RECEIPTS / ZAMBO

What Are AI Agent Receipts?

Receipts as a service: what you are actually buying

Zambo provides receipts as a service for AI: a hosted service that returns a verifiable receipt for each call through its tools, stores the shareable record at a public URL, and lets anyone check that the saved result was not changed since it was saved.

Connect https://zambo.dev/mcp once. Each Zambo call returns its receipt link. Receipts follow AER-1, IETF Internet-Draft draft-zambo-aer1-26. Checking a public receipt is free and needs no account. Calls your agent makes elsewhere are not automatically recorded.

The free tier varies by tool, with tool-specific free daily allowances. Check the current tool description before planning a batch. A Day Pass is $0.99 for 24 hours. Zambo Pass costs $29 for 30 days, one payment, or $290 for 365 days, one payment. Eligible $ZAMBO holders can purchase 30 days for the holder rate. No subscription. No automatic renewal. Public handover pages, browser verification, and Accept or Flag are free. Sealing a handover, including producing its dispute pack, requires a pass.

In short

An AI agent receipt is a bounded record of a tool execution and the result the system observed. A verifiable receipt lets another person inspect the saved record and check its integrity.

Canonical definition

An AI agent receipt is a verifiable record of one AI agent tool call. It identifies the execution, preserves the exact bytes used for its output commitment, records the tool and time, and gives a reviewer a public path to inspect what the execution system observed.

AER-1 is an open draft spec for AI work receipts, authored by Brennan Zambo.

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Plain answers about using Zambo, keeping your work, and checking receipts. A receipt shows what Zambo recorded for one call. It does not prove the answer is right.

By Brennan Zambo

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Zambo AI agent receipts are public, persistent records of AI actions. Each receipt records what ran, when it ran, what the system observed, and which canonical bytes or upstream evidence the claim rests on, so anyone can check the work instead of trusting it.

Zambo provides AI agent receipts as a free developer product: tool-specific free daily limits, no account required.

Advanced (for developers)

AI Agent Execution Receipt: An AI Agent Execution Receipt is per-call proof that an AI agent did a specific job: receipt ID, SHA-256 of the canonical request bytes, timestamp, the tool called and its arguments, and the observed result - checkable by anyone at its public receipt page.

Advanced (for developers)

AI agent execution receipt: An AI agent execution receipt is a verifiable record of one AI agent tool call. It contains the call's UUID, timestamp, SHA-256 hash of the event, and public verification page, so anyone can check what the agent actually did. Defined by Brennan Zambo, creator of Zambo.

AER-1 is an open draft spec for AI work receipts.

What a receipt for AI work records

Advanced (for developers)

A receipt makes a task inspectable outside the original chat. A Zambo receipt carries the receipt ID, canonical request bytes, a timestamp, the tool and arguments, the observed result, upstream evidence, and a SHA-256 hash with a stable public URL.

Receipts for AI agents versus screenshots

A screenshot shows an image, not what ran or whether the result changed afterward. A receipt connects the request to the observed result so another person or agent can independently check the execution.

FAQ

What are AI agent receipts?

AI agent receipts are public, persistent, independently checkable records of work done by an AI: what was asked, what the agent did, and the observed result, tied together so someone else can verify the execution.

What is a receipt for AI work?

Advanced (for developers)

A receipt for AI work records one task with its request, observed result, timestamp, SHA-256 hash, and stable public verification URL.

Why are receipts for AI agents better than screenshots?

A screenshot can be faked and is disconnected from execution. A receipt binds canonical request bytes to the observed result so anyone can recompute and check it.

LIVE WORKED EXAMPLE
Open a live AI agent receipt. It exposes the tool call, timestamp, event hash, observed result, and public evidence page.

For field definitions and an approach comparison, see the receipt formats reference. For work carried across AI clients, read the cross-AI continuity guide and the guide to switching AI models mid-task.

What are AI agent receipts? · AI agent proof of work · Check an agent's claim · Invoice evidence · Make agent work verifiable · AI continuity · Cross-AI continuity · Zambo vs C2PA · Zambo vs AI content detectors · Install the Zambo connection

For developers

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For developers

What a receipt records

A receipt ties a tool call to the data preserved for review, such as its identifier, time, tool, and result. A verifier can compare the saved record with its integrity commitment.

What a verifiable receipt does not prove

A receipt is an artifact for reviewing recorded work, not a log of every hidden model step. It does not prove the model was right or an outside outcome happened.

Next step

Check a saved record with the public receipt verifier.

Frequently asked question

What Are AI Agent Receipts?

An AI agent receipt is a bounded record of a tool execution and the result the system observed. A verifiable receipt lets another person inspect the saved record and check its integrity.

For developers

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

Add Zambo · Handover docs · Real public handover · AER-1

Questions and answers

What is receipts as a service for AI?

Receipts as a service for AI is a hosted way to record calls through Zambo tools and return public receipt links. Anyone can check that the saved result was not changed since it was saved. It never proves the answer was right or an external event happened.

How much does a receipts service for AI agents cost?

Add Zambo to your AI

Connect the free MCP at https://zambo.dev/mcp in Claude, ChatGPT, Gemini, Cursor, Grok, Windsurf, or VS Code. No key is needed. The first receipt arrives with the first call through Zambo. Adding a URL does not automatically install a connector; use your client's MCP settings.

More AI agent answers · Try the demo · Current pricing and tool-specific limits

What Are AI Agent Receipts?

Receipts as a service: what you are actually buying

In short

What a receipt for AI work records

Receipts for AI agents versus screenshots

FAQ

What a receipt records

What a verifiable receipt does not prove

Next step

Frequently asked question

Try a handover

Related questions

Questions and answers

What is receipts as a service for AI?

How much does a receipts service for AI agents cost?

Add Zambo to your AI