OneChronos Launches Auction-Based FX Platform
Posted by Colin Lambert. Last updated: March 13, 2026
Fragmentation in FX markets continues with the launch of OneChronos FX, an auction-based spot FX trading venue that follows a similar model run by the firm in equities markets.
The launch marks the firm’s first expansion beyond equities, and brings its “Smart Market” design to one of the FX world. Smart Markets optimise for measures of trade quality through matching technology, and underpin OneChronos’ US ATS equities trading venue that the firm says facilitated an average of $12.66 billion in daily trading volume in January.
It adds that OneChronos FX integrates into established trading workflows, enabling coordinated, multilateral clearing within familiar currency execution practices. The venue is targeting reduced signalling risk, legging costs and adverse selection by allowing users to express multi-pair trading interest within a single auction cycle. Eligible orders are then cleared through a coordinated optimisation process, rather than piecing together execution through sequential bilateral trades. OneChronos says this structure is designed to increase price improvement and reduce information leakage.
“Our goal is to bring coordinated clearing to spot FX in a way that fits how firms already trade,” says Blaise Sheppard, head of FX at OneChronos. “We’ve proven in equities that multilateral auctions can improve pricing and reduce information leakage. Our new FX platform builds on that foundation and extends the same approach to multi-currency and portfolio-level execution.”
The platform is structured like an ECN with an auction roughly every 100ms, in a blind, dark, environment and with a central counterparty. Participants can send orders and are free to cancel and replace at will before the start of the cut off time for each auction, at which point the auction closes. In a differentiator to the widely-recognised FX model, there is no FIFO (first-in-first-out), therefore the time of arrival has no bearing on an order’s place in the auction, as long as the order arrives in time for a given auction.
“At the beginning of the auction, groups of orders are presented in various amounts, pairs, rates etc, and we solve what is effectively a math problem,” explains Sheppard. “Our model works out how to optimise or maximise the value, in notional, price improvement, dollars terms, by putting all the orders together to work the optimal distribution of trades that delivers the highest notional price improvement back to the participants [as a group].
“We have two solutions in the configuration that both distribute an equal amount of price improvement to the participants, our secondary objective is to maximise the volume cleared,” he adds. “While this is occurring, we lock everyone up for 30ms, after which participants receive a partial fill, full fill, or, if they have tried to cancel in the 30ms window, a confirmed cancellation. Unfilled orders roll to the next 100ms window without needing any action from the participant. As a guide, on our equities ATS, an order life lasts anywhere from milliseconds to several seconds and participates in multiple auctions”
The FX venue leverages OneChronos’s proprietary combinatorial auction technology that has been operating in equities markets for more than four years. The firm says the multilateral matching approach can surface trading opportunities that continuous or bilateral structures often miss.
“The two critical targets for us were not to interrupt the workflow of spot FX traders, and to minimise signalling risk, “Sheppard explains. “Participants only get a message is if they receive an execution – it is also with a central counterparty – and we don’t reveal anything about the broader structure of the aggregate auction results. Winners also do not know the composition of their trade, it could be a single, or multiple fills. Because we prioritise orders based on price and size rather than price and time, this makes information seeking much more expensive that the traditional CLOB model.”
The Full FX View
So, two things I often remark that FX doesn’t need is another trading venue and a shift towards an equity market structure, so why do I like this idea? Well, the reality is this is a model that operates successfully in US equities, but is actually based more upon an OTC market structure function – therefore it could be argued, the idea is coming back to one of its origins.
The key factors here, as noted in our article, are that OneChronos FX does not interrupt the workflow – more on this later – and, most importantly, avoids the information leakage that is so prevalent in equity markets when a dark pool isn’t operating. Under the model, as I understand it, “fishing” for information by placing orders will be an expensive business and not to the liking of the type of firms that do that.
What is also intriguing about the new venue, however, are the opportunities it could present down the road. While it would not be a TCA model as such, as data is collected, OneChronos should be able, in general terms at least, to offer some interesting information to participants about how much more business they could match with tweaks to their input model. Is improving one-tenth of a tick in certain pairs worth it? Would trading at a slightly different time see better potential price improvement? There is a lot of good work done in this area already, the sense is OneChronos could offer a slightly different flavour.
Equally, if the FX venue takes off and sits alongside the equities ATS, the firm could potentially offer joined up equities/FX execution, using ‘if done in equities’ FX orders for example. I remain a sceptic on multi-asset class execution venues, mainly because the chase for every basis point too often means better value on components are available elsewhere, but in a model that is all about price improvement? That shifts the dynamic slightly.
My understanding of the pricing model is that both parties to the trade pay, which is sensible given it is matching principal interest, if the buy side does get involved in the venue, via prime brokers or executing brokers, the major LPs might like this.
The likelihood is that OneChronos FX, as a dark venue, probably will sit in closer competition with Fenics’ MidFX than other venues. If the model works then a broader set of participants than are likely to currently operate on MidFX will see it is an opportunity to clear larger amounts without the risks associated with using an algo or trading in a public (or semi-public) environment.
Whether the new venue steps into competition with venues like EBS Market, CME’s FX futures, LSEG’s Matching and LMAX Exchange is an unknown. Those venues often thrive in uncertain environment, such as we have now, but still do not lend themselves to exiting larger risk. This means there is a chance that OneChronos FX will operates in a small niche in the market between the dark peer-to-peer and the all-to-all models, in which case success or otherwise could come down to one thing – onboarding.
The firm is used to operating in fragmented markets so entering FX should hold no fears, especially if it does find a niche. It is difficult to differentiate in equities, but the ATS has gone top 10 in the US, so the model must be popular enough. The problem as it approaches FX is an unseen blight on the landscape – the time it actually takes participants to connect.
The FX landscape is littered with the remains of firms or ideas that couldn’t remain afloat long enough for major participants to actually start using it. If OneChronos FX can surmount this obstacle – and it is coming from a stronger position than many new entrants – then it’s model should be different enough to ensure it has every opportunity to succeed.
Since launching its US equities ATS in 2022 and as of the end of January 2026, OneChronos says it has facilitated approximately $2.85 trillion dollars of institutional securities transactions. It is now ready to take on FX.
“Spot FX is a natural extension of what we’ve built,” says Kelly Littlepage, CEO and co-founder of OneChronos. “We’ve already shown in US equities that Smart Markets can materially improve how markets clear. Bringing that model into spot FX for the first time is a meaningful market-structure step. By clearing trades in the new spot FX venue through coordinated, multilateral auctions within familiar workflows, Smart Markets can deliver better prices, reduce information leakage, and improve execution quality for portfolio-level FX trading.”
