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

# Tickers

> Live index, mark, last and mid prices, open interest, and funding for every instrument.

All instruments at once:

```bash theme={null}
curl "https://api.polynode.dev/v3/perps/tickers?key=$POLYNODE_API_KEY"
```

One instrument — by id, symbol, or bare asset:

```bash theme={null}
curl "https://api.polynode.dev/v3/perps/tickers/btc?key=$POLYNODE_API_KEY"
```

```json theme={null}
{
  "instrument_id": 6,
  "symbol": "BTC-USD",
  "index_price": "62022",
  "mark_price": "62010",
  "last_price": "61989",
  "mid_price": "62010",
  "open_interest": "67.44542",
  "funding_rate": "0.0000125",
  "next_funding": 1783573200000,
  "timestamp": 1783571023159
}
```

| Field           | Meaning                                           |
| --------------- | ------------------------------------------------- |
| `index_price`   | External reference price of the underlying        |
| `mark_price`    | Exchange mark used for margining and liquidations |
| `last_price`    | Price of the most recent trade                    |
| `mid_price`     | Orderbook midpoint                                |
| `open_interest` | Open contracts (base-asset units)                 |
| `funding_rate`  | Current hourly funding rate                       |
| `next_funding`  | When the next funding payment occurs (ms)         |

Tickers update continuously; for sub-second consumption use the [`perps_tickers` WebSocket channel](/perps/websocket/channels).