market:futures:open

Once you're connected to this subscription: wss://ws.amberdata.com/futures, every subscription message must include an explicit instrument. This is mandatory across all market types.

You must always specify the instrument.
For Futures and Options, you must also include the exchange field.

See here for more details and examples.

Request

{
  "jsonrpc" : "2.0",
  "id"      : 1,
  "method"  : "subscribe",
  "params"  : [ "market:futures:open_interests", { "instrument": "XRPUSDT", "exchange": "binance" } ]
}

Param	Type	Description
instrument	`string`	The asset instrument.
exchange	`string`	The exchange for which to retrieve asset instruments.

Response

{
    "jsonrpc": "2.0",
    "method": "subscription",
    "params": {
        "subscription": "e91d68fa-84c8-445b-8da4-62c9e6036b56",
        "result": {
            "exchange": "binance",
            "instrument": "BTCUSDT",
            "timestamp": 1711582494214,
            "value": "82862.305",
            "type": null
        }
    }
}

Field	Type	Description
exchange	`string`	The exchange name.
instrument	`string`	The instrument name.
timestamp	`number`	The time at which the data was received.
value	`string`	The total open interest for the specified instrument.
type	`string`	The type of futures contract.

Example

const WebSocket = require('ws');
const ws = new WebSocket('wss://ws.amberdata.com/futures', {headers: {x-api-key:'<api_key>'}});

ws.on('open', () => {
  ws.send(JSON.stringify({
      jsonrpc: '2.0',
      method: 'subscribe',
      params: ['market:futures:open_interests', {'instrument': 'XRPUSDT', 'exchange': 'binance'}],
      id: 1,
    }));
});

ws.on('message', data => {
  console.log(JSON.stringify(JSON.parse(data), null, 2));
});