How do you compare the quote from your broker to the other markets?

Hello everybody! How do you compare the quote from your broker to the other markets (maybe for spike check) ? Any free and accurate datafeed is good for comparison?

Another questions about spread, in MT4, I cant get the spread in backtesting by MarketInfo and (Ask-Bid). I am using IBFX. How about your broker ? I hope to take into account for the spread historically because in my strategy I will filter the trade if the spread widen a lot. If I know, I can analyse my trades more accurately. Thank you !!

There is no central forex market, so every feed will be unique.

You can open several demo MT4 accounts with various brokers and check them side by side.

Thanks but do you think that the demo accounts link up with real feeds? Which broker(s) offer real feed for demo accounts?

Er, the closest free thing to a real feed you'll find is an ECN demo account through EFX group.

The MIG demo runs fairly close to my broker. Within 1 pip or so (occasionally 2).

thank you all of you !! is there an expiry date from it?

besides, have you ever experienced any broker that their real feed is different from their historical data ? for example, in real-time there is spike but not shown in backtesting data. I think we need to store the quote in real EA trading for verifying this if we have to...