Stablecoin Liquidity Hits $270B, BIS Finds Inflows Depress T-Bill Yields Up to 10 bps
New BIS research quantifies how stablecoin inflows compress short-end Treasury yields, while TRM data shows stablecoins dominate illicit flows. The findings tie crypto liquidity to macro plumbing.
Stablecoins are no longer just for moving money on blockchains. They now affect short-term U.S. Treasury markets. The Bank for International Settlements (BIS) says all USD-backed stablecoins together are worth about $270 billion as of March 2026. USDT and USDC make up about $184 billion and $80 billion of that total [^claim_574]. At this size, stablecoin flows can change Treasury yields.
The BIS paper finds that a $3.5 billion stablecoin inflow lowers 3-month Treasury bill yields by 0.71 basis points right away. Within 10 days, the drop can reach 4 basis points. The lowest point is about 5 basis points at 13 days [^claim_575]. When Treasury markets are under stress, the effect grows to between 8 and 10 basis points. That is about twice the normal effect [^claim_576]. For crypto traders, here is how it works: When stablecoin reserves buy T-bills, it pushes down the risk-free rate. This lowers the cost of holding dollar-based crypto assets. A lower T-bill yield makes on-chain yield protocols more attractive. This can send money into DeFi.
Concentration makes the system more fragile. The BIS reports that one stablecoin-chain pair makes up about one third of total market value. The top three pairs together make up about 80%. The top ten pairs make up about 95% [^claim_577]. This means a shock to USDT on Ethereum or USDC on Solana can spread through the whole stablecoin system. It affects liquidity on exchanges, lending protocols, and derivatives markets. If the top pair faces a redemption event or new rules, the effects on T-bill yields and on-chain dollar supply would be very large.
Stablecoins are still the main way for illegal money to move. TRM reports that illegal crypto volume hit an all-time high of $158 billion in 2025. That is up nearly 145% from 2024. But illegal activity as a share of total on-chain volume fell to 1.2% [^claim_578]. In 2025, illegal groups received 2.7% of all flows from VASPs. That is down from 2.9% in 2024 and 6.0% in 2023 [^claim_579]. Nearly 95% of money going to sanctioned groups and places in 2025 used stablecoins. Russia’s A7A5 and Tether (USDT) made up most of that [^claim_580]. For compliance teams and protocol builders, this concentration means stablecoin issuers and their main blockchains are the key points to stop sanctions violations.
The main point: stablecoin liquidity now drives short-term Treasury yields. The sector’s concentration makes it both fast and fragile. For Bitcoin and Ethereum, price discovery now depends more on ETF flows and stablecoin reserve changes than on native leverage cycles. Watch for any new rules targeting the top stablecoin-chain pair. It would affect both crypto markets and Treasury yields at the same time.
Provenance ledger
7 claims web-citedEvery claim below cites a source URL, and each URL was checked for validity before publish. The excerpt shown is the researcher's own summary of the page — it is not re-derived from the source, so it is not a verified verbatim quote. Follow the link to confirm any claim against the original. Citation markers in the text jump here.
[1] As of March 31, 2026, aggregate USD-backed stablecoin market capitalization was roughly $270B, with USDT and USDC accounting for approximately $184B and $80B respectively. web-cited
“aggregate stablecoin market capitalization of roughly $270B as of March 2026” and “USDT and USDC account for approximately $184B and $80B respectively.”
This excerpt was not re-derived from the source page, and may paraphrase or condense it. Check the source before relying on it.
[2] The BIS paper finds that a $3.5B stablecoin inflow lowers 3-month Treasury bill yields by 0.71 basis points on impact and up to 4 basis points within 10 days, with the trough around 5 basis points at 13 days. web-cited
“a $3.5 billion (2-standard deviation) inflow lowers 3-month Treasury bill yields by 0.71 basis points on impact, and up to 4 basis points within 10 days” and later “the trough of roughly 5 basis points reached at 13 days.”
This excerpt was not re-derived from the source page, and may paraphrase or condense it. Check the source before relying on it.
[3] The same BIS study finds the stablecoin-to-Treasury yield effect deepens to 8 to 10 basis points when Treasury markets are under intermediary stress. web-cited
“In these states, the impact of a $3.5B inflow deepens to between 8 and 10 basis points, roughly double the baseline.”
This excerpt was not re-derived from the source page, and may paraphrase or condense it. Check the source before relying on it.
[4] The BIS paper reports that the stablecoin sector is highly concentrated: one stablecoin-chain pair accounts for roughly one third of market cap, the top three pairs account for around 80%, and the top ten account for around 95%. web-cited
“a single pair accounts for roughly one third of aggregate market capitalization; the top three pairs together account for around 80%; and the top ten account for around 95%.”
This excerpt was not re-derived from the source page, and may paraphrase or condense it. Check the source before relying on it.
[5] TRM reports illicit crypto volume reached an all-time high of USD 158 billion in 2025, up nearly 145% from 2024, while illicit activity as a share of total attributed on-chain volume fell to 1.2%. web-cited
“Illicit crypto volume reached an all-time high of USD 158 billion in 2025, up nearly 145% from 2024” and “illicit activity fell slightly to 1.2% in 2025 from 1.3% in 2024.”
This excerpt was not re-derived from the source page, and may paraphrase or condense it. Check the source before relying on it.
[6] TRM says illicit entities received 2.7% of incoming VASP flows in 2025, down from 2.9% in 2024 and 6.0% in 2023. web-cited
“illicit entities received 2.7% of incoming VASP flows in 2025, compared with 2.9% in 2024 and 6.0% in 2023.”
This excerpt was not re-derived from the source page, and may paraphrase or condense it. Check the source before relying on it.
[7] TRM reports nearly 95% of inflows to sanctioned entities and jurisdictions in 2025 were through stablecoins, with Russia’s A7A5 and Tether (USDT) making up the majority. web-cited
“Nearly 95% of inflows to sanctioned entities and jurisdictions in 2025 were through stablecoins. Russia’s A7A5 and Tether (USDT) made up the majority of these inflows.”
This excerpt was not re-derived from the source page, and may paraphrase or condense it. Check the source before relying on it.