ERP and accounting
Connect Exact for Accountancy to Hypamoon
Yes, with one catch. Exact for Accountancy has an open API that you can use yourself, but it signs in with OAuth only, and that takes more work in a Hypamoon adapter today.
OpenThe check
Three questions about the API of Exact for Accountancy, answered from its own docs.
- Public API docs
- Yes. It uses the Exact Online REST API, which has its own accountancy endpoints. Read the docs
- A key you create yourself
- Yes. Register an app in the Exact Online App Store to get a client ID and secret; registrations can be used for your own account right away. A review is only needed before other customers use the app. support.exactonline.com
- Versions or a changelog
- Yes. Versioned paths (/api/v1/). start.exactonline.nl
- How it signs in
- OAuth 2.0 with a client ID and secret from your app registration; access tokens last 10 minutes and refresh tokens expire after 30 days without use.
- Webhooks
- Yes. It can tell your app when something changes. start.exactonline.nl
- Hosting
- Cloud
In practice
What it takes in a real Exact for Accountancy administration.
- Getting access
- Sign up for an Exact Online developer subscription, register an app in the App Store with a redirect URI, and authorize it once with the accountancy user.
- Limits
- Same per minute and per day limits per company and app as Exact Online. support.exactonline.com
- Writing
- Read and write. Create and change records in client administrations, and manage account owners, involved users and solution links through the accountancy endpoints.
- Cost
- Not published.
What you can build
List client administrations, account owners and involved users of the firm, and read or book in a client administration from your chat.
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
Good to know
- Exact for Accountancy signs in with OAuth or signed requests only, with tokens that expire. The Hypamoon vault holds a fixed key today, so an adapter for Exact for Accountancy takes more work: ask your chat to check this first.
- This is the same API as Exact Online, with extra accountancy endpoints for practice management (client groups, account owners, involved users). There is no separate API.
Try it in your chat
Fill in what to read and write, and send it.
Build the Hypamoon recipe build-an-adapter for Exact for Accountancy. API docs: https://start.exactonline.nl/docs/HlpRestAPIResources.aspx?SourceAction=10. Read: [what]. Write: [what, or nothing].
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 1 November 2026.
- start.exactonline.nl/docs/HlpRestAPIResources.aspx?SourceAction=10
- support.exactonline.com/community/s/article/All-All-DNO-Content-oauth-eol-oauth-devstep1?language=en_US
- support.exactonline.com/community/s/article/All-All-DNO-Simulation-gen-apilimits?language=en_US
Exact for Accountancy 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 Exact for Accountancy. Found something that changed? Tell us at support.
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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.
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.
Fill in the name of your software. Checking needs no connection to Hypamoon.
Ready to connect Exact for Accountancy?
Connect your chat once, then ask it to build the adapter.
Works in Claude and ChatGPT. Add to Claude Add to ChatGPT