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A comment on Show HN: Stock Trading with Insomnia REST Client and Alpaca API. Parent comment

Re:Show HN: Stock Trading with Insomnia REST Client and Alpa... by gbrits on Saturday December 15, 2018 @06:35AM (#18688024)
So the market maker who pays for order flow data takes the spread. But how are they able to trade with the buyer at $100.01 when there are limit asks on the book already at that price? Seems they need to cut the line?
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Re:Show HN: Stock Trading with Insomnia REST Client and Alpa... by vostok on Saturday December 15, 2018 @07:15AM (#18688102)
That's part of thr reason that they pay for the flow. They're able to sell at $100.01 off exchange even if there was someone else who was willing to sell at $100.01 on the exchange first.

This also why I think payment for order flow is bad even if the first order effects are not bad for Robinhood customers under reasonable assumptions.

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