They ensure there’s always a buyer or seller available, reducing slippage and tightening spreads. Examples: Prime XM, FXCM Pro, LMAX, GBE Prime, B2Broker, Match-Trade. They may offer multi-asset liquidity (FX, crypto, commodities, indices, etc.).
They supply the infrastructure for B2B brokers: Trading platforms (e.g., MT4/MT5 white labels, cTrader) Bridge & aggregation software (e.g., OneZero, Gold-i) CRM systems, Client portal, back-office, payment gateways Risk management tools
Firms like B2Broker and Tools for Brokers offer both tech + liquidity in one package for new or scaling brokers