# Open RTB
Adnuntius provides limited support for requesting ads using the [version 2.5 of the OpenRTB protocol](https://www.iab.com/wp-content/uploads/2016/03/OpenRTB-API-Specification-Version-2-5-FINAL.pdf).
**Note**: Please contact Adnuntius if you intend to use this functionality, as your account will require some additional configuration.
## Requests
OpenRTB Requests are sent to: `https://delivery.adnuntius.com/rtb`
An example request looks like this:
```javascript
{
"id": "123457893528",
"at": 2,
"bcat": ["IAB1-1"],
"badv": ["uggs.com", "acme.co"],
"imp": [
{
"id": 1,
"tagid": "ab45ef1",
"bidfloor": 0.0,
"bidfloorcur": "USD",
"banner": {
"w": 728,
"h": 90
}
}
],
"site": {
"id": "site123",
"page": "https://example.com/page",
"publisher": {
"id": "pub123"
}
},
"device": {
"ua": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:15.0) Gecko/20100101 Firefox/15.0.1",
"ip": "203.0.113.128"
},
"user": {
"id": "1kjh3429kjh295jkl"
}
}
```
The table below provides further information about *some* of the fields in the request.
| Field | Description |
| --------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `id` | A unique identifier for the request |
| `bcat` | A list of blocked categories (using version 1.0 of the IAB Content Taxonomy). For this blocking to work, the Advertiser in Adnuntius must specify an IAB category |
| `badv` | A list of blocked advertiser domains. For this blocking to work, the Advertiser in Adnuntius must specify an advertiser URL |
| `imp.tagId` | The Adnuntius Ad Unit Tag ID for the request |
| `imp.banner.w` | The ad unit width |
| `imp.banner.h` | The ad unit height |
| `site.domain` | The site domain. Advertisers can use this to target or block specific domains |
| `site.cat` | The site categories. Advertisers can use this to target or block specific categories |
| `site.keywords` | The site keywords. Advertisers can use this to target or block specific keywords |
| `device.au` | User Agent string. Advertisers can use this to target device types and operating systems etc. |
| `device.ip` | Ip address. Advertisers can use this for location targeting |
## Response
An example response looks like this:
```javascript
{
"id": "123457893528",
"bidid": "f7dc923428a3a86259960e27fcd60776"
"cur": "USD",
"seatbid": [
{
"bid": [
{
"adid": "e8669e93-622f-4655-b5b8-77f2f5ce7748",
"price": 0.01,
"adm": "\n\n\n\n\n\n\n
![](\"https://assets.adnuntius.com/cdn/b055gUPRpZh_dLTPWKnO_dv7xTr-Bu1fRRvla4PTXLg.png\")