API Harmony
API Harmony was an API discovery and recommendation tool from IBM Research that used graph-based search, machine learning, and cognitive technologies to help developers find, compare, and select compatible APIs. It was offered as a cloud service on IBM Bluemix and has since been discontinued.
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 API Harmony the way a machine reads it — 16 machine-readable artifacts across 1 API, 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 — API Harmony scores 11.9/100 (minimal), 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.
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 2026-08-17 · rubric v0.11.0
Put this on your own site. The badge is drawn live from API Harmony'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/api-harmony/"
title="API Harmony on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/api-harmony.svg"
alt="API Harmony Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/api-harmony/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/api-harmony/"
title="API Harmony on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/api-harmony/card.svg"
alt="API Harmony 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 API Harmony
Each block below is one kind of artifact we hold for API Harmony. 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 1
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.
API Harmony Service
API Harmony was an intelligent API matchmaking service that used graph technology and machine learning to search public APIs, reveal relationships between them, make recommendat...
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 six things the Kin Score reads for commercial clarity.
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.
Api Harmony Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Api Harmony Finops
FINOPSFeatures 6
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
API Graph Search
Graph-based search across public APIs to reveal relationships and connections between services.
API Recommendation
Machine learning-powered recommendations for compatible APIs based on developer intent and context.
API Composition Support
Tooling to help developers compose multiple APIs into unified applications.
API Discovery
Unified catalog and discovery interface for cloud-hosted and public APIs.
API Publishing
Tools for API providers to publish and promote their APIs to the ecosystem.
Gap Identification
Identifies gaps in the API ecosystem where no existing API satisfies a developer need.
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.
Use Cases 4
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
Cloud API Discovery
Help developers find the right APIs for cloud-based application development on IBM Bluemix.
API Compatibility Analysis
Identify which APIs can be combined for a given use case without conflicts or duplication.
API Portfolio Management
API providers could publish and promote their services to the broader developer ecosystem.
Microservices Integration
Support microservices architectures by identifying optimal third-party API combinations.
Resources
Every other property we hold for API Harmony — 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.
Documentation 1
Reference material describing how the API behaves
Access & Security 2
Authentication, authorization, and security posture
Company 1
The organization behind the API
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/api-harmony · machine-readable index on apis.io
This is an independent, third-party profile of API Harmony, 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.