Can I try an AI agent receipt tool before paying for it?
Yes, and you should not pay for one you cannot try. Zambo's demo runs a real job and mints a real verifiable receipt in about a minute, with no account and no card. Check that receipt on the verify page, then run one of your own jobs on the free tier.
A receipt tool asks for an unusual kind of trust: trust about trust. The only sensible trial is one where the artifact can be tested, not the pitch. So the trial here is the product itself at small scale. The demo executes an actual job through the connection, and the receipt it produces is a normal receipt: same format (AER-1, IETF Internet-draft-zambo-aer1-21), same fields, same public check.
After the demo, the free tier carries the trial into your own work. Every tool has a free daily allowance (up to 20 free calls a day on metered tools, some tools unlimited), which is enough to record a first client job, build a handover, and watch a client open the link and check it. That is the moment the tool proves itself or does not, on your work, with your client.
Paying enters only when the trial has already answered the question and a live problem needs more: a full day of proof for a delivery or a dispute is the $0.99 Day Pass, one time, no subscription. If the trial did not convince you, you have spent a few minutes and nothing else, and you keep the receipts you made.
Checklist: the 15-minute trial that settles it
1. Run the demo; save the receipt ID it mints. 2. Check that receipt at https://zambo.dev/verify/ and read what the check actually recomputes. 3. Run one small real job through the connection. 4. Build its handover and open the link in a private browser window, the way your client will. 5. Read the source states; find one not checked item and confirm it is labelled, not hidden. 6. Decide: if steps 2 to 5 behaved as promised, the tool has earned a $0.99 day when you need one.
Worked example
The demo's receipt is the example, and it is deliberately unglamorous: a small job, a saved result, a digest that recomputes clean. Compare it with the two public handovers, https://zambo.dev/handover/45434a17-4afc-486a-9646-e689bcee4297 (accepted by its client) and https://zambo.dev/handover/bd7e5325-33fd-4c5e-b029-76b781fa2f51 (still pending). Your trial receipt is the same species as both.
Frequently asked questions
Do I need a credit card to try it?
No. The demo needs nothing, and the free tier needs no card. A card only enters if you choose the Day Pass or a monthly pass later, and humans pay through PayPal when they do.
Is the demo receipt a real receipt or a simulation?
A real one. The demo runs an actual job through the same connection and saves the same AER-1 receipt format as paid work. You can check it on the public verify page like any other receipt.
What happens to my trial receipts if I never pay?
They stay yours to open and check. Trying the tool does not hold your records hostage; export and keep anything you made during the trial.
By Brennan Zambo, founder of Zambo.
Last verified: 2026-10-17.
Try a handover
A handover gives your client one proof link with verifiable receipts to review, then Accept or Flag.
try it: say 'use zambo to hand this over to <client>' in your ai