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

# Introduction

> Free, open REST API for FMCSA carrier data

# DotLookup API

Free, open REST API for FMCSA carrier data. No API key required for basic lookups.

## Base URL

```
https://api.dotlookup.dev/v1
```

## Quick Start

Look up any carrier by DOT number — no signup needed:

```bash theme={null}
curl https://api.dotlookup.dev/v1/carriers/2233855
```

## What's Available

<CardGroup cols={2}>
  <Card title="Carrier Profiles" icon="truck" href="/endpoints/get-carrier">
    Full carrier details: address, contact, fleet size, authority status
  </Card>

  <Card title="Search" icon="magnifying-glass" href="/endpoints/search-carriers">
    Text search with filters, geo/radius support, and pagination
  </Card>

  <Card title="Safety Data" icon="shield-check" href="/endpoints/get-safety">
    Inspections, OOS rates, crash statistics, BASIC violations
  </Card>

  <Card title="Insurance" icon="file-contract" href="/endpoints/get-insurance">
    Active insurance policies with coverage details
  </Card>
</CardGroup>

## Authentication

Most endpoints work without authentication. [Sign up](/endpoints/signup) for an API key to get higher rate limits and access to the [bulk lookup](/endpoints/bulk-lookup) endpoint.

<Card title="Authentication Guide" icon="key" href="/guides/authentication">
  Learn how to authenticate your requests
</Card>