Mastercard Screens Stablecoin Payments Before Onchain Transfer

Mastercard announced Stablecoin Security on Oct. 19, 2026, at Money20/20 USA in Las Vegas. The service gives banks and payment providers a risk score for stablecoin payments before completion. It will launch first in North America, with worldwide commercial availability expected in 2027.

Ann Johnson, Mastercard’s executive vice president of Security Solutions, introduced the product. According to Mastercard, Stablecoin Security assesses a payment “from payment initiation through on-chain movement” and provides a score before the transaction is completed.

Financial institutions will access the service through a platform-agnostic application programming interface, or API. The score can flow into existing fraud, compliance and case-management systems. A bank or payment provider can then hold a payment for review or allow it to proceed. Mastercard has not said that the score automatically blocks transactions.

Borderless.xyz and Keyrails are the first partners. Both are part of Mastercard’s Start Path Blockchain and Digital Assets program. Mastercard also named BVNK as a partner for a broader rollout planned for 2027.

In Mastercard’s example, a coffee shop in Boston pays a supplier in Brazil through a bank that uses stablecoins for the cross-border portion of the payment. Before the stablecoin transfer is sent, the bank or its service provider checks the payment through Stablecoin Security. The result helps determine whether the payment should continue or be reviewed.

Mastercard has not disclosed the service’s pricing, supported blockchains or stablecoins, the data providers used to produce its scores, or the thresholds that trigger a review. The company has not announced a specific North American go-live date or named a bank customer.

Mastercard cited a Bank for International Settlements study of 593 million stablecoin transfer events across 141 million Ethereum transactions in 2025. Nearly 60% of the events occurred within complex transactions rather than simple transfers between two addresses. The study covered Ethereum and included USDT, USDC and PYUSD activity.

Blockchain analytics services already monitor wallet addresses and onchain transfers for links to sanctioned entities, fraud and other illicit activity. Mastercard described Stablecoin Security as adding payment information, such as the parties involved, the amount and the transaction context, to the assessment. The company has not specified whether its onchain data comes from an internal system or an outside provider.

The service follows Mastercard’s Crypto Secure product, introduced in October 2022. Crypto Secure helps card issuers assess cryptocurrency exchanges and other virtual-asset service providers. Stablecoin Security is designed to assess individual stablecoin payments across their fiat and onchain stages.

The U.S. GENIUS Act requires permitted stablecoin issuers to follow anti-money-laundering, sanctions, customer-identification and customer-due-diligence rules. It also requires issuers to maintain the technical ability and procedures to block, freeze or reject specified transactions. Banks and payment providers that use stablecoins have separate compliance obligations, and a risk score does not remove their responsibility to review payments.

Mastercard processes about 175 billion transactions a year and uses threat intelligence from Recorded Future. The company has not confirmed whether Recorded Future data will be used in Stablecoin Security.