What is Polkadot Kraken?

Excuse me, could you please clarify what exactly is meant by "Polkadot Kraken"? As I understand, Polkadot is a decentralized network protocol that enables the cross-chain transfer of data and assets between blockchains, while Kraken, or perhaps you mean Kraken, is a popular cryptocurrency exchange platform. However, I'm not familiar with a direct combination or integration between the two. Could you be referring to a specific service, feature, or partnership between Polkadot and Kraken? If so, could you elaborate further on what this entails and its significance in the cryptocurrency and blockchain space?