--- title: "BuchhaltungsButler API ยท Hypamoon" description: "The BuchhaltungsButler API is open and signs in with basic auth. What your AI chat can build with it on Hypamoon, how it connects, and the sources we checked." url: https://hypamoon.com/connect-to/buchhaltungsbutler --- 1. [Connect to](https://hypamoon.com/connect-to) 2. BuchhaltungsButler ERP and accounting # Connect BuchhaltungsButler to Hypamoon Yes. BuchhaltungsButler has a public, versioned API and you create the key yourself, so your chat can write the adapter. Open ## The check Three questions about the API of BuchhaltungsButler, answered from its own docs. **Public API docs**\ **Yes.** [Read the docs](https://app.buchhaltungsbutler.de/docs/api/v1) **A key you create yourself**\ **Yes.** You switch on the API yourself under Einstellungen, Schnittstellen und API-Zugang, and find your API client, API secret and API key there. [wissen.buchhaltungsbutler.de](https://wissen.buchhaltungsbutler.de/hc/de/articles/11468075328797-Einrichtung-der-API-Schnittstelle) **Versions or a changelog**\ **Yes.** The API carries a version in its path (v1). [app.buchhaltungsbutler.de](https://app.buchhaltungsbutler.de/docs/api/v1) **How it signs in**\ HTTP Basic with the API client and API secret, plus the customer's API key as a form field. **Webhooks**\ **Not confirmed.** **Hosting**\ Cloud ## In practice What it takes in a real BuchhaltungsButler administration. **Getting access**\ Not confirmed; the customer registers for API access and finds the api\_key in the company settings, but the client and secret are issued in a way not described. **Limits**\ 100 requests per customer per minute. [app.buchhaltungsbutler.de](https://app.buchhaltungsbutler.de/docs/api/v1) **Writing**\ **Not confirmed.** **Cost**\ Not published. ## What you can build Send receipts and invoices from your own tools into BuchhaltungsButler, and ask your chat which documents are still unbooked. Your chat writes it as a Hypamoon adapter from the docs above. Reading starts after you click Allow in the portal, and every write waits for your approval, one call at a time. [How adapters work](https://hypamoon.com/docs/adapters) ### Good to know - Your adapter uses a fixed key: you paste it once in the Hypamoon portal, never in the chat, and it only goes to the API host you allow. - Listed partner programs only need the API key that BuchhaltungsButler shows when you switch the partner on. ## Try it in your chat Fill in what to read and write, and send it. Say this in your chat > Build the Hypamoon recipe build-an-adapter for BuchhaltungsButler. API docs: https://app.buchhaltungsbutler.de/docs/api/v1. Read: \[what\]. Write: \[what, or nothing\]. [Open in Claude](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20BuchhaltungsButler.%20API%20docs%3A%20https%3A%2F%2Fapp.buchhaltungsbutler.de%2Fdocs%2Fapi%2Fv1.%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. - [app.buchhaltungsbutler.de/docs/api/v1](https://app.buchhaltungsbutler.de/docs/api/v1) - [wissen.buchhaltungsbutler.de/hc/de/articles/11468075328797-Einrichtung-der-API-Schnittstelle](https://wissen.buchhaltungsbutler.de/hc/de/articles/11468075328797-Einrichtung-der-API-Schnittstelle) BuchhaltungsButler 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 BuchhaltungsButler. 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 BuchhaltungsButler? 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=buchhaltungsbutler) Works in Claude, ChatGPT and Copilot. [Add to Claude](https://hypamoon.com/connect?via=connect-to~buchhaltungsbutler#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~buchhaltungsbutler#chatgpt) [Add to Copilot](https://hypamoon.com/docs/microsoft-copilot)