--- title: "Abacus API: connect it to your AI chat ยท Hypamoon" description: "The Abacus API is documented, but access goes through Abacus first. What it takes to connect it to your AI chat with Hypamoon, with sources." url: https://hypamoon.com/connect-to/abacus --- 1. [Connect to](https://hypamoon.com/connect-to) 2. Abacus ERP and accounting # Connect Abacus to Hypamoon Possible, with help from Abacus. The API is documented, but you cannot just create a key: access goes through Abacus first. Possible ## The check Three questions about the API of Abacus, answered from its own docs. **Public API docs**\ **Yes.** [Read the docs](https://downloads.abacus.ch/fileadmin/ablage/abaconnect/htmlfiles/docs/restapi/abacus_rest_api.html) **A key you create yourself**\ **Yes.** An Abacus administrator creates a service user in user management and copies its Client ID and Client Secret. [downloads.abacus.ch](https://downloads.abacus.ch/fileadmin/ablage/abaconnect/htmlfiles/docs/restapi/abacus_rest_api.html) **Versions or a changelog**\ **Not confirmed.** **How it signs in**\ OAuth 2.0 client credentials with the Client ID and Secret of an Abacus service user; the token endpoint comes from the server's OpenID configuration. **Webhooks**\ **Not confirmed.** **Hosting**\ Cloud and self-hosted ## In practice What it takes in a real Abacus administration. **Getting access**\ Your Abacus administrator creates a service user in user management (Q981 for the general REST APIs) and gives you its Client ID and Client Secret, plus the server address. **Limits**\ None published. **Writing**\ **Not confirmed.** Not stated on the page read; check the Swagger UI on your Abacus server. **Cost**\ Not published. ## Your own overview on Abacus, built around the questions your team asks every week. - Data from the Abacus APIs your service user may use, once your server is reachable. - AI that spots open items and projects that need attention, with you deciding what happens. - A screen for your team and a short weekly email. ### Ask your chat Answers straight from your Abacus data, in Claude or another chat with the full Hypamoon connection. - Which debtors have open items older than 60 days? - Which projects booked more hours than planned this month? ### On a schedule Abacus has no webhooks we could confirm, so an agent checks every 15 minutes and decides what happens next. 1. Every 15 minutes Every Monday morning. AI decides AI looks at open items and decides which customers to follow up first. Then You get one email with the list. ### A screen for your team or customers An app on your own address, with sign-in, on top of the same Abacus data. - For your team Your team sees open items and project status from Abacus in one screen. Abacus 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 Abacus waits for your approval, one call at a time. [How adapters work](https://hypamoon.com/docs/adapters) ### Good to know - Abacus signs in with OAuth or signed requests only, with tokens that expire. The Hypamoon vault holds a fixed key today, so an adapter for Abacus takes more work: ask your chat to check this first. - Abacus often runs on your own server or at a hosting partner. The REST API is served by that Abacus server, so it must be reachable over HTTPS for an adapter. - The endpoints available depend on your Abacus server; its Swagger UI lists them. ## Try it in your chat First get access from Abacus. Then fill in what to read and write, and send it. Say this in your chat > Build the Hypamoon recipe build-an-adapter for Abacus. API docs: https://downloads.abacus.ch/fileadmin/ablage/abaconnect/htmlfiles/docs/restapi/abacus\_rest\_api.html. Read: \[what\]. Write: \[what, or nothing\]. [Open in Claude](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20Abacus.%20API%20docs%3A%20https%3A%2F%2Fdownloads.abacus.ch%2Ffileadmin%2Fablage%2Fabaconnect%2Fhtmlfiles%2Fdocs%2Frestapi%2Fabacus_rest_api.html.%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. - [downloads.abacus.ch/fileadmin/ablage/abaconnect/htmlfiles/docs/restapi/abacus\_rest\_api.html](https://downloads.abacus.ch/fileadmin/ablage/abaconnect/htmlfiles/docs/restapi/abacus_rest_api.html) Abacus 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 Abacus. 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 Abacus? 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=abacus) Works in Claude, ChatGPT and Copilot. [Add to Claude](https://hypamoon.com/connect?via=connect-to~abacus#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~abacus#chatgpt) [Add to Copilot](https://hypamoon.com/docs/microsoft-copilot)