Signal 4: the strongest generation of ACH risk insights that catch 126% more risky dollars

Plaid has announced Signal 4, the fourth generation of its ACH risk model, which it says is designed to identify fraud and return risk by evaluating transactions within broader account behavior rather than as isolated events. The company reports that, in testing, its Bank Risk Score detected 126% more risky dollars than Signal 3 at a 5% decline rate, while its Customer Risk Score detected 26% more unauthorized returned dollars at a 1% decline rate and enabled approval of 7% more good dollars at a 1% return rate. Signal 4 adds a sequential foundation model trained to interpret transaction timing and patterns, cash-flow health indicators such as income and spending variability, and AI-based detection of previously unreported returns from transaction descriptions. Plaid also encourages customers to share return outcomes through its API, reporting that participating customers have seen a two- to threefold increase in dollar recall, and has introduced dashboard features for monitoring integration health, return rates, return codes, and institutions by return volume. Signal 4 is scheduled for broad release in early Q4 2026, with existing users expected to retain stable scores and score distributions without changing their rules or thresholds.

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