Spot Trading pairs is not symmetry

Hi,

From binance python connector, I found that You can sell ARDR coin for BTC, but you cannot sell BTC for ARDR coin. I wonder why this kind of situation can happen. Should the trading pair be symmetric? I wonder why it is the case?

The trading pair works in both directions based on the side of the trade:

  • you sell ARDRBTC to sell ARDR and receive BTC
  • you buy ADRDBTC to buy ADRD and pay in BTC