Vitalik Buterin, the co-founder of Ethereum (CRYPTO: ETH), sold memecoins he got for free on Sunday, sparking a bit of intrigue in the cryptocurrency community. The influential cryptocurrency entrepreneur swapped 150 billion I love puppies (PUPPIES) for 28.65 ETH, worth $117,635, and 1 billion ERC20 tokens for $13,900 in USDC (CRYPTO: USDC) stablecoin, according to Lookonchain.