How to Choose a Billable Metric (and Why Most Companies Get It Wrong)
Blog post from Lago
Usage-based pricing depends primarily on selecting an appropriate billable metric rather than choosing a pricing structure first, because changing metrics later can disrupt customer workflows and contracts. Effective metrics should correlate with company costs, align with customer-recognized value, avoid discouraging beneficial product use through a “taximeter” effect, and remain predictable enough for customers to estimate bills in advance. Examples such as token-based AI pricing, SMS messages sent, and analytics events illustrate metrics tied to observable, customer-controlled activity, while per-page, per-email-open, or poorly chosen event charges can distort behavior and reduce product value. The text distinguishes billable metrics from plan-based usage restrictions, which can segment customers by scale without directly charging per unit, and notes that hybrid pricing may use multiple metrics if each meets the same criteria. It also emphasizes that billing systems must apply the correct aggregation method, deduplication, and transparent calculation rules to prevent inaccurate invoices and disputes.
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