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ERP and accounting

Connect Money S3 to Hypamoon

Possible, with help from Money S3. The API is documented, but you cannot just create a key: access goes through Money S3 first.

Possible

The check

Three questions about the API of Money S3, answered from its own docs.

Public API docs
Yes. Public developer guide for the GraphQL API, with a browsable schema. Read the docs
A key you create yourself
No. The developer requests an application id by form; the customer needs the paid API module and creates an API key under Tools, XML data exchange, API keys. money.cz
Versions or a changelog
Not confirmed.
How it signs in
OAuth 2 with the client id and secret of an API key made in Money S3 plus an application id from Money; a password grant with a Money S3 user is also possible.
Webhooks
No. money.cz
Hosting
Cloud and self-hosted
Condition
The API module is a paid add-on of 4,990 CZK a year excluding VAT, and the application id is requested from Money by form.

In practice

What it takes in a real Money S3 administration.

Getting access
Request an application id from Money by form; the customer buys the API module, installs it with Money S3 and creates an API key with a client id and secret.
Limits
None published.
Writing
Read and write. GraphQL mutations such as createIssuedInvoice, processed through the import queue; payroll and the general ledger are read only.
Cost
API module 4,990 CZK a year excluding VAT. money.cz

Your own order and invoice flow on Money S3, built around how your customers buy.

  • Invoices, orders, stock and contacts, from the areas your API key's user may see.
  • AI that prepares invoices from orders and spots late payers, with you approving every document.
  • A screen for your team and a short weekly email for you.

Ask your chat

Answers straight from your Money S3 data, in Claude or another chat with the full Hypamoon connection.

  • Which issued invoices are more than 30 days overdue?
  • Which items are below their minimum stock?

On a schedule

Money S3 has no webhooks, so an agent checks every 15 minutes and decides what happens next.

  1. Every 15 minutes

    New orders in your web shop that are not in Money S3 yet.

    AI decides

    AI checks the customer, prices and VAT and prepares the invoice.

    Then

    The invoice goes into Money S3's import queue after you approve it.

    AI proposes, you approve

A screen for your team or customers

An app on your own address, with sign-in, on top of the same Money S3 data.

  • For your customers

    Customers sign in and see their open invoices, straight from Money S3.

Add Hypamoon

Text messages, email, phone, payments and agents run in the same project as the adapter.

  • Email

    A morning email with the invoices that passed their due date yesterday.

Money S3 stays the core: your chat builds the rest on its API, as an adapter plus an app and agents in your Hypamoon project. Reading starts after you click Allow in the portal. Every change an agent or a chat makes in Money S3 waits for your approval, one call at a time. How adapters work

Good to know

  • Money S3 signs in with OAuth or signed requests only, with tokens that expire. The Hypamoon vault holds a fixed key today, so an adapter for Money S3 takes more work: ask your chat to check this first.
  • Money S3 runs on your own computer and must be running. The API is reached through a cloud address set at installation, or locally on port 85.
  • Writes go through Money S3's import queue. Payroll and the general ledger are read only. The user linked to the API key decides what can be read or written.

Try it in your chat

First get access from Money S3. Then fill in what to read and write, and send it.

Say this in your chat

Build the Hypamoon recipe build-an-adapter for Money S3. API docs: https://money.cz/navod/api-v-money-s3-pro-vyvojare/. Read: [what]. Write: [what, or nothing].

Open in Claude

In Claude, or another chat with the full Hypamoon connection; adapters are not in ChatGPT yet. You paste the key in the portal, never in the chat. The full recipe

Sources

Checked on 7 November 2026.

Money S3 is a name of its owner, used here only to describe the software. This page is not an official integration and Hypamoon has no partnership with Money S3. Found something that changed? Tell us at support.

More in erp and accounting

All 1094 tools

Tool not listed? Ask the chat to check its API.

The same three checks work for any software. Your chat reads the vendor's own docs and tells you what it found.

Say this in your chat

Check if [software] has an open API that a Hypamoon adapter can use: public API docs, a key or token I can create myself without asking the vendor, and versions or a changelog. Link the pages you used.

Open in Claude Open in ChatGPT

Fill in the name of your software. Checking needs no connection to Hypamoon.

Ready to connect Money S3?

Connect your chat once, then ask it to build the adapter.

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