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

# Introduction

> One API key. Four intelligence bundles. Real-time data on email, phone, IP, and domain.

## What is DataLink APIs?

DataLink APIs is a data intelligence gateway that lets you validate and enrich any contact or entity with a single API call. Instead of managing four separate vendor integrations, you get one key, one endpoint pattern, and one credit system across all data types.

<CardGroup cols={2}>
  <Card title="Email Validation" icon="envelope" color="#10B981">
    Syntax check, MX record lookup, and live SMTP reachability. Know if an address can receive mail before you send.
  </Card>

  <Card title="Phone HLR" icon="phone" color="#10B981">
    Carrier identification and Home Location Register lookup. Confirm a number is active and on-network in real time.
  </Card>

  <Card title="IP Intelligence" icon="globe" color="#10B981">
    Geolocation, ISP, ASN, VPN and proxy detection. Know where your users are coming from and whether to trust the connection.
  </Card>

  <Card title="Domain Intelligence" icon="link" color="#10B981">
    WHOIS data, DNS health, and a composite safety score. Profile any domain before you engage with it.
  </Card>
</CardGroup>

## Bundle endpoints

For higher-signal use cases, bundle endpoints combine multiple data types in a single call — cheaper than calling each individually. You are only billed for the fields you include.

| Endpoint             | What it covers                                     | Credits |
| -------------------- | -------------------------------------------------- | ------- |
| `/v1/deliverability` | Deep email SMTP + spam trap + disposable detection | up to 3 |
| `/v1/contact-intel`  | Email + Phone + Domain + IP in one request         | up to 4 |
| `/v1/fraud-signals`  | Email + Phone + IP — composite fraud risk score    | up to 4 |

## How credits work

Every API call costs credits based on the lookups performed. Credits are deducted from your monthly allowance. Your plan determines how many credits you get per month.

| Plan    | Credits / month | Price |
| ------- | --------------- | ----- |
| Free    | 200             | \$0   |
| Starter | 5,000           | \$49  |
| Pro     | 25,000          | \$199 |

<Note>
  Credits reset at the start of each billing cycle. Unused credits do not roll over.
</Note>

## Base URL

All API requests are made to:

```
https://api.datalinkapis.com
```

## Next steps

<CardGroup cols={2}>
  <Card title="Quick Start" icon="bolt" href="/quickstart">
    Make your first API call in under 5 minutes.
  </Card>

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