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Why Central Banks Are Watching Stablecoin T-Bill Flows
June 26, 2026 at 08:01 PMBy AlphaScala Research DeskSource reporting: CryptoSlateEditorial standards
BIS data shows a $3.5B stablecoin inflow moves T-bill yields by up to 4 bps. That changes how traders read issuer reserves and central bank policy on tokenized dollars.
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Stablecoin issuers now buy and sell enough short-dated Treasuries for their flows to show up in the same yield curve the Fed uses to transmit policy. That is the practical reading of the Bank for International Settlements' June 23 Annual Economic Report and a companion working paper.
The BIS chapter on innovation beyond stablecoins starts with a basic test of money: singleness, liquidity elasticity, integrity. Private dollar tokens can move fast on public blockchains, the BIS acknowledges. They lack the institutional support–central bank settlement access, system-wide liquidity backstops–that makes bank deposits and central bank money function as no-questions-asked settlement assets under stress.
Adoption changes the policy question. A stablecoin used mostly as a crypto quote asset is one case. A stablecoin that becomes a large reserve-backed dollar instrument held across exchanges, wallets, and offshore markets is another. The issuer then decides where reserves sit, how redemptions work, and which assets it buys or sells as demand shifts.
The clearest number comes from the working paper on stablecoins and safe asset prices. The paper estimates that a $3.5 billion aggregate stablecoin inflow–roughly two standard deviations in its sample–lowers three-month Treasury bill yields by about 0.71 basis points on impact and up to 4 basis points within 10 days.
The paper calls the effect sample-specific. It uses daily data from January 2021 to March 2026, local projections, and an instrument designed to isolate shocks to stablecoin flows. The estimate is strongest in the maturity bucket where issuers are most likely to hold reserves, and the effect amplifies when Treasury-market intermediaries face stress or as the stablecoin sector grows.
Four basis points in a single short-rate instrument is small. It is also measurable. Stablecoin issuers have become large enough for their reserve allocation to register in the market used to price safe dollar liquidity.
A separate BIS paper on making stablecoins stable(r) adds the other side of the same mechanism. Large redemptions can force issuers to draw on cash buffers or sell short-dated bonds. The paper models how liquidity and capital thresholds reduce default and spillover risks when they function as usable buffers. It also shows that rigid rules can push issuers into bond sales too early during stress.
BIS research on stablecoin flows and FX markets extends the point beyond T-bills. Shocks to net stablecoin inflows can widen deviations from stablecoin-dollar parity, affect local currency values, and change short-term dollar funding premiums. The finding stops short of turning every transfer into a macro event. It explains why central banks are studying these flows as part of dollar and FX plumbing.
Market data from June 26 put Tether at about $186.08 billion in market cap with $84.95 billion in 24-hour volume. USDC stood at nearly $73.68 billion with $15.54 billion in volume. Together the two largest dollar-stablecoins represented roughly $259.76 billion in market value and more than $100 billion in daily trading volume. Their reserve portfolios concentrate in cash, repo, money funds, and short-duration government debt.