What is the difference between IXP and ISP?

Could you please clarify the distinction between IXP and ISP? Are they both related to internet connectivity, but in different ways? How do they function in the broader context of technology and finance, particularly in the realm of cryptocurrency? Is there a specific use case or scenario where one might be preferred over the other? I'm interested in understanding the fundamental differences and how they might impact various aspects of online transactions and data transmission.