Why RPI Market Making Is Thicker: Exchanges Begin Screening Order Flow for Market Makers
TREE NEWS reports: Retail Price Improvement (RPI) order types are gaining traction on crypto exchanges, and new analysis of XAU order book data suggests the mechanism is quietly reshaping market-making economics. Despite lower execution priority and restrictions that prevent API bots from directly taking liquidity, RPI orders are attracting significant market-making capital. The reason: RPI limits the types of counterparties that can interact with resting orders, adds matching protections, and offers special fee schedules—all of which reduce adverse selection from arbitrage bots and high-frequency traders.
The Toxic Flow Problem
In traditional crypto order books, market makers face constant adverse selection. Sophisticated bots detect stale quotes and pick them off within milliseconds, forcing makers to widen spreads or withdraw liquidity altogether. RPI changes this dynamic by creating a segregated pool where only certain order flow—typically retail or non-toxic flow—can interact with maker quotes. This allows market makers to earn more stable returns with less toxic flow, even if their fills are less frequent or have lower priority.
Depth Alone Is Not Enough
The presence of deep RPI books indicates that capital is willing to enter, but it does not prove that RPI offers a structural advantage. To truly assess whether RPI improves market-making profitability, analysts need to compare markout performance—the price movement after a trade—between RPI fills and ordinary maker fills. If RPI fills consistently show better markouts (i.e., less adverse price movement), then the mechanism is genuinely reducing toxicity. If not, the depth may simply reflect temporary incentives or fee rebates.
Exchange-Led Flow Screening
This development marks a shift: exchanges are no longer neutral venues but are actively curating order flow to protect market makers. By screening counterparties, exchanges are essentially internalizing the role of a smart order router that prioritizes non-toxic flow. This could lead to a two-tier market structure where retail flow gets better prices and tighter spreads, while arbitrageurs and HFTs face higher barriers. However, it also raises questions about fairness, transparency, and the potential for conflicts of interest if exchanges favor certain participants.
Forward-Looking Perspective
As crypto markets mature, expect more exchanges to experiment with RPI-like mechanisms to attract liquidity providers. The key test will be whether RPI improves overall market quality—narrower spreads, deeper books, and lower volatility—without fragmenting liquidity or disadvantaging certain trader segments. Regulators may also take interest in whether order-flow screening constitutes fair and orderly trading. For now, the data suggests that RPI is more than a gimmick: it is a structural innovation that aligns exchange incentives with market-maker profitability.
