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Is it possible for me to keep my credit card APR at 0% permanently?
No. There is no incentive for the card issuer to permanently loan you money for free (Even though they make a small amount of money with every transaction). Yes, there are many credit cards that offer introductory 0% APR, often lasting for a year, some even two years. In theory, you could keep applying for new cards with these terms, and continually transfer the balance to the new card (Though you would probably incur a fee for doing so).