Open the websocket
| Key | trading trading::read |
| Throttle | stream |
| Cost | weight /pair |
| Answers | 101 401 403 423 429 451 |
| Idempotent | true |
Sign the upgrade request like any route. The subjects are market:<id>, event:<id>, and PRIVATE. The channels are lifecycle, trades, book, orders, and positions. Once per interval, a heartbeat message states your last seq on each subscribed private channel.
GET

