I've actually just gone through the process of integrating my currency API [1] with Micro. I really liked the idea for this service and actually just emailed them asking your exact question! The process was smooth and I was impressed by their clear communication and very responsive development work.
I've been a user of RapidAPI as both an API publisher & consumer and I think I prefer this Micro model instead - API curation, standardized docs etc. etc. RapidAPI can feel like a bit of a free for all and even though it's technically one entity proxying everything it's often felt to me like more of a list of random services than something cohesive. I can definitely see why Micro is describing their service as a sort of AWS of useful APIs.
I've been a user of RapidAPI as both an API publisher & consumer and I think I prefer this Micro model instead - API curation, standardized docs etc. etc. RapidAPI can feel like a bit of a free for all and even though it's technically one entity proxying everything it's often felt to me like more of a list of random services than something cohesive. I can definitely see why Micro is describing their service as a sort of AWS of useful APIs.
[1] https://www.exchangerate-api.com