> From TickerLayer docs, Perpetuals: https://tickerlayer.com/docs/products/perpetuals#perpetuals-symbols
> REST base URL https://api.tickerlayer.com, API key in the `x-api-key` header. WebSocket wss://stream.tickerlayer.com?apiKey=YOUR_API_KEY. Full API reference: https://tickerlayer.com/llms-full.txt

## Symbol list

**Endpoint:** `GET /perpetuals/symbols`

Every perpetual contract with its name, underlying class and source count. Open to any valid key, with or without Perpetuals on the account.

### Query parameters

| Parameter | Type | Description |
| --- | --- | --- |
| `underlying` | string | Optional filter: equity, etf, commodity, index, forex, pre_ipo or crypto. An unknown value is ignored. |

### Request

```bash
curl -sS "https://api.tickerlayer.com/perpetuals/symbols?underlying=commodity" \
  -H "x-api-key: <YOUR_API_KEY>"
```

```python
import requests

res = requests.get(
    "https://api.tickerlayer.com/perpetuals/symbols?underlying=commodity",
    headers={"x-api-key": "<YOUR_API_KEY>"},
)
print(res.json())
```

```javascript
const res = await fetch("https://api.tickerlayer.com/perpetuals/symbols?underlying=commodity", {
  headers: { "x-api-key": "<YOUR_API_KEY>" },
});
const data = await res.json();
console.log(data);
```

```go
req, _ := http.NewRequest("GET", "https://api.tickerlayer.com/perpetuals/symbols?underlying=commodity", nil)
req.Header.Set("x-api-key", "<YOUR_API_KEY>")
```

### Response

```json
{
  "symbols": [
    {
      "symbol": "XAUUSDT",
      "name": "Gold",
      "instrument_type": "perpetual",
      "underlying_asset_class": "commodity",
      "base": "XAU",
      "source_count": 6
    }
  ],
  "count": 8
}
```

### Notes

`source_count` here is how many sources list the contract. On a price it is how many of them are live behind that value right now.