AI search ranks USDC above USDT as trust and compliance rise

USDC has started winning the answer box on trust, and that matters as much as market share. In 5W AI Communications’ May 29 Stablecoin Trust Index, the token ranked first with a 95 trust score, while USDT, still the largest stablecoin by market capitalization, landed in the hedge tier and finished tenth.

The index is built to reflect how ChatGPT, Claude, Perplexity, Gemini and Google AI Overviews respond across more than 60 prompts, then sorts each answer into three stances: compliant, hedged or warned. That structure makes the result hard to miss: the engines are rewarding disclosure, reserve quality and regulatory alignment, not just scale. In practice, the answer layer now appears to be acting like an early regulator for crypto trust, translating the GENIUS Act into everyday language before most investors fully absorb what the law means.

That regulatory backdrop is already taking shape in Washington. The GENIUS Act was enacted on July 18, 2025, and the OCC said on February 25, 2026 that the law’s effective date is the earlier of 18 months after enactment or 120 days after final implementing regulations. The OCC also said its rulemaking will cover reserve assets, redemption, risk management, audits, supervision, custody and foreign issuer oversight, and that the law generally prohibits anyone other than a permitted payment stablecoin issuer from issuing a payment stablecoin in the United States.

Circle has been leaning into that framework. Its USDC materials say the token was established in 2018, is fully backed by dollar or cash-equivalent assets and is always redeemable 1:1 for U.S. dollars. Circle also says it publishes weekly reserve disclosures and monthly third-party assurance, with a Big Four accounting firm providing monthly confirmation that reserves exceed the amount of USDC in circulation. In July 2025, Circle said it already operated under state money transmitter licenses nationwide, was the first New York BitLicense holder and had applied to form First National Digital Currency Bank, N.A.

Tether’s pitch is more about scale and reserve reporting, but the transparency story is looser by comparison. Tether says reserve reports are published quarterly and are prepared by management, and its Q1 2026 attestation said excess reserves rose to $8.23 billion. Even with roughly $189 billion in USDT market cap inside a roughly $320 billion stablecoin market, 5W’s index says that size no longer buys automatic trust if the narrative is qualified on offshore structure or audit history.

That is the real shift. Brookings said in October 2025 that regulators still need to set capital, liquidity and risk-management requirements, and decide how foreign issuers fit under a comparable regulatory regime. Until those rules fully land, AI engines may keep doing the first pass on compliance, and for stablecoins that first pass now looks a lot like policy.