> For the complete documentation index, see [llms.txt](https://kakaobusiness.gitbook.io/main/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kakaobusiness.gitbook.io/main/partner/kakaoadx_rtb/rtb.md).

# 카카오 RTB 연동

## 1. 개요

{% hint style="info" %}
카카오 SSP와 RTB 연동을 할 수 있으며, 하위 페이지들에서 kakao(Supply-Side)와 Partner사(Demand-Side, Bidder) 간에 Server-To-Server RTB 연동 프로토콜 명세를 확인할 수 있습니다.
{% endhint %}

## 2. 카카오 RTB 소개

### 2.1 RTB 흐름 순서

1. kakao에서 각 Partner사(이하 Bidder)들에게 Bid Request을 보낸다.
2. Bidder는 Bid Response을 통해서 입찰한다.

* 입찰을 포기하는 경우에도 No-Bid 형식으로 응답
* 허용된 응답시간(별도로 명시/협의) 안에 도착하지 않은 응답은 No-Bid로 처리

3. kakao는 실시간 경매를 통해 Winner 및 Price을 결정한다.
4. kakao는 낙찰된 Bidder(Winner)의 광고를 사용자(Audience)에게 노출한다.
5. kakao는 Winner에게만 Win Notice을 보내며, lurl을 담아 응답하는 경우 진 경우엔 Lose Notice를 호출한다.

### 2.2 RTB Server-To-Server Protocol

1. 전송 프로토콜은 HTTP POST Method와 JSON Body을 이용한다.
2. HTTP Request Header

* Open RTB Version (x-openrtb-version: 2.5, 2.6)
* Kakao RTB Version (x-kakaortb-version: 1.0.0)
* Data Format (Content-Type: application/json)
* Data Encoding (Accept-Encoding: gzip, Content-Encoding: gzip) 
  * 별도 협의 필요

3. HTTP Response

* HTTP 응답(Status Code)
  * 입찰할 경우 : 200 (with json body)
  * 입찰을 포기할 경우 : 204 (empty or json body with reason for not bidding with 200 OK)
  * 잘못된 입찰 요청(ex>Malformed Bid Request) : 400
* Open RTB(4.4.3)에 명시된 Ad Serving Approaches 중 Ad Served In the Bid 방식만 지원한다. (즉, Bid Response에 반드시 광고 소재가 포함되어야 한다.)


---

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