Need help with your APIs? I offer API discovery, governance & evangelism services. Explore services →
API Evangelist API Evangelist
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC
Split website screenshot

Split

Split, now part of Harness Feature Management and Experimentation, is a feature flag and experimentation platform that enables teams to safely release features with controlled rollouts and measure their impact. Their developer platform provides REST APIs for managing feature flags, environments, segments, and workspaces, along with SDKs for evaluating feature flags across multiple languages and platforms.

agent ready

Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.

Kin Score

API Evangelist profiles Split the way a machine reads it — 101 machine-readable artifacts across 21 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 — Split scores 61.6/100 (strong), with a separate agent-readiness read of 48/100 (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.

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 61.6/100 · strong
Contract Quality 16.8 / 25
Developer Ergonomics 6.1 / 20
Commercial Clarity 14.7 / 20
Operational Transparency 4.8 / 13
Governance 10.4 / 12
Discoverability 8.8 / 10
Agent readiness — 48/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3

How we profile Split

Each block below is one kind of artifact we hold for Split. 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 21

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.

Split Admin API

The Split Admin API is a REST API that enables programmatic management of workspaces (projects), environments, traffic types, attributes, users, groups, API keys, and change req...

Split JavaScript SDK

The Split JavaScript SDK provides client-side integration for feature flag evaluation in browser-based applications. It handles real-time feature flag synchronization, treatment...

Split Node.js SDK

The Split Node.js SDK enables server-side feature flag evaluation for Node.js applications with local evaluation, automatic synchronization, event tracking, and impression logging.

Split Java SDK

The Split Java SDK provides server-side feature flag evaluation for Java and JVM-based applications with local treatment evaluation and streaming updates.

Split Python SDK

The Split Python SDK enables server-side feature flag evaluation for Python applications, suitable for Django, Flask, and other frameworks.

Split React SDK

The Split React SDK provides React-specific components and hooks for integrating feature flags including a SplitProvider context, useTreatments hooks, and conditional rendering ...

Split API Keys API

Create and delete API keys for authenticating with the Split platform, with configurable roles and scopes.

Split Attributes API

Manage attributes used in targeting rules for feature flag definitions.

Split Change Requests API

Manage change requests for controlled approval workflows when modifying feature flag definitions.

Split Environments API

Manage environments within workspaces for deploying and testing feature flags across stages such as staging and production.

Split Evaluation API

Endpoints for evaluating feature flags and retrieving treatment values for given keys and feature flag names.

Split Events API

Endpoints for tracking custom events used in experimentation and metrics measurement.

Split Feature Flag Definitions API

Manage feature flag definitions in specific environments, including targeting rules, treatments, percentage rollouts, and default treatments.

Split Feature Flags API

Create, retrieve, update, and delete feature flags (splits) within workspaces. Feature flags represent the toggles used to control feature rollouts.

Split Groups API

Manage groups for organizing users and assigning permissions.

Split Identities API

Manage identities (keys) within segments.

Split Large Segments API

Manage large segments optimized for high-volume identity lists.

Split Segments API

Manage segments which define reusable groups of identities for targeting.

Split Traffic Types API

Manage traffic types which define the entities (users, accounts, etc.) that feature flags target.

Split Users API

Manage users within the Split account, including inviting new users and updating user roles.

Split Workspaces API

Manage workspaces (projects) which organize feature flags and experiments across business units, product lines, and applications.

Scroll within the panel for all 21 ·

Open Collections 3

Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Split Admin API

OPEN COLLECTION

Split Evaluator API

OPEN COLLECTION

Split Feature Flag API

OPEN COLLECTION

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.

Split Plans Pricing

3 plans

PLANS

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.

Split Rate Limits

3 limits

RATE LIMITS

FinOps 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.

Split Finops

FINOPS

Features 16

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.

Individual free for solo devs, up to 10 MAU
Team: per-MAU pricing (custom)
Enterprise: Statistical Engine, Causal Impact, SCIM/SSO
Now Harness Feature Management & Experimentation (FME)
Server-side and client-side SDKs
Targeting rules with attributes
Experimentation with frequentist and Bayesian inference
Admin API: 80 req/min/org
Datafile-based SDK distribution (CDN-backed)
Events API: 100 events per request
OAuth 2.0 + API keys
Webhooks for split changes and rollouts
Audit logs (Enterprise)
Streaming changes (server-sent events)
Causal Impact analysis for treatment effect
Integration with Datadog, NewRelic, Segment for guardrails

Scroll within the panel for all 16 ·

Semantic Vocabularies 1

JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.

JSON-LD contexts and semantic vocabularies used across these APIs.

Split Context

0 classes · 11 properties

JSON-LD

Spectral Rules 2

Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.

Split API Rules

6 rules · 4 warnings

SPECTRAL

Split API Rules

11 rules · 4 errors · 5 warnings

SPECTRAL

JSON Schema 46

Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.

Standalone JSON Schema definitions for this provider's data models.

AllTreatmentsResult

0 properties

JSON SCHEMA

ApiKey

6 properties

JSON SCHEMA

ApiKeyCreate

5 properties

JSON SCHEMA

Attribute

6 properties

JSON SCHEMA

Bucket

2 properties

JSON SCHEMA

ChangeRequest

9 properties

JSON SCHEMA

ChangeRequestList

4 properties

JSON SCHEMA

Condition

2 properties

JSON SCHEMA

Environment

3 properties

JSON SCHEMA

EnvironmentCreate

2 properties

JSON SCHEMA

EnvironmentRef

2 properties

JSON SCHEMA

EnvironmentUpdate

2 properties

JSON SCHEMA

EvaluationAttributes

2 properties

JSON SCHEMA

EventProperties

1 properties

JSON SCHEMA

Split Feature Flag Definition

12 properties

JSON SCHEMA

Split Feature Flag

5 properties

JSON SCHEMA

FeatureFlag

5 properties

JSON SCHEMA

FeatureFlagCreate

3 properties

JSON SCHEMA

FeatureFlagDefinition

12 properties

JSON SCHEMA

FeatureFlagDefinitionCreate

6 properties

JSON SCHEMA

FeatureFlagDefinitionList

4 properties

JSON SCHEMA

FeatureFlagDefinitionUpdate

7 properties

JSON SCHEMA

FeatureFlagList

4 properties

JSON SCHEMA

FeatureFlagUpdate

2 properties

JSON SCHEMA

Group

4 properties

JSON SCHEMA

GroupCreate

2 properties

JSON SCHEMA

GroupRef

2 properties

JSON SCHEMA

HealthCheckResponse

2 properties

JSON SCHEMA

LargeSegmentList

4 properties

JSON SCHEMA

Matcher

8 properties

JSON SCHEMA

Split Segment

6 properties

JSON SCHEMA

SegmentKeysList

4 properties

JSON SCHEMA

SegmentKeysUpdate

2 properties

JSON SCHEMA

SegmentList

4 properties

JSON SCHEMA

Tag

1 properties

JSON SCHEMA

TargetingRule

2 properties

JSON SCHEMA

TrafficType

2 properties

JSON SCHEMA

Treatment

3 properties

JSON SCHEMA

TreatmentResult

3 properties

JSON SCHEMA

TreatmentsResult

0 properties

JSON SCHEMA

User

6 properties

JSON SCHEMA

UserInvite

2 properties

JSON SCHEMA

UserList

4 properties

JSON SCHEMA

UserUpdate

3 properties

JSON SCHEMA

Workspace

3 properties

JSON SCHEMA

WorkspaceList

4 properties

JSON SCHEMA

Scroll within the panel for all 46 ·

JSON Structure 3

JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.

JSON Structure definitions describing this provider's data shapes.

Split Feature Flag Definition Structure

0 properties

JSON STRUCTURE

Split Feature Flag Structure

0 properties

JSON STRUCTURE

Split Structure

0 properties

JSON STRUCTURE

Examples 3

Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.

Example request and response payloads for these APIs.

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.

Split Authentication

http · 1 scheme

SECURITY

Split Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.

Recommended x-agentic-access execution contracts for AI agents.

Split Agentic Access

53 operations · 28 acting · 1 human-in-the-loop

53 operations · 28 acting

AGENTIC

Resources

Every other property we hold for Split — 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 2

Portal, sign-up, and the first successful call

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

Build 1

SDKs, sample code, and the tooling you integrate with

Access & Security 2

Authentication, authorization, and security posture

Commercial 2

Pricing, plans, and the legal terms of use

Company 3

The organization behind the API

Other 1

Properties that don't map to a standard resource type

← All providers · Data indexed from github.com/api-evangelist/split · machine-readable index on apis.io