Executive summary
Stablecoin metrics are diverging. Total market cap has fallen about 4.3% from May's $322.41 billion peak to roughly $308.5 billion, including a $7.7 billion June contraction — the sharpest monthly drop since Terra's 2022 collapse. Adjusted transaction volume, meanwhile, hit $1.79–$1.83 trillion in June, up 60–63% month-on-month and more than double year-earlier levels.
USDC drove the surge, processing about $1.21 trillion of adjusted volume in June versus roughly $576 billion for USDT — even though USDT still holds the larger share of supply. The signal to track is shifting from static market cap toward velocity, payment routing, tokenized Treasury deployment, and settlement infrastructure.
The divergence
DefiLlama puts total stablecoin market cap near $308.3 billion, with USDT at $183.9 billion and USDC at $72.2 billion — down from May's peak. Visa's Allium-powered analytics recorded $1.79 trillion in adjusted stablecoin volume for June, up 63% from May's $1.1 trillion and 125% year-over-year. USDC accounted for about 67% of that adjusted activity ($1.21 trillion); USDT processed about $576 billion.
Supply fell while turnover rose. For institutional investors, the relevant metric is shifting from stablecoin count to usage intensity per dollar.
Less idle capital
Rising supply used to signal fresh capital entering crypto; falling supply, capital leaving. That reading is now incomplete. Stablecoins increasingly function as working capital, moving between exchanges, OTC desks, payment processors, DeFi venues, and tokenized Treasury funds — a smaller float can support higher settlement activity if velocity rises.
Standard Chartered's Geoffrey Kendrick noted in March that stablecoin velocity has roughly doubled over two years, with tokens now turning over about six times a month on average, partly driven by USDC's multi-chain activity and use cases beyond trading — payments, capital markets, early AI-driven transactions. A falling market cap doesn't necessarily mean falling demand; balances may be moving more efficiently, rotating between idle holdings and yield or settlement instruments.
Where the supply went: tokenized Treasuries
Tokenized U.S. Treasuries have grown from $6.51 billion in July 2025 to over $16 billion a year later, per rwa.xyz — a plausible destination for the missing stablecoin supply. The GENIUS Act reinforces the split: it bars permitted stablecoin issuers from paying yield directly to holders and requires one-to-one backing with cash, short-dated Treasuries, repo, or government money-market funds.
Stablecoins increasingly handle movement while tokenized Treasuries handle yield: operating balances sit in stablecoins, and savings balances are shifting into BUIDL, USDY, BENJI, USYC, and similar products.
Value capture is moving to velocity
Issuers still depend on market cap — reserve income scales with supply as long as rates stay positive. Networks, processors, wallets, and exchanges depend on throughput instead. A dollar that turns over 16 times a month is worth more to payment infrastructure than one sitting idle for six months, which is why USDC's outsized share of adjusted volume — on a smaller supply base — matters.
Issuers capture reserve income; blockchains capture fees; wallets and processors capture routing and FX spreads; exchanges capture trading flow; tokenization platforms capture custody and compliance fees. The investor question is shifting from "which stablecoin has the largest supply" to "which rail captures the highest-quality transaction flow."
Real payments are still a small slice
Not all on-chain volume is an economic payment — automated activity, exchange transfers, and trading loops inflate raw figures even after Visa's adjustment. McKinsey and Artemis estimate identifiable real-world stablecoin payments at about $390 billion in 2025, roughly 0.02% of global payments. B2B payments made up about $226 billion (60%) of that total. Stablecoin-linked card spending reached $4.5 billion, up 673% from 2024.
The strongest use cases remain early-stage but real: cross-border B2B payments, trading settlement, emerging-market dollar access, DeFi collateral, and merchant-card conversion.
What to watch in H2 2026
Stablecoin velocity, not just market cap
USDC's share of adjusted settlement, which signals whether institutional flows are consolidating onto compliance-forward rails
USDT's emerging-market and P2P role, where it remains the dominant dollar instrument
Tokenized Treasury AUM growth, confirming migration of idle cash rather than exit from on-chain finance
Exchange stablecoin reserves, where outflows can signal weaker trading liquidity or migration to self-custody and DeFi
Investment thesis
Market cap contraction alone is no longer a bearish signal. June's data shows supply falling while settlement activity hits records, tokenized Treasuries absorb idle cash, and USDC gains share of adjusted volume on a smaller float. Reserve income still matters for issuers, but the larger value pool sits with the processors, tokenization platforms, wallets, and chains converting stablecoin balances into repeat settlement flow. The rails combining fast settlement with a clear regulatory wrapper will capture the most durable share.
