Suggested/correct way of calculating stepSize for size truncating when stepSize is 1?

[ghost]

XRP-USDT pair on Binance' LOT_SIZE from https://api.binance.com/api/v1/exchangeInfo:

{
    "filterType": "LOT_SIZE",
    "minQty": "1.00000000",
    "maxQty": "9222449.00000000",
    "stepSize": "1.00000000"
},

Calculating amount of decimals like this:

filter = state.interface.get_order_filter(symbol)
increment = filter["market_order"]["base_increment"]
decimals = abs(Decimal(str(increment)).as_tuple().exponent() # I forget from where; but this is taken from the Blankly source

Decimals is 1 but should be 0 (?)

size = state.interface.cash / price
size = blankly.trunc(size, decimals)

When creating a market buy order Binance returns LOT_SIZE error.

My current solution is wrapping the market buy order in two try/except statements like this:

try:
    state.interface.market_order(symbol, "buy", size)
except:
    try:
        state.interface.market_order(symbol, "buy", blankly.trunc(size, decimals - 1))
    except Exception as e:
        print(e)

Is there a more proper/elegant way of doing this?

[EmersonDove]

Hmm - I think you're right there should be a significantly easier way to access the decimal count especially for people checking the order filter. I'm also looking into the base decimal differences between our response what's shown at exchangeInfo. We've never had an issue with our filters being inaccurate but maybe these lower price symbols have a more complex order filter to deal with.

We're querying the v3 API, but it doesn't make much difference:
https://api.binance.com/api/v3/exchangeInfo