CAINBudget, explained for beginners

CAINBudget is a hard spending limit for each AI agent: one cent over and the spend is refused.

What it is

AI agents spend money: model calls, cloud resources, purchases. Without a limit, one agent stuck in a loop can run up a bill overnight. CAINBudget holds a budget for each agent, for example $50 a day.

Before the agent spends, it asks CAINBudget. Inside the budget: ALLOW. Over it, even by one cent: DENY, with the reason. An agent with no budget at all is denied (fail-closed). Real spends are reserved atomically, so two requests arriving at the same moment cannot both squeeze under the limit. Every answer carries a signed receipt.

An everyday comparison

A prepaid card for each agent. When it's empty, it's empty, however the agent asks.

How it works, in 4 steps

1. Give the agent a budget: an amount and a window (day, month, or total).
2. Before spending, the agent asks for the amount.
3. ALLOW if it fits, DENY if it doesn't, with a signed receipt.
4. Reserved amounts count against the budget until committed or released.

Try it now

Open the five live demo tools → Every button sends a real request to the live product and shows the real answer.

See it on the homepage: CAINBudget section →

Who it is for

Teams running AI agents that call paid models, cloud APIs or buy things, and the finance people who see the bill.

FIRME AI CORPORATION · CAIN-42 is a Byzantine trust fabric. Numbers marked "our own check" were run by us, not by an independent party. Nothing on these pages is a certification.