cobinhood has wrong lot size

https://github.com/ccxt/ccxt/blob/master/python/ccxt/cobinhood.py#L177

                'lot': float(market['quote_increment']),

The lot field of Cobinhood market structure was assigned as quote_increment field of http response. However, they have different semantic meaning. lot field is an amount w.r.t. base currency; while quote_increment field is an amount w.r.t. quote currency (https://cobinhood.github.io/api-public/).

For example, quote_increment of BTC/USDT market is 0.1, which means quote amount of all orders must be a multiple of 0.1USDT. lot of BTC/USDT being 0.1 is not correct.

Unfortunately, it seems Cobinhood does not provide a field in its API of the semantic meaning of lot. I guess its order matching algorithm is based on quote currency amount, which is very uncommon. I suggest leave lot field as undefined.

[dancju]

thank you very much! it is working now!

[mkutny]

• Looking at their trades it indeed looks like their price precision is 0.1 which is consistent with their quote_increment.
• I don’t see they provide amount precision too.
• A side note: lot is deprecated, these values should go into market.precision property.

If you have happened to have some funds on cobinhood could you try to create an order which violates their presumed amount precision? Something like:

ccxt> python examples/py/cli.py cobinhood createLimitBuyOrder BTC/USDT 0.000000001 5000

I wonder what it will say about it.

And don’t forget to cancel this order afterwards )