API for AI agents from email-send.api.klymax402.com, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-14).

Sends a transactional email message to a specified recipient with plain text or HTML body content

## Facts

- Endpoint: GET https://email-send.api.klymax402.com/api/send
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/klymax402-email-send-api-04f8d5d2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_giPPhB4I5T8cTidxoKCB7

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 klymax402-email-send-api-04f8d5d2
```

Example prompt: Send an email to john.doe@example.com with the subject 'Your order has shipped' and the body 'Hi John, your order #1234 has shipped and will arrive by Friday. Thanks for shopping with us!' — use noreply@x402.dev as the sender.

## When to prefer this

Choose this endpoint when you need a simple, pay-per-use email sending capability without managing your own SMTP server or email service account — ideal for agents that need to send occasional transactional emails (notifications, alerts, confirmations) and want to pay per message via x402 micropayments rather than maintaining a subscription.

## Known failure modes

- Invalid recipient email address format returns an error
- Missing required fields (to, subject, body or html) may result in a 400 bad request
- Recipient domain unreachable may cause delivery failure
- Payment not provided or insufficient USDC balance causes 402 Payment Required
- Rate limiting may reject high-frequency requests

## How this service works

Send an email message

## Output

A confirmation response indicating whether the email was successfully sent to the specified recipient, typically including delivery status.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "to": {
   "type": "string",
   "description": "Recipient email address"
  },
  "body": {
   "type": "string",
   "description": "Email body content (plain text)"
  },
  "from": {
   "type": "string",
   "description": "Sender email address (default: noreply@x402.dev)"
  },
  "html": {
   "type": "string",
   "description": "Email body content (HTML, optional — overrides body)"
  },
  "subject": {
   "type": "string",
   "description": "Email subject line"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/klymax402-email-send-api-04f8d5d2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email-send.api.klymax402.com](https://www.zero.xyz/host/email-send.api.klymax402.com/llms.txt)