An autonomous agent with a payment method is a powerful thing — and a slightly terrifying one. The same loop that researches leads can, with a bad prompt, burn your credits on a runaway tool call. Guardrails aren't optional.
Three layers of control
- Spend caps — hard ceilings per agent, per key, and per time window. When the cap is hit, calls fail closed.
- Rate limits — bound calls-per-minute so a loop can't stampede a provider.
- Alerts — webhook and email thresholds well before the cap, so a human can intervene.
Fail closed, not open
The default when a budget is exhausted should be to stop, not to keep going and reconcile later. Aperture rejects the call with a clear error the agent can reason about.
Treat an agent's budget like a blast radius: assume it will be spent in the worst possible order, and size it accordingly.
Every paid call through Aperture is metered against the budgets you set in the console — no extra instrumentation required.
Written by Priya Nair
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