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no, it uses distributed hashtables to find stuff.

Not for basic features. There is discussion about using smart contracts via ethereum to enable some eCommerce/dynamic kind of flows in a distributed way, but there are non-blockchain alternatives being talked about too.

I believe there's some work being done to use cryptocurrency micro payments as a layer on top of IPFS to incentivize data storage.

edit; Filecoin, https://docs.filecoin.io/about-filecoin/ipfs-and-filecoin/#d...

Not at all.

The people that make it are developing a blockchain product that uses IPFS, but that is totally separate.