{
"channel": "l4Book",
"data": {
"snapshot": {
"coin": "BTC",
"levels": []
}
}
}Live Data WebSocket API
l4Book
L4 raw order book — snapshot then updates for one coin
Subscribe with
{"method":"subscribe","subscription":{"type":"l4Book","coin":"BTC"}}. Initial payload matches L4BookSnapshot; updates use L4BookUpdate.