> ## 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.

# API Reference Overview

> All DataLink APIs endpoints at a glance.

## Base URL

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

## Request format

All endpoints use `POST` with a JSON body and Bearer token authentication.

```bash theme={null}
curl -X POST https://api.datalinkapis.com/v1/{endpoint} \
  -H "Authorization: Bearer dl_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{ ... }'
```

## Endpoints

### Core endpoints

| Endpoint                                   | Description                           | Credits |
| ------------------------------------------ | ------------------------------------- | ------- |
| [`POST /v1/email`](/api-reference/email)   | Email syntax, MX, and SMTP validation | 1       |
| [`POST /v1/ip`](/api-reference/ip)         | IP geolocation and proxy detection    | 1       |
| [`POST /v1/phone`](/api-reference/phone)   | Phone carrier and HLR lookup          | 2       |
| [`POST /v1/domain`](/api-reference/domain) | Domain WHOIS, DNS, and safety score   | 2       |

### Bundle endpoints

Bundle endpoints charge dynamically based on the fields you include — you only pay for the lookups you request.

| Endpoint                                                   | Description                                     | Credits |
| ---------------------------------------------------------- | ----------------------------------------------- | ------- |
| [`POST /v1/deliverability`](/api-reference/deliverability) | Deep email deliverability check                 | up to 3 |
| [`POST /v1/contact-intel`](/api-reference/contact-intel)   | Email + Phone + Domain + IP combined            | up to 4 |
| [`POST /v1/fraud-signals`](/api-reference/fraud-signals)   | Email + Phone + IP — composite fraud risk score | up to 4 |

## Common fields in every response

| Field          | Type    | Description                       |
| -------------- | ------- | --------------------------------- |
| `credits_used` | integer | Credits deducted for this request |

## Try it live

Use the [API Playground](https://datalinkapis.com/playground) to fire real requests against all endpoints without writing any code.