Not 'is this address sanctioned' (that's sanctions) but 'has it DEALT with one' — screens a wallet's USDC counterparties (both directions) against the OFAC SDN list. Taint by association: receiving from or routing through a wallet that transacts with sanctioned addresses carries sanctions risk. Returns the sanctioned counterparties found. Covers direct counterparties; pair with fund-trace for the multi-hop funding chain. Not financial advice.

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