Deterministic authentication
Real-time match / no-match results — a check either matches the Digital Watermark sealed at issuance or it doesn't. No probabilistic score for your team to interpret.
Capabilities
What the platform does today, and where it's headed. Checks are the live pilot rail; ACH and wire share the same register-and-authenticate design.
Digital Watermark
A cryptographic signature of the check's key details travels with each item and ties it back to what was issued — designed to survive everyday print, scan, and mobile-deposit handling.
Duplicate & stop-pay control
Items already paid elsewhere are flagged as duplicates across institutions, and stop payments take effect immediately — a voided check is caught the moment it's re-presented.
Single-item or bulk
Verify checks one at a time, or process industry-standard image cash letter files in bulk for clearing-adjacent workflows.
Built for integration
A modern API with safe retries, webhooks for register / verify / resolve events, a sandbox to start in, and official SDKs.
Bank-grade controls
Per-institution credentials, revocable sessions, role-based access, audit logging, and encryption of sensitive data — with traceable request IDs on every call.
Retention you control
Configurable storage tiers govern what CheckCheck keeps — from authenticate-only, with no account-holder data retained, up to encrypted full-record retention for deeper audit and analytics. You choose; your data is never pooled across institutions.
Put it in front of your team
Request a walkthrough of the API and the capabilities that matter for your check volume.