--- title: "Money S3 API: connect it to your AI chat ยท Hypamoon" description: "The Money S3 API is documented, but access goes through Money S3 first. What it takes to connect it to your AI chat with Hypamoon, with sources." url: https://hypamoon.com/connect-to/money-s3 --- 1. [Connect to](https://hypamoon.com/connect-to) 2. Money S3 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](https://money.cz/navod/api-v-money-s3-pro-vyvojare/) **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](https://money.cz/navod/api-v-money-s3-pro-vyvojare/) **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](https://money.cz/navod/api-v-money-s3-pro-vyvojare/) **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](https://www.money.cz/money-s5/api/) ## 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](https://hypamoon.com/docs/adapters) ### 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](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20Money%20S3.%20API%20docs%3A%20https%3A%2F%2Fmoney.cz%2Fnavod%2Fapi-v-money-s3-pro-vyvojare%2F.%20Read%3A%20%5Bwhat%5D.%20Write%3A%20%5Bwhat%2C%20or%20nothing%5D.) 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](https://hypamoon.com/r/build-an-adapter) ## Sources Checked on 7 November 2026. - [money.cz/navod/api-v-money-s3-pro-vyvojare/](https://money.cz/navod/api-v-money-s3-pro-vyvojare/) - [www.money.cz/money-s5/api/](https://www.money.cz/money-s5/api/) 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? 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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](https://claude.ai/new?q=Check%20if%20%5Bsoftware%5D%20has%20an%20open%20API%20that%20a%20Hypamoon%20adapter%20can%20use%3A%20public%20API%20docs%2C%20a%20key%20or%20token%20I%20can%20create%20myself%20without%20asking%20the%20vendor%2C%20and%20versions%20or%20a%20changelog.%20Link%20the%20pages%20you%20used.) [Open in ChatGPT](https://chatgpt.com/?q=Check%20if%20%5Bsoftware%5D%20has%20an%20open%20API%20that%20a%20Hypamoon%20adapter%20can%20use%3A%20public%20API%20docs%2C%20a%20key%20or%20token%20I%20can%20create%20myself%20without%20asking%20the%20vendor%2C%20and%20versions%20or%20a%20changelog.%20Link%20the%20pages%20you%20used.) 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. [Start free](https://app.hypamoon.com/?mode=signup&utm_source=connect-to&utm_campaign=money-s3) Works in Claude, ChatGPT and Copilot. [Add to Claude](https://hypamoon.com/connect?via=connect-to~money-s3#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~money-s3#chatgpt) [Add to Copilot](https://hypamoon.com/docs/microsoft-copilot)