Stablecoins are no longer just a crypto market story in this new BIS working paper. The paper argues that USD-pegged stablecoins have already become part of a parallel foreign exchange system, and that shocks in stablecoin flows can spill into traditional FX markets by widening crypto-fiat price gaps, pushing local currencies weaker, and making synthetic dollar funding more expensive.
That is the real news angle. The paper does not treat stablecoins as a side channel around the edges of finance. It says they are now an emerging segment of global currency markets with direct implications for financial stability, especially where local FX markets are already under pressure. It is also worth noting that this is a BIS Working Paper written by BIS and IMF economists, so the findings are research-based and not a formal BIS policy standard.
Stablecoins are behaving like a parallel dollar market
The paper studies four USD-pegged stablecoins against 27 fiat currencies using daily data from 64 centralized exchanges between January 2021 and November 2025. Its starting point is simple: more than 70% of cumulative net inflows from fiat currencies into these stablecoins came from non-USD currencies, meaning most of this activity already embeds an FX conversion into dollars.
That leads to a bigger conclusion: stablecoin trading is creating a parallel, crypto-based FX ecosystem alongside traditional off-chain currency markets. The authors say this new venue differs from traditional FX in participant base, regulatory oversight and exposure to official intervention. In plain English, people are increasingly using stablecoins as an alternative route into dollars, not just as a crypto trading instrument.
The strongest finding is that stablecoin flows can move real currencies
The paper’s headline empirical result is that a 1% exogenous increase in net stablecoin inflows raises parity deviations by about 40 basis points, depreciates the local currency by 5 basis points, and widens the short-term dollar premium in synthetic funding markets by roughly 5 to 10 basis points.
Those numbers matter because the authors are not only showing correlation. They use a granular instrumental variable strategy to argue that the relationship is causal, not just the result of people rushing into stablecoins after a currency has already come under pressure. Their broader point is that stablecoin-based demand for dollars can spill into traditional FX pricing and funding conditions.
The paper also finds that price gaps between acquiring dollars through stablecoins and through the spot FX market are often substantial, sometimes averaging several percentage points for weaker currencies. These gaps are systematically larger in economies with macro instability, high inflation or capital flow management measures. That suggests crypto-based dollar access becomes more important precisely where traditional FX frictions are already high.
Where the pressure shows up first
The paper uses two ideas that matter for readers. The first is parity deviations — the gap between the cost of getting dollar exposure through stablecoins and through the regular FX market. The second is CIP deviations, which in simple terms reflect stress in synthetic dollar funding. When both move, the message is that stablecoin activity is not staying inside crypto. It is pushing into broader dollar pricing and funding conditions.
The authors estimate a spillover ratio of about 0.15, which they interpret as roughly one-sixth of stablecoin price pressure transmitting into synthetic dollar funding costs. They explicitly say this affects banks, corporates and sovereigns that rely on FX swaps, whether or not they participate in crypto markets themselves. That is one of the clearest reasons this paper matters beyond digital assets.
Stress conditions can make the effect much worse
The paper’s dynamic analysis says spillovers do not grow in a neat straight line. They become more dangerous when intermediaries are under stress. As capital is depleted, those intermediaries have less capacity to absorb shocks, which amplifies price moves and weakens market integration further.
The authors also say redemption frictions can sharply worsen the transmission channel in crisis episodes. In their simulations, when flow shocks coincide with redemption frictions and balance-sheet depletion, spillover effects can reach several multiples of the baseline. That means stablecoin-linked FX stress could matter much more in bad markets than in normal ones.
The policy signal is sharper than the title suggests
The paper points to two main policy directions. First, prudential requirements on stablecoin intermediaries — such as capital buffers, reserve liquidity mandates and limits on concentrated currency exposures — could reduce the spillover channel by lowering cross-market frictions and preserving risk-bearing capacity. Second, policymakers responsible for currency stability, especially in emerging markets, may need to bring stablecoin market monitoring into macroprudential surveillance.
There is also a more politically sensitive implication. In the conclusion, the authors explicitly say stablecoin flows may weaken the effectiveness of monetary policy and capital flow management measures in economies where they offer an alternative channel for cross-border capital movement. That is a strong conclusion for a BIS working paper, because it moves the discussion from crypto adoption into monetary sovereignty and policy effectiveness.
Why it matters for crypto
- It is one of the clearest research cases yet that stablecoins are affecting traditional FX markets, not just crypto trading venues.
- It strengthens the regulatory case for treating stablecoins as part of cross-border financial infrastructure, especially in emerging markets.
- It suggests future stablecoin oversight may focus more on market structure, intermediation capacity and reserve liquidity, not only on issuer disclosures. This is an analytical conclusion from the paper’s policy section.
- It also raises the stakes for stablecoin use in countries with weak currencies, inflation stress or capital controls, where crypto-based dollar access may already be functioning as an alternative FX channel.
What to watch next
- Whether central banks and market regulators start incorporating stablecoin flow metrics into FX and capital-flow surveillance frameworks. This is a forward-looking inference from the paper’s policy discussion.
- Whether policymakers in emerging markets move faster on reserve liquidity, intermediary capital or stablecoin on-ramp oversight after findings like these.
- Whether future BIS, IMF or central bank research tests the same spillover channel during sharper market stress or around specific stablecoin events. This is an inference from the paper’s crisis-amplification results and future research section.
- Whether the market starts pricing stablecoin growth less as a crypto adoption story and more as a macro-financial variable tied to dollar demand and FX fragmentation. This is an analytical conclusion based on the paper’s core findings.