A-Book vs B-Book
Two fundamental order execution models that determine how a forex brokerage handles client trades and generates revenue.
Definition
A-Book and B-Book refer to two distinct execution models that forex brokerages use to handle client order flow. In the A-Book model (also called STP or ECN), client orders are passed directly to external liquidity providers such as banks, hedge funds, or ECN pools. The broker earns revenue through commissions or spread markups without taking market risk. In the B-Book model (also called market making or dealing desk), the broker internalizes client orders and takes the opposite side of the trade, profiting when clients lose and losing when clients win.
Most modern brokerages operate a hybrid model that combines elements of both approaches. Profitable and high-volume traders are typically routed to the A-Book to eliminate risk, while smaller or less experienced traders may be placed on the B-Book where the statistical probability favors the broker. This hybrid approach optimizes revenue while managing risk exposure.
The choice of execution model has significant implications for the broker's risk profile, revenue structure, capital requirements, and regulatory obligations. Regulators in some jurisdictions require disclosure of the execution model, and certain license types may restrict which models can be used.
- A-Book: orders routed to liquidity providers
- B-Book: orders internalized by the broker
- Hybrid: combination based on client profile
- Revenue: commissions (A) vs client losses (B)
- Risk: low (A-Book) vs variable (B-Book)
Key Points
A-Book Advantages
No conflict of interest with clients. Predictable commission-based revenue. Lower capital requirements since the broker does not absorb market risk. Transparent execution that builds client trust and supports regulatory compliance.
B-Book Advantages
Higher potential revenue per trade since the broker captures the full spread and benefits from client losses. Tighter spreads possible since there is no LP markup. Faster execution without external routing. Better for micro-lot accounts that LPs would reject.
Hybrid Execution
The most common approach among established brokers. Client flow is analyzed in real time and routed based on profitability, volume, and risk parameters. Smart routing algorithms optimize between A-Book and B-Book automatically.
Risk Management
B-Book exposure must be actively managed. Brokers monitor net exposure, hedge large positions, and set limits on maximum risk per instrument. Without proper risk management, a string of winning client trades can create significant losses for the broker.
How It Relates to FXUP
FXUP's MT5 white label platform supports A-Book, B-Book, and hybrid execution models. Brokers choose the execution approach that matches their business strategy and regulatory requirements. The platform includes bridge technology for A-Book routing to liquidity providers and dealing desk tools for B-Book management.
Risk management dashboards provide real-time visibility into exposure across all execution models, helping brokers maintain control over their risk profile.
- All execution models supported
- Bridge technology for A-Book routing
- Dealing desk tools for B-Book
- Real-time risk monitoring
Choose Your Execution Model
FXUP supports A-Book, B-Book, and hybrid execution. Configure the model that fits your strategy.
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