I would rather suggest you to use services of discount brokers like Fxview and XTB. They will offer you support and guidance through their use of latest technology in providing analytical tools for scanning markets and predicting trends. You can automate your trades as well on Fxview, and install alerts.
But not nearly as exclusive and limited as darjeeling. You definitely won't find anything about that here on this forum.
The broker has to support trading in the specific contracts even for supported exchanges, for example Amp does not allow trading in 6M Mexican Peso futures, BTC Bitcoin futures, or TN 10 Year Ultra T Note Futures last I checked. BTW, where can one trade the Bitcoin perpetual contracts or a way to hold it longer term without monthly expiry, with leverage from the US?
Here is list of all currently available contracts you can trade at AMP: https://www.ampfutures.com/trading-info/margins/ Just added Mini CBOE Volatility Index (VXM) https://news.ampfutures.com/mini-vix-ready-for-live-trading