Do I need to Purchase API first for Test Developing?

Hi, I’m Node js developer, Do i need to purchase first for test my app? I tried so many times but it show 429 error on console

The API is not free. The amount of token data sent to and received from AI models is billed. Newly-created accounts may have received a $5 credit towards usage, but this expires in three months, with many people having created accounts to use ChatGPT without being aware of OpenAI’s other services.

If you’ve never put a payment method into the API’s separate billing system, then you can review the billing overview, add a payment method, and then after adding a card, review purchasing prepay credits in order to use the API services.