It is hard to tell what is going on.

However, when you take a look at the exchanges you can see that binance had lost nearly 50% of waves tokens in the last 30 days.

Most tokens, that were removed from exchanges, were afterward locked in the USD-N smart contract, which mainly lead to the increase in Waves price.

Vires normally has rates around 20% for stable coins. I'am providing stable coins at vires from the beginning and never had any issues.