Developer-First Platform

APIPowerful APIs, Total Control

Two comprehensive REST APIs to integrate MailXpertise into your ecosystem. Everything you can do in the platform, and more—programmatically.


Platform Control API

Full control over campaigns, contacts, templates, and all platform features.

Campaign creation & scheduling
Contact & list management
Template CRUD & versioning
Advanced statistics & reporting
Automation workflow management
User & permission management

Gateway API

High-performance transactional messaging with advanced features.

Transactional email & SMS delivery
Idempotency keys for guaranteed delivery
Automatic email → SMS cascading
Real-time event webhooks
Bulk operations & scheduling
Template rendering & personalization (Twig)

Response Time

<100ms

Uptime SLA

99.99%

Rate Limit

10K/min

Endpoints

50+

Quick Start

Send your first email in minutes

// Send Transactional Email
POST /api/email
Authorization: Bearer YOUR_API_TOKEN
{
"to": "customer@example.com",
"subject": "Welcome!",
"template_id": "welcome-email",
"idempotency_key": "user-123-welcome"
}

JSON responseBatch supportWebhooksHTTPS only

Enterprise Security

Token authentication
HTTPS encryption
Rate limiting
Audit logs

Advanced Features

Enterprise-Grade Capabilities

Built for scale, security, and reliability

Token Authentication

Secure Bearer token authentication with fine-grained permissions

Idempotency Keys

Prevent duplicate operations with built-in idempotency support

Real-time Webhooks

Instant notifications for opens, clicks, bounces, and deliveries

Auto-Cascading

Automatically fallback from email to SMS based on delivery status

Bulk Operations

Send thousands of messages with batch processing

Advanced Analytics

Access detailed metrics and engagement data via API

Smart Scheduling

Schedule messages with timezone support and smart timing

Template System

Powered by Twig – Dynamic templates with variables, conditionals, and advanced logic

Multi-Channel

Email, SMS, and RCS from a single unified API

Ready to Integrate?

Explore our comprehensive API documentation or speak with our team to plan your integration.