The stablecoin market set another supply record in the first week of September, and the headline wrote itself: more dollars sitting on chain than ever before. Circle's USDC did most of the growing, adding about $584 million in the seven days to September 6 after an August week that pulled in roughly $1.5 billion. Tether still sits on top. USDT circulates around $184 billion, close to 60 percent of all stablecoin supply, while USDC holds near $75 billion, about 24 percent. Trackers put the combined total somewhere between $301 billion and $322 billion, depending on what each one counts.
That ranking is the one every tracker shows and every recap repeats. It measures the wrong thing.
Stablecoin supply tells you how many dollars have been minted and parked somewhere. It says almost nothing about how many of them actually move. And once you look at the stablecoin dollars that move, the leaderboard turns over.
What the adjusted figure removes
Visa runs an on-chain analytics dashboard with Allium Labs that tries to separate real payment activity from noise. Their adjusted number strips out bot-driven transfers, exchange treasuries shuffling balances between their own wallets, and the same dollars looping through smart contracts again and again. The distance between raw and adjusted is large. In one measured month the two firms logged $3.9 trillion in raw transfers and cut it to $817.5 billion once the machine traffic came out, a reduction near 80 percent. A separate read on the first quarter of 2026 put bot-driven flows at roughly three quarters of all raw stablecoin volume.
So the number worth watching is not headline volume. It is adjusted volume, the slice that looks like people and businesses paying each other rather than scripts churning liquidity.
USDC moves two thirds of the real dollars
In June, Visa and Allium recorded $1.79 trillion in adjusted stablecoin volume, up 63 percent from May and 125 percent from a year earlier, with $10.2 trillion running across the trailing twelve months. USDC carried $1.21 trillion of that, about 67 percent. USDT carried $576 billion, roughly 32 percent. A token with a quarter of the supply settled close to twice the real volume of the token holding three fifths of it.
This was not a one-month quirk. Coinliva walked through the same pattern when the June record first printed, the month USDC turned over sixteen times its own supply. Circle's dollar first passed Tether's on adjusted volume back in early 2025, and it has held the lead every month since. Rewind to 2020 and the picture inverts completely: USDT handled nearly 90 percent of adjusted volume, USDC less than ten.
The chains underneath explain some of it. Base handled about $565 billion in June, roughly 31.5 percent of the adjusted total, with Ethereum a step behind at $562 billion. Tron, long the home of USDT, came third near $320 billion. USDC lives on the rails where trading desks, fintechs and on-chain funds settle. USDT lives where people hold savings.
| Metric | USDT | USDC |
|---|---|---|
| Supply, early September | ~$184B | ~$75B |
| Share of supply | ~60% | ~24% |
| Adjusted volume, June | $576B | $1.21T |
| Share of adjusted volume | ~32% | ~67% |
Two dollars doing two jobs
Put side by side, the supply and volume figures describe two stablecoin products wearing the same peg. USDC behaves like a settlement rail: high turnover against a smaller float, the kind of balance a company moves and refills rather than leaves parked. USDT behaves like a store of value, an outsized float that mostly sits still, leaned on as a stablecoin dollar substitute in markets where the actual dollar is hard to reach. Some analysts have taken to calling USDC the interbank dollar of crypto finance and USDT the offshore dollar of everywhere else. The framing is neat, maybe too neat, but the data beneath it holds.
The float is not idle in the accounting sense either. Both issuers keep most of their reserves in short-term US government debt, enough that policymakers now count stablecoin issuers among the buyers of Treasury bills, a shift Coinliva looked at when Washington started saying so out loud. A bigger USDT float is a bigger bid for T-bills, whatever it does for on-chain payments.
It also puts Tether's shrinking share of supply in context. That slice has been drifting lower for months, a trend Coinliva tracked back when the total first crossed $321 billion. On the settlement metric the contest was effectively over long before that. For anyone weighing which of the two to actually hold, the split is the point: the quiet store and the busy rail are not the same token, and they are not answering the same question.
Where the gap goes from here
The next monthly print from Visa will show whether USDC widened its settlement lead through the summer, and the early September supply figures suggest Circle is now gaining on Tether's float as well as its flow. The number to watch is the spread between the two stablecoin rankings. For most of 2026 the supply side and the volume side have pointed in different directions, and the one that keeps getting quoted in the headline is the side that moves the least.