Mercado Bitcoin to Support SUI and USDsui for 4.5 Million Customers

Mercado Bitcoin Adds SUI Support

Mercado Bitcoin (BTC), Brazil's largest digital-asset platform with roughly 4.5 million customers, announced a cooperation with the Sui blockchain on Thursday that will bring support for SUI, USDC and the network's native dollar stablecoin USDsui to its retail base. The agreement also covers plans to accept USDsui as collateral in the exchange's credit products and to migrate the company's tokenized real-world assets onto Sui infrastructure. Roberto Dagnoni, chairman of Mercado Bitcoin's board, said the partnership would let Brazilian investors reach the Sui ecosystem inside a regulated financial environment, with a link to the country's Pix instant-payment system part of the planned rollout.

The announcement arrived while the SUI price sits deep below former highs: the token traded near $0.85 to $0.95 as of Friday, down about 6.3% over the past 24 hours and roughly 83% under the $5.35 all-time high reached in January 2025. Distribution through a regulated retail platform of this scale is the market access Sui's backers have courted all year, and Pix, the rail most of Brazil uses for instant payments, gives the deal a payments dimension few exchange integrations carry. The scope is broader than a listing, too: collateralized lending and asset tokenization would put Mercado's balance sheet and product pipeline on Sui rails, not just its order book. For the network, a partner of this size brings recurring flows in the form of deposits, repayments and stablecoin transfers, each settling on-chain. Dagnoni framed regulated access as the core benefit for Brazilian investors, a market where crypto adoption has grown alongside a formal financial system.

The USDsui Rail Behind the Deal

The stablecoin at the center of the arrangement, USDsui, went live on Sui's mainnet on March 4, issued by Bridge, the stablecoin platform owned by payments company Stripe. Its Kraken listing on October 5 widened access, and the Mercado agreement now plans to put the asset to work as loan collateral, a step beyond custody or trading support. Sui's payment stack is built for that job: since May 2026 the network has supported stablecoin transfers without transaction fees on supported applications, so users can send USDC without buying SUI first.

The deal joins a string of access points built this year. Three SUI-linked exchange-traded products began trading in the United States between February 18 and February 24: Grayscale's GSUI on NYSE Arca, and Canary Capital's SUIS and 21Shares' TSUI on Nasdaq, some structured to capture staking yield. Samsung is preparing stablecoin transfers for 82 million eligible Galaxy devices in the United States, with USDC supported first and Solana installed alongside Sui in the infrastructure. Hashi, the program for using Bitcoin as collateral for on-chain financial services, carries more than $500 million in committed capital disclosed in Sui's October 8 announcement, with Anchorage Digital among the participants.

The financial footprint behind these launches remains modest. On-chain data puts the total value locked, or TVL, in DeFi applications on Sui near $450 million to $460 million as of Friday, against a peak above $2.08 billion on January 4, 2025, while the network's stablecoin market capitalization stands near $429 million. This altcoin has traveled far from its 2024 bull market, when the token climbed about 395% over the year from roughly $0.84 to $4.18. Stablecoin rails are proving their scale elsewhere, with Visa stablecoin settlement volumes already topping $25 billion annualized, a benchmark for what payment integrations can carry.

Supply Calendar Weighs on Token Demand

The agreement tests whether distribution converts into token demand, and this year's record argues for caution. Samsung's wallet supports USDC rather than SUI, and exchange support alone lets customers transact without ever buying the token. Supply adds its own weight: about 4.12 billion of SUI's 10 billion maximum supply is in circulation, roughly 41%, and a scheduled 13.15 million SUI unlock arrives on November 1. Storage-fund removals and buybacks financed from stablecoin reserves trim some issuance, though repurchased tokens can be redistributed rather than burned. Whether the Mercado deal moves the market will therefore show up in collateral balances inside its credit products and in settled USDC and USDsui volume through Brazil's Pix rails, not in the announcement itself; our Sui technical analysis page tracks the levels traders are watching in the meantime.