Developer Documentation

Everything you need to integrate Inbox into your application. Simple REST API, comprehensive guides, and code examples.

Quick Start

Send your first message in under 5 minutes.

1

Sign Up

Create your account and get your API key

2

Verify Domain

Add DNS TXT record to verify your domain

3

Send Message

Make your first API call and send a message

curl -X POST https://api.getinbox.app/send \
  -H "Authorization: Bearer $INBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "+15551234567",
    "type": "otp",
    "body": {
      "code": "123456",
      "purpose": "signin",
      "expires_at": "2025-12-31T23:59:59Z"
    }
  }'

Documentation

Quick Start

Get up and running in under 5 minutes. Send your first message and set up webhooks.

API Reference

Complete REST API documentation with all endpoints, parameters, and responses.

Message Schemas

Detailed schemas for all message types: OTP, delivery, transaction, event, and more.

SDKs & Libraries

Official SDKs for JavaScript, Python, Go, and C# with installation guides.

Webhooks

Real-time notifications for message events: sent, delivered, read, action taken.

Verification

Domain verification process and blue check badge requirements.

Security

End-to-end encryption, webhook signatures, and security best practices.

OpenAPI Specification

Download our OpenAPI specification for use with your favorite API tools.

Download JSON Download YAML Import to Postman

Need Help?

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