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. In June 2026 Horizon launched an agentic integration layer around Blu — a set of Blu audience APIs, MCP endpoints and agent-based integration points that ad-tech, media-owner and martech partners can build on — but that surface is partner-gated: Horizon publishes no developer portal, no API reference, no OpenAPI or other machine-readable contract, no SDKs in any public registry, and its GitHub organization has zero public repositories. The only route to the API is the corporate contact form. All platforms documented here are proprietary systems reachable through a commercial partnership rather than open developer APIs.
More than an index entry, but the surface is still mostly links rather than artifacts — the cohort most likely to move a full band from modest, well-targeted work.
API Evangelist profiles Horizon Media the way a machine reads it — 4 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 15.2/100 (emerging), with a separate agent-readiness read of 3/100 (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.
Why this profile is thin
Horizon markets Blu audience APIs and MCP integration points to partners (2026-06-18 launch), but the only route to them is the corporate "interested" contact form — there is no developer subdomain (developer/api/docs/blu/partners.horizonmedia.com all fail to resolve), no reference, and no spec at any probed path.
An API exists — we simply could not reach the contract without credentials or a sales conversation. This one is Horizon Media's to change: publishing the reference and a machine-readable spec at a public URL, while keeping key issuance behind whatever gate they like, would let an integrator evaluate the API before committing to a call.
What we probed
https://www.horizonmedia.com/interested→ HTTP 200https://www.horizonmedia.com/openapi.json→ HTTP 404https://www.horizonmedia.com/llms.txt→ HTTP 404https://www.horizonmedia.com/.well-known/api-catalog→ HTTP 404https://api.github.com/orgs/HorizonMedia/repos→ HTTP 200
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
Put this on your own site. The badge is drawn live from Horizon Media's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/horizon-media/"
title="Horizon Media on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/horizon-media.svg"
alt="Horizon Media Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/horizon-media/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/horizon-media/"
title="Horizon Media on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/horizon-media/card.svg"
alt="Horizon Media Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
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.
Pricing 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.
Horizon Media Rate Limits
RATE LIMITSSecurity 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.
Horizon Media Trust Center
SOC 2 Type 2, ISO/IEC 27001:2022, ISO/IEC 27701:2019, ISO/IEC 42001:2023, HITRUST, HIPAA
SECURITYResources
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.
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 1
Pagination, idempotency, versioning, errors, and events
Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 3
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 12
The organization behind the API
Scroll within the panel for all 12 ·
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
This is an independent, third-party profile of Horizon Media, 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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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.