Probably SQS due to its simplicity :) But SNS + SQS is the most flexible and still fully serverless option.

Google makes it actually even easier with Cloud Pub/Sub - they have just a single service for all use cases.

Yes, Cryptocompare is such a great API for tutorials, you don't even need to register for an API key, it just works.

Data Engineer, M.Sc. in BI, AWS Certified Solution Architect: www.annageller.com. Get my articles via email: https://annageller.medium.com/subscribe