Learn CAINBudget: from zero to expert, then sell it

No AI background needed. Five levels, each with something to actually do, at your own pace. Tick items as you go (your ticks stay in this browser).

Evidence, proof and selling tools for CAINBudget

Level 1 Beginner: understand it

Each agent gets a budget. Every spend is checked first. Over budget means no.

Think of it like this: A prepaid card for each agent. When it's empty, it's empty, however the agent asks.

Read the full plain-English explanation: CAINBudget, explained.

• I read the explanation above.
• I can say what it does in one sentence, without notes.

Level 2 User: see it work

Run it live: open the live demo. Before each result, guess what will happen. These are checks it must pass:

• Ask for $49.99: Under the limit.
• Ask for exactly $50.00: Exactly the limit is allowed.
• Ask for $50.01 (one cent over): One cent over the limit is refused.
• Ask for $75: Over the limit.
• Ask for a billion dollars: Scientific notation doesn't slip past the check.

• I ran the live demo.
• I can explain what one of these checks shows.

Level 3 Verifier: prove it yourself

This is the skill that sets you apart: you don't have to believe us, and neither do your customers.

1. Install Python 3 if you don't have it (python.org/downloads).
2. Download the kit and unzip it.
3. Open a terminal in that folder. On Windows, click the folder's address bar, type cmd and press Enter. On a Mac, right-click the folder and choose New Terminal at Folder.
4. Run python3 verify.py (on Windows, python verify.py). It checks the seal without the internet.
5. Run python3 verify.py --live. It repeats every check from your own computer.
6. Try to cheat it: open transcript.json in a text editor, change one character, save, and run python3 verify.py again. It must now say FAIL. Unzip a fresh copy afterward.

• I ran the kit's check on my own computer.
• I changed a file and saw it fail.

Level 4 Expert: know the edges

An expert knows what a product does not do, and says it first. That is what makes a buyer trust you.

• It only knows about spending your agent asks it about. A payment step that skips the check is not covered.
• It counts money you tell it about; it does not read your cloud or card bills.
• Receipts are signed with this deployment's own software key (not a hardware key).
• Found 2026-11-03: the amount 'Infinity' caused a server error instead of a clean refusal. Nothing was allowed; the fix is written and waiting to be deployed.

You can say

• One cent over the limit is refused.
• No budget means no spend.
• Every answer has a signed receipt.

Never say

• "Controls your cloud bill" (it only knows spends it is asked about).
• "Moves or holds money".

Read the questions real buyers send, with honest answers: answers to buyer questions.

Test yourself (click a question to see the answer)

• I got every quiz question right without looking.
• I can name one thing it does not do.
• I explained it to a friend, and they understood it.

Want a formal study path? The CAIN Academy has courses and exams. Finishing this page is your own practice; it is not a qualification or certification.

Level 5 Seller: put it in front of a customer

1. Copy, paste, send: the shortest route, no technical skill needed.
2. Who buys it and where to find them.
3. The sales conversation, then the offer and the close.
4. The rules: read these before your first message.
5. Selling tools with this product's evidence built in: pitch, emails, call script, objection answers, one-pager.

• I read the rules.
• I sent my first personal message.

About money: your share is agreed in writing with FIRME AI CORPORATION before your first message (email vincent@firmeai.com). Nothing here promises income. Most messages get no reply; that is normal.