Horizon Media
Horizon Media is the largest independent media agency in the United States, founded in 1989 by Bill Koenigsberg and headquartered at 75 Varick Street in New York with offices in Los Angeles and Toronto. The agency employs roughly 2,300+ people, is ranked the third largest US media agency by COMvergence, and manages an estimated $8.7 billion in billings. Horizon operates a portfolio of specialty units (Horizon Next for performance, Blue Hour Studios for social/creator, Night Market for retail media, Scout Sports for sponsorship via Horizon Sports & Experiences, and the WHY Group for cultural insights) and runs a proprietary data and AI stack anchored by the Blu platform. In 2025 Horizon formed Horizon Global, a 50/50 US joint venture with Havas positioned at roughly $20 billion in combined billings, merging Blu with Havas Converged into a shared platform branded BluConverged, and is also building Horizon OS (Open Sphere) as an orchestration layer over the programmatic ad-tech stack. Horizon Media does not publish any public developer APIs, OpenAPI specifications, SDKs, or external developer portals, and its GitHub organization is private. All platforms documented here are internal/client-facing proprietary systems rather than open developer APIs.
Index entry only — little beyond a description and a link, and nothing machine-readable enough for an agent to act on without a human reading the site first.
API Evangelist profiles Horizon Media the way a machine reads it — 2 machine-readable artifacts, 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 — Horizon Media scores 9.0/100 (minimal), with a separate agent-readiness read of 0/100 (human only). 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.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Horizon Media
Each block below is one kind of artifact we hold for Horizon Media. 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.
Security Posture 2
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.
Resources
Every other property we hold for Horizon Media — 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.
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Company 10
The organization behind the API
Scroll within the panel for all 10 ·
Other 25
Properties that don't map to a standard resource type
Scroll within the panel for all 25 ·
← All providers · Data indexed from github.com/api-evangelist/horizon-media · machine-readable index on apis.io