Binance announced on September 5, 2022 that it would automatically convert customers’ existing balances and new deposits of USD Coin (USDC), Pax Dollar (USDP) and TrueUSD (TUSD) into Binance USD (BUSD) at a 1:1 ratio. The exchange scheduled the account conversion for September 29 at 03:00 UTC and said the consolidated BUSD balance would represent all four stablecoins on its platform.
The decision mattered because Binance was using exchange design—not a change to any token’s underlying blockchain—to concentrate dollar-stablecoin liquidity around BUSD. It affected which quote assets traders could use, how balances would be displayed and which stablecoin would sit at the center of one of crypto’s largest marketplaces. On September 5, the conversion was a plan, not a completed transfer.
What Binance said would change
Binance said customers would still be able to withdraw USDC, USDP or TUSD at a 1:1 ratio against their BUSD-denominated balance after auto-conversion. That distinction is important: the announcement did not say the three tokens would cease to exist, lose external transferability or stop being redeemable through their issuers. It changed their treatment inside Binance’s account and trading system.
The exchange also published a staged shutdown. It scheduled six spot pairs—USDC/BUSD, USDC/USDT, USDP/BUSD, USDP/USDT, TUSD/BUSD and TUSD/USDT—to stop trading on September 26 at 03:00 UTC. A larger group, including BTC/USDC, ETH/USDC and SOL/USDC, was scheduled to end when auto-conversion began on September 29. Pending orders were to be removed after each pair closed.
The policy extended beyond spot markets. Binance scheduled limits or closures affecting USDC futures margin deposits, margin lending and trading, flexible savings, DeFi staking, a liquid-swap pool and crypto loans on dates between September 7 and September 29. Those product changes made the announcement broader than a simple wallet-label adjustment.
Liquidity efficiency with a competitive edge
Binance’s stated rationale was to improve liquidity and capital efficiency. Consolidating order books can reduce fragmentation: instead of dividing bids and offers among several dollar-linked quote assets, an exchange can route activity through one common balance. That benefit was plausible, but it was an exchange claim on September 5; Binance supplied no execution-quality study, spread comparison or customer-savings estimate with the notice.
The same structure also favored BUSD over rival stablecoins. Customers retained a withdrawal route, but most would no longer hold separate USDC, USDP or TUSD balances or trade the affected pairs directly on Binance. The policy therefore combined an operational liquidity decision with a competitive distribution decision. It did not establish that BUSD was safer, more liquid across the entire market or economically superior to the other tokens.
Contemporaneous market context illustrates the asymmetry. TechCrunch reported at 11:46 p.m. PDT on September 5, citing CoinMarketCap, that USDC’s market capitalization exceeded $50 billion while BUSD’s was $19.3 billion. Those are publisher-reported global snapshots, not independently reconstructed Coinburn observations, and they do not measure the balances Binance would convert. No conversion total was disclosed on September 5.
What remained uncertain
The announcement did not quantify affected customer holdings, expected redemptions, order-book depth or the amount of BUSD that might be issued. It also did not prove that concentrating pairs would improve realized trading costs. Binance’s page says it was updated on September 6 to clarify parts of the process, so the September 5 record should be limited to the core conversion, withdrawal option and announced timetable.
Later documented context
A Circle-linked Form S-4/A filed with the U.S. Securities and Exchange Commission on November 14, 2022 later estimated that the conversion accounted for up to $3.0 billion of an $8.3 billion decline in USDC circulation between June 30 and September 30. Circle based that estimate on an approximately $3.0 billion increase in BUSD from August 17 through September 30 and explicitly said the contribution was difficult to determine. That later estimate helps measure possible scale; it was not knowable on September 5 and should not be treated as an event-day fact.
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