// request
{
   "event":"subscribe",
   "channel":"book",
   "pair":"<PAIR>",
   "prec":"<PRECISION>",
   "freq":"<FREQUENCY>",
   "length":"<LENGTH>"
}

// response
{
   "event":"subscribed",
   "channel":"book",
   "chanId":"<CHANNEL_ID>",
   "pair":"<PAIR>",
   "prec":"<PRECISION>",
   "freq":"<FREQUENCY>",
   "len":"<LENGTH>"
}

// snapshot
[
   "<CHANNEL_ID>",
   [
      [
         "<PRICE>",
         "<COUNT>",
         "<AMOUNT>"
      ],
     ...
   ]
]

// updates
[
   "<CHANNEL_ID>",
   "<PRICE>",
   "<COUNT>",
   "<AMOUNT>"
]

Fields

Fields	Type	Description
PRECISION	string	Level of price aggregation (P0, P1, P2, P3). The default is P0.
FREQUENCY	string	Frequency of updates (F0, F1). F0=realtime / F1=2sec. The default is F0.
PRICE	float	Price level.
COUNT	int	Number of orders at that price level.
±AMOUNT	float	Total amount available at that price level. Positive values mean bid, negative values mean ask.
LENGTH	string	Number of price points ("25", "100") [default="25"]

Precision Levels per Pair

Pair	Precision Level	Number of significant figures	Example
BTCUSD	P0	2	$0.01
...	P1	1	$0.10
...	P2	0	$1
...	P3	-1	$10
LTCUSD	P0	4	$0.0001
...	P1	3	$0.001
...	P2	2	$0.01
...	P3	1	$0.1
LTCBTC	P0	6	฿0.000001
...	P1	5	฿0.00001
...	P2	4	฿0.0001
...	P3	3	฿0.001
ETHUSD	P0	4	$0.0001
...	P1	3	$0.001
...	P2	2	$0.01
...	P3	1	$0.1
ETHBTC	P0	6	฿0.000001
...	P1	5	฿0.00001
...	P2	4	฿0.0001
...	P3	3	฿0.001

🚧
Error Codes
10011 : Unknown Book precision
10012 : Unknown Book length

📘
NOTE
COUNT=0 means that you have to remove the price level from your book.