FX Central Limit Order Books Trading Gains Traction, but Swaps Face Key Challenges

FX central limit order book trading provides an effective mechanism for managing market volatility with new platforms promising to further reduce market impact and improve access – but the trading of swaps presents some notable challenges.

In 2024, $148 billion average daily notional volume was traded across CME Group’s FX futures, options and cash markets with over $100 billion traded on the EBS Market and futures and options central limit order books (CLOBs).

Effective During Volatile Period

The growth in trading volumes and number of customers significantly bucked the trend of an overall downturn in FX volatility, with the CME Group volatility index showing that levels were down 10.5% compared with 2023 observes CME Group's Global Head of FX, Paul Houston.

“Despite this, the year was punctuated by several large episodic spikes in volatility driven by escalating geopolitical risk, central bank actions and major elections - all of which saw market participants turn to cash, futures and options CLOBs to effectively manage currency risk,” he says.

Nick Carey, Global Head of FX Options at TP ICAP also refers to periods of volatility in 2024 being reflected in CLOB trading volumes, while LSEG’s strategic lead - FX spot, Paul Clark, says there was both overall volume growth on spot matching and volume peaks at times of market turbulence, particularly in the second half of the year.

“The firm pricing and direct access characteristics of CLOBs make them particularly effective during volatile periods as participants can immediately see and act on real market levels rather than wait for responses to quote requests,” says Alvin Chopra, Chief Operating Officer SpectrAxe.

As for how FX CLOB venues have responded to changing market dynamics, Jeff Blanco, Director of Institutional FX Sales Canada at StoneX, references the push for firms to provide access to both listed and OTC FX markets in a ‘one stop shop’ model.

Platforms have implemented solutions such as full trade anonymity, automated expiries, consolidated credit relationships and API connectivity says Chopra. “We are seeing venues focus on reducing operational overheads while dramatically expanding available counterparties,” he continues. “The most successful innovations include real-time credit monitoring, automated market surveillance and seamless integration with existing workflows through STP connectivity.”

Platforms Adding More Features

LSEG added a feature to its spot matching CLOB late last year that allows participants to submit passive orders for six currency pairs at a higher price granularity than the market data is published. The objective is to enable participants to submit orders and get interest filled with reduced market impact and for takers to get the benefit of price improvement.

CME implemented quarter pip increments for EUR/USD and AUD/USD on EBS Market and moved to a single liquidity pool for NDFs in 2024. However, perhaps the biggest change is to come in March with the launch of its all-to-all spot CLOB FX Spot+, which will use implied matching technology to create spot prices from FX futures liquidity while allowing resting liquidity in the FX Spot+ order book to be shown in the futures order book.

The head of FX trading at BlackRock recently called for FX swaps to be traded via central limit order book. According to Robin Nicholas, Head of Swap Product at 360T, this would represent a positive development for the marketplace, serving as a valuable complement to existing electronic RFS trading.

Houston suggests the evolution of the FX swap market is at an important turning point and that the changing interest rate environment has contributed to strong volumes but also highlighted the opportunity to electronify a market traditionally traded on a bilateral and balance sheet-intensive basis.

“Moving FX swaps to CLOB trading would likely bring substantial benefits in terms of market efficiency and transparency,” says Chopra. “Similar market structure transformations have consistently delivered major reductions in transaction costs, significant improvements in execution speed and meaningful increases in available liquidity, while the price discovery process would improve through transparent order books, reducing information leakage compared to current RFQ models.”

The Industry Must Be Willing to Boost Transparency

A key question here is what the conditions for accessing credit on the CLOB would look like. Many banks that NCFX speaks to are in wait-and-see mode when it comes to supporting a CLOB since the fragmented nature of the current market gives market makers pricing power and their ability to leverage their credit businesses reinforces this advantage says the firm’s Head of Research, Xavier Porterfield.

Swaps and forwards remain the most opaque parts of the OTC FX market. Even something as basic as adjusting from spot to trade on a broken date is remarkably non-transparent - many buy-side participants still rely on linear interpolation to estimate where the market is. For a CLOB to facilitate price discovery on broken dates it would require a diverse mix of participants and deep liquidity, which is no small task.

“The path to a CLOB for swaps would need serious industry support,” says Porterfield. “There is certainly an opportunity for a well-capitalised player to provide the credit needed to launch one, but history offers a cautionary tale. Any prospective sponsor would have to think long and hard about AIG Financial Products’ experience with credit default swaps in the early 2000s - lending out balance sheet to support a CLOB is essentially a very short gamma trade.”

The FX swap market has been slow to adapt to electronic trading and in theory, moving all swaps to a CLOB would have the same benefits as spot in terms of transparency and efficiency.

But Blanco refers to complexities around capital and trade size as well as credit in the forward market that would make such a move more difficult. “The benefit of moving swaps to a CLOB is more on the liquidity taker side than the liquidity provider,” he says.

In addition, swaps often trade off-the-run settlement dates, so matching bids and offers across multiple dates and currencies is imperfect.

“Successfully transitioning swaps to a CLOB model would require addressing market structure adjustment and market readiness which inevitably takes time,” concludes Patrick Bartle, Managing Director LMAX Exchange.