Any SaaS API management solution for a one personne SaaS product?

Hello,
I'm wondering if there are any valid SaaS to properly manage API?

Features I'm mostly looking for are:

• throttling (burst)
• quotas (nb of calls authorized within a month)

That's fairly simple to implement but if there is an out-of-the-shelf working tool, that would be nice. I don't want anything complex since it's to integrate in a tool I'm working on (alone).

Thanks!