Warren, the Ranking Member of the Senate Banking Committee, gave Meta until May 20 to respond. Her letter cited concerns across financial stability, illicit finance, consumer protection, competition, privacy, and payments system integrity. The move comes just eight days after Meta quietly launched a pilot program on April 29 allowing select creators in Colombia and the Philippines to receive payouts in USDC, the dollar-pegged stablecoin issued by Circle, settled across the Solana and Polygon blockchain networks.

"Any attempt to control, influence, or preference a stablecoin on Meta's platforms, even a stablecoin issued by a third party [commas substituted for dashes in original], could have serious implications for competition, privacy, the integrity of our payments system, and financial stability," Warren wrote. She added that it is "critical that Meta be transparent with Congress and the public regarding its stablecoin-related plans," framing her inquiry as essential input before Congress finalizes any cryptocurrency market structure legislation.

What Meta Is Actually Doing

The current program is narrower than it might appear. Meta is not issuing its own coin. Instead, it is routing Circle's USDC through Stripe, which acquired stablecoin infrastructure startup Bridge, to settle creator earnings on-chain. Creators must connect a compatible third-party crypto wallet and choose between receiving funds on Solana, which currently holds roughly $14 billion in stablecoin supply across the network, or Polygon, whose native token POL carries a market cap of approximately $1.05 billion. Both chains were selected for their low transaction fees and high throughput, qualities that matter most for small, frequent payments in markets where banking infrastructure is limited.

Meta has explicitly stated it will not offer conversion of USDC into local currencies. That decision places the off-ramp burden entirely on the creator. USDC's total circulating supply sits near $78 billion, and the infrastructure to convert it back into Colombian pesos, Philippine pesos, or other local currencies remains limited across many emerging markets.

Marc Boiron, CEO of Polygon Labs, confirmed in a Polygon Labs blog post that the program is expected to reach more than 160 countries by end of 2026. Polygon deployed its v2 7.0 network upgrade on the same day Meta went live with the pilot. Meta's move is part of a broader post-GENIUS Act industry shift: companies including Shopify, Western Union, and DoorDash have also begun integrating stablecoin payment infrastructure into their platforms.

The Libra Ghost

Warren's letter lands in a context that Meta would prefer to leave behind. In 2019, the company announced Libra, a proposed multi-currency stablecoin backed by a fiat basket and supported by a consortium that included Visa, Mastercard, PayPal, Stripe, and eBay. A swift bipartisan backlash in Congress forced most partners to exit within months. The House Financial Services Committee, led by Representative Maxine Waters, explicitly called for a moratorium on the project. It was rebranded as Diem in 2020 and cut back to a single dollar-backed coin before being shut down entirely in January 2022. Its assets were sold to Silvergate Capital for approximately $200 million. Stuart Levey, the former Diem CEO, said the project could not move ahead due to the company's dialogue with federal regulators. Some former executives were more blunt, describing it as a "100% political kill."

What changed is the regulatory environment. The Guiding and Establishing National Innovation for U.S. Stablecoins Act, known as the GENIUS Act, was signed into law on July 18, 2025, establishing the first federal framework for payment stablecoins in the United States. Warren has raised concerns that provisions allowing large technology companies to access stablecoins through a certification review committee create a loophole that sidesteps adequate oversight, and she linked her current inquiry to ongoing legislative deliberations. Separately, the CLARITY Act, introduced in May 2026, was proposed specifically to close a related yield loophole in the GENIUS Act, reflecting how actively Congress is still refining the regulatory boundaries around stablecoins.

The Stakes Outside Washington

The political story in Washington is only part of the picture. Meta's platforms, particularly WhatsApp, are primary communication tools for hundreds of millions of users across South Asia and sub-Saharan Africa. WhatsApp alone has over 500 million active users in India, where it is already integrated with the country's UPI digital payments network. A stablecoin payout layer running alongside that infrastructure would operate under an entirely different regulatory structure, one that India's central bank has historically viewed with caution.

The gap is even sharper across parts of Africa. Remittance corridors such as South Africa to Zimbabwe or Nigeria to the United Kingdom carry fees that routinely exceed 8 to 10 percent. Proponents argue that a USDC payout channel delivered through WhatsApp could undercut those costs significantly. However, Meta's refusal to handle local currency conversion means users would still need access to reliable off-ramp services, a category that remains underdeveloped or expensive across many of the same markets.

Developers building wallet and payments infrastructure on Solana and Polygon in these regions are now operating on networks likely to carry significant Meta-routed volume before the end of the year. That scale is an opportunity for on-ramp and off-ramp providers, but it also concentrates liquidity flows in ways that could disadvantage local stablecoin projects building around currencies like the Kenyan Shilling or Nigerian Naira.

Warren's May 20 deadline will provide the next public signal of how much Meta is willing to disclose. If the company responds substantively, the answer could clarify both the pace of the global expansion and how it intends to handle the regulatory variation it will face across more than 160 jurisdictions.