Bilateral Internalizer Crossing Toll
The Formal Definition
The hidden economic cost borne by retail and institutional order flow when a broker-dealer routes trades directly to an off-exchange wholesale market maker who internalizes the order against proprietary capital rather than exposing it to competitive midpoint matching on lit public books.
Bilateral Crossing Toll = Quoted Lit NBBO Half-Spread - Actual Realized Price Improvement Credit ($)
Cole Barrett's Reality Check
The Unvarnished Bottom Line"Internalization is how retail brokers fund '$0 commissions.' The broker takes your order, hands it to an off-exchange wholesaler on a silver platter, and collects a kickback. The wholesaler fills you just a hair inside the public quote, pockets the rest of the bid-ask spread, and pays zero exchange clearing fees. You get a microscopic discount, and the house takes the spread."
Interactive Simulator: Test the Math
Real-World Example: Scenario Breakdown
Examining the real numbers for: Simultaneous execution of a retail market buy order for 1,000 shares of a stock with an NBBO of $50.00 Bid / $50.10 Ask
| Execution Metric | Lit Exchange Midpoint Match User | Bilateral Internalized Retail Client |
|---|---|---|
| Fee / Rate | $0.0035/share DMA rate ($3.50 total) | $0 advertised commission |
| Spread / Buffer | Order routed directly to a public lit exchange order book with midpoint crossing instructions | Order routed to an off-exchange wholesale market maker under a payment for order flow arrangement |
| Execution / Status | Matched against an incoming independent seller at the true $50.05 midpoint ($0.05 price improvement per share) | Wholesaler provided an advertised 'price improvement' of $0.0010 per share, filling the order at $50.099 |
| Total Cost / Result | Captured genuine midpoint price improvement on a transparent lit exchange | Received token price improvement while wholesaler monetized the spread |
How Brokers Weaponize This Term
Review your broker's SEC Rule 606 quarterly disclosure reports. Check the percentage of retail equity orders routed to non-exchange market makers (like Citadel Securities, Two Sigma, or Virtu). If over 80% flows to wholesalers, your orders are subject to bilateral internalization crossing tolls.
Broker Evaluation Matrix
Cole Approves
Interactive Brokers: Operates true transparent agency execution through SmartRouting, directing orders across lit exchanges and independent venues rather than captive internalizer desks.
Read Audit →Cole Flags / Avoids
Zero-Commission PFOF Apps: Routes 100% of retail market orders to wholesale internalizers that use token price improvement to monetize customer flow.
View Trap Details →Frequently Asked Questions
Why is order internalization legal?
Because current regulations only require the internalizer to match or improve the displayed National Best Bid and Offer (NBBO). Even a 1/10th of a cent improvement satisfies statutory best-execution rules.
How does internalization hurt the broader market?
It siphons clean, non-toxic retail orders away from lit public exchanges, leaving lit books thinner and wider for everyone else.