# Positions · API reference · Femtos

> Open positions of one perp with leverage and liquidation price. GET /v1/positions on HyperCore: parameters, response fields and a live call per layer.

- Base URL: `https://api.femtos.xyz/v1` (REST) · `wss://api.femtos.xyz/v1/ws` (WebSocket) · MCP: `https://api.femtos.xyz/mcp`
- Auth: `Authorization: Bearer $FEMTOS_KEY`. Free key: https://femtos.xyz/account/new (browser), or with
  no browser: `GET https://femtos.xyz/accounts/agent/challenge`, solve its proof of work, then `POST https://femtos.xyz/accounts/agent/signup`
  (https://femtos.xyz/agents.md#agent-onboarding)
- Decimals are exact strings, times Unix milliseconds, addresses lowercase `0x`
- Whole API in one file: https://femtos.xyz/agents.md · OpenAPI: https://api.femtos.xyz/v1/openapi.json · Index: https://femtos.xyz/llms.txt
- Page with live calls: https://femtos.xyz/reference/positions

## Positions — GET `/v1/positions`

Open positions of one perp with leverage and liquidation price.

Layers: HyperCore. Not on Elysium or HyperEVM: served on HyperCore only.
Page with live calls: https://femtos.xyz/reference/positions?layer=hypercore

| Param | In | Example or values | Meaning |
|---|---|---|---|
| `coin` | query | `BTC` | Perp coin |
| `side` | query | `(empty)`, `long`, `short` | One side |
| `sort` | query | `notional`, `upnl`, `liqDistance` | Sort |
| `limit` | query | `50` | Rows |

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/positions?coin=BTC&sort=notional&limit=50"
```

| Field | Type | Meaning |
|---|---|---|
| `positions[]` | object | Sorted as asked: {address, szi, side, entryPx, notional, upnl, leverage, marginMode, liqPx, liqDistancePct, label, entity} |
| `markPx` | decimal \| null | Mark used |
| `asOf` | ms | Time of `height` (Unix ms) |
| `height` | int | Block the positions are at: the node's latest state (one every 10,000 blocks, ~12 min) rolled forward with every fill, funding payment and ledger update since, a few seconds behind the chain; the state itself while the roll is not running |
| `baseHeight` | int | Block of that node state (= height when not rolled forward) |
| `sort` | string | Sort applied (liqDistance or upnl without what they need: notional) |
| `order` | string | Order applied |

## Related (Liquidations & positions)

- [Liquidations](https://femtos.xyz/reference/liquidations.md) `GET /v1/liquidations`: Perp liquidations, newest first, one row per account, coin and block. (HyperCore)
- [Liquidations stream](https://femtos.xyz/reference/ws/liquidations.md) `WS hc.liquidations`: Each liquidation fill, the block it happens. (HyperCore)
- [Liquidation stats](https://femtos.xyz/reference/liquidation-stats.md) `GET /v1/liquidations/stats`: Totals, per coin, per time bucket and the largest, over a window. (HyperCore)
- [Position changes](https://femtos.xyz/reference/ws/positions.md) `WS hc.positions`: Each perp position change, one per block, account and coin. (HyperCore)
- [Open interest](https://femtos.xyz/reference/positions-overview.md) `GET /v1/positions/overview`: Open interest, accounts and unrealized PnL per perp. (HyperCore)
- [Liquidation map](https://femtos.xyz/reference/liqmap.md) `GET /v1/positions/liqmap`: Notional that would be liquidated at each price around the mark. (HyperCore)

Every page: https://femtos.xyz/reference.md