What are some alternatives?
When comparing Marvel (Comics) API and Tapas, you can also consider the following products
Comixology Unlimited - Netflix for comics and graphics novels by Amazon
Piperka - Webcomics listing and subscription manager
DC Universe - The DC Comics streaming service w/ original content
GlobalComix - Professional Comics Publishing
LINE Webtoon - LINE Webtoon is a digital comics platform with various comics for free on web and mobile.
MangaDojo - MangaDojo is a community for manga artists and readers from all around the globe!