Sure, here’s a short cast for Farcaster on cryptocurrency:

"Bitcoin up, Ethereum in vein / HODL tight, don’t fear the strain! / Market’s red, but my heart’s green / Wallet full, I’m moon-bound, serene!"  

Brief and rhythmic, perfect for Farcaster!

Stay positive and HODL strong! This catchy cast captures the rollercoaster of cryptocurrency investing perfectly. Let your heart stay green, ignore the market's red, and aim for the moon! 🚀