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

# Introduction

> API-first GTM data-quality infrastructure for outbound agencies and GTM engineers

# Welcome to GTMAPIs

GTMAPIs is API-first GTM data-quality infrastructure for outbound agencies and GTM engineers. The available-now public API products are Email Validation and Premium Catch-All Recovery: validate lists, recover send-worthy catch-alls, protect deliverability, and control credit spend without stitching together UI tools or brittle scripts.

## What Makes Us Different

Our **smart credit system** only charges for high-value personal emails:

* **Valid personal emails** → 1 credit when they are High-Value Validations
* **Role-based emails** (`info@`, `support@`) → 0 credits
* **Catch-all domains** → 0 credits
* **Invalid, risky, or unknown results** → 0 credits

## Key Features

<CardGroup cols={2}>
  <Card title="4-Layer Validation" icon="shield-check">
    Syntax, DNS, SMTP, and catch-all detection with canonical result semantics
  </Card>

  <Card title="B2B Quality Scoring" icon="star">
    Automatically categorize emails by outbound value
  </Card>

  <Card title="API-First Workflows" icon="bolt">
    Stable public endpoints, OpenAPI, SDKs, CLI examples, and agent-readable docs
  </Card>

  <Card title="CSV Upload" icon="file-csv">
    Process larger lists through signed CSV upload and asynchronous validation jobs
  </Card>
</CardGroup>

## Quick Start

Get started in 3 simple steps:

<Steps>
  <Step title="Create an Account">
    Sign up at [gtmapis.com](https://www.gtmapis.com/sign-up)
  </Step>

  <Step title="Get Your API Key">
    Generate a test or live API key from your dashboard
  </Step>

  <Step title="Make Your First Request">
    Send a POST request to validate emails
  </Step>
</Steps>

## Production Ready

* **API**: [api.gtmapis.com](https://api.gtmapis.com) (Railway)
* **Dashboard**: [gtmapis.com](https://www.gtmapis.com/dashboard) (Vercel)
* **Rate Limit**: 10,000 requests/minute per API key, plus 1,000 requests/minute per IP for abuse protection
* **Public contract**: Email Validation, Premium Catch-All Recovery, API-key credit balance, CSV validation jobs, and health probes are documented in the OpenAPI spec

## Need Help?

<CardGroup cols={2}>
  <Card title="Quick Start Guide" icon="rocket" href="/quickstart">
    Get up and running in 5 minutes
  </Card>

  <Card title="API Reference" icon="code" href="/api-reference/overview">
    Complete API documentation
  </Card>
</CardGroup>