Some issuers provide checks drawn against your credit line that can be deposited into a checking account.
Services like Stockpile allow you to buy gift cards for fractional shares using a credit card, which are then redeemed for stock.
While major platforms like and Robinhood require a linked bank account or debit card for funding, you may find workarounds:
The mathematical hurdle to making a profit is extremely high when using credit. Can You Buy Stocks With A Credit Card — And Should You?
You can withdraw cash from your credit card, deposit it into a bank account, and then transfer it to your broker.
Some fintech apps or digital wallets may allow you to fund an account with a credit card and then move those funds to a brokerage. Why It Is Generally a Bad Idea