Kraken Wallet allows you to view and export the Extended Public Key (xPub) for your Bitcoin wallet.
What is a Bitcoin xPub?
Your Bitcoin xPub is the master public key that was used to generate all of the public bitcoin addresses for your wallet.
Note: Technically speaking, the Bitcoin extended public key for your Kraken Wallet is called a "zPub" which is an enhanced form of xPubs. The key difference is that zPubs instruct a wallet to derive native SegWit addresses, which Kraken Wallet supports.
Important:
Exercise caution when handling your Bitcoin xPub, and do not share it with any person or service that you don't trust or else your privacy may be compromised.
Anyone who has access to your xPub can derive all of your public keys, which means they can view all past and future transactions.