Interesting. I don't know much about this sort of stuff. Seems like a different animal than the proof-of-stake staking I've been playing with. According to the article below its all about "shared pot".
I'm in!
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Yes, totally different. Proof of stake is about participating in the transaction validation process for a blockchain itself. You delegate your coins to a validator, the validator publishes/approves the transactions that make up the chain.
Liquidity pools are a decentralized method of exchanging tokens held on a particular blockchain. You stick equal values of Token A and Token B in a pool and let any address trade A for B or vice versa by simply sending the token to the pool smart contract. The pool charges a small fee, which goes to the liquidity providers. The pool site will also generally incentivize the pool by adding additional rewards in the form of governance tokens for the pool project itself.
If you look at https://polygon.curve.fi/pools and see the atricrypto3 pool - this is a liquidity pool created by Curve, one of if not the most solid DeFi projects out there, and hosted on the Polygon (MATIC) blockchain. MATIC uses EVM, which means it functions identically to Ethereum, but at a fraction of the gas. Atricrypto3 is a pool that consists of DAI, USDC, USDT, and wrapped BTC and ETH. It allows people to trade at very low slippage between those three stablecoins, BTC, and ETH. It has trading returns of 6.63% plus additional CRV (the Curve gov token) of 20% and additional wrapped MATIC of 11% (at the moment. These change constantly). You can sell off the CRV and wMATIC at Quickswap back for stablecoins. Every transaction costs fractions of a cent.