Sanctions designations are published as structured files by Treasury's OFAC and the EU's equivalent, usually with no advance warning, and markets about specific individuals, entities or countries resolve directly off those lists. You poll the official data files rather than waiting for coverage, diff each update against the last, and trade within seconds of a designation appearing. It is the rare geopolitical market with a machine-readable resolution source.
Markets on Polymarket where sanctions-list update monitor is the natural play:
