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SEOSEOPaid AcquisitionPaid acquisitionProgrammaticWebsite MonetizationProgrammaticApp UAApp MonetizationWebsite monetizationKeyword ResearchSearch IntentApp acquisitionROASCPAApp monetizationCPCLTVAffiliateeCPMRPMRetail MediaAttributionConversion TrackingCreative IntelMMPHeader BiddingDSPSSPRTBAd ViewabilityFill RateASOSKAdNetworkARPDAURewarded VideoAd MediationAffiliateCreative TestingA/B TestingRetargetingLookalike AudiencesCampaign OptimizationBrand SafetySupply Path

Programmatic

OpenX

Free

OpenX is an independent, cloud-based supply-side platform and programmatic exchange serving publishers, advertisers, and agencies. It provides auction infrastructure, demand access, identity and audience solutions, deal and curation workflows, quality controls, and reporting across display, mobile, video, and connected television inventory. It is best suited to larger media owners seeking diversified programmatic revenue and buyers that want direct, measurable access to premium open-web supply, especially when sustainability, inventory quality, and custom marketplace arrangements are important selection criteria.

Monetizationsell-side platformad exchangepremium inventoryaudience targeting

What it does

OpenX is an independent supply-side platform and programmatic exchange that was among the first ad-tech companies to run entirely on public cloud and to achieve net-zero carbon certification, which it uses as a differentiator with sustainability-minded buyers. Publishers route display, mobile, video, and connected TV inventory through OpenX to reach demand-side platforms via header bidding, open auctions, private marketplaces, and curated deals. Its OpenAudience product links first-party publisher data to a people-based identity graph, helping buyers target and measure without third-party cookies. OpenX emphasizes inventory quality and supply-path efficiency, deliberately pruning low-value sellers so buyers see cleaner, more direct routes to premium open-web supply, which appeals to agencies consolidating their programmatic spend onto fewer trusted exchanges.

Where it fits

It operates as a sell-side exchange linking publisher inventory to programmatic demand while giving buyers a streamlined, quality-filtered supply path.

Core features

  • Fully cloud-based exchange with net-zero carbon operations
  • OpenAudience people-based identity and data activation
  • Header bidding, open auction, and private marketplace support
  • Supply-path optimization with aggressive inventory-quality filtering
  • Curation and deal workflows for agency buyers
  • Cross-format coverage across display, mobile, video, and CTV

Best for

  • Publishers wanting a quality-focused, sustainable exchange
  • Agencies consolidating spend onto fewer trusted SSPs
  • Buyers needing cookieless audience targeting

Beginner notes

  1. OpenX competes on inventory quality and sustainability rather than sheer scale, so evaluate it on supply cleanliness, not just reach.
  2. OpenAudience matters most for cookieless targeting; ignore it until you have a first-party data strategy.
  3. If a DSP recommends 'supply-path optimization,' OpenX is often one of the few exchanges kept—understand why before cutting others.
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Comparisons & guides featuring this tool

Concepts behind this tool

SSP

An SSP helps publishers sell and optimize advertising inventory.

Ads.txt and App-ads.txt

Public text files that let publishers declare which companies are authorized to sell their ad inventory, cutting off counterfeit and unauthorized reselling.

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