# Documentation

## API Endpoint

Base URL

```
https://e-networkId.adzerk.net/udb/networkId/set/i.gif?userKey={UserKey}
```

## Parameters

- **networkId**  
  Type: `int32`  
  Required: Yes  
  Description: Your account (network) ID

- **userKey**  
  Type: `string`  
  Required: Yes  
  Description: UserDB ID of the user

- **property**  
  Type: `string`  
  Description: Appends one or more key/value pairs to be shipped to UserDB logs. In the format `?property:Key1=Value&property:Key2=Value` etc.

## Example Request

```
curl --request GET \
     --url 'https://e-networkId.adzerk.net/udb/networkId/set/i.gif?userKey=UserKey' \
     --header 'accept: text/plain'
```

[Returns a 1x1 transparent GIF image]