Can I use this library in paid Marketplace content?

Yes, You can use this library in paid Marketplace content.

Do I need to credit it in my Marketplace listing?

Credit is not required, But is appreciated.

What license does this use, and what does it allow commercially?

The MIT license lets you use, modify, sell, and distribute the software commercially.

Do I need special permission to use this in client work or commissions?

No permission needed.

Can this library be used in closed-source or obfuscated Marketplace packs?

Yes, This project can be used in closed-source or obfuscated Marketplace packs.

Is Mojang or Microsoft affiliated with or endorsing this library?

No, Mojang and Microsoft are not affiliated with or endorsing this library.