> ## Documentation Index
> Fetch the complete documentation index at: https://docs.posetracker.com/llms.txt
> Use this file to discover all available pages before exploring further.

# API key & exercises

> Optional paid movement engine — reps, form score, jumps. Keypoints stay free without a key.

Keypoints work **without** an API key. Pass `apiToken` when you want the remote movement engine (exercises, counter, form score, jumps, plan-gated features).

<Tip>
  This page is optional. Most integrators start with [Quickstart](/quickstart) keypoints only.
</Tip>

## Provider with token

```tsx theme={null}
import {
  PoseTrackerProvider,
  WebViewPoseView,
  usePoseTracker,
} from '@pose-tracker/react-native-pose-estimation';

function App() {
  return (
    <PoseTrackerProvider
      apiToken="YOUR_API_KEY"
      options={{ features: { angles: true, progression: true, minGrade: 'B' } }}
    >
      <CameraScreen />
    </PoseTrackerProvider>
  );
}

function CameraScreen() {
  const { preload, startExercise } = usePoseTracker({
    onCounter: (e) => {
      console.log(e.count, e.formScore?.grade);
    },
  });

  // Lobby: model warm-up only (no camera permission)
  // await preload();
  // Camera screen: start an exercise when ready
  // startExercise('squat');

  return (
    <WebViewPoseView
      style={{ flex: 1 }}
      drawSkeleton
      skeletonUuid="OPTIONAL_CUSTOM_SKELETON_UUID"
    />
  );
}
```

Same pattern works with `@pose-tracker/react-native-pose-estimation-light`.

## Conceptual web parity

```
https://app.posetracker.com/pose_tracker/tracking?token=YOUR_API_KEY&exercise=squat&skeleton=true
```

## Modes

| Mode             | When                                | Events                         |
| ---------------- | ----------------------------------- | ------------------------------ |
| `keypoints-only` | No valid API key / session          | Keypoints                      |
| `full-engine`    | Handshake succeeded + engine loaded | Counter, form score, angles, … |

## Watermark

Shown for keyless and free plans. Hidden for paid plans (`developer`, `company`, `enterprise`, …). Override with `showWatermark` on `WebViewPoseView` if needed.

## Reference

* [Exercises](/reference/exercises) — FSM catalog, aliases, jumps, `StartExerciseOptions`
* [Features & plans](/reference/features-plans) — gating matrix, `minGrade`, watermark
* [Events](/reference/events) — `onCounter`, posture, jump\_\* shapes
* [Provider & client](/reference/provider-client) — `configure`, `startExercise`, options

## Get a key

Product site: [posetracker.com](https://www.posetracker.com)