U.S. Senator Elizabeth Warren has sent a letter to Meta CEO Mark Zuckerberg demanding detailed answers about the company’s reported stablecoin trials. The request, dated May 8, 2026, comes amid growing regulatory attention on stablecoins and revives memories of Meta’s failed Libra (later Diem) project.
Warren’s seven-point inquiry covers the type of stablecoin being piloted, the timeline for a potential public launch in the second half of 2026, any planned modifications to the Meta Pay platform, contractual agreements with third-party issuers, and safeguards for user privacy. She also seeks clarity on measures to prevent money laundering and illicit finance, and whether Meta would earn transaction fees. The senator set a deadline of May 20 for the response.
The letter highlights concerns that Meta’s 3.5 billion daily users could give any integrated stablecoin massive market reach, potentially influencing financial stability. Warren argued that Congress needs complete information before new crypto rules are finalized, and warned that Meta could sway which stablecoin gains adoption. She further linked the privacy risks to Meta’s advertising business, noting that stablecoin transaction data could deepen existing worries about how the company handles user information.
Warren also referenced Meta’s 2019 Libra project, which faced intense political and regulatory pushback before collapsing. The current stablecoin trials, while more limited in scope, have raised similar systemic risk and consumer protection alerts. Stablecoin adoption has surged, with dollar-pegged supply exceeding $303 billion, led by Tether’s USDT and Circle’s USDC. This growth has already drawn lawmakers’ attention, and Meta’s potential entry adds urgency to policy debates around the Lummis-Gillibrand Responsible Financial Innovation Act and other federal frameworks.
Meta has not publicly commented on the letter, but its past cryptocurrency setbacks suggest a cautious approach. The outcome of this exchange could shape both the company’s stablecoin roadmap and the broader U.S. regulatory landscape for digital currencies.
