The link to hive-engine's market maker is: https://dswap.trade/

I'm am not the best to explain. Basically a market maker is a person or bot who places limit bids and asks simultaneously on the market to try and collect the spread.

Let's say AAPL price is $120. If I place a bid on the market for 119.95 and an ask on the market for 120.05 and both are filled then I made 0.10. In order to do this, I need dollars and shares of AAPL. Not sure if you were asking for explanation or link :-) Basically my explanation sucks and you would need to do some research to figure it out.

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