Sparkasse Duisburg API Access & Open Banking Data

Sparkasse Duisburg serves the Ruhr city of Duisburg with both business and personal accounts, and open-banking.io lets you reach that account data through a single, privacy-first workspace. Instead of chasing eIDAS certificates or wiring up a bespoke PSD2 client, you link the bank once and your balances and transactions flow into a dashboard where only you hold the decryption key. It works across 2,600+ EU and UK banks, so Sparkasse Duisburg can sit alongside the rest of your accounts in one place.

How to connect Sparkasse Duisburg

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 your encryption passphrase. Your keys are generated locally on your own device, so the service never sees them.
  2. In the dashboard, search for Sparkasse Duisburg (BIC DUISDE33XXX) and choose your account type — business or personal.
  3. You are redirected to Sparkasse Duisburg's own secure login, where you approve access under PSD2. Consent lasts up to 180 days before you renew it.
  4. Your accounts sync back into the dashboard, decrypted locally for your eyes only.

Because approval takes place on the bank's own consent screen, your credentials are never shared with open-banking.io.

Access your data

Once Sparkasse Duisburg is connected, reading the data programmatically is an optional developer step. From the Developers page, create an API key and export a credentials.json — this bundles your API key together with your private decryption key. From there you can:

  • Run the CLI: openbanking accounts, openbanking transactions, or openbanking sync.
  • Call the REST API or an SDK, passing your key in the X-Api-Key header.

Every response is ciphertext until it is decrypted locally with your private key. That is the heart of the zero-knowledge design: open-banking.io's servers store only your public key and can never read your financial data. The CLI and SDK only read and sync connections you have already approved — they cannot create one.

All of this runs for around EUR 3 per month, with no certificates to buy or maintain.

Does open-banking.io ever see my Sparkasse Duisburg data?

No. Data is decrypted on your device with a key only you hold. The servers keep just your public key, so stored data stays unreadable to anyone else.

Can I connect Sparkasse Duisburg with the CLI or an API key?

No. Connecting is a dashboard-only flow that ends on the bank's consent screen. The CLI, SDK, and API keys only read or sync accounts you have already linked.

How long does access last?

Sparkasse Duisburg grants consent for up to 180 days. When it expires, reconfirm on the bank's login screen to keep syncing.

Ready to begin? Visit open-banking.io.