Magnite
Magnite, Inc. (NASDAQ: MGNI) is the world's largest independent sell-side advertising platform, headquartered in New York with major operations in Los Angeles. Formed in 2020 from the merger of Rubicon Project and Telaria, and expanded through the acquisitions of SpotX (2021), SpringServe (2021), and Streamr.ai (2025), Magnite operates an omnichannel SSP spanning Connected TV (CTV), online video, display, audio, and mobile in-app. Its flagship offering is the Magnite Streaming platform — a next-generation CTV/OTT solution that unifies the SpringServe ad server with Magnite's Streaming SSP — alongside DV+ for display/video web and mobile, ClearLine for agency self-service direct buying of premium video, and Magnite Access for first- and third-party data activation. Magnite connects publishers including Disney Advertising, Paramount, Roku, Samsung, LG Ad Solutions, and Warner Bros. Discovery to virtually all major DSPs, and Jounce Media's March 2025 Supply Path Benchmarking Report verified Magnite reaches 99% of US streaming supply on a dollar-weighted basis. The company exposes developer surfaces through the SpringServe REST API, the Magnite Streaming Public API, the Magnite Seller Platform / CTV Platform Public APIs, an OpenRTB v2.5 bidder integration, and iOS/Android in-app SDKs. The SpringServe UI API publishes a real, anonymously reachable OpenAPI 3.1.2 contract in two concurrent versions (v0, 289 operations; v1, 379 operations) from the Swagger UI at https://api.springserve.com/api-docs, with the callable base at https://console.springserve.com. The Magnite Streaming and Seller Platform reference material on help.magnite.com remains gated behind an authenticated partner login. In Q1 2026 Magnite reported $164.4M revenue with CTV crossing 51% of contribution ex-TAC for the first time.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Magnite the way a machine reads it — 85 machine-readable artifacts across 4 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Magnite scores 51.0/100 (developing), with a separate agent-readiness read of 29/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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How we profile Magnite
Each block below is one kind of artifact we hold for Magnite. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 77
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Magnite Account Partner Segments API
The Account Partner Segments API from Magnite — 3 operation(s) for account partner segments.
Magnite Accounts API
The Accounts API from Magnite — 23 operation(s) for accounts.
Magnite Advertiser Domain Lists API
The Advertiser Domain Lists API from Magnite — 9 operation(s) for advertiser domain lists.
Magnite App Bundle Lists API
The App Bundle Lists API from Magnite — 20 operation(s) for app bundle lists.
Magnite App Name Lists API
The App Name Lists API from Magnite — 21 operation(s) for app name lists.
Magnite Audiences API
The Audiences API from Magnite — 1 operation(s) for audiences.
Magnite Audios API
The Audios API from Magnite — 2 operation(s) for audios.
Magnite Auth API
Endpoints that provide authentication for the API
Magnite Bid Maps API
The Bid Maps API from Magnite — 2 operation(s) for bid maps.
Magnite Bills API
The Bills API from Magnite — 8 operation(s) for bills.
Magnite Campaigns API
The Campaigns API from Magnite — 2 operation(s) for campaigns.
Magnite Changelogs API
The Changelogs API from Magnite — 6 operation(s) for changelogs.
Magnite City Lists API
The City Lists API from Magnite — 6 operation(s) for city lists.
Magnite Connected Demand API
The Connected Demand API from Magnite — 3 operation(s) for connected demand.
Magnite Connected Supply API
The Connected Supply API from Magnite — 3 operation(s) for connected supply.
Magnite Content Categories API
The Content Categories API from Magnite — 1 operation(s) for content categories.
Magnite Country Lists API
The Country Lists API from Magnite — 6 operation(s) for country lists.
Magnite Creatives API
The Creatives API from Magnite — 6 operation(s) for creatives.
Magnite Creatives Audio API
The Creatives Audio API from Magnite — 2 operation(s) for creatives audio.
Magnite Creatives Filepaths API
The Creatives Filepaths API from Magnite — 2 operation(s) for creatives filepaths.
Magnite Creatives Tag API
The Creatives Tag API from Magnite — 2 operation(s) for creatives tag.
Magnite Creatives Tile API
The Creatives Tile API from Magnite — 2 operation(s) for creatives tile.
Magnite Creatives Video API
The Creatives Video API from Magnite — 2 operation(s) for creatives video.
Magnite Curated Marketplaces API
The Curated Marketplaces API from Magnite — 5 operation(s) for curated marketplaces.
Magnite Currencies API
The Currencies API from Magnite — 1 operation(s) for currencies.
Magnite Dashboards API
The Dashboards API from Magnite — 27 operation(s) for dashboards.
Magnite Deal Id Lists API
The Deal Id Lists API from Magnite — 9 operation(s) for deal id lists.
Magnite Deal Lists API
The Deal Lists API from Magnite — 15 operation(s) for deal lists.
Magnite Demand Labels API
The Demand Labels API from Magnite — 6 operation(s) for demand labels.
Magnite Demand Partners API
The Demand Partners API from Magnite — 2 operation(s) for demand partners.
Magnite Demand Tags API
The Demand Tags API from Magnite — 17 operation(s) for demand tags.
Magnite Direct Connection Clearing Terms API
The Direct Connection Clearing Terms API from Magnite — 2 operation(s) for direct connection clearing terms.
Magnite Direct Connections API
The Direct Connections API from Magnite — 2 operation(s) for direct connections.
Magnite Domain Lists API
The Domain Lists API from Magnite — 26 operation(s) for domain lists.
Magnite First Party Partner Segments API
The First Party Partner Segments API from Magnite — 2 operation(s) for first party partner segments.
Magnite Forecast API
The Forecast API from Magnite — 1 operation(s) for forecast.
Magnite Geo Lists API
The Geo Lists API from Magnite — 4 operation(s) for geo lists.
Magnite Global Fcap Pixels API
The Global Fcap Pixels API from Magnite — 6 operation(s) for global fcap pixels.
Magnite Hb Bid Maps API
The Hb Bid Maps API from Magnite — 6 operation(s) for hb bid maps.
Magnite Header Bidding Platforms API
The Header Bidding Platforms API from Magnite — 2 operation(s) for header bidding platforms.
Magnite Ip Lists API
The Ip Lists API from Magnite — 9 operation(s) for ip lists.
Magnite ISP Lists API
The ISP Lists API from Magnite — 11 operation(s) for isp lists.
Magnite Keys API
The Keys API from Magnite — 4 operation(s) for keys.
Magnite Magnite Programmatic API
The Magnite Programmatic API from Magnite — 1 operation(s) for magnite programmatic.
Magnite Metro Area Lists API
The Metro Area Lists API from Magnite — 6 operation(s) for metro area lists.
Magnite Notifications API
The Notifications API from Magnite — 7 operation(s) for notifications.
Magnite Operative API
The Operative API from Magnite — 2 operation(s) for operative.
Magnite Parameter Lists API
The Parameter Lists API from Magnite — 9 operation(s) for parameter lists.
Magnite Partner Segments API
The Partner Segments API from Magnite — 10 operation(s) for partner segments.
Magnite Permissions API
The Permissions API from Magnite — 2 operation(s) for permissions.
Magnite Postal Code Lists API
The Postal Code Lists API from Magnite — 6 operation(s) for postal code lists.
Magnite Publisher Id Lists API
The Publisher Id Lists API from Magnite — 9 operation(s) for publisher id lists.
Magnite Report API
The Report API from Magnite — 2 operation(s) for report.
Magnite Report Templates API
The Report Templates API from Magnite — 3 operation(s) for report templates.
Magnite Reports API
The Reports API from Magnite — 4 operation(s) for reports.
Magnite Run As API
The Run As API from Magnite — 4 operation(s) for run as.
Magnite Scanned Creative Lists API
The Scanned Creative Lists API from Magnite — 11 operation(s) for scanned creative lists.
Magnite Scheduled Reports API
The Scheduled Reports API from Magnite — 3 operation(s) for scheduled reports.
Magnite Search API
The Search API from Magnite — 14 operation(s) for search.
Magnite Segments API
The Segments API from Magnite — 9 operation(s) for segments.
Magnite Session API
The Session API from Magnite — 1 operation(s) for session.
Magnite State Lists API
The State Lists API from Magnite — 6 operation(s) for state lists.
Magnite Supply Labels API
The Supply Labels API from Magnite — 6 operation(s) for supply labels.
Magnite Supply Name Lists API
The Supply Name Lists API from Magnite — 11 operation(s) for supply name lists.
Magnite Supply Partners API
The Supply Partners API from Magnite — 2 operation(s) for supply partners.
Magnite Supply Routers API
The Supply Routers API from Magnite — 3 operation(s) for supply routers.
Magnite Supply Tags API
The Supply Tags API from Magnite — 9 operation(s) for supply tags.
Magnite System Settings API
The System Settings API from Magnite — 2 operation(s) for system settings.
Magnite Tag Creatives API
The Tag Creatives API from Magnite — 2 operation(s) for tag creatives.
Magnite Tiles API
The Tiles API from Magnite — 2 operation(s) for tiles.
Magnite Timezones API
The Timezones API from Magnite — 1 operation(s) for timezones.
Magnite User Accounts API
The entity that combines a User and an Account and defines the role the user plays on that account
Magnite Users API
The Users API from Magnite — 6 operation(s) for users.
Magnite Value Lists API
The Value Lists API from Magnite — 2 operation(s) for value lists.
Magnite Vendors API
The Vendors API from Magnite — 2 operation(s) for vendors.
Magnite Videos API
The Videos API from Magnite — 2 operation(s) for videos.
Magnite White Labels API
The White Labels API from Magnite — 1 operation(s) for white labels.
Scroll within the panel for all 77 ·
Open Collections 2
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
SpringServe UI API (V0)
OPEN COLLECTIONSpringServe UI API
OPEN COLLECTIONPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Magnite Rate Limits
RATE LIMITSSecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Magnite — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 5
Portal, sign-up, and the first successful call
Documentation 5
Reference material describing how the API behaves
Agent Surfaces 5
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 5
Pagination, idempotency, versioning, errors, and events
Build 9
SDKs, sample code, and the tooling you integrate with
Scroll within the panel for all 9 ·
Access & Security 4
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 8
The organization behind the API
Scroll within the panel for all 8 ·
Other 15
Properties that don't map to a standard resource type
Scroll within the panel for all 15 ·
← All providers · Data indexed from github.com/api-evangelist/magnite · machine-readable index on apis.io
This is an independent, third-party profile of Magnite, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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