Crypto exchange Kraken, part of Payward Inc., is in talks to acquire a 15% stake in decentralized finance (DeFi) protocol Aave at a $385 million valuation, according to three people with knowledge of the matter. A potential deal would see Kraken investing 35,000 ether (ETH) in return for 250,000 AAVE tokens and a 15% common equity stake in Aave Group, according to a document seen by CoinDesk.