KuCoin create order by quote amount not working?

When I try to create a new market buy/sell order on KuCoin by providing the quote amount using the quoteAmount parameter, like this:

kucoin.createOrder(symbol, 'market', 'buy', (void 0), (void 0), {
    'quoteAmount': value
});

I receive the following error [here]: TypeError: Cannot read property 'toString' of undefined.

I saw that this has been implemented more than a year ago in #6035, but I think there is a problem with that:

if (this.safeValue (params, 'quoteAmount')) {
    // used to create market order by quote amount - https://github.com/ccxt/ccxt/issues/4876
    request['funds'] = this.amountToPrecision (symbol, amount);  //<- ERROR! 'amount' used here accidentally instead of value of 'quoteAmount'?
} else {
    request['size'] = this.amountToPrecision (symbol, amount);
}

---

• Programming Language version: Node.Js v14.15.5
• CCXT version: v1.43.71
• CCXT Pro version: v0.6.9

[kroitor]

@frzsombor

so I don’t understand the problem. Is KuCoin giving bad market data or costToPrecision is used accidentally

The problem is that by logical reasoning funds should accept quote cost precision, but KuCoin API still accepts base precision only. I’ve pushed another fixup, please let me know if you still have this issue with 1.43.80, it will be available in ~20 minutes.

[frzsombor]

Unfortunately still not working, getting the same “Error: Balance insufficient!” error.

Now, it looks like the new costToPrecision leaves the request['funds'] at 8 number length precision (0.00061202), but KuCoin only accepts 5(-6?) as I found above.

And this is actually strange, because when I’ve checked this.markets[symbol].precision it showed precision: {amount: 4, price: 8}, for the symbol, so I don’t understand the problem. Is KuCoin giving bad market data (and this is why amountToPrecision was used until v1.43.76) or costToPrecision is used accidentally instead of amountToPrecision/priceToPrecision?