SaaSpec

At the end of the month, you can export a CSV of what each of your users spent on LLM tokens and turn it into Stripe invoices.

That is the core job SaaSpec does.

SaaSpec is an AI accounting and API cost tracking tool for developers who want to sell pay-as-you-go software built on top of large language models.

Instead of absorbing API bills into a flat subscription, you record the token costs tied to each individual user, then bill them for what they actually used.

The workflow is simple on paper.

SaaSpec tracks token costs per user, lets you export that month's user data as a CSV, and converts the data into Stripe invoices.

If you already collect payments through Stripe, that fits neatly into how you bill today.

The catch is coverage.

SaaSpec currently supports only OpenAI models, so if your product calls Anthropic, Google or other providers, you cannot track those costs here yet.

For teams that run entirely on OpenAI, it covers the metering and invoicing steps in one place.