How often should I re-screen counterparties?

Re-screen before every transaction — not weekly, not monthly, not "we screened them last time." The SDN list updates daily, and a counterparty that was clean yesterday could be designated between transactions.

The daily update problem

OFAC updates the SDN list on a rolling basis — typically daily during business days. A wallet or entity added at 10:00 AM Eastern is enforceable immediately. If you screened at 9:00 AM and processed a payment at 10:30 AM without re-screening, you may have violated the new designation.

The practical answer

Integrate screening directly into your payment function — it fires on every call, so re-screening is automatic. SanctionsAI's API is designed for exactly this pattern: sub-100ms, idempotent, and free for up to 5 checks/day.