# Magnite

**Canonical:** https://apis.io/providers/magnite/  
**Website:** https://www.magnite.com  
**APIs profiled:** 1

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.

## Kin Score — 53.5 / 100 (developing)

Scored 2026-08-17 under rubric 0.11.0. Trend: rising (+34.0 from 19.5).

| Facet | Score |
|---|---|
| Discoverability | 87.0 |
| Contract Quality | 49.4 |
| Governance | 20.8 |
| Operational Transparency | 36.8 |
| Developer Ergonomics | 65.2 |
| Commercial Clarity | 60.5 |

## Agent readiness — 55.9 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | yes |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | partial |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | yes |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Enterprise contract — onboarding: unknown, pricing: unknown, trial: no (confidence: high).

## APIs (1)

- **SpringServe UI API** — The SpringServe ad server REST API — the machine-readable core of Magnite Streaming. Two versions run concurrently: v0 (289 operations, 173 paths) and v1 (379 operations, 295 pa...

## Agentic access (1)

- **Magnite Agentic Access** — 668 operations · 349 acting · 1 human-in-the-loop

## Security (3)

- **Magnite Authentication** — apiKey/http · 2 schemes
- **Magnite Domain Security** — TLSv1.3 · HSTS · DMARC
- **Magnite Trust Center** — SOC 2 Type I, JICDAQ, ISO 27001

## Plans (1)

- **Magnite Plans Pricing**

## Tags

Advertising, Programmatic Advertising, Sell-Side Platform, SSP, Connected TV, CTV, OTT, Streaming, Display Advertising, Video Advertising, OpenRTB, Header Bidding, Ad Tech, Publisher Monetization, Demand-Side Integration, Ad Server, Deal Curation, Reporting API, Agent Readiness, OpenAPI

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/magnite/). Scores are computed from the provider's own public artifacts under a published rubric.