We’re excited to report that BitMEX has reached all-time highs in trading volume in the last week. As trading volume increases, we are making optimizations to our trading engine and processes.

We expect to land many major optimizations in the coming days. Most will not have any visible changes, but the following may affect API connectors:

• Changes to Instrument bidPrice, askPrice, and midPrice will now be made on a 5 second timer, rather than on every update to the best bid/offer.

For most consumers, this should not cause an issue. If you need up-to-the-millisecond quote data, please use the quote subscription in the future. The quote feed has been present for years and always contains the best bid/ask:

{"table":"quote","action":"insert","data":[{"timestamp":"2017-05-25T19:43:27.493Z","symbol":"XBTUSD","bidSize":62,"bidPrice":2443.2,"askPrice":2447.4,"askSize":40}]}

This change will be effective Monday, May 29 at 12:00 UTC.

Thank you to our loyal traders for being a part of our growth!

There are a bunch of new features launching today. Let’s get right into it:

• Time In Force: We now support the following Time In Force (TIF) options on any Limit Orders:
  • GoodTillCancel – This is the default TIF, meaning the order is open until filled or canceled.
  • ImmediateOrCancel – When this is active, the order will execute as much quantity as possible upon placement, then cancel.
  • FillOrKill – Like IOC, but must fill the entire quantity. If it is unable to immediately fill its entire quantity, it will reject instead.
• Funding Cost: On the XBTUSD Swap, we now show an indication of what your next funding cost/rebate would be.
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• Advanced Order Option Indicators: When using advanced features like Time In Force, Hidden, Post-Only and the like, the options will now highlight in red so that you notice them. This should help with accidental hidden or post-only orders.
• Improved Indicative Unrealised PNL: On the active contract, we now work the order up the book to give you a better indication of what your close PNL would be with a market order. Hover on your Unrealised PNL to view.
  • The typical caveats apply: liquidity may change between the generation of this number and the execution of your Close order.
  • We show a coarser indicative PNL for the inactive contract, as the browser only downloads orderbooks for the active contract.
• Improved Average Entry Price: On contracts like the XBT series, where the product has a different tick size than the index (e.g. 0.10 vs 0.01), we now show an average entry price rounded to the more precise size.
• Amend Stops on Chart: Stop orders now show on the chart, and their triggering prices can now be amended on the chart by dragging.
• Confirmation Dialog for Stop Price: If you set a stop price such that it would immediately trigger, either in the orders list or via the chart, you will now be prompted for confirmation. No more accidentally-triggered stops!
• Install to Homescreen: On Android, after a few visits, BitMEX will offer to install itself as a shortcut to your homescreen. This will load a cached version of the mobile site in fullscreen.
• Updated Login Notifications: Login emails now include the browser & country that BitMEX was accessed from.
• Performance Improvements and Bugfixes: This release contains nearly a dozen commits focused on edge-case bugfixes, data-saving, and performance. We intend to especially focus on mobile users in the future, with a native app coming soon. In the meantime, we’re making BitMEX faster and leaner so it’s usable on more devices.
  • Bugfix (Frontend): We fixed an issue where stale orders would sometimes remain in the list after a connection outage.
  • Bugfix (Frontend): We fixed a bug where the site would reach an inconsistent state if you attempted to view an expired or missing contract.
  • Bugfix (API): There were occasions where the realtime feeds would emit insert, update, or delete before a partial came through. This has been fixed.

This month, we’ve added a few new features to the UI:

• Animations now flash green and red to indicate if a number is increasing or decreasing! This helps you keep tabs on your position, the orderbook, and so on.

• Your Unrealised PNL can now be hovered upon, which will give you an idea of your PNL if you were to exit at market.
  • At this time, the calculation simply assumes a full exit at the best bid/offer. In future revisions, we will run a full book calculation taking into account current liquidity and your position size.
  • Even when the updated version hits, keep in mind that there is no guarantee present liquidity will hold by the time an order gets to the engine.
• We’ve made minor visual changes, including improvements to mobile rendering and speed.
• Our integration with Sierra Chart is complete! If you are interested in using Sierra Chart with BitMEX, start here.
• It’s now possible to place sell orders above a limit up price and buy orders below a limit down. This comes particularly in handy on pre-release contracts, like GNO before it traded on Poloniex. We have more such contracts in the works.

As always, contact us in the trollbox or at support@bitmex.com if you have any problems or feature requests!

The following will be effective 2 May 2017 12:00 UTC:

• The .GNOXBT Index will use the most liquid GNO/XBT spot exchange’s price. At this moment, it appears that the most liquid exchange will be Poloniex.
• GNOM17 will switch from Last Price to Fair Price Marking. Please read Fair Price Marking for more details on how this will affect trading.
• The Limit Up / Down restrictions will be removed.

The following contracts are now available for trading:

• ETHM17
• FCTM17
• DASHM17
• LTCM17
• XMRM17
• XRPM17