That does not have to be a MM...I actually think it is a ButtonTrader user, who has initially entered a 1 mln Order, but during the trade has Joined a 1 lot Lilac-FX-cash position, which he had in the opposite direction. (1mln minus 1 is 999,999). {You will see more of these odd-lots when ButtonTrader users are trading IDEALPRO. (I bit off topic to explain the Lilac-FX-cash here)}.
Interesting possibility. I just read up on the "Lilav-FX-cash" in your release notes. How did the user end up with 1 lot though, that is not clear.
Volume is amount traded. Liquidity is the depth and size of the book (ie. how easy it is to get in an out of a trade). thus tighter spreads with size on the bid/offer are more important to get an and out of a market as opposed to the volume traded. ie. If one large block trades, that isn't helpful if there is a wide spread.
Well, you get non-base budgets with every trade in a non-base Instruments (if your base is EUR, then a trade in ES gives commission and P&L in USD). These non-base-budgets are shown in Lilac-FX-cash, which you can convert back to your base (EUR) with a Join (drag/drop to a Forex-trade) or with an IDEAL trade (not a IDEALPRO)....very probably this trader used a IDEAL trade, but then you need to "guess" the correct number of lots to clean up the non-base budget to exactly zero...which is hard to do, and might leave a 1 USD rounding-error in your budget. {ButtonTrader does this "guessing" automaticly for you, most of times it results in a zero-budget, but not always}.
For an active traders there no way to trade other than with an ECN.Trading with a Broker you are at a huge disadvantage versus the market.For example if you compare prices there is no way a broker can compete with an ECN.I have now for a few months compared prices between Currenex and Saxo.If you trade Eur/Doll Doll/yen Doll/chf and some crosses like Eur/yen the difference of the spread makes a huge difference.I had the other day an example to show you why.I had an order to sell 5 mio Doll/yen at 95.the quote Saxo provided was 93.5/96.5 and Currenex 94/95.Then the price went 95/96 with Currenex and my order was done.This price was paid more than 5 times. Guess what happened with Saxo their best price was never better than 93.5.I think in the future that the Ecn model will increase and put a huge pressure on all these brokers to adapt and change their way of trading
The forex yen hasn't traded below 100 for years so I thought you might be looking at saxo's CFDs(the mini-futures) which have a wider spread than forex, and reverse the forex USD/Yen rate.