#usage-billing

Usage metering for AI SaaS billing, comparing a naive counter with a deduplicating ledger on 200,000 usage events

Duplicate usage events overbilled an AI SaaS bill by $115

A plain usage counter overbilled $3,266.75 of AI usage by $114.86, a 3.5 percent error, because the queue delivered 6,984 events twice. All 500 tenants were billed wrongly. Recording each event once

Fri Oct 23 2026 · 9 min read · 0 views

AI