# klymax402 Email Send API

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

Sends a transactional email to a specified recipient with a custom subject and body (plain text or HTML) via a pay-per-call x402 endpoint.

## Facts

- Endpoint: GET https://klymax402.com/api/email-send/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-2b2d5b52
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_M7DSuZdz-thdtRAFUCl_M

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-2b2d5b52
```

Example prompt: Send an email to sarah@example.com with the subject 'Your weekly report is ready' and a plain-text body saying 'Hi Sarah, your report for this week has been generated and is attached. Let us know if you have questions.'

## When to prefer this

Choose this endpoint when an AI agent needs to send a transactional or notification email on a pay-per-call basis without requiring pre-configured API keys or an email service account. It is especially useful in agentic workflows where email delivery is an occasional side-effect action (e.g. alerting a user, delivering a report) and where the x402 micropayment model fits the billing context. Prefer alternatives like SendGrid or Mailgun if you need bulk sending, templates, or analytics dashboards.

## Known failure modes

- Invalid recipient email address format — delivery fails or bounces
- Missing required fields (to, subject, body/html) — API returns error
- Sender address override rejected if domain not authorized
- Payment failure if insufficient USDC balance — 402 response returned
- Rate limiting or spam filtering by downstream email provider

## How this service works

One MCP endpoint gives your AI agent access to 100 APIs -- crypto, DeFi, web, AI, finance and utilities. No API keys, USDC on Base from $0.003/call.

## Output

Returns a JSON object confirming delivery with fields including: messageId (unique ID for the sent message), status (delivery status), to (recipient), from (sender), subject, timestamp, bodyLength (character count of the body), contentType (text/plain or text/html), and mode.

## 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"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "to": "example",
  "from": "example",
  "mode": "example",
  "status": "example",
  "subject": "example",
  "messageId": "example",
  "timestamp": "example",
  "bodyLength": 1,
  "contentType": "example"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/klymax402-email-send-api-2b2d5b52/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from klymax402.com](https://www.zero.xyz/host/klymax402.com/llms.txt)