OK - what's the catch?
GJ
None really, other than if you have problems, it's a bit difficult to complain too much considering the price. At the moment, I'm just subscribed to real time US stocks and options Level I, which costs the princely sum of $4 per month -all excahnges. You get up to 1000 instruments, though an instrument is really an exchange/instrument pair. They only charge exchange fees for RT data. You can get everything 20 mins delayed for free.
I haven't used it all that much yet, but it seems reasonably reliable and timely. I've had a couple of freezes, but that could be my code and I haven't investigated properly yet. I found a couple of bugs in the Java API. It is open source so I fixed them without having to sit around for days or weeks waiting on some vendor to do it.
I like the API - it is well designed and fairly easy to use. The historical data API is
much better than IB's which I think is horrible.
I've only been using 1m historical data for stocks. The last couple of years seems OK, but before that there are some big chunks missing in 2005. I think it starts in 2003, but some of the data that far back is a bit ropey. They keep promising to fill the gaps, but it hasn't happened yet.
I like it because there are no stupid obstacles. No idiotic, half baked "desktop API" like eSignal, you don't have to cough up $300 like DTN for API doc, just to see if you might be interested. There is no extra crap to run on your machine - just an API library which connects direct to their servers. If they sort out a few problems, it could be very promising.