Integral

Official Website: https://integral.com/
Platforms: MetaTrader | Proprietary
Asset Class: Forex

Integral is one of the older players in the B2B broker space, often touting that they were cloud technology before the world knew what cloud was.

Based in Palo Alto, California, Integral was founded in 1993, offering price and liquidity aggregation for currency markets, an MT4 bridge, and a free online source of historical tick data on their TrueFX website. (More recently, it seems TrueFX is no longer entirely free.)