Open source

The open-source tool that stops runaway AI agents.

RelayPlane is a free, MIT-licensed cost-intelligence proxy for AI agents. Hard cost caps, kill switches, smart model routing, 11 providers. It's how I keep my own pipeline from burning money, and it ships inside every engagement.

View on GitHub →★ 180 stars · MIT
relayplane
$ relayplane route --cap 200
→ request: gpt-class, 14k tokens
→ routed: cost-equivalent model · saved $0.41
→ daily spend: $198.20 / $200.00
• cap reached · downgrading non-critical calls
• runaway loop on agent#7 · kill switch fired
✓ held at cap. nothing over-ran.
Hard cost caps

Set a daily ceiling. The proxy enforces it, no surprise bills.

Kill switches

Detect a runaway loop and cut it before it drains the account.

Smart routing

Send each call to the cheapest model that can actually do it.

11 providers

One proxy in front of every provider you already use.

View on GitHub →Need it wired in for you? See the Loop track →

Free. No pricing, no signup. It's open source.