AI SaaS cost tracking: attributing token spend per customer

AccountEngineer · reddit · 2026-08-17

An AI SaaS founder with 40 customers faces a billing blind spot: OpenAI invoices show total spend, not per-customer costs. While separate API keys track usage, they don't map to dollars, making it hard to prove if large accounts are profitable. Currently relying on manual spreadsheet distribution, the author seeks advice on better setups like logging every request, using a proxy, or off-the-shelf tools for accurate cost attribution.

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