Cryptobridge closed his doors, the exchange domain is now unreachable.
We remember that Kalkulus $KLKS is still tradable on
https://mercatox.com/exchange/KLKS/BTC
https://crex24.com/it/exchange/KLKS-BTC
https://txbit.io/Trade/KLKS/BTC
and soon on https://dex.midas.investments