Ask HN: What's the best Web based API you ever used?

Stripe. Streamlined and well-documented.

I liked ones that I used and had Swagger documentation, that way you can easily make API calls in the API's documentation. Take for example pipedrive: https://developers.pipedrive.com/v1

Parse. I like APIs you can copy/paste into javascript and build an MVP and worry about fail-proof server-side integration for production later.

Whatever web API I use I like it to be documented in automatic way so that is always up to date. Especially in first phase API changes, and I remember bad days spent in discovering the new version of some Facebook api before they get published..sort of MSDN black box hell

Another vote for stripe. I know of many junior web devs cutting their teeth on stripe. It's too easy.

Do SDKs count? AWS has been great so far.