A supply-side platform (SSP) is the technology layer through which CTV publishers expose their ad inventory to programmatic buyers. In India, four platforms handle the majority of CTV SSP infrastructure: Google Ad Manager (the dominant force via JioHotstar), Magnite, PubMatic, and SpringServe. Understanding which SSP powers which publisher's inventory is essential for buyers activating deal IDs, planning reach, and diagnosing delivery problems.
What an SSP does
The SSP sits on the publisher side of the programmatic stack. Its core functions:
- Bid request generation: When a CTV ad break is available, the SSP packages impression data (content, device, audience signals, floor price) into an OpenRTB bid request and sends it to connected DSPs.
- Auction orchestration: Runs the auction among responding DSPs, applies the publisher's floor prices and deal priorities, selects the winning bid, and returns the winning creative to the CTV app or ad server.
- Deal management: Creates and manages PMP deal IDs, preferred deal parameters, and programmatic guaranteed line items on behalf of the publisher.
- Yield optimisation: Sets dynamic floors, manages header bidding competition among DSPs (server-side for CTV), and controls which DSP seats are active for which inventory segments.
- Reporting: Publisher-side reporting on fill rate, CPM delivered, buyer mix, and inventory performance.
Primary SSPs in India CTV
Google Ad Manager (GAM)
Google Ad Manager is the ad server and SSP infrastructure underlying JioHotstar — by far India's largest CTV inventory source. GAM handles both direct-sold and programmatic inventory for JioHotstar, with programmatic buying routed through Google's Ad Exchange (AdX). Buyers access JioHotstar programmatic inventory primarily through DV360 via AdX, though other DSPs with AdX seats can also bid. GAM's role in India CTV extends beyond JioHotstar: several mid-tier AVOD platforms and regional language OTT services also use GAM as their ad server, making it the single most important SSP infrastructure for India CTV reach.
Magnite
Magnite (formed from the merger of Rubicon Project and Telaria, with Telaria being the leading CTV SSP before the merger) is the most significant independent SSP for CTV globally and has a meaningful India presence. In India, Magnite is the SSP infrastructure for SonyLIV and several other premium streaming publishers. Magnite's CTV-specific capabilities — pod bidding, server-side header bidding (SSAI-compatible), and dedicated CTV auction mechanics — make it the preferred independent SSP choice for publishers that want to avoid Google's ecosystem. Buyers reach Magnite inventory through both DV360 and The Trade Desk, with TTD having particularly strong Magnite integration.
PubMatic
PubMatic is an Indian-founded SSP (headquartered in Redwood City, now publicly listed) with a strong India publishing base. On CTV, PubMatic powers programmatic inventory for Zee5 and several regional FAST channel publishers. PubMatic's OpenWrap is a server-side header bidding wrapper used by publishers running CTV apps that need to run competition among multiple DSPs simultaneously without client-side JavaScript. For buyers, PubMatic inventory is accessible through DV360 and TTD among others. PubMatic also has direct relationships with several India-based agency trading desks.
SpringServe
SpringServe is a video-specialist ad server and SSP (acquired by Magnite) focused on AVOD and FAST channel monetisation. It is particularly prevalent in India's FAST channel ecosystem, where it serves as both the ad decisioning layer and the SSP connecting FAST publishers to programmatic demand. Publishers using SpringServe benefit from its SSAI-compatible ad serving and pod management capabilities. Buyers accessing SpringServe-powered inventory typically do so through Magnite's SSP layer.
How SSPs connect to India publishers
The relationship between an India CTV publisher and its SSP determines the programmatic buying path for advertisers:
- JioHotstar → Google Ad Manager / AdX: DV360 buyers have the most reliable access. TTD and other DSPs bid via AdX open auction or through negotiated deal IDs where available.
- SonyLIV → Magnite: Accessible via DV360 and TTD. PMP deals negotiated through Magnite's deal creation interface.
- Zee5 → PubMatic: Accessible via DV360 and TTD via PubMatic's SSP. OpenWrap server-side header bidding runs for some inventory segments.
- FAST channels (Samsung TV Plus, LG Channels, regional publishers) → Magnite/SpringServe: Programmatic access varies by publisher. Some FAST inventory is exclusively direct-sold; programmatic FAST is growing but not uniformly available.
- Amazon Prime Video → Amazon's own ad tech: Not accessible via independent SSPs. Amazon Prime Video CTV inventory in India is bought through Amazon DSP only.
Most major India CTV publishers use a single primary SSP rather than running multi-SSP competition, which is different from the desktop/mobile display market where publishers often run four or more SSPs simultaneously. This makes the DSP-SSP-publisher mapping more direct and more critical to understand before campaign planning.
What buyers need to know about India's SSP landscape
Several SSP-level factors affect campaign delivery in India:
- SSP fee opacity: SSP take rates in India CTV are not always disclosed. Published CPMs from publishers may be net of SSP fees or gross — confirm with the SSP/publisher to ensure you are comparing equivalently structured numbers when evaluating CPM efficiency across publishers.
- Deal ID creation paths: PMP deal IDs in India are typically created by the publisher's SSP team, not the publisher directly. The contact for deal setup at JioHotstar is via Google AdX; at SonyLIV it is via Magnite's India sales team. Knowing who creates the deal ID saves significant activation time.
- Fragmented FAST access: India FAST channel inventory is not consolidated under a single SSP. Samsung TV Plus, LG Channels, and regional FAST publishers each have different monetisation setups. There is no single programmatic entry point for "all India FAST inventory" — it requires publisher-by-publisher activation.
- Pod bidding availability: Not all India CTV publishers have activated pod bidding (competitive bidding across all positions in an ad break simultaneously). Most India CTV inventory still uses sequential waterfall or limited server-side competition. This limits the yield optimisation strategies available to buyers trying to manage frequency across a pod.