I see that some binary option brokers offer trading on weekend of major currency pairs like EURUSD, GBPUSD, USDJPY etc. They are all OTC, i.e. there are some specific dealer which forms prices. Any ideas what is the source of their price feed? Your replies are much appreciated.
LMAX has weekend trading on FX (they just implementing, so you need to check it). Also IG has weekend FX pairs. Some crypto exchanges also have weekend EURUSD or EURUSDT (or maybe other pairs also) trading (Kraken, Binance, Bitstamp, FTX) There is also another option - knowing the statistics (as in binary options they work as casino) they just "make" market (of course there is no real market making involved) - so there is no external data provider.
As Mike says, LMAX is probably the best, most liquid. But also as Mike says, the Crypto exchanges are starting to get a foothold in the business. Wouldn't be surprised if they take most of the weekend action in 1-2 years. Steer clear of ALL Binary brokers, 100% scammers, no exceptions.