I want to swap some BTC to altcoins without doing KYC: did you try Bisq or Atomex?
If I don't miss something, swap can charge you higher fee or the spread of price for swap is bigger than trading. If you are not mind of personal secret, would I ask you why do you want to swap?
If you use Binance, you can buy altcoins directly with bitcoin you have as taker or maker. I am sure you will get better price and have more number of altcoin with same amount of BTC than swap
On Binance, it is Convert, not swap:
https://www.binance.com/en/convert6. Are there any trading fees?
We do not charge any fees on OTC trades. However, there will be a spread (if you are buying, our prices will be above the market price. If you are selling, our price will be below the market price).