> ## Documentation Index
> Fetch the complete documentation index at: https://docs.b3os.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Get Market Open Interest

Get live open interest snapshot across all Hyperliquid coins from HyperTracker. Shows total OI, long/short split, position counts, and long-short ratio per coin. Ideal for: OI analysis, market sentiment, identifying crowded trades.

Catalog action Blockchain Data

Get live open interest snapshot across all Hyperliquid coins from HyperTracker. Shows total OI, long/short split, position counts, and long-short ratio per coin. Ideal for: OI analysis, market sentiment, identifying crowded trades.


## At a Glance

| Field | Value |
| --- | --- |
| Action ID | `hypertracker-get-market-open-interest` |
| Category | Blockchain Data |
| Connector | Not required |
| Requires gas | No |
| Funds movement | None declared |
| Tags | `hypertracker`, `hyperliquid`, `open-interest`, `market-data`, `read` |

## Payload Schema

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `apiKey` | `string` | No | HyperTracker API key \(falls back to HYPERTRACKER_API_KEY env var\) |
| `limit` | `number` | No | Number of coins to return. Default 20, max 100. |

## Result Schema

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `coins` | `array` | Yes | Open interest data per coin, ordered by total OI descending |

## Examples

**Workflow node**

```json
{
  "type": "hypertracker-get-market-open-interest",
  "payload": {
    "apiKey": "configured-in-b3os",
    "limit": 1
  },
  "children": []
}
```
  **Test with API**

```bash
curl -X POST "https://api.b3os.org/v1/actions/hypertracker-get-market-open-interest/test" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "inputs": {
    "apiKey": "configured-in-b3os",
    "limit": 1
  }
}'
```

**Use expressions for dynamic values**

Payload fields can use workflow expressions such as `{{$trigger.body.amount}}`, `{{$nodes.fetch.result.price}}`, and `{{$props.asset}}` when the value should come from a trigger, prior node, or reusable workflow prop.