How many free tool calls per day do AI agent platforms give?
Zambo gives 20 free calls per day, with no account and no card to start. That daily reset is the honest comparison point. A lot of agent platforms describe their free offer in credits instead of calls: a one-time balance that shrinks as you test, or a trial that asks for a card up front and converts if you forget to cancel. Useful for a demo, awkward for daily work. A daily call allowance is simpler to plan around: you know what today can hold, and tomorrow starts fresh.
Scope, stated once: an agent receipt is a record of one ai agent tool call that anyone can check: it keeps the exact saved bytes and their sha-256 digest, and it proves the result was not changed since it was saved, not that it was right.
Zambo is the verifiable work layer for AI. One MCP endpoint at https://zambo.dev/mcp carries 153 tools, 35 on the default surface, and HANDOVER is the flagship product built on top of it. The free tier is not a stripped demo of that system. It is the same endpoint, the same tools, and the same AER-1 receipt on every call, specified by the IETF Internet-Draft draft-zambo-aer1-26.
Why the shape of free matters more than the headline number
People comparison shop free tiers because they are deciding whether a tool fits their routine before money moves. Three questions cut through the marketing:
- Does it reset? A daily allowance supports a habit. A one-time credit supports a single test, then a paywall at the worst moment, mid job.
- Does it need a card? If the free tier needs a card, it is not really a free tier. It is a delayed charge with extra steps. Zambo needs no account and no card to start.
- Does free work count as real work? On Zambo, free calls produce the same receipts as paid calls. Work you do on the free tier can be handed to a client or a teammate and checked, which is the whole point of doing it through a verifiable layer.
Judge any platform, including this one, on those three. A big credit number that never resets and needs a card first loses to a modest daily number that is actually usable every day.
What 20 calls finishes in one ordinary day
Twenty calls sounds small until you list a real day against it:
- Morning checks, about 4 calls: live prices, inbox and calendar context, and the one fact you need before a decision, all from live tools instead of training data.
- One research pass, about 6 calls: search, compare, save sources, and pull the answer together with receipts behind each step.
- One deliverable, about 6 calls: draft, check, revise, and package a client update, a quote, or a short report.
- One handover, about 4 calls: save context, build the handover packet, and pass the work to another AI or another person with the record intact.
That is a complete small job, start to finish, inside the free day. Bigger days exist too, and that is what the Day Pass is for. But the free tier alone is enough to learn whether the workflow fits, with real output you keep.
Worked example: a real free tier receipt, checked live
From the public stream on October 25, 2026: a capability_search call saved at 2026-10-25T18:35:28Z, receipt at zambo.dev/run/48493b66-f9bf-4bff-80cb-052af5716698, saved result digest sha256:a2b6680939153af26134fbdd5aca53dc2544f8e8a2dcd9f1122975d585f30d4d.
The verification endpoint returned verified for this receipt. Open it, then paste the same link into zambo.dev/verify and watch the check run free, no account needed. A capability search is exactly the kind of call the free day is built for: your agent finds the right tool for a job before it spends calls doing the job itself.
When free stops being enough
| Plan | What you get | Price |
|---|---|---|
| Free | 20 free calls per day, same endpoint, receipt on every call | $0, no account, no card |
| Day Pass | 24 hours of full access for a heavy day | $0.99 USDC on Base for 24h |
| Zambo Pass | 30 days of ongoing access, one payment | $29 for 30 days |
| Zambo Pass annual | A full year on the same terms | $290 |
Start at zambo.dev/add. Use the free day honestly for a week. If you hit the limit on days that matter, the Pass removes the counting. If you do not hit it, you have a capable daily tool that costs nothing, and every result it gave you still carries its receipt.
Questions, answered
How many free tool calls per day do AI agent platforms give?
It varies a lot, and most offers are not daily at all. Many platforms hand out a one-time trial credit or ask for a card before the first real call, so the free amount runs out and does not come back. Zambo gives 20 free calls per day, every day, with no account and no card to start. When the day resets, the allowance resets with it.
What can 20 free calls actually finish in a day?
Plenty of real work: a morning of live price checks, a research pass that compares options and saves sources, a draft checked and revised, a client update pulled from saved context, and a handover packet for work moving to another AI. Each call returns a result plus its own receipt, so a full small job fits inside one free day.
Do free calls still get receipts?
Yes. Every Zambo call issues a receipt in the AER-1 format, free or paid. The receipt keeps the exact saved bytes and their sha-256 digest, so anyone you hand the receipt link to can check at zambo.dev/verify that the saved result was not changed since it was saved.
What happens when the 20 free calls run out?
You can wait for the next day, or keep going with a Day Pass at $0.99 USDC on Base for 24 hours of full access. Ongoing access is the Zambo Pass at $29 for 30 days, one payment, or $290 for a year. The endpoint, the tools, and the receipt format stay the same.