Sonic Labs launched USSD, its first network-native US dollar stablecoin, on March 9, 2026. The token is built on Frax Finance's frxUSD infrastructure and is backed 1:1 by short-duration U.S. dollar assets, including tokenized Treasury products, held at regulated custodians. Minting requires no account registration or identity verification, and the token is available across more than 10 blockchains from day one.

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Backing and Structure

USSD maintains a one-to-one peg with the U.S. dollar. Users can deposit a range of established stablecoins to mint it, including USDC, USDT, PayPal's PYUSD, Blast's USDB, and three tokenized Treasury products: BlackRock's BUIDL fund, Superstate's USTB, and WisdomTree's WTGXX government money market fund. The SEC approved WisdomTree's plan for 24/7 trading of the WTGXX fund in February 2026, just weeks before USSD's launch, underscoring its regulatory standing as an underlying reserve asset. The broader reserves consist of U.S. Treasuries and repurchase agreements held at regulated custodians that carry "extremely low" default risk ratings from independent reviewers, according to Chaos Labs' August 2025 assessment of the frxUSD infrastructure.

Frax Finance founder Sam Kazemian commented when frxUSD launched with BlackRock's BUIDL fund as its initial backing in January 2025: "By partnering with Securitize to access and leverage BlackRock's BUIDL Fund we are setting a new standard for stablecoins. frxUSD combines the transparency and programmability of blockchain technology with the trust and stability of BlackRock's prime treasury offerings."

Security audits were completed by Zellic, with the full report published publicly on GitHub. The contract is deployed at 0x000000000eccff26b795f73fb0a70d48da657fef on Sonic mainnet.

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GENIUS Act Alignment

The stablecoin's design aligns with the Guiding and Establishing National Innovation for US Stablecoins Act, signed into U.S. law on July 18, 2025 following a 68-to-30 Senate vote. The GENIUS Act requires issuers to maintain full reserve backing with liquid assets, publish monthly reserve disclosures, and satisfy anti-money laundering requirements. According to Sonic Labs, USSD meets these requirements through its frxUSD infrastructure. Kazemian helped shape that framework directly, advising Senator Cynthia Lummis, a co-sponsor of the bill, during its drafting phase.

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Where Sonic Stands Today

Sonic Labs, formerly the Fantom Foundation, relaunched its high-performance EVM chain (a blockchain compatible with Ethereum smart contracts) under the Sonic brand in late 2024. The network processes more than 10,000 transactions per second with sub-second finality and offers developers up to 90% of protocol fee revenue through its FeeM program.

Despite that technical profile, Sonic's total value locked (TVL, the sum of assets deposited across its DeFi protocols) has contracted sharply from a peak of roughly $1.2 to $1.3 billion in early 2025, with reported contributing factors including the end of a market-making agreement with Wintermute and broader token price declines. As of March 2026, TVL sits at approximately $34.5 million according to DefiLlama. The network's native S token trades at around $0.038. Before USSD, bridged USDC.e accounted for more than 87% of all stablecoin activity on the chain.

Sonic Labs framed the launch in practical terms: "The goal is straightforward: make stable liquidity on Sonic more predictable, more composable, and easier to move across chains, so DeFi and on-chain markets can scale on a stronger foundation."

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What This Means for Users Outside the United States

USSD's permissionless design has direct relevance for users in regions where dollar-denominated savings tools are in high demand but tightly restricted. South Asia and Sub-Saharan Africa are among the fastest-growing crypto adoption regions globally, according to Chainalysis. India ranks first and Pakistan third on the 2025 Global Crypto Adoption Index. Nigeria ranks sixth overall and third specifically in decentralized finance activity. Nigerian users alone processed roughly $22 billion in stablecoin transactions between July 2023 and June 2024, and Sub-Saharan Africa as a whole received over $30 billion in DeFi service value over the same period, positioning it as a global DeFi leader.

In Sub-Saharan Africa, the primary use cases driving stablecoin adoption are remittances and cross-border payments. Traditional wire transfer corridors typically charge 5 to 8 percent in fees; stablecoin rails cost a fraction of that. USSD's zero-fee minting model and multi-chain availability could lower that friction further, particularly for users already active on Ethereum-compatible networks.

Regional regulatory environments are also shifting. Nigeria's Investments and Securities Act 2025 brings stablecoins under SEC oversight, with reserve-backing and anti-money laundering mandates that USSD structurally satisfies, a development that improves institutional adoption prospects in one of the continent's largest markets. In Pakistan, the establishment of the Pakistan Crypto Council in March 2025 and the announcement of a dedicated virtual assets regulator, PVARA, signal a comparable move toward formal oversight and add relevance for a GENIUS-aligned stablecoin in a market that already ranks among the world's top three for crypto adoption.

One structural distinction separates USSD from USDC (issued by Circle) and USDT (issued by Tether): both of those issuers retain centralized authority to freeze or blacklist wallet addresses globally. USSD's on-chain minting is permissionless and requires no identity verification, a meaningful distinction for users seeking accessible dollar liquidity. The GENIUS Act does require compliant issuers to maintain the technical capability to freeze and burn tokens, however, so how that function is governed within USSD's architecture merits ongoing scrutiny.

Development economists at the Center for Global Development have raised a broader concern about USD-denominated stablecoins in emerging markets, arguing that widespread adoption can erode local monetary policy and fiscal capacity. USSD is not exempt from that critique.

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Looking Ahead

The tokenized U.S. Treasury market surpassed $7.3 billion in assets under management in 2025, a 256% year-over-year increase, with conservative projections pointing toward $14 billion by the end of 2026. ATW Partners committed $50 million to frxUSD in January 2026, with BitGo providing qualified custody, signaling continued institutional confidence in the infrastructure underlying USSD.

Developers building on top of USSD should note one risk flagged by Chaos Labs: redemption pathways are custodian-specific. Converting USSD back into standard stablecoins such as USDC may require multi-step routing depending on which reserve asset backs a given position. Projects designing treasury or collateral systems around the token need to model for that complexity.

Direct fiat redemption, which would allow users to withdraw U.S. dollars to a bank account, is planned for a future update and will require identity verification under AML regulations when it arrives.