A New Standard for Clearing: Marex and Coinbase Bring USDC Into Regulated Margin Workflows

Marex has started accepting USD Coin (USDC) as initial margin collateral in its regulated derivatives clearing operations, with Prime Trading LLC completing the first trade under the new workflow. The setup is powered by Coinbase, which handles custody, around-the-clock 1:1 conversion between fiat and USDC, and daily reporting built to match clearinghouse requirements.

The move follows a no-action letter from the CFTC in December 2025 that cleared the way for futures commission merchants to accept stablecoins, bitcoin and ether as customer margin collateral. Marex is among the first to put that flexibility into practice inside traditional clearing infrastructure.

For market participants, the main benefit is timing. Crypto markets operate 24/7, and margin calls can occur outside standard banking hours. USDC collateral can be moved at any time, removing the constraint of waiting for bank opening times. Coinbase's custody for these balances is NYDFS-qualified and uses the same infrastructure that safeguards assets for most US spot crypto ETFs.

Coinbase says the service is integrated into its Prime platform, alongside the trading, custody, financing and derivatives tools institutions already use. Stablecoins have already become common in trading, treasury and settlement workflows; this launch extends their use into clearing, where collateral eligibility, reporting standards and regulatory oversight are more demanding.

The company describes the Marex launch as an early proof point for stablecoin collateral at scale. It expects the model to expand to additional clearinghouses, asset classes and margin workflows as the market moves toward always-on collateral.