From what I've seen this link.
https://cryptofresh.com/assetsLast 24h volume of top Openledger's UIAs;
OPEN.BTC:$303,554
OPEN.ETH:$39,353
OPEN.MUSE:$13,486
OPEN.USDT:$13,344
SUM:$369,736
All of these market fee are 0.2%
Daily profit is 0.002 * $369,736 = $739
Monthly is = $22,170
There is also a profit source from a difference of exchange rate between fee pool and market.
For example, OPEN.BTC's exchange rate at fee pool is 0.000016 OPEN.BTC/BTS
And exchange rate at market is about 0.000052 OPEN.BTC/BTS
Current fee of place order is 0.01213 BTS = $0.0015769
So profit from one trade is
(0.000052/0.000016) * $0.0015769 = $0.005124925
And from what I've seen trade history, there are about 80 matched orders in 1 hour.
So daily profit from difference of exchange rate at OPEN.BTC:BTS is
80 * 24 * $0.005124925 = $9.839856
Monthly is $295
And other markets are not so big, so I don't calculate.
I think, there is also profit source of invitation of members.
Does anybody know how large is it?
If it's not so big, I think monthly profit of Openledger is $25,000 ~ $40,000, of course it's very volatile.