iirc Warpcast (the biggest Farcaster client) tried to do something like this and its terrible. You can buy “warps” (onchain points usable only inside the app I think) by clicking on a button that sends you an email with this message:

Warpcast uses Coinbase Commerce to handle payments. Payments are made onchain using Coinbase and may have additional fees. We recommend using USDC on Base for the best experience. 🤢