Europe Showed Tether the Door at Coinbase and Let Another Dollar Walk In

Europeans who keep dollar stablecoins on Coinbase and do nothing before the end of this week will end up holding a different dollar. Coinbase’s USDT conversion starts after 30 October, when any Tether, PayPal USD, Dai or 11 other unlicensed stablecoins left in European retail accounts are swapped at market rates, in most cases into Circle’s USDC.

Stablecoins are crypto tokens designed to hold a fixed value, almost always one US dollar, and they are a common bridge between euros and crypto. The EU’s Markets in Crypto-Assets Regulation (MiCA) has taken one dollar off the shelf, and the product left in its place is another dollar.

What MiCA asks and what it leaves to the exchange

The pressure on Tether in Europe rose again when the European Securities and Markets Authority (ESMA) published an opinion that could end USDT custody on licensed EU platforms. MiCA lets a stablecoin be offered or traded on those platforms only if its issuer holds an EU licence, and according to Coinbase the transitional period for issuers closed on 1 July 2026 without an extension. Tether’s USDT has no such authorisation.

The opinion, dated 8 October, tells national supervisors that licensed platforms should stop serving non-compliant tokens and clear any leftover balances within three months, which sets the outer date at 8 January 2027. During that window, ESMA’s opinion lets supervisors allow platforms to liquidate, convert, transfer, withdraw or safekeep what customers still hold. It does not say which coin a conversion should end in.

Coinbase picked both the date and the destination. Its customer notice gives retail customers in the European Economic Area until 30 October to withdraw the 14 affected tokens to an external wallet, ten weeks before the regulator’s limit. Buying, selling and converting them on the exchange is already blocked, and whatever is still in the account after the deadline is converted into USDC.

Who earns from the default

USDC is backed by reserves held largely in short-term government debt and bank deposits, and those reserves earn interest. Coinbase and Circle split that income under a collaboration agreement signed in 2023, which Coinbase described in an SEC letter in November 2024. Circle first keeps a portion for issuing the coin, each company then receives income in proportion to the USDC held in its own custody products, and Coinbase takes half of whatever remains. Circle confirmed in August 2026 that the agreement had renewed on its existing terms.

A European balance converted into USDC and left on Coinbase therefore produces reserve income for Coinbase every day it sits there. The holder cannot be paid any of it, because MiCA’s interest ban stops both issuers and crypto service providers from granting interest on e-money tokens. Coinbase ended its USDC rewards programme for European customers in December 2024 as part of its MiCA compliance.

The United States wrote a comparable restriction into its stablecoin law, so the economics are not a European invention. The European difference is the deadline, and Coinbase has used it to move inactive customers into the coin it earns from.

Where the euro stands

The conversion lands on top of a move that was already under way. Data from Kaiko, a crypto market data provider, shows USDC handling 56% of trading between stablecoins and the euro, up from 10% in January 2024, with order books about 40% deeper than those of USDT. Euro-backed stablecoins account for less than 8% of euro trading volume on the same data.

The euro has been on the table before. Coinbase first restricted these tokens in 2024 and said at the time that it would help customers move into compliant coins such as USDC or EURC, Circle’s euro coin. This week’s notice converts leftover balances into the dollar coin, and the 37 banks behind a euro stablecoin called Qivalis received their e-money licence this month but have not issued a single token yet.

Europe does gain something concrete from the move. The European Banking Authority (EBA) classified USDC as the first significant e-money token in the EU on 14 October, and from 12 November it takes direct supervision of the coin’s reserves, liquidity and redemption plans. The dollar Europeans are being moved into will be supervised from Paris.

Where Europe did protect the euro

MiCA does look at currency in one place. Through Article 58, the payment cap written for asset-referenced tokens also applies to e-money tokens tied to a currency outside the EU, so a dollar coin used as a means of exchange for more than 1 million transactions and €200 million a day, on a quarterly average, within a single currency area has to stop being issued. The cap counts payments for goods and services, and trading or simply holding the coin sits outside it.

The stablecoin-to-euro market that Kaiko measures, and the balances Coinbase converts this week, belong to that second group. Britain, which sits outside MiCA, shows the same pull towards the dollar, with a sterling stablecoin market worth $1.53 million against a global total of $315 billion when the House of Lords examined it in June. Any fintech building on stablecoins in Europe now works with a licensed menu that, by value, is almost entirely dollars, with Circle’s USDC by far the largest.

The rules also leave a side door open. MiCA’s own recitals exclude crypto services provided in a fully decentralised manner without an intermediary, and ESMA’s opinion is addressed to platforms rather than private wallets. A customer who withdraws USDT to self-custody before 30 October keeps it, beyond the reach of the regulation that removed it from the exchange.

Europe drew its line for the dollar at the checkout, where a dollar coin used too widely for payments must stop growing, and drew no currency line at the exchange, where Europeans keep their crypto money. Coinbase’s conversion happens entirely at the exchange, so a rulebook written partly to defend the euro ends this week with Europeans still in dollars, now supervised by the EBA and earning income for the platform that picked them. Any region that copies MiCA inherits the same gap, along with the private wallets that sit outside it.

Editor’s note

Every piece goes through careful verification, but mistakes can happen. Readers who spot an error or have additional information can write to rosalia@thebrightminded.com.