> ## Documentation Index
> Fetch the complete documentation index at: https://developer.zeckta.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Zeckta Messaging API

> SMS messaging, OTP verification, bulk campaigns, and delivery tracking.

Build messaging experiences with a single API.

Send SMS, deliver one-time passwords, launch bulk campaigns, and monitor delivery status in real time.

## Get Started in Minutes

<Card title="Quickstart" icon="zap" href="/introduction/quickstart" horizontal>
  Create an API key, send your first SMS, and track delivery status in just a few minutes.
</Card>

***

## What You Can Build

<CardGroup cols={2}>
  <Card title="Transactional SMS" icon="message-square">
    Send alerts, notifications, reminders, and customer communications.
  </Card>

  <Card title="OTP Verification" icon="shield-check">
    Deliver one-time passwords for authentication, onboarding, and account recovery.
  </Card>

  <Card title="Bulk Campaigns" icon="users">
    Send messages to large recipient lists with campaign-level reporting.
  </Card>

  <Card title="Delivery Callbacks" icon="webhook">
    Receive real-time message status updates without polling.
  </Card>
</CardGroup>

***

## Core Documentation

<CardGroup cols={2}>
  <Card title="Authentication" icon="key" href="/authentication/authentication">
    Learn how to authenticate API requests securely.
  </Card>

  <Card title="SMS Messaging" icon="message-square" href="/messaging/overview">
    Send single messages, campaigns, and track delivery status.
  </Card>

  <Card title="OTP Service" icon="shield-check" href="/security-auth/otp-service-overview">
    Generate and verify one-time passwords.
  </Card>

  <Card title="API Reference" icon="terminal" href="/api-reference/introduction">
    Explore endpoints, request formats, and response schemas.
  </Card>
</CardGroup>

***

## Key Features

* SMS messaging
* Bulk campaigns
* OTP verification
* Sender Name management
* Delivery tracking
* Webhook callbacks
* Message preview and cost estimation
* Workspace isolation
* API key authentication

***

## Production Ready

<CardGroup cols={2}>
  <Card title="Secure Authentication" icon="lock">
    API key authentication with workspace-level isolation.
  </Card>

  <Card title="Rate Limiting" icon="gauge">
    Predictable throughput controls and abuse protection.
  </Card>

  <Card title="Real-Time Visibility" icon="chart-bar">
    Track message delivery through APIs and webhooks.
  </Card>

  <Card title="Scalable Infrastructure" icon="server">
    Designed for transactional and high-volume messaging workloads.
  </Card>
</CardGroup>

<Note>
  All production API requests should be made over HTTPS.
</Note>