How can I pay for OpenAI?

Hello, I'm interested in using OpenAI's services but I'm not sure how to proceed with payment. Can you please clarify the various payment options available for OpenAI? Are there any credit card options or do I need to use a specific cryptocurrency? Also, is there a subscription plan or can I pay on a per-use basis? I'd appreciate any information you can provide to help me make an informed decision about how to pay for OpenAI's offerings.