OpenX
OpenX is an independent supply-side platform (SSP) and programmatic ad exchange headquartered in Pasadena, California, founded in 2008. OpenX connects publishers and app developers to advertiser demand through a real-time marketplace that runs OpenRTB-based auctions across display, video, CTV, native, and mobile inventory. Its product suite is organized around the OpenX Exchange (the core marketplace), OpenXSelect (curation, deal creation, and supply-path targeting), OpenXBuild (real-time bidstream enrichment, auction insights, and identity resolution), and OpenXControl (publisher yield management and demand routing). OpenX runs five developer surfaces on api.openx.com: a REST Platform API (v4) for accounts, inventory, orders, deals, and targeting; a Reporting API for asynchronous CSV report generation across 41 dimensions and 9 metrics; an OpenXSelect GraphQL API for audiences, segments, deals, and bidder objects; an OpenXBuild Real-Time Bidstream API that a partner implements as a containerized enrichment service (HTTP POST /openrtb25 plus an IAB Agentic RTB Framework gRPC RTBExtensionPoint); and an undocumented but live remote MCP server. Authentication is OAuth 2.0 authorization-code with PKCE fronted by Google Cloud Identity Platform, published through real OIDC and RFC 9728 discovery documents, with a separate 90-day x-apikey credential for the GraphQL API. OpenX publishes no OpenAPI, no Postman collection, no status page, no pricing, and no security.txt, and its documentation site currently renders as a broken single-page-app shell whose underlying content survives only as a JSON search index. The company is a major contributor to the Prebid.org header-bidding ecosystem and maintains a large GitHub organization, though its first-party API client libraries were last released to a package registry in 2021 and still target a legacy OAuth 1.0 login host that now returns HTTP 502. The business model is transaction-fee based, and API access requires an active OpenX account and BD/account-management onboarding rather than self-service signup.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles OpenX the way a machine reads it — 12 machine-readable artifacts across 5 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 — OpenX scores 34.4/100 (thin), with a separate agent-readiness read of 41/100 (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 OpenX
Each block below is one kind of artifact we hold for OpenX. 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 5
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.
OpenX Platform API
JSON REST API (v4) for the OpenX ad server. Sixteen CRUD objects (account, ad, adunit, adunitgroup, comment, creative, deal, floorrule, lineitem, optimization, order, package, p...
OpenX Reporting API
Asynchronous reporting API for authorized OpenX publishers. POST generateReport with dimensions, metrics, filters, reportType (HOURLY|DAILY) and an ISO-8601 date range returns a...
OpenXSelect API
GraphQL API (BETA) for the OpenXSelect curation platform — query providers, segments, audiences, deals and packages, and mutate audiences (create/update/archive/activate), deals...
OpenX MCP Server
Live remote Model Context Protocol server at https://api.openx.com/mcp. Discovered by probe, not by documentation — OpenX does not mention MCP anywhere in its published docs, bu...
OpenXBuild Real-Time Bidstream API
An inverted API — OpenX is the caller. A partner implements an enrichment service that OpenX hosts as a container inside its own Kubernetes namespace and calls in the auction pa...
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
OpenX MCP Server
MCP SERVERGraphQL 1
Where a provider ships GraphQL, the schema is the contract. We profile it alongside the REST surface so the whole interface is legible in one place.
GraphQL schemas published by this provider.
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.
Openx Plans Pricing
PLANSRate 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.
Openx 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.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Resources
Every other property we hold for OpenX — 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 3
Portal, sign-up, and the first successful call
Documentation 4
Reference material describing how the API behaves
Agent Surfaces 3
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 13
SDKs, sample code, and the tooling you integrate with
Scroll within the panel for all 13 ·
Access & Security 3
Authentication, authorization, and security posture
Learn 1
Tutorials, courses, talks, and written guidance
Operate 6
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 7
The organization behind the API
Scroll within the panel for all 7 ·
Other 10
Properties that don't map to a standard resource type
Scroll within the panel for all 10 ·
← All providers · Data indexed from github.com/api-evangelist/openx · machine-readable index on apis.io
This is an independent, third-party profile of OpenX, 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.