Observed Signal · Mar 13, 2026 · Product Launch · Source: AdExchanger · Impact: 4/5 · Sentiment: Positive
CAPIs: The Future of Measurable Performance in CTV
Streaming platforms are adopting conversion APIs (CAPIs) to bring performance-oriented measurement to connected TV (CTV). Netflix recently unveiled a conversion API aimed at helping advertisers prove outcomes; Roku also publishes a CAPI and an Ads API for its self-serve platform. CAPIs — already common on Meta, Google, Snap and LinkedIn — let brands send first‑party conversion data server‑to‑server to streaming ad platforms, reducing signal loss from privacy restrictions and improving targeting and attribution. Publishers and ad platforms hope these integrations will make CTV measurement more reliable, encourage marketers to allocate more media dollars to streaming, and accelerate the shift toward so‑called “performance TV.” Netflix also rolled out new buyer targeting via Amazon DSP and Yahoo’s DSP the same day it announced its CAPI.
Major streaming platforms (Netflix, Roku, Comcast) releasing CAPIs can materially improve CTV attribution and targeting, accelerating the shift to performance-oriented streaming ad buys and affecting media allocation across the industry.
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Key Takeaways & Evidence Grounding
- Netflix unveiled a conversion API (CAPI) designed to help advertisers prove outcomes.
- Roku has a CAPI and an Ads API for its self-serve ad platform; Roku promoted its CAPI in a February blog post.
- CAPIs are already used by Meta, Google, Snap and LinkedIn to connect advertiser first‑party conversion data for optimization and measurement.
- Comcast’s Universal Ads launched a conversion API last year as part of efforts to attract SMB and e‑commerce advertisers.
Connected Companies & Entities
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Related Market Signals & Shifts
Recent verified developments and strategic activity across this market segment.
Netflix Leverages CAPI; AI Innovations Transform Local News
Netflix announced a conversion API (CAPI) to help advertisers measure whether streaming ads drive actions, joining a broader CAPI trend among streaming platforms such as Roku. Starting in Q2, Netflix will offer expanded targeting capabilities to U.S. media buyers via Yahoo DSP and Amazon DSP, with plans to extend to additional markets later in the year. The newsletter also reports on local news publishers using AI — including The Philadelphia Inquirer’s work with OpenAI and Microsoft to scan meeting topics and launch new newsletters — and notes growing CFO involvement in marketing decisions as agencies pitch outcomes-based plans. Brief industry items include ad-tech security findings, moderator risks in AI annotation, legal actions involving chatbots, and hires: Sharona Sankar-King at Havas Media Network North America and Dovilė Buinickaitė promoted at Adform.
Netflix Boosts Ad Targeting with New DSP Partnerships
Netflix announced updates to its Ads Suite that expand audience targeting and outcome measurement for advertisers. The streamer is adding deeper integrations with Amazon’s DSP (enabling Amazon Audiences segments) and Yahoo DSP (activating Yahoo audience signals) for programmatic buys, with the integrations scheduled to go live in Q2 starting in the US and later expanding to other markets. Netflix also developed its own Conversion API (CAPI) tools to let advertisers connect marketing data—such as conversions and website activity—to Netflix’s ad platform to better attribute outcomes. The company has run tests of the CAPI tools with independent agency Tinuiti in the US and is broadening availability. These moves follow Netflix’s 2022 ad-tier launch and the rollout last year of its in-house advertising technology, reflecting a push to show measurable outcomes and give buyers more targeting confidence.
CTV Revolutionizes Ad Measurement: Bridging Sales and Streaming
AdExchanger argues that 2026 is the year connected TV (CTV) increasingly bridges upper‑funnel reach and lower‑funnel outcomes as streaming platforms adopt digital‑style measurement and attribution. Streaming players have built conversion APIs—Netflix reportedly built a CAPI and Comcast built a conversion API for Universal Ads—making it easier to tie ad exposures to sales in a way similar to Meta, LinkedIn and Pinterest. The piece highlights the growing importance of live sports moving to streaming (examples: Amazon’s Thursday Night Football; Super Bowl and Olympics simulcasts on Peacock and linear TV) while noting legal and regulatory friction around sports-rights shifts (litigation over NFL Sunday Ticket; a Fubo TV lawsuit). It also references Paramount’s acquisition of Warner Bros. Discovery, which increases scale for mega‑programmers but still leaves them smaller than Google, Meta and Amazon in media spend influence.
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