Definition
Hybrid routing is an order execution model that combines elements of both A-Book (external routing) and B-Book (internalization) within a single broker infrastructure. The broker dynamically decides which orders to route externally to LPs and which to internalize on its own book, based on predefined criteria such as client profile, order size, instrument, market conditions, or profitability metrics.
This model is arguably the most common in the retail FX industry, as it allows brokers to optimize revenue while managing risk. The hybrid approach is not inherently negative -- when properly disclosed and managed, it can offer execution quality comparable to pure A-Book for externally routed orders while providing the fill certainty of B-Book for internalized flow.
What It Is / What It Is Not
What Hybrid Routing IS
- Combination of A-Book and B-Book routing within one system
- Dynamic routing decisions based on rules or risk parameters
- May route by client segment, order size, instrument, or volatility
- Allows the broker to manage risk more flexibly
- The most common model in practice among retail FX brokers
- Can include partial hedging or netting of internalized positions
What Hybrid Routing IS NOT
- Not automatically a red flag or deceptive practice
- Not a label brokers typically use in marketing (usually claimed as 'STP' or 'NDD')
- Not the same as having no execution policy -- routing rules still apply
- Not always client-adverse; depends on implementation and disclosure
- Not a fixed model -- routing rules can change based on business decisions
- Not exclusive to unregulated brokers -- Tier-1 regulated brokers use hybrid models
Common Routing Logic Patterns
Hybrid brokers typically use one or more of the following criteria to determine routing:
| Criterion | A-Book Route | B-Book Route |
|---|---|---|
| Client profile | Consistently profitable clients | Statistically losing or new clients |
| Order size | Large orders above threshold | Small orders under threshold |
| Instrument | Major pairs with deep LP liquidity | Exotic pairs with thin LP coverage |
| Volatility | Normal market conditions | High-volatility events (widen risk control) |
| Net exposure | Hedged when aggregate risk exceeds limits | Retained when offsetting positions net out |
Benefits & Trade-offs
| Factor | Detail | |
|---|---|---|
| Risk management | Flexible: broker can hedge what it needs, internalize what it can manage | |
| Revenue optimization | Captures both commission/markup (A-Book) and trading revenue (B-Book) | |
| Fill quality for small orders | Small orders internalized may get faster, more predictable fills | |
| Transparency | Routing decisions are usually opaque to the client | |
| Conflict of interest | Conflict exists for B-Booked segment; severity depends on routing rules | |
| Consistency | Different clients may receive different execution quality on the same instrument |
Common Marketing Claims vs Reality
| Claim | Reality |
|---|---|
| "We are STP/NDD" | Many brokers claiming STP/NDD operate hybrid models. Check whether the execution policy acknowledges internalization or counterparty risk. |
| "All orders go to LPs" | Unlikely for 100% of flow. Small orders, exotic pairs, and volatile periods are commonly internalized even by "A-Book" brokers. |
| "No conflict of interest" | If any portion of flow is B-Booked, a structural conflict exists for that segment. Transparency about routing rules is key. |
What to look for in an Execution Policy
- Does the execution policy acknowledge that orders may be internalized?
- Are the criteria for routing decisions (A-Book vs B-Book) disclosed?
- Does the broker publish what percentage of flow is externally hedged?
- Is client segmentation mentioned in the conflict of interest section?
- Does the policy explain how profitable vs unprofitable clients are treated differently?
- Are there separate execution quality metrics for A-Booked and B-Booked flow?
See a Public Routing Disclosure Example
NDD.broker publishes detailed order routing and execution policy documentation, including LP composition, priority logic, and conflict mitigation. This serves as a reference implementation of the concepts described above.
Educational content only. This is not financial advice. Always consult qualified professionals before making trading decisions.