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FizzKit

RTB & Programmatic

9

A programmatic toolkit for SSP and DSP engineers: stand up a live bidder endpoint and watch OpenRTB bid requests arrive, build and send bid requests to any bidder, inspect and preview bid responses, validate OpenRTB 2.6 payloads, verify ads.txt against sellers.json, and run the eCPM, fill and revenue math.

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RTB Bidder Sandbox

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

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OpenRTB Request Builder

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

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Bid Response Inspector

Decode an OpenRTB BidResponse: bids, macros, no-bid reasons, creative preview and win/billing notice firing.

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OpenRTB Inspector

Validate & annotate OpenRTB 2.6 BidRequest and BidResponse JSON.

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All rtb & programmatic

User-Agent Parser

Parse any User-Agent — browsers, in-app webviews, CTV (Roku, Tizen, webOS, Fire TV), bots — merge Client Hints and get an OpenRTB device object.

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Ad Tag Tester

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

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RTB & Ad Revenue Calculator

eCPM, CPC, CPA and CPV conversions, fill and revenue projections, rev-share chains, bid shading, auction clearing and budget pacing.

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ads.txt / app-ads.txt Validator

Fetch any domain's ads.txt or app-ads.txt, validate it against the IAB 1.1 spec, follow SUBDOMAIN pointers, and cross-check every line against exchange sellers.json files.

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sellers.json Inspector

Fetch any exchange's sellers.json by domain, validate it against the IAB spec, cross-check a publisher's ads.txt against it, and resolve OpenRTB supply chains.

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Frequently asked questions

Yes. Each sandbox gets a unique https://fizzkit.net/bid/… URL that accepts OpenRTB POSTs (gzip supported) and answers with a configurable bid or no-bid, so you can point an exchange's test tool at it.