Can I take out a hard money mortgage without a down payment?

No.

Hard money mortgage lenders do not check credit scores, employment, income, or other qualifications. The only way to mitigate their risk is to require a substantial down payment.

Most hard money lenders require a 35% down payment. No one offers hard money mortgages without a down payment.

See Also:

What is a Hard Money Mortgage?

Hard Money Lending Basics