AI agent receipt generator
An AI agent receipt generator is the executing layer itself, recording as it goes. When a tool call runs through it, four things happen in the same moment: the call executes, the system fixes what it observed (the tool, the time, the recorded inputs, and the saved output), a hash commitment is computed over the canonical bytes of that record, and a receipt is returned at a public URL with the result. Generation is not a step after the work. It is a property of where the work ran.
That timing is the whole distinction. A commitment computed at execution time binds the record to what the system actually saw. The same fields typed up later bind the record to whatever the writer chose to say, and a reader has no way to tell the difference from the document alone. So the test for any tool calling itself a generator is one question: does the receipt exist because the call ran through it, or because someone filled something in afterward? Only the first kind can be checked by a stranger, and only the first kind survives being checked.
- Connect once. Point your AI client at the recording endpoint: Zambo's MCP at zambo.dev/mcp works with the clients that support MCP, and the work itself does not change.
- Run the job normally. Every tool call returns its result plus its verifiable receipt, at a public URL you can keep, send, or file.
- Close the job. A multi-step run closes under a workflow record that binds the step receipts in order, so the set reads as one job, not a pile of links.
- Send the link, not the story. The receiver opens the record and recomputes it. Your summary can still introduce the work; it no longer has to carry the proof.
Generate your first receipt
The fastest honest test is a real call, not a screenshot of one. The live demo runs one real Zambo call and hands you its verifiable receipt, no signup: open it, read the fields, then check it at zambo.dev/verify and watch the commitment recompute. The receipts pillar page, AI agent receipts, shows the full set a finished run leaves behind, and the AI agent receipt API page covers the programmatic surface for agents that call tools directly.
For the job you actually need proven, the generator has to be in place before the job starts. That is a one-minute setup, and it is the difference between proof and apology: connect first, then run the work.
What a receipt generator cannot do
Honest limits, because a generator that hides them is selling something. It cannot receipt work that already ran somewhere else: unrecorded calls left no observed record to commit to, and a document created later is a reconstruction. It proves the saved result was not changed since it was saved; it does not prove the result was correct, the price was fair, or the decision was wise. And it records what the system observed, so a tool that returned wrong data produces a perfectly valid receipt for wrong data. The receipt settles what was recorded. Judgment about the work stays human, now exercised on a record instead of a claim.
What it costs
For $0.99, generate receipts for a full day of agent work instead of explaining one unrecorded job: a Zambo Day Pass covers 24 hours, every call receipted, no subscription. Ongoing use is the Zambo Pass at $29 a month or $290 a year, and $19 a month for $ZAMBO holders. Humans pay by PayPal or card through PayPal; agents pay in USDC on Base through the x402 flow, and the payment itself returns a receipt. The format the receipts follow is AER-1, an open IETF Internet-Draft (draft-zambo-aer1-23), so the records stay checkable by tools other than the one that generated them.
Frequently asked questions
AI agent receipt generator
An AI agent receipt generator is a system that creates a verifiable receipt at the moment an agent's tool call runs: it fixes the tool, the time, the recorded inputs, and the saved output under a hash commitment, and returns a public URL where anyone can check it. It is not a form that turns a summary into a document. A receipt written after the work, from the agent's own report, proves nothing the report does not. Run the work through a generator that records as it executes: Zambo at zambo.dev/mcp returns a verifiable receipt with every call, and the live demo mints a first one free.
Can I generate a receipt for work my agent already finished?
Not an honest one. A verifiable receipt has to be created when the call runs, because its commitment is computed over the result the system observed at that moment. For work that already finished unrecorded, the truthful artifacts are the raw outputs and files themselves, presented as what they are. What you can do is make the next job receipted from its first call: run it through a recording connection, and every step generates its receipt as it completes, so the proof exists before anyone asks for it.
What does a generated receipt prove?
One narrow thing, stated plainly: the saved result was not changed since it was saved. The receipt fixes what the system recorded for that execution, and anyone can recompute the commitment to confirm the record matches. It does not prove the agent was right, that the work is good, or that an outside outcome happened. Those judgments stay with the reader, who now makes them against a record that can be checked instead of a summary that has to be believed.
How do I check a receipt someone sends me?
Open the receipt's public URL and run the verification: recompute the output commitment from the canonical bytes and compare it with the commitment the receipt carries. A match means the saved result is the result that was recorded at execution time. A mismatch, or a step in a multi-step job with no receipt at all, means that step is unverified, whatever the accompanying summary says. Zambo receipts check at zambo.dev/verify/ with no account and no payment.
What does it cost to generate receipts for my agent's work?
The first receipt is free in the live demo, no signup. For real work, a Zambo Day Pass is $0.99 for 24 hours of calls, each returning its own verifiable receipt: that is the fix for the job you need proven today. Ongoing use is the Zambo Pass at $29 a month or $290 a year, and $19 a month for $ZAMBO holders. Humans pay by PayPal or card through PayPal; agents pay in USDC on Base through the x402 flow.