Right but I'm only seeing pretty low interest on those platforms, which doesn't compensate for the risks of smartcontracts and going outside the usual financial system. Did you have a specific one you think is worth it?
For example, on Compound, USDC only pays 0.82%, or 1.3% if you count the COMP token rewards.
Also I don't think you can invest just in USDC on Curve, you have to do a pool that exposes you to some other currency, although I think DAI is solid and Curve has a cUSDC/cDAI pool: