# Featureflip Client SDK API

**Canonical:** https://apis.io/apis/featureflip/featureflip-client-sdk-api/  
**Provider:** Featureflip — https://apis.io/providers/featureflip/  
**Base URL:** https://api.featureflip.io  
**Documentation:** https://featureflip.io/docs/management-api/overview/

Featureflip Client SDK API is one of 10 APIs that [Featureflip](https://apis.io/providers/featureflip/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Client SDK. The published artifact set on APIs.io includes an OpenAPI specification, an API reference, and API documentation.

Client SDK endpoints for browser-side feature flag evaluation. All endpoints require a valid Client SDK key passed via the Authorization header. Unlike server SDK endpoints, these evaluate flags server-side and return only values.

## Operations (3)

| Method | Path | Summary |
|---|---|---|
| POST | `/v1/client/evaluate` | Evaluates all client-visible feature flags for the given user context |
| POST | `/v1/client/identify` | Re-identifies the user with a new context, for example after login |
| GET | `/v1/client/stream` | Opens a Server-Sent Events stream for real-time client flag updates |

## Machine-readable artifacts (7)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/featureflip/refs/heads/main/openapi/featureflip-client-sdk-api-openapi.yml
- **APIReference** — https://featureflip.io/docs/management-api/reference/
- **Documentation** — https://featureflip.io/docs/management-api/reference/
- **Documentation** — https://featureflip.io/docs/management-api/authentication/
- **LLMsTxt** — https://featureflip.io/llms.txt
- **APIReference** — https://featureflip.io/docs/api/reference/
- **Documentation** — https://featureflip.io/docs/api/reference/

## Other Featureflip APIs (9)

- [MCP Server (local)](https://apis.io/apis/featureflip/mcp-server-local/)
- [Featureflip Environments API](https://apis.io/apis/featureflip/featureflip-environments-api/)
- [Featureflip Feature Flags API](https://apis.io/apis/featureflip/featureflip-feature-flags-api/)
- [Featureflip Me API](https://apis.io/apis/featureflip/featureflip-me-api/)
- [Featureflip Organizations API](https://apis.io/apis/featureflip/featureflip-organizations-api/)
- [Featureflip Projects API](https://apis.io/apis/featureflip/featureflip-projects-api/)
- [Featureflip SDK Keys API](https://apis.io/apis/featureflip/featureflip-sdk-keys-api/)
- [Featureflip Server SDK API](https://apis.io/apis/featureflip/featureflip-server-sdk-api/)
- [Featureflip User Segments API](https://apis.io/apis/featureflip/featureflip-user-segments-api/)

## Tags

Client SDK

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/featureflip/featureflip-client-sdk-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/featureflip/.