When building our agents and running multi-agent swarms, we ran into a problem: we couldn’t easily set separate budgets for each agent. So I built SpendGuard for our own use and figured we’d open-source it in case it helps anyone else.

It lets you create “agents” and assign each one a strict hard-limit budget in cents, with optional auto top-ups. No hosted API key is required, everything runs locally (except for the pricing list with recent models fetched from our server). The quickstart takes less than five minutes with Docker.

Happy to answer questions, take feature requests, and hear any feedback if you decide to try it.

Two pieces, both MIT: SDK: https://github.com/cynsta/spendguard-sdk Sidecar: https://github.com/cynsta/spendguard-sidecar