Coinbase said that Marex has gone live accepting USDC to meet initial margin requirements inside its regulated derivatives clearing business. Prime Trading executed the first transaction through the workflow, with Coinbase providing custody, 1:1 instant fiat-to-USDC conversion and custom daily reporting, making stablecoin collateral operational inside traditional clearing infrastructure.
The launch follows a December 2025 CFTC no-action letter that Coinbase said opened the door for futures commission merchants to accept stablecoins, bitcoin and ether as customer margin collateral. For derivatives users, the key operational change is timing: USDC can move outside banking hours, turning always-on collateral mobility into a regulated margin function.
Coinbase framed the Marex launch as an early proof point for infrastructure that combines custody, conversion, reporting and derivatives access in one platform. The next test is whether the model expands across more clearinghouses, asset classes and margin workflows, because stablecoin collateral now has to prove it can scale within supervised market plumbing.
Source: Coinbase.
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