I have been using several MT4 SP500 futures data feed, but they seem to all be deprecated. Is there another free source for this?
Alpari still has front month (Z1) CFD. Quoted one to two ticks wider than the CME feed. And it runs about 250 ms behind. There is an arb or at least a front-run there, even after the wider spread, but you can't do it for size or for long without being booted.