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Introduction

The decision in Kalen, Alexandru v World Exchange Services Pte Ltd represents the final stage of a representative action brought by 85 claimants (originally 86, with one settling) against World Exchange Services Pte Ltd (“WEX”), a Singapore-incorporated entity operating the now-defunct cryptocurrency trading platform, wex.nz. While liability for breach of both the User Agreement and a separate Buyback Contract had already been established at the summary judgment stage, the present proceedings were confined to the assessment of damages.

The judgment is significant for its detailed treatment of damages in the context of digital assets, particularly cryptocurrencies. It provides a principled framework for determining the appropriate valuation date, emphasising the central role of the doctrine of mitigation. Notably, the Court held that damages should be assessed neither strictly at the date of breach nor at the date of trial, but at a reasonable point in time after the breach when mitigation ought to have occurred.

Background

WEX operated an online platform facilitating the trading of cryptocurrencies and digital tokens. The claimants, represented by Mr Alexandru Kalen, maintained accounts on the platform pursuant to a User Agreement, which characterised WEX as a facilitator holding users’ funds in pooled accounts separate from its corporate assets. The agreement explicitly stated that WEX was neither a bank nor a fiduciary, trustee, or escrow agent.

In addition to the User Agreement, WEX entered into a Buyback Contract through public statements issued in September and October 2017. Under this arrangement, WEX undertook to repurchase or redeem its issued tokens within two years at a value equivalent to the underlying digital or fiat deposits.

From 12 July 2018, the claimants were unable to access, transfer, or withdraw their assets. Although the platform remained partially accessible through alternative URLs for a limited period, it became entirely inaccessible by December 2018. The claimants commenced proceedings on 13 September 2023, alleging breach of both contractual arrangements.

Procedural History

FThe claimants succeeded in obtaining summary judgment before the Assistant Registrar, a decision later upheld on appeal. The court found prima facie evidence of:

• The existence of contractual relationships under the User Agreement;
• The formation of the Buyback Contract;
• Breach arising from denial of access and failure to redeem tokens; and
• Resultant loss suffered by the claimants.

However, the quantum of damages was not determined at that stage due to insufficient evidence. The matter was therefore referred to the High Court for a full assessment of damages.

Issues Before the Court

The assessment of damages raised three principal issues:

1. Quantity Issue: What was the quantity of digital tokens and monies held in the Claimants’ accounts as of 12 July 2018?
2. Valuation Date Issue: On what date should the Claimants’ losses be valued?
3. Valuation Issue: What was the value of the tokens and monies on the chosen valuation date?

Decision and Reasoning

1. Quantity Issue

The claimants relied upon screenshots of their user accounts taken on various dates, supported by statements confirming no alterations or unauthorised transactions occurred thereafter. The Defendants challenged the credibility of these screenshots through three approaches (e.g., completeness of screenshot, type of cryptocurrency held, date of screenshot), concluding that no claimant satisfied all criteria for authenticity.

The court rejected the Defendant’s arguments. It held that the Claimants had discharged their evidentiary burden by providing the screenshots and statements affirming their authenticity. The burden then shifted to the Defendant to rebut this evidence. The court found that Defendants failed to do so, as their own conclusion stated it was “impossible to establish whether [the screenshots] were subject to editing.” Furthermore, the court found their methodologies to be flawed and based on unsupported speculation. Consequently, the court accepted the quantities as stated in the Claimants’ screenshots.

2. The Valuation Date Issue

The Claimants argued for the date of trial (the present date) as the valuation date, citing the volatility of cryptocurrencies and the continuing nature of the breach. The Defendant argued for the default “breach-date rule” (12 July 2018).

The court conducted a comprehensive review of the law, with the Court of Appeal’s decision in iVenture Card Ltd v Big Bus Singapore, which affirmed the “breach-date rule” while recognising the court’s power to fix “such other date as may be appropriate in the circumstances” where following the breach date would cause injustice. The Court of Appeal’s reference to Hooper v Oates established the critical link between valuation date and mitigation: the breach date is appropriate only where “there is an immediately available market for sale of the relevant asset or, in the converse case, for the purchase of an equivalent asset.” The recent Court of Appeal decision in POP Holdings Pte Ltd v Teo Ban Lim and others clarified that the breach-date rule reflects the law of mitigation i.e. damages are assessed on the assumption that the claimant would acquire substitute performance at the breach date, regardless of actual conduct.

The Court explicitly declined to adopt the “New York Rule” (used in Diamond Fortress Technologies Inc v EverID Inc), which measures damages by the highest intermediate value within a reasonable time after the breach. The Judge noted this gives claimants the “benefit of perfect hindsight” and risks an unfair windfall.

Drawing on Chitty on Contracts and Treitel on Contract Law, the court opined that the valuation date depends on two assumptions: (i) the claimant’s knowledge of breach, and (ii) the possibility and reasonableness of mitigation. Where these assumptions are falsified, courts depart from the breach-date principle.

Applying this to the facts, the court found:

• Knowledge: The Claimants discovered their inability to access funds on 12 July 2018.
• Reasonableness of Immediate Mitigation: It was not reasonable to expect them to mitigate on the date of breach itself, as the platform administrators initially described the issue as a temporary “technical” problem, leading the Claimants to reasonably believe normal service would resume.

Time for Mitigation: By around October or November 2018, the situation had changed. The platform was no longer accessible at its main URL, and rumours of closure were circulating. At this point, it became reasonable for the Claimants to mitigate their losses. They could have, for example, made formal demands for the return of their assets or commenced legal action. The court explicitly rejected the Claimants’ argument that they had no means to mitigate, stating that mitigation did not require them to purchase identical assets on an alternative market but could have involved taking reasonable steps to enforce their rights.

3. The Valuation Issue

The Claimants provided aggregated values of the digital tokens and monies based on historical data from cryptocurrency aggregators CoinMarketCap and CoinGecko. The Defendant’s expert attempted to challenge the figures but conceded in cross-examination that CoinMarketCap was a reliable source. The court accepted the Claimants’ valuation methodology as credible.

As the Claimants had not provided specific values for October-November 2018, the court adopted a pragmatic approach. It calculated the damages by taking the average of three values: the value on the breach date (12 July 2018), the highest value within three months after the breach (used as a proxy for the value in October), and the value on 1 December 2018. This resulted in a final assessed sum of US$10,126,158.43.

Conclusion

Kalen, Alexandru v World Exchange Services Pte Ltd establishes a distinctive Singapore approach to valuation date that rejects both rigid breach-date formalism and the US “highest intermediate value” windfall approach. By tethering valuation date directly to the doctrine of mitigation, it confirms that the valuation date is not fixed but is determined by when a reasonable claimant could and should have taken steps to mitigate their loss.

For the cryptocurrency industry and legal practitioners, this decision underscores the importance of prompt action upon discovering platform failures and the limited utility of “continuing breach” arguments where mitigation duties are neglected. The final award of approximately US$10.1 million, substantially below the claimants’ sought figure of over US$46 million; this demonstrates the financial consequences of delayed mitigation in volatile digital asset markets.