PubMatic OpenWrap: the Prebid-based wrapper, its server side, SDK and pricing model

OpenWrap is one of PubMatic's add-on products. The company's annual report calls it "our header bidding solution" and says such products are sold on their own or together with the main platform (PubMatic 10-K, FY2025). Prebid.org's list of managed services describes it as an enterprise wrapper for Prebid.js and Prebid Server, run from a cloud interface (Prebid.org, accessed 9 November 2026).

The product is older than most hosted Prebid offers. PubMatic's first annual report as a listed company says OpenWrap was released in April 2016 (PubMatic 10-K, FY2020). The same filing says it reached app developers in 2017, gained an app SDK in 2019 and added OTT and CTV header bidding in 2020. It also calls the 2017 release "the industry's first hybrid client and server side wrapper" (company claim).

If you are searching for managed Prebid Server hosting from PubMatic, OpenWrap is the product name to use. The basics of wrappers are in header bidding explained.

OpenWrap has four parts. The table shows what public sources say about each one.

The server side is the easiest part to inspect. A GitHub account named PubMatic-OpenWrap keeps a fork of the official Prebid Server repository, written in Go and last updated on 6 November 2026 (GitHub, accessed 9 November 2026). Its main branch holds a module at modules/pubmatic/openwrap that the upstream project does not have.

The file names in that module tell you where PubMatic's logic sits. It hooks into Prebid Server at the entry point, before validation and on the auction response. It also contains code for A/B tests, adapter throttling, price floors, ad pods, AppLovin MAX and a component named aps (GitHub module). That is a clean use of Prebid's module system, but it carries a cost: every upstream release has to be merged into the fork.

Upstream moves fast. The official Go server shipped 13 tagged releases between January and early November 2026, the latest being v4.11.1 on 2 November (GitHub releases). Why the Go and Java builds differ, and what that means for a host, is in Prebid Server Go vs Java.

For streaming TV, the server-side design matters most, because video players and server-side ad insertion cannot run a browser wrapper. PubMatic said in 2019 that Frankly Media had adopted OpenWrap's server-to-server support for video and OTT (PubMatic, 11 September 2019).

PubMatic does not publish OpenWrap prices. In September 2019 it said publishers could choose "revenue share or a platform-based license model" (PubMatic, 11 September 2019). Its FY2020 annual report warned that newer products such as OpenWrap use "different pricing approaches" from its core fees (10-K, FY2020).

The core fee is different. PubMatic says it earns revenue mainly from publisher fees that are "generally a percentage" of the value of impressions sold on its platform (10-K, FY2025). A publisher may therefore pay twice in effect: a wrapper fee, and exchange fees on impressions PubMatic wins.

Points to settle in a contract:

• Does the licence or revenue share include server hosting, or is that billed apart?
• Are web, SDK and OTT priced as one product or three?
• How soon after an upstream Prebid Server security release is the fork patched?
• Can you export raw bid data from the server, including bids from rival exchanges?

Strengths

• Long track record. OpenWrap has been on the market since April 2016 (10-K, FY2020).
• One product family across screens. Web, app and OTT versions share one name and one vendor (10-K, FY2020).
• Server code you can read. The fork and its module are public, so your engineers can see what runs between the request and the bidders (GitHub).
• A voice in Prebid. PubMatic holds a seat on Prebid.org's board (Prebid.org, accessed 9 November 2026).

Limits

• The host is also an exchange. PubMatic runs a sell-side platform that bids for the same impressions (10-K, FY2025). Compare win rates in your own analytics.
• Fork maintenance. A fork can trail upstream fixes. Prebid published critical advisories for the Go server on 8 June 2026 (GitHub advisory), and PubMatic does not publish its patch timing.
• Thin public documentation. Beyond Prebid.org's listing, the filings and the fork, we found no public technical specification.
• App mediation still in beta. Google labels the OpenWrap SDK adapter for AdMob as beta (Google for Developers).

• Any OpenWrap rate, revenue share, licence fee or minimum term.
• How many publishers use OpenWrap today. PubMatic's own web pages carry counts that we could not re-check on 9 November 2026.
• Whether every hosted OpenWrap account runs on the public fork, and how often the fork is synced with upstream.
• The OpenWrap SDK launch date: the FY2020 10-K says 2019, while a PubMatic release found in search is dated February 2020.
• Uptime, latency and data-centre regions for OpenWrap's servers.

1. PubMatic, Inc., Form 10-K for fiscal year 2025 (filed 26 February 2026). https://www.sec.gov/Archives/edgar/data/1422930/000142293026000010/pubm-20251231.htm
2. PubMatic, Inc., Form 10-K for fiscal year 2020 (filed 26 March 2021). https://www.sec.gov/Archives/edgar/data/1422930/000142293021000009/pubmatic202010-k.htm
3. US Securities and Exchange Commission, EDGAR submissions record for PubMatic, Inc. (accessed 9 November 2026). https://data.sec.gov/submissions/CIK0001422930.json
4. PubMatic, "PubMatic releases industry-first independent omni-channel wrapper solution", press release on StreamingMedia.com (11 September 2019). https://www.streamingmedia.com/PressRelease/PubMatic-releases-industry-first-independent-omni-channel-wrapper-solution._49949.aspx
5. Prebid.org, Managed Services: PubMatic (accessed 9 November 2026). https://prebid.org/managed_services/pubmatic/
6. GitHub, PubMatic-OpenWrap/prebid-server, fork of prebid/prebid-server (last pushed 6 November 2026; accessed 9 November 2026). https://github.com/PubMatic-OpenWrap/prebid-server
7. GitHub, PubMatic-OpenWrap/prebid-server, modules/pubmatic/openwrap (accessed 9 November 2026). https://github.com/PubMatic-OpenWrap/prebid-server/tree/master/modules/pubmatic/openwrap
8. GitHub, prebid/prebid-server release v4.11.1 (2 November 2026). https://github.com/prebid/prebid-server/releases/tag/v4.11.1
9. GitHub, prebid/prebid-server security advisory GHSA-4p3g-4hcj-wpvx (8 June 2026). https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx
10. Google for Developers, "Integrate PubMatic OpenWrap (Beta) with mediation", Android (accessed 9 November 2026). https://developers.google.com/admob/android/mediation/pubmatic