> For the complete documentation index, see [llms.txt](https://docs.exads.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.exads.com/rtb/advertisers/open-rtb/open-rtb-advertisers-response-2p5.md). # Prebid / OpenRTB 2.5 Bid Response *** {% hint style="info" %} **Note**: The Prebid / OpenRTB 2.5 Bid Response will work with both Prebid and standard OpenRTB 2.5. You can read more about Prebid Server [here](https://docs.prebid.org/prebid-server/endpoints/openrtb2/pbs-endpoint-auction.html). {% endhint %} *** The response for a bid request has the following structure: ## Bid Response Object | Attribute | Required? | Description | | --------- | --------- | ------------------------------------------------------------------- | | id | Yes | ID of the bid request, must match id sent in the request (string) | | seatbid | Yes | Collection of bids made by the bidder on behalf of a specific seat. | ### seatbid | Attribute | Required? | Description | | --------- | --------- | ------------------------------------------------------------------------------------------------- | | bid | Yes | ID of the impression object to which this bid applies, must match id sent in the request (string) | ### seatbid.bid | Attribute | Required? | Description | | --------- | --------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | id | Yes | ID for the bid object chosen by the bidder (string) | | impid | Yes | ID of the impression object to which this bid applies (string) | | price | Yes | Bid price in CPM or CPC (float) | | adm | Yes | Ad markup (string) | | nurl | No | Win notification URL, it is recommended to use HTTP over HTTPS for nurl (string) - not mandatory | | burl | No | Billing notification URL, called by EXADS when the impression or click becomes billable (CPM or CPC, per the `btype` field), so it can be counted from the billable event instead of the pixel. Recommended to use HTTP over HTTPS for burl (string) | | ext | No | EXADS specific extension (object) | ### seatbid.bid.ext | Attribute | Required? | Description | | --------- | ----------- | --------------------------------------------------------------------------------------------------------------------------------------- | | btype | Recommended | Pricing Model. Values: 1 = CPM, 2 = CPC. Default = 1 (int). **Note**: When response is for an Email Clicks zone request, 1 = Smart CPC. | ## JSON Examples ### Banner (Stored Request): JSON ```json { "id": "c1218af9-65fc-4d55-9ad6-8795c2daad25", "seatbid": [ { "bid": [ { "id": "7565485375107751077", "impid": "some-impression-id", "price": 17.076291896620397, "adm":"", "adid": "266959495", "adomain": [ "https://www.tudublin.ie" ], "iurl": "https://fra1-ib.adnxs.com/cr?id=266959495", "cid": "1212", "crid": "266959495", "w": 300, "h": 250, "ext": { "prebid": { "targeting": { "hb_bidder": "asqClassic", "hb_bidder_asqClassic": "asqClassic", "hb_pb": "17.00", "hb_pb_asqClassic": "17.00", "hb_size": "300x250", "hb_size_asqClassic": "300x250" }, "type": "banner", "video": { "duration": 0, "primary_category": "" } }, "bidder": { "appnexus": { "brand_id": 791377, "auction_id": 3048506780519985986, "bidder_id": 101, "bid_ad_type": 0 } } } } ], "seat": "asqClassic" }, { "bid": [ { "id": "613673EF-A07C-4486-8EE9-3FC71A7DC73D", "impid": "some-impression-id", "price": 3.2940788932, "adm": "", "adomain": [ "www.addomain.com" ], "iurl": "http://localhost11", "crid": "FP_336x280_00", "w": 336, "h": 280, "ext": { "prebid": { "targeting": { "hb_bidder_pubmatic": "pubmatic", "hb_pb_pubmatic": "3.25", "hb_size_pubmatic": "336x280" }, "type": "banner", "video": { "duration": 0, "primary_category": "" } }, "bidder": { "dspid": 6, "BidType": 0 } } } ], "seat": "pubmatic" } ], "cur": "EUR" } ``` ## ADM Examples The examples below shows example of the HTML used in this ADM parameter. ### Banner: HTML ```xml ``` ## No Bid Response To answer a bid request without making an actual bid, an HTTP response code 204 "No Content" should be sent. ## Billing Notification If the parameter **Bid Response Object -> Seat Bid Object -> Bid Object -> burl** is in the bid response and is a valid URL, EXADS will send a GET request to it when the impression or click becomes billable (CPM or CPC, per the `btype` field). This allows the event to be counted from the billable server-to-server event rather than from pixel-based tracking. If both `nurl` and `burl` are present, both will be called. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.exads.com/rtb/advertisers/open-rtb/open-rtb-advertisers-response-2p5.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. 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