You fund with crypto you already hold. Card and bank rails need licensing we don't have.
Those prices move on single trades. We'd rather refuse than fire a rule on a number we don't trust.
A keeper reports the price to the contract today. Your spend cap, slippage cap and expiry bound what it can do. Reading the pool on-chain is next.
Tokenized stocks are issued for non-U.S. investors only, and carry risk of total loss.