Sparkasse KölnBonn API Access & Open Banking

Reaching Sparkasse KölnBonn account data used to mean chasing PSD2 certificates, sandbox registrations and per-bank quirks. open-banking.io removes that layer entirely: it already speaks to Sparkasse KölnBonn (BIC COLSDE33XXX) alongside 2,600+ other EU and UK banks, so you sign up once and pull balances and transactions from a single dashboard. Both business and personal accounts are supported, and each consent stays valid for up to 180 days before Sparkasse KölnBonn asks you to reauthorise.

Everything is decrypted on your own device with a key only you hold. open-banking.io stores just your public key, so its servers can never read your statements — a genuinely zero-knowledge, certificate-free setup.

How to connect Sparkasse KölnBonn

Connecting happens inside the open-banking.io dashboard — there is no API call, code or key involved in this step.

  1. Create your open-banking.io account and set an encryption passphrase. Your keys are generated locally on your device.
  2. In the dashboard, search for Sparkasse KölnBonn and choose the account type you need — business or personal.
  3. You are redirected to Sparkasse KölnBonn's own secure login to approve access on the bank's PSD2 consent screen.
  4. Once you confirm, your selected accounts sync straight into your dashboard, ready to view or export.

Because approval takes place on Sparkasse KölnBonn's own pages, your credentials are never seen by open-banking.io.

Access your data

Once a connection exists, reading it programmatically is an optional developer step. On the Developers page, create an API key and export a credentials.json bundling that key with your private decryption key. Then use the CLI (openbanking accounts, openbanking transactions, openbanking sync), an SDK, or the REST API. Requests authenticate with the X-Api-Key header, and every response is decrypted locally with your own key — the API key alone only ever returns ciphertext. The CLI and SDK read and sync existing connections; they never create them.

All of this runs for roughly EUR 3/month.

Does open-banking.io work with both Sparkasse KölnBonn business and personal accounts?

Yes. Pick either account type when you add Sparkasse KölnBonn in the dashboard.

How long does a Sparkasse KölnBonn connection last?

Up to 180 days per consent, after which you reauthorise on Sparkasse KölnBonn's login screen.

Can open-banking.io staff see my Sparkasse KölnBonn transactions?

No. Data is decrypted only on your device with your private key; the service holds just your public key.

Start at open-banking.io.