REST API v2.0.1

The API for
Email Infrastructure

Send notifications, verification codes, and marketing campaigns with a simple JSON payload.

Postman Preview
POST https://api.hihemax.com/api/send
Authorization: Bearer hm_live_...
Content-Type: application/json
{
"to": "user@example.com",
"subject": "Welcome Home",
"body": "Your account is ready!"
}

Metered Billing

Only pay for what you send. Our credit-based system ensures you never overpay for your email infrastructure.

1 Credit = 1 Email

Every recipient counts as one credit. No hidden fees or monthly minimums for the API.

Bulk Discounts

Credits start at $0.001 per email. Volume discounts apply automatically for high-scale users.

Core Endpoint Reference

Every request must include the X-API-Key header for authentication.

POST/api/send

Send an email programmatically. Requires 1 credit per recipient.

1 Credit
GET/api/mailboxes

List all mailboxes under your domain.

Free
POST/api/keys

Generate a new API key.

Free
GET/api/usage

Retrieve your API usage logs and credit balance.

Free

Important: Webhook Security

Always verify the signature header when receiving webhooks from HiheMAX Mail to ensure the requests are authentic. Refer to the Webhook Guide for implementation details.