Kreissparkasse Steinfurt API Access & Open Banking

Kreissparkasse Steinfurt (BIC WELADED1STF) serves the Steinfurt district in North Rhine-Westphalia, and open-banking.io lets you reach its account data without the usual PSD2 friction. There are no eIDAS certificates to buy, no sandbox onboarding, and no bank-side developer contract. You link the account once in a browser, and from then on your balances and transactions belong to you — decrypted only on your own device with a key nobody else holds.

How to connect Kreissparkasse Steinfurt

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

  1. Sign up for open-banking.io and set an encryption passphrase. Your cryptographic keys are generated locally on your device, so the service only ever sees your public key.
  2. In the dashboard, search for Kreissparkasse Steinfurt and choose the account type you hold — business or personal are both supported.
  3. You are redirected to Kreissparkasse Steinfurt's own secure login, where you approve access under PSD2. open-banking.io never sees your banking credentials.
  4. Your accounts sync back into the dashboard. The consent lasts up to 180 days, after which you simply re-approve on the bank's screen.

Access your data

Reading the data programmatically is an optional step you take after the account is linked. Open the Developers page, create an API key, and export a credentials.json — this bundles the API key together with your private decryption key.

With that file in place, the CLI reads directly:

openbanking accounts
openbanking transactions
openbanking sync

The SDK and REST API work the same way, authenticating with the X-Api-Key header. Every response arrives encrypted and is decrypted locally with your private key. That is the point of the zero-knowledge design: an API key alone returns only ciphertext, because open-banking.io's servers cannot read your Kreissparkasse Steinfurt data. All of this runs on a flat subscription of roughly EUR 3/month.

Do I need an eIDAS certificate for Kreissparkasse Steinfurt?

No. open-banking.io is certificate-free — you approve access through the bank's own consent screen, so no QWAC or developer registration is required.

Can open-banking.io see my transactions?

No. The service holds only your public key. Data is decrypted on your device, so nobody at open-banking.io — or an attacker with your API key — can read it.

How long does access to Kreissparkasse Steinfurt last?

Each consent is valid for up to 180 days. When it expires, re-approve on Kreissparkasse Steinfurt's login screen to keep syncing.

Ready to start? Visit open-banking.io.