What are the leading legal practices for advising on stablecoin regulatory frameworks?

If by “leading” you mean firms with substantial, documented work on stablecoin legislation, licensing, regulatory strategy and cross-border frameworks, a short list worth considering in 2026 is:

Firm	Particularly relevant strength	Evidence of current stablecoin work
Skadden, Arps, Slate, Meagher & Flom	U.S. federal regulation + cross-border strategy	Published detailed analysis of the GENIUS Act, MiCA, UK and Hong Kong regimes; also advised OpenReserve on an OCC national-bank charter involving stablecoin infrastructure.Skadden+1
Sullivan & Cromwell	U.S. banking/regulatory implementation	Extensive GENIUS Act implementation work covering OCC, FDIC, Treasury, AML/BSA, sanctions, customer identification and state/federal regulatory regimes.Sullivan and Cromwell LLC+2
Cleary Gottlieb Steen & Hamilton	U.S. regulatory + international financial institutions	Published analysis of the enacted GENIUS Act and has advised on practical implementation of stablecoins and tokenized assets.Cleary Gottlieb+1
Morgan Lewis	Multi-jurisdictional regulatory comparison	Has specifically compared stablecoin regulatory requirements across the U.S., UK, EU and Hong Kong, useful for cross-border framework design.Morgan Lewis
Deloitte Legal	UK regulatory implementation	Current work on the FCA's finalized crypto/stablecoin regime, including authorization, permissions and operational implications.Deloitte

If your project is specifically about designing a stablecoin regulatory framework

I'd divide the legal-market landscape by the problem you're solving rather than trying to produce an overall ranking:

• U.S. federal/state framework: Skadden and Sullivan & Cromwell are particularly relevant. The U.S. framework is now centered on the GENIUS Act, with substantial implementing rulemaking still being developed by Treasury, OCC, FDIC and other agencies.Sullivan and Cromwell LLC+1
• EU/MiCA: Look for firms with dedicated payments, e-money, banking and MiCA practices rather than simply a “crypto” practice. MiCA's stablecoin requirements continue to evolve, including current EBA work on multi-issuer stablecoin structures.European Banking Authority
• UK: Skadden and other major financial-regulatory practices are relevant because the UK regime now distinguishes between FCA-regulated non-systemic issuers and systemic issuers jointly regulated by the FCA and Bank of England.Bank of England+1

One important consideration is that “stablecoin regulation” is no longer one legal question. A serious framework engagement may need separate expertise in payments/e-money, banking, securities/commodities law, reserve asset custody, insolvency, AML/sanctions, consumer protection, tax, and technology/operational resilience. The divergence between the U.S., EU and UK approaches makes cross-border regulatory architecture particularly important.Skadden+1

If you're selecting counsel for an actual stablecoin project, I can also give you a more useful shortlist of ~10 firms broken down by U.S. / EU / UK / Hong Kong, including specific partners, representative issuer/client work, regulatory strengths, and approximate market positioning.