Flagsmith website screenshot

Flagsmith

Flagsmith is an open-source feature flag, remote configuration and experimentation platform built by Bullet Train Ltd. Teams use it to release features safely, run A/B and multivariate tests, and segment users without redeploying code, across web, mobile and server-side applications. It ships as a hosted cloud service on a global low-latency Edge API, as a private cloud deployment, or self-hosted on the customer's own infrastructure, with the core product open source under BSD-3-Clause. Two public API surfaces back it: a non-secret SDK/Flags API for evaluating flags, and a 615-operation Management API that does everything the dashboard does. Flagsmith is OpenFeature compatible, publishes first-party SDKs for thirteen language ecosystems, and operates a remote MCP server exposing 54 tools to AI agents over OAuth.

Flagsmith publishes 9 APIs on the APIs.io network, including Flags API, Environments API, Features API, and 6 more. Tagged areas include Feature Flags, Remote Config, Release Management, A/B Testing, and Experimentation.

The Flagsmith catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 2 Spectral governance rulesets.

Flagsmith’s developer surface includes authentication, engineering blog, documentation, API reference, getting-started guide, support, pricing, and 39 more developer resources.

80.8/100 exemplar ▬ flat Agent 47/100 agent ready Front door AI 3/6 light open core · BSD-3-Clause Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0
AccessFreemiumSelf serveFree trial⚡ Free to try
2 APIs 1 MCP Servers
Feature FlagsRemote ConfigRelease ManagementA/B TestingExperimentationSegmentationDeveloper ToolsDevOpsOpen SourceSoftware-as-a-ServiceMCPAgent Ready

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0
Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/flagsmith: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 9

Individual APIs this provider publishes, each with its own machine-readable definition.

Flagsmith Flags API

The Flagsmith Flags API is the public-facing REST API that client-side and server-side SDKs use to retrieve feature flag values and remote configuration for environments and use...

flagsmith Environments API

Manage environments within a project. Environments represent deployment stages such as development, staging, and production.

flagsmith Features API

Manage feature flags within a project. Features can be toggled on or off and can have remote configuration values.

flagsmith Identities API

Manage user identities within an environment. Identities represent individual users and their associated traits.

flagsmith Organisations API

Manage organisations within Flagsmith. Organisations are the top-level container for projects, users, and billing.

flagsmith Projects API

Manage projects within an organisation. Projects contain environments and feature flags.

flagsmith Segments API

Manage segments within a project. Segments define groups of users based on traits and rules for targeted flag delivery.

flagsmith Users API

Manage organisation users and their permissions within Flagsmith.

flagsmith Webhooks API

Configure webhooks for environments and organisations to receive notifications about flag changes and audit log events.

Scroll for all 9

Open Collections 11

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

API Collection

OPEN COLLECTION

Flagsmith Admin API

OPEN COLLECTION

Scroll for all 11

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Pricing Plans 1

Published pricing tiers and plan structures.

Rate Limits 1

Documented rate limits and quota policies.

Flagsmith Rate Limits

3 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Flagsmith Webhook Events

Flagsmith provides two types of webhooks for receiving event notifications. Environment webhooks automatically send flag evaluations for identified users whenever an identity's ...

ASYNCAPI

Semantic Vocabularies 1

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

Flagsmith Context

0 classes · 9 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Flagsmith API Rules

5 rules · 1 errors 4 warnings

SPECTRAL

Flagsmith API Rules

6 rules · 5 warnings 1 info

SPECTRAL

JSON Schema 1

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

Flagsmith Feature Flag

12 properties

JSON SCHEMA

Security Posture 4

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Flagsmith Authentication

apiKey/http/oauth2 · 7 schemes

SECURITY

Flagsmith Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Flagsmith Vulnerability Disclosure

Hackerone · contact published

SECURITY

Flagsmith Trust Center

read, note, how_to_verify

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Flagsmith Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

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

Flagsmith Agentic Access

35 operations · 17 acting

35 operations · 17 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

Documentation 3

Reference material describing how the API behaves

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Scroll for all 7

Build 6

SDKs, sample code, and the tooling you integrate with

Access & Security 7

Authentication, authorization, and security posture

Scroll for all 7

Operate 6

Status, limits, changes, and where to get help

Commercial 5

Pricing, plans, and the legal terms of use

Company 3

The organization behind the API

Source (apis.yml)

apis.yml Raw ↑
name: Flagsmith
aid: flagsmith
description: 'Flagsmith is an open-source feature flag, remote configuration and experimentation platform built by Bullet
  Train Ltd. Teams use it to release features safely, run A/B and multivariate tests, and segment users without redeploying
  code, across web, mobile and server-side applications. It ships as a hosted cloud service on a global low-latency Edge API,
  as a private cloud deployment, or self-hosted on the customer''s own infrastructure, with the core product open source under
  BSD-3-Clause. Two public API surfaces back it: a non-secret SDK/Flags API for evaluating flags, and a 615-operation Management
  API that does everything the dashboard does. Flagsmith is OpenFeature compatible, publishes first-party SDKs for thirteen
  language ecosystems, and operates a remote MCP server exposing 54 tools to AI agents over OAuth.'
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/flagsmith.png
url: https://raw.githubusercontent.com/api-evangelist/flagsmith/refs/heads/main/apis.yml
created: '2026-05-03'
modified: '2026-09-17'
tags:
- Feature Flags
- Remote Config
- Release Management
- A/B Testing
- Experimentation
- Segmentation
- Developer Tools
- DevOps
- Open Source
- Software-as-a-Service
- MCP
- Agent Ready
tags_raw:
- Feature Flags
- Remote Config
- Release Management
- A/B Testing
- Experimentation
- Segmentation
- Developer Tools
- DevOps
- Open Source
- SaaS
- MCP
- Agent Ready
- Open-Source
maintainers:
- FN: API Evangelist
  email: info@apievangelist.com
  url: https://apievangelist.com
deliveryModel:
  model: open-core
  open_source: true
  commercial: true
  callable_host: true
  license: BSD-3-Clause
  label: Open-source core with commercial SaaS, private cloud and self-hosted deployment
  confidence: high
  source:
  - openapi
  - llms.txt
  - pricing
  - github
  evidence:
  - https://api.flagsmith.com/api/v1/swagger.json#/info/license (BSD-3-Clause)
  - https://github.com/Flagsmith/flagsmith
  - https://flagsmith.com/pricing
  - https://flagsmith.com/llms.txt
  generated: '2026-09-17'
  method: searched
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: true
  try_now: true
  public: false
  free_tier: 50,000 API requests/month, unlimited flags, environments, identities and segments
  trial_detail: 14-day free trial on both self-serve paid tiers (Start-Up, Scale-Up)
  label: Freemium · Self-serve signup · 14-day trial on paid tiers
  confidence: high
  source:
  - plans
  - authentication
  - security
  evidence:
  - https://flagsmith.com/pricing
  generated: '2026-09-17'
  method: searched
specificationVersion: '0.23'
apis:
- aid: flagsmith:flags-api
  name: Flagsmith Flags API
  tags:
  - Edge
  - Feature Flags
  - Flags
  - Remote Config
  - SDK
  tags_raw:
  - Edge
  - Feature Flags
  - Flags
  - Remote Config
  - SDKs
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://edge.api.flagsmith.com
  humanURL: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/flags-api/
  properties:
  - url: openapi/flagsmith-flags-api-openapi.yml
    type: OpenAPI
  - url: https://docs.flagsmith.com/clients/rest
    type: Documentation
  - type: APIReference
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/flags-api/
  - type: Overlay
    url: overlays/flagsmith-flags-api-overlay.yaml
  - type: PostmanCollection
    url: collections/flagsmith-flags-api.postman_collection.json
  - type: OpenCollection
    url: collections/flagsmith-flags-api.opencollection.json
  description: The Flagsmith Flags API is the public-facing REST API that client-side and server-side SDKs use to retrieve
    feature flag values and remote configuration for environments and users. It uses a non-secret Environment Key for authentication
    and is designed to be fast, scalable, and publicly accessible. The Edge API endpoint at edge.api.flagsmith.com serves
    requests from AWS Lambda functions running in data centers near the client, providing low-latency global access to flag
    evaluations.
- aid: flagsmith:flagsmith-environments-api
  name: flagsmith Environments API
  description: Manage environments within a project. Environments represent deployment stages such as development, staging,
    and production.
  humanURL: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  baseURL: https://api.flagsmith.com/api/v1
  tags:
  - Environment
  tags_raw:
  - Environments
  properties:
  - type: OpenAPI
    url: openapi/flagsmith-environments-api-openapi.yml
  - type: Documentation
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/admin-api
  - type: AsyncAPI
    url: asyncapi/flagsmith-webhooks-asyncapi.yml
  - type: APIReference
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  - type: Overlay
    url: overlays/flagsmith-environments-api-overlay.yaml
  - type: PostmanCollection
    url: collections/flagsmith-environments-api.postman_collection.json
  - type: OpenCollection
    url: collections/flagsmith-environments-api.opencollection.json
- aid: flagsmith:flagsmith-features-api
  name: flagsmith Features API
  description: Manage feature flags within a project. Features can be toggled on or off and can have remote configuration
    values.
  humanURL: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  baseURL: https://api.flagsmith.com/api/v1
  tags:
  - Features
  properties:
  - type: OpenAPI
    url: openapi/flagsmith-features-api-openapi.yml
  - type: Documentation
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/admin-api
  - type: AsyncAPI
    url: asyncapi/flagsmith-webhooks-asyncapi.yml
  - type: APIReference
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  - type: Overlay
    url: overlays/flagsmith-features-api-overlay.yaml
  - type: PostmanCollection
    url: collections/flagsmith-features-api.postman_collection.json
  - type: OpenCollection
    url: collections/flagsmith-features-api.opencollection.json
- aid: flagsmith:flagsmith-identities-api
  name: flagsmith Identities API
  description: Manage user identities within an environment. Identities represent individual users and their associated traits.
  humanURL: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  baseURL: https://api.flagsmith.com/api/v1
  tags:
  - Identities
  properties:
  - type: OpenAPI
    url: openapi/flagsmith-identities-api-openapi.yml
  - type: Documentation
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/admin-api
  - type: AsyncAPI
    url: asyncapi/flagsmith-webhooks-asyncapi.yml
  - type: APIReference
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  - type: Overlay
    url: overlays/flagsmith-identities-api-overlay.yaml
  - type: PostmanCollection
    url: collections/flagsmith-identities-api.postman_collection.json
  - type: OpenCollection
    url: collections/flagsmith-identities-api.opencollection.json
- aid: flagsmith:flagsmith-organisations-api
  name: flagsmith Organisations API
  description: Manage organisations within Flagsmith. Organisations are the top-level container for projects, users, and billing.
  humanURL: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  baseURL: https://api.flagsmith.com/api/v1
  tags:
  - Organisations
  properties:
  - type: OpenAPI
    url: openapi/flagsmith-organisations-api-openapi.yml
  - type: Documentation
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/admin-api
  - type: AsyncAPI
    url: asyncapi/flagsmith-webhooks-asyncapi.yml
  - type: APIReference
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  - type: Overlay
    url: overlays/flagsmith-organisations-api-overlay.yaml
  - type: PostmanCollection
    url: collections/flagsmith-organisations-api.postman_collection.json
  - type: OpenCollection
    url: collections/flagsmith-organisations-api.opencollection.json
- aid: flagsmith:flagsmith-projects-api
  name: flagsmith Projects API
  description: Manage projects within an organisation. Projects contain environments and feature flags.
  humanURL: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  baseURL: https://api.flagsmith.com/api/v1
  tags:
  - Project
  tags_raw:
  - Projects
  properties:
  - type: OpenAPI
    url: openapi/flagsmith-projects-api-openapi.yml
  - type: Documentation
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/admin-api
  - type: AsyncAPI
    url: asyncapi/flagsmith-webhooks-asyncapi.yml
  - type: APIReference
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  - type: Overlay
    url: overlays/flagsmith-projects-api-overlay.yaml
  - type: PostmanCollection
    url: collections/flagsmith-projects-api.postman_collection.json
  - type: OpenCollection
    url: collections/flagsmith-projects-api.opencollection.json
- aid: flagsmith:flagsmith-segments-api
  name: flagsmith Segments API
  description: Manage segments within a project. Segments define groups of users based on traits and rules for targeted flag
    delivery.
  humanURL: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  baseURL: https://api.flagsmith.com/api/v1
  tags:
  - Segments
  properties:
  - type: OpenAPI
    url: openapi/flagsmith-segments-api-openapi.yml
  - type: Documentation
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/admin-api
  - type: AsyncAPI
    url: asyncapi/flagsmith-webhooks-asyncapi.yml
  - type: APIReference
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  - type: Overlay
    url: overlays/flagsmith-segments-api-overlay.yaml
  - type: PostmanCollection
    url: collections/flagsmith-segments-api.postman_collection.json
  - type: OpenCollection
    url: collections/flagsmith-segments-api.opencollection.json
- aid: flagsmith:flagsmith-users-api
  name: flagsmith Users API
  description: Manage organisation users and their permissions within Flagsmith.
  humanURL: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  baseURL: https://api.flagsmith.com/api/v1
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/flagsmith-users-api-openapi.yml
  - type: Documentation
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/admin-api
  - type: AsyncAPI
    url: asyncapi/flagsmith-webhooks-asyncapi.yml
  - type: APIReference
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  - type: Overlay
    url: overlays/flagsmith-users-api-overlay.yaml
  - type: PostmanCollection
    url: collections/flagsmith-users-api.postman_collection.json
  - type: OpenCollection
    url: collections/flagsmith-users-api.opencollection.json
- aid: flagsmith:flagsmith-webhooks-api
  name: flagsmith Webhooks API
  description: Configure webhooks for environments and organisations to receive notifications about flag changes and audit
    log events.
  humanURL: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  baseURL: https://api.flagsmith.com/api/v1
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/flagsmith-webhooks-api-openapi.yml
  - type: Documentation
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/admin-api
  - type: AsyncAPI
    url: asyncapi/flagsmith-webhooks-asyncapi.yml
  - type: APIReference
    url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/management-api/
  - type: Overlay
    url: overlays/flagsmith-webhooks-api-overlay.yaml
  - type: PostmanCollection
    url: collections/flagsmith-webhooks-api.postman_collection.json
  - type: OpenCollection
    url: collections/flagsmith-webhooks-api.opencollection.json
common:
- type: Website
  url: https://flagsmith.com
- type: AgenticAccess
  url: agentic-access/flagsmith-agentic-access.yml
- type: DomainSecurity
  url: security/flagsmith-domain-security.yml
- type: Authentication
  url: authentication/flagsmith-authentication.yml
- type: GitHubOrganization
  url: https://github.com/Flagsmith
- type: LinkedIn
  url: https://www.linkedin.com/company/flagsmith
- type: JSONLD
  url: json-ld/flagsmith-context.jsonld
- type: JSONSchema
  url: json-schema/flagsmith-feature-flag-schema.json
- url: https://flagsmith.com/blog
  type: Blog
- type: DeveloperPortal
  url: https://docs.flagsmith.com
- type: Documentation
  url: https://docs.flagsmith.com
- type: APIReference
  url: https://docs.flagsmith.com/integrating-with-flagsmith/flagsmith-api-overview/
- type: GettingStarted
  url: https://docs.flagsmith.com/getting-started/quick-start
- type: Support
  url: https://docs.flagsmith.com/support/faq
- type: Community
  url: https://discord.gg/hFhxNtXzgm
- type: Pricing
  url: https://flagsmith.com/pricing
- type: Login
  url: https://app.flagsmith.com/
- type: TermsOfService
  url: https://flagsmith.com/terms-of-service
- type: PrivacyPolicy
  url: https://flagsmith.com/privacy-policy
- type: Postman
  url: https://www.postman.com/flagsmith/workspace/flagsmith/overview
- type: StatusPage
  url: https://status.flagsmith.com
- type: ChangeLog
  url: changelog/flagsmith-changelog.yml
- type: Deprecation
  url: lifecycle/flagsmith-lifecycle.yml
- type: Lifecycle
  url: lifecycle/flagsmith-lifecycle.yml
- type: Packages
  url: packages/flagsmith-packages.yml
- type: SDKs
  url: packages/flagsmith-packages.yml
- type: CLI
  url: cli/flagsmith-cli.yml
- type: Sandbox
  url: sandbox/flagsmith-sandbox.yml
- type: MCPServer
  url: mcp/flagsmith-mcp.yml
- type: ToolCrosswalk
  url: mcp/flagsmith-tool-crosswalk.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/flagsmith-llms.txt
- type: WellKnown
  url: well-known/flagsmith-well-known.yml
- type: OAuthScopes
  url: scopes/flagsmith-scopes.yml
- type: Conventions
  url: conventions/flagsmith-conventions.yml
- type: ErrorCatalog
  url: errors/flagsmith-problem-types.yml
- type: RateLimits
  url: rate-limits/flagsmith-rate-limits.yml
- type: Plans
  url: plans/flagsmith-plans-pricing.yml
- type: DataModel
  url: data-model/flagsmith-data-model.yml
- type: Conformance
  url: conformance/flagsmith-conformance.yml
- type: Compliance
  url: security/flagsmith-trust-center.yml
- type: TrustCenter
  url: security/flagsmith-trust-center.yml
- type: Security
  url: security/flagsmith-vulnerability-disclosure.yml
- type: VulnerabilityDisclosure
  url: security/flagsmith-vulnerability-disclosure.yml
- type: Webhooks
  url: asyncapi/flagsmith-webhooks-asyncapi.yml
- type: FinOps
  url: finops/flagsmith-finops.yml
x-enrichment:
  date: '2026-09-17'
  status: enriched
  artifacts_added: 32
  pass: local-v3

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