Payments and billing
Connect Knab to Hypamoon
Possible, with help from Knab. The API is documented, but you cannot just create a key: access goes through Knab first.
PossibleThe check
Three questions about the API of Knab, answered from its own docs.
- Public API docs
- Yes. Knab publishes PSD2 APIs (Consents, Funds Confirmations, Payments, Transactions) with OpenAPI 3.0 specifications and a sandbox. Read the docs
- A key you create yourself
- No. Production access is requested by email and needs a PSD2 licence number and eIDAS certificates (QWAC and QSealC). Knab offers no API for business customers without a licence. developer.knab.nl
- Versions or a changelog
- Yes. Each API carries a version number, such as Transactions API 2.0.0, and is marked stable. developer.knab.nl
- How it signs in
- OAuth 2.0 with the consent of the account holder, mutual TLS with a QWAC certificate and signed requests with a QSealC certificate.
- Webhooks
- Not confirmed.
- Hosting
- Cloud
- Condition
- Only licensed PSD2 providers get production access. A normal company reads its Knab accounts through a licensed aggregator, such as Enable Banking (https://enablebanking.com/docs/api/linked-accounts/) or Ponto Connect (https://documentation.isabel.eu/ponto-connect/2/products); check that it covers Knab.
What you can build
See the transactions of your Knab business account in your own dashboard through an aggregator, and match incoming payments to open invoices.
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
- Knab signs in with OAuth or signed requests only, with tokens that expire. The Hypamoon vault holds a fixed key today, so an adapter for Knab takes more work: ask your chat to check this first.
- Knab's APIs are PSD2 APIs for licensed third party providers. The portal says it is still being developed, with PSD2 as the first scope.
Try it in your chat
First get access from Knab. Then fill in what to read and write, and send it.
Build the Hypamoon recipe build-an-adapter for Knab. API docs: https://developer.knab.nl/introduction. 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 7 November 2026.
Knab 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 Knab. 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 Knab?
Connect your chat once, then ask it to build the adapter.
Works in Claude, ChatGPT and Copilot. Add to Claude Add to ChatGPT 
Add to Copilot