US$2.6 Billion of a Circle Treasury Fund Sits on One Exchange's Chain — and That's How the Category Is Now Won

One of the largest tokenized Treasury funds in the market keeps almost none of its money on Ethereum. About US$2.5 billion of Circle's USYC — roughly 97% of the fund's on-chain supply — sits on BNB Chain, held as collateral inside Binance itself. On Ethereum, the chain the category was built on, it keeps about US$81 million, around 3%.

That distribution is the story, not the ranking. In March 2026 Circle overtook BlackRock as the largest issuer of tokenized Treasuries as the market crossed US$11 billion, and USYC has traded near the top of the single-fund rankings with BUIDL since. But it climbed there almost entirely on the strength of a single exchange integration — and that is a different kind of story than a fund simply getting bigger.

The deal that moved the money

In July 2025, Circle and Binance agreed to let Binance's institutional clients post USYC as off-exchange collateral for derivatives trades, with the token issued natively on BNB Chain and held through Binance's custody partners. The pitch was capital efficiency: a trader could hold a yield-bearing Treasury instead of an idle stablecoin behind a derivatives position, and swap it back into USDC in near-real time. For an institution running leverage, that is the difference between collateral that earns and collateral that sits.

The response shows up directly in the supply. USYC launched on BNB Chain in November 2025 at roughly US$1.07 billion and grew past US$1.8 billion within months, a rise CoinDesk tied specifically to the Binance collateral use. Today the BNB balance stands near US$2.5 billion. A fund that grew into one of the category's largest was, in effect, built inside an exchange.

Where the money actually is

Two details keep the figure honest. The balance is concentrated on a single chain, so it is not a broad reading spread across venues — it is one dominant position, and it has held that shape day over day. And the token is measured here at its US$1.00 peg; USYC's net asset value rebases higher, near US$1.13, which would lift the fund's total to roughly US$3.0 billion. The peg is the conservative floor. Neither adjustment touches the distribution — the money is on BNB Chain either way, and the distribution is the point.

Collateral, not custody

A balance this concentrated on one venue is not a broad market. It is a small number of large institutional positions posted behind trades, custodied through Binance's partners — closer to one desk's working capital than to thousands of holders. On Ethereum, a similar concentration would read as a warning. Here it is the mechanism: the reason US$2.6 billion moved to BNB is precisely that it is there to be used, not held. Treating it as evidence of retail migration would miss what it is.

That distinction is what makes USYC a leading indicator rather than an outlier. Tokenized Treasuries began as a way to hold cash on-chain; they are becoming the collateral layer underneath on-chain trading. A yield-bearing instrument that a venue accepts against positions is more useful than one that only sits in a wallet, and the venues with the most trading flow are the ones that can pull the most supply onto their chain. Distribution into a trading venue, in other words, is starting to matter more than the fund's pedigree.

What it means

BlackRock's BUIDL still carries the strongest name in asset management, and it has traded the category's top spot with USYC through the year. But USYC reached the top by a different route: not distribution through funds and advisors, but embedding into the collateral plumbing of the largest crypto exchange. The category's two leaders now represent two competing theories of how this market is won — one on the prospectus, one on the exchange.

If the exchange route keeps working, the question for every tokenized-Treasury issuer stops being which fund is most trusted and becomes which venues will accept it as collateral — and the chain a fund concentrates on becomes a map of where its distribution deals were signed, not where its investors happen to be. The next fund to move up the rankings will show which theory is winning. On the current evidence, the decisive variable isn't the logo on the fund. It's the venue behind it.