There is an decentralized AI/ML startup building something in this domain on top of Ethereum called Synapse.AI you'll want to check out if you're interested in Web3 stuff. They do both the data, algorithms, and other functionality to help autonomous agents grow.

Numerai also wants to monopolize Data and ML models in a decentralized way, and I believe that is also on Ethereum.

There is also Enigma, Doc.ai, and a few others if you're interested in this space.