The debate over whether to regulate crypto is over; the real test now is whether regulators in different countries can coordinate rules that actually work together across borders. Europe's Markets in Crypto-Assets Regulation (MiCA) finished its transitional period on July 1, 2026, the UK finalized its rulebook on June 30, the US celebrated one year of the GENIUS Act (Generating Equitable Necessities with Innovative and Unified Stablecoins Act), and the Securities and Exchange Commission (SEC) and Commodity Futures Trading Commission (CFTC) issued joint guidance in March 2026 classifying many digital assets as digital commodities. Yet having rules in place and having rules that work together are two very different things.

What Happened When MiCA's Transition Ended?

MiCA's end triggered a significant shakeout across Europe. Of the more than 1,200 firms previously operating under national frameworks, only around 244 secured authorization under the new unified rules. The UK's full regulatory regime goes live in October 2027, while in the US, perpetual futures were brought onshore in May 2026, the GENIUS Act takes effect in January 2027, and negotiators continue working to finalize and pass the CLARITY Act (Crypto-Asset Regulatory Clarity Act). The Transatlantic Taskforce for Markets of the Future recently issued a joint US-UK statement affirming stablecoins as an important vehicle for innovation in digital money and committing to develop clear, consistent regulatory pathways forward.

This marks a first for digital asset policy: two of the world's major financial jurisdictions are developing interoperable and convergent frameworks designed to enable digital asset-based finance. However, agreeing that something belongs inside the regulatory perimeter is not the same as building one that works across borders. Consider a stablecoin issued in the UK, held by a customer in the European Union, and used to settle a transaction with a US institution. The transaction may happen almost instantly, but the rules covering reserves, redemption, custody, reporting, and insolvency still sit across three separate systems.

Why Can't Different Countries Just Use the Same Rules?

Each jurisdiction built its framework for its own market, legal system, and political moment, producing serious rulebooks that are not designed to communicate with each other. Stablecoins illustrate this problem most sharply. Issuers face different rules on what counts as reserves, where those reserves are held, how quickly customers can redeem, and what happens if the issuer fails. These differences are manageable for a single-market issuer but become structural problems the moment a stablecoin crosses borders.

The goal should not be identical rules everywhere. Instead, regulators should aim to ensure different regimes offer broadly comparable protections and recognize regulated activity taking place elsewhere. The challenge is that networks moving tokenized assets are global, while the firms using them remain accountable to national regulators. The task is keeping that accountability without adding friction every time an asset crosses a border.

What Are the Real Costs of Getting This Wrong?

The consequences of regulatory fragmentation fall across three critical areas. For firms, compliance costs compound rapidly. Running separate legal, compliance, and reporting structures suppresses the ability to quickly scale and pushes businesses toward whichever market is easiest to navigate, including those with no regulatory frameworks in place. MiCA's compliance burden falls disproportionately on smaller firms, which face many of the same requirements as much larger exchanges.

For the financial system, fragmentation blurs the full picture. One regulator may oversee the issuer, another the reserves, another the platform. If regulators are not already working together, especially in a domestic capacity, let alone international interoperability, responding to a market failure or stress becomes significantly harder, with costs that can be immense. For economies, investment flows toward markets offering both regulatory clarity and access. The inability to bridge regulatory distinctions between markets will affect how capital moves and where it moves.

How to Build Working Cross-Border Crypto Regulation

The tools for interoperability already exist, and three concrete steps can happen now without new laws:

• Comparable Protections Framework: Governments need a clearer process for deciding when another jurisdiction's rules offer comparable protections. The GENIUS Act lets foreign stablecoin issuers operate in the US where the Treasury Department judges their home rules comparable. The UK and US should use the Transatlantic Taskforce to agree on what that comparison covers, including reserves, redemption, safeguarding, reporting, and financial crime controls, and bring other major markets into the discussion.
• Practical Regulatory Arrangements: Regulators need practical arrangements for supervising cross-border activity. Common definitions help, but are not enough. Authorities need clear channels for sharing information, coordinating enforcement, and deciding who leads if an issuer fails. The March 2026 joint SEC-CFTC guidance shows what interoperability looks like.
• Real-World Testing Environments: Start with what is already working. The UK's Digital Securities Sandbox should be the starting point for jointly supervised testing of cross-border activity. HSBC was the first firm approved to go live in the Sandbox this month, operating as a digital securities depository for bond issuance and settlement.

That kind of real-world proof of concept does more for confidence than any number of consultation papers. The question now is whether supervised activity can extend across borders, not just within them.

The competition of the past five years produced the frameworks now in place. Coordinating on frameworks that each country built independently and takes pride in is hard. The alternative is three serious, well-built systems that cannot work together and that serve no one. The pieces are there; global policymakers will need to connect them.