A stablecoin is a digital asset designed to keep its value close to a specified reference, commonly a fiat currency. The target is called its peg. For a quant desk, a USD-referenced stablecoin used as trading cash or collateral still needs its own risk assessment: a token balance is not automatically an equivalent amount of spendable bank dollars.
The word describes a stability objective. It does not establish that the objective will always be met, what assets support it, or who can redeem. Designs include reserve-backed arrangements and algorithmic or protocol-based approaches. This article's balance-sheet example concerns an issuer with an explicit cash-redemption promise; it does not describe every stablecoin mechanism. HMRC's background discussion distinguishes these structures and their differing holder rights.
Separate the target, the assets and the exit
| Question | What to identify |
|---|---|
| What is the peg? | The reference asset or currency and target amount per token. |
| What is the market price? | The executable price on a particular venue, at a particular time, in a stated quote currency. |
| What provides backing? | Reserve composition, valuation, liquidity, custody and segregation. |
| What can this holder redeem? | The party obliged to pay, eligibility, fees, timing, restrictions and applicable terms. |
A secondary-market sale transfers tokens to another buyer. Redemption instead exercises a right under the arrangement to exchange tokens for the specified asset or payment. Access to one route does not establish access to the other.
For an eligible participant, buying below the redemption amount and redeeming can create an arbitrage incentive to support the peg. That incentive depends on executable prices, reliable payment, access and costs. A target alone is insufficient to infer a riskless trade. The BIS's stablecoin study highlights the difficulty of maintaining parity and the importance of reserve management and redemption rights.
A concrete terms check matters. Circle's non-EEA USDC Terms, dated 15 October 2026, distinguish holders with a Circle Mint account from those without one. Direct redemption requires an eligible account in good standing and remains subject to the terms, applicable law and relevant restrictions. Those terms are an issuer-specific example, not a universal right attached to the label “stablecoin”. Read the applicable USDC terms.
A reserve shortfall is not a price quote
Consider a fictional issuer that explicitly promises USD 1 redemption for each of 100 tokens. The aggregate promised payment is USD 100. Stipulate that its entire asset base consists of USD 95 of immediately accessible cash. There are no other liabilities, and no capital injection or other funding is available.
Original fictional reserve ledger. Amounts are USD; bar lengths share a common scale. The reserve is stipulated to be immediately accessible cash. This is not evidence about any actual issuer.
The reserve covers 95% of the promised payments. Dividing it by the token count gives USD 0.95 per token, but that is a reserve arithmetic result. It is neither an observed market price nor a guaranteed recovery: payment priority, enforcement, costs and any later resources would matter in an actual failure.
Here the problem is an economic shortfall against the stated promise. A different issuer could have sufficient assets in value but be unable to turn them into cash when redemptions arrive: that is a liquidity risk. Selling assets under pressure can then create losses. Distinguish how much the reserve is worth from how quickly it can fund payments.
Stability has several dependencies
Reserve quality and enforceable redemption terms address different parts of the problem. So do operational continuity and custody: a holder using an exchange or custodian also depends on that provider's ability to make the tokens available for transfer or redemption. The cryptocurrency custody discussion explains the difference between controlling tokens and holding an intermediary's account claim.
The FSB's recommendations for global stablecoin arrangements call for disclosures, effective risk management, robust legal claims and timely redemption. These are recommendations to authorities; they do not establish that every circulating token already meets those standards. Check the actual arrangement and jurisdiction before treating a stablecoin as cash in a valuation, collateral policy or settlement process. FSB recommendations 5, 8 and 9.
Sources
- HM Revenue & Customs, “Taxation of stablecoins”, updated 13 July 2026, introduction and background. Used for structures and redemption distinctions, not tax guidance.
- BIS Financial Stability Institute, “Stablecoins: regulatory responses to their promise of stability”, FSI Insights 57, 9 April 2024; publication summary on parity, reserve management and redemption rights.
- Circle, USDC Terms, updated 15 October 2026, outside-EEA scope and §2. Issuer-specific terms; other products and jurisdictions differ.
- Financial Stability Board, global stablecoin recommendations, 17 July 2023, recommendations 5, 8 and 9. Official pages checked 28 October 2026.