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I wanted to learn more about Liquidity in Hive's Defi. How we know the APRs?

There are some pools with rewards that have an APR. The best is to check it on https://beeswap.dcity.io/pools. You will see an APR for the ones with rewards.

Thanks didn't know about that. The pools with rewards also receive a small portion of the fees, when swaps happen?

I'm on a few here at Hive: ATX:SWAP.HIVE, DVS:DHEDGE, SWAP.HIVE:TRADE, CCC:WIT among others

Do you use them to swap? Or do you provide liquidity to them?

I usually leave it there to collect the rewards. Some of these pools provide token rewards that I'm after, so it's nice to be able to get some of these daily drops from the pools.