Costbase

Most AI billing dashboards require you to reroute production traffic through a third-party gateway to get any cost breakdown. Costbase takes a different approach: it reads aggregate usage from each provider’s official admin reporting APIs — the same endpoints that back the providers’ own billing pages — so your request path stays untouched. The setup is four steps: connect a provider with one admin key, let the tool discover every API key in the account, rename each key to the product it powers, and read a unified chart grouped by app, provider, or model. The vendor states a full year of historical usage is backfilled on connection.

The defining architectural choice is the pull-don’t-proxy model. Proxy-based cost tools insert themselves into your critical path — added latency, a new dependency, and your prompts transiting someone else’s infrastructure. Costbase operates out-of-band: it can be slow or unavailable and your production apps are unaffected. Admin keys are used only for read-only reporting endpoints, encrypted at rest, and never used to modify anything in your accounts.

Costbase fits teams who have already built their AI products and are now trying to understand what they actually cost to run. It covers models beyond chat completions — Whisper transcription, embeddings, images, and text-to-speech — which most proxy-based tools ignore or flatten. The gaps show up when you need granularity below the key level: xAI spend appears account-level only because xAI reports at the team scope, not the key scope. And because there is no API and no self-hosted option, teams with compliance requirements around data residency or those who need to feed cost data into their own reporting pipelines will find the tool a dead end.

Data freshness carries a built-in lag: providers publish usage with a delay of minutes to a few hours, and Costbase re-pulls the last three days every hour to converge on invoice-accurate figures. The vendor marks each cost figure as either provider-reported dollars or a computed estimate (tokens × a maintained pricing table), so you can see exactly which numbers are authoritative and which are approximations.