Where do the default macro values come from?

They follow OpenRTB 2.6 §4.6: ${AUCTION_ID} from the response id (or request id), ${AUCTION_BID_ID} from bidid, ${AUCTION_IMP_ID} from the bid impid, ${AUCTION_SEAT_ID} from the seat, ${AUCTION_PRICE} from the bid price, ${AUCTION_CURRENCY} from cur, ${AUCTION_MBR} 1.000. ${AUCTION_LOSS} is picked from the AdCOM loss reason list. Every value is editable.

What is checked when I paste the paired BidRequest?

Response id vs request id, response currency vs the request cur[] list, that every bid targets an impid that exists, that the price is not below the impression floor, and that the media type declared by mtype is allowed by the impression (banner / video / audio / native).

How is the adm classified?

By sniffing the markup: a root is video, JSON with a native root or assets[] + link is native, HTML tags mean a display creative, and getVPAIDAd() marks a VPAID JS unit. Mismatches with the declared mtype are surfaced as warnings.

Is the creative preview safe to run?

The markup renders in an iframe with sandbox="allow-scripts allow-popups" and an opaque origin, so it cannot read cookies, reach this page or navigate it. Clicks are captured instead of followed. Open it in the Ad Tag Tester for the full network and timing breakdown.

Bid Response Inspector

Paste an OpenRTB 2.x BidResponse (or send one from the Request Builder / Bidder Sandbox) to get a seat-by-seat bid table with price, currency, adomain, creative id, deal id, size, media type and adm classification (HTML, VAST, native JSON, VPAID). The inspector validates the schema, explains nbr no-bid reasons, cross-checks against a paired BidRequest (impid match, floors, currency, allowed media types), lists every ${AUCTION_*} macro in adm/nurl/burl/lurl with a form to substitute values, fires win/billing/loss notices through the FizzKit relay with status and latency, and previews HTML creatives in a sandboxed frame with mini network and console panels.

Fetches URLs via the FizzKit relay — nothing is stored

Paste a BidResponse to decode bids, macros and creatives; pair it with the request for consistency checks

BidResponse

{
  "id": "80ce30c53c16e6ede735f123ef6e32361bfc7b22",
  "bidid": "bid-resp-9f2a",
  "cur": "USD",
  "seatbid": [
    {
      "seat": "seat-42",
      "bid": [
        {
          "id": "b-1",
          "impid": "1",
          "price": 1.75,
          "adid": "ad-7834",
          "crid": "creative-7834",
          "cid": "campaign-12",
          "dealid": "pmp-deal-3",
          "adomain": ["example-advertiser.com"],
          "cat": ["IAB3-1"],
          "w": 300,
          "h": 250,
          "mtype": 1,
          "attr": [6],
          "nurl": "https://dsp.example.com/win?auction=${AUCTION_ID}&bid=${AUCTION_BID_ID}&imp=${AUCTION_IMP_ID}&price=${AUCTION_PRICE}&cur=${AUCTION_CURRENCY}",
          "burl": "https://dsp.example.com/bill?bid=${AUCTION_BID_ID}&price=${AUCTION_PRICE}&mbr=${AUCTION_MBR}",
          "lurl": "https://dsp.example.com/loss?bid=${AUCTION_BID_ID}&reason=${AUCTION_LOSS}&min=${AUCTION_MIN_TO_WIN}",
          "adm": "<a href=\"https://example-advertiser.com/landing?price=${AUCTION_PRICE}&seat=${AUCTION_SEAT_ID}\" target=\"_blank\"><img src=\"https://placehold.co/300x250/4f46e5/ffffff.png?text=Bid+1+300x250\" width=\"300\" height=\"250\" style=\"border:0;display:block\" alt=\"\"></a><img src=\"https://placehold.co/1x1/ffffff/ffffff.png?imp=${AUCTION_ID}\" width=\"1\" height=\"1\" style=\"display:none\" alt=\"\">",
          "exp": 300
        }
      ]
    },
    {
      "seat": "seat-video",
      "bid": [
        {
          "id": "b-2",
          "impid": "2",
          "price": 12.5,
          "crid": "video-creative-1",
          "adomain": ["brand.example"],
          "w": 640,
          "h": 480,
          "mtype": 2,
          "burl": "https://video-dsp.example/bill?p=${AUCTION_PRICE}&id=${AUCTION_ID}",
          "adm": "<VAST version=\"4.2\"><Ad id=\"1\"><InLine><AdSystem>FizzKit</AdSystem><AdTitle>Sample video bid</AdTitle><Impression><![CDATA[https://video-dsp.example/imp?price=${AUCTION_PRICE}]]></Impression><Creatives><Creative><Linear><Duration>00:00:15</Duration><TrackingEvents><Tracking event=\"start\"><![CDATA[https://video-dsp.example/t?e=start]]></Tracking></TrackingEvents><VideoClicks><ClickThrough><![CDATA[https://brand.example/]]></ClickThrough></VideoClicks><MediaFiles><MediaFile delivery=\"progressive\" type=\"video/mp4\" width=\"640\" height=\"360\" bitrate=\"800\"><![CDATA[https://storage.googleapis.com/gvabox/media/samples/stock.mp4]]></MediaFile></MediaFiles></Linear></Creative></Creatives></InLine></Ad></VAST>"
        }
      ]
    }
  ]
}

2,530 chars · 49 lines

Response id: 80ce30c53c16e6ede735f123ef6e32361bfc7b22
bidid: bid-resp-9f2a
Currency: USD
Imps bid: 2

Seat / bid	imp	Price	Size	Type	adm	adomain	crid	deal	Notices	Macros
seat-42 b-1	1	1.75 USD	300×250	Banner	HTML	example-advertiser.com	creative-7834	pmp-deal-3	nurlburllurl	9
seat-video b-2	2	12.5 USD	640×480	Video	VAST	brand.example	video-creative-1	—	nurlburllurl	2

No warnings.

Seats

Bids

Top price

12.5 USD

Avg price

7.125

Currency

USD

adm kinds

HTML, VAST

Macros

Warnings

OpenRTB Request Builder

Build OpenRTB 2.6 bid requests with a form or JSON, then send them to any bidder and inspect the response.

RTB Bidder Sandbox

A live OpenRTB bidder endpoint that captures every bid request and answers with bids, no-bids, custom templates or timeouts.

OpenRTB Inspector

Validate & annotate OpenRTB 2.6 BidRequest and BidResponse JSON.

Ad Tag Tester

Render a display ad tag in a sandboxed frame and see every request, click-through, console line and load time.

VAST Inspector

Fetch or paste VAST 2/3/4 tags — follow wrapper chains, validate, ping pixels, and play media files.

VAST Ad Tester (IMA Player)

Play any VAST or VMAP tag in a real Google IMA player and watch every SDK event, error and timing.

How to use Bid Response Inspector

1Paste a BidResponse JSON or load the sample; optionally expand the paired BidRequest box for consistency checks.
2Read the Summary table and warnings, then the Validation tab for schema errors and the Fields tab for annotated, enum-decoded values.
3Open Macros to see every ${AUCTION_*} token, adjust the values and fire nurl, burl or lurl to check the endpoint response.
4Open Creative to render an HTML bid, or hand a VAST adm to the VAST Inspector / IMA player.

About Bid Response Inspector

Bid Response Inspector is part of FizzKit — a collection of focused developer and ad-tech tools. This tool uses the FizzKit relay to fetch public URLs on your behalf (so browser CORS rules do not get in the way); fetched content is returned to your browser and not stored.

Frequently asked questions

It sends one GET request to the macro-substituted URL through the FizzKit relay (server-side, no cookies, 10 s timeout) and shows the status code, latency and final URL after redirects. Firing a real burl tells the bidder it was billed, so use it against test endpoints or your own Bidder Sandbox.

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