# LeapC Tracking API

**Canonical:** https://apis.io/apis/leap-motion/leapc-tracking-api/  
**Provider:** Leap Motion — https://apis.io/providers/leap-motion/  
**Documentation:** https://docs.ultraleap.com/api-reference/tracking-api/index.html

LeapC Tracking API is one of 2 APIs that [Leap Motion](https://apis.io/providers/leap-motion/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Hand Tracking, Native API, and C. The published artifact set on APIs.io includes API documentation and an API reference.

LeapC is the native C API for Ultraleap / Leap Motion hand tracking. A client opens a LEAP_CONNECTION to the locally running Ultraleap Hand Tracking Service and drives a message pump with LeapPollConnection(), receiving tracking events (LEAP_TRACKING_EVENT with LEAP_HAND / LEAP_PALM / LEAP_DIGIT / LEAP_BONE), device events, image frames, policy and configuration responses. It is the layer the Unity, Unreal, OpenXR and Python bindings are built on. There is no hosted HTTP base URL — the transport is local IPC to the tracking service.

## Machine-readable artifacts (7)

- **Documentation** — https://docs.ultraleap.com/api-reference/tracking-api/leapc-guide.html
- **APIReference** — https://docs.ultraleap.com/api-reference/tracking-api/api-reference.html
- **Examples** — https://docs.ultraleap.com/api-reference/tracking-api/examples.html
- **ErrorCatalog** — https://raw.githubusercontent.com/api-evangelist/leap-motion/refs/heads/main/errors/leap-motion-error-codes.yml
- **DataModel** — https://raw.githubusercontent.com/api-evangelist/leap-motion/refs/heads/main/data-model/leap-motion-data-model.yml
- **Conventions** — https://raw.githubusercontent.com/api-evangelist/leap-motion/refs/heads/main/conventions/leap-motion-conventions.yml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/leap-motion/refs/heads/main/apis.yml

## Other Leap Motion APIs (1)

- [Ultraleap Tracking WebSocket](https://apis.io/apis/leap-motion/tracking-websocket/)

## Tags

Hand Tracking, Native API, C

---

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