Sparkasse Mülheim a.d. Ruhr API & Open Banking Access

Pulling live account data out of Sparkasse Mülheim a.d. Ruhr usually means wrestling with certificates, sandbox registrations and PSD2 paperwork. open-banking.io removes all of that. It is a zero-knowledge aggregation service covering 2,600+ banks across the EU and UK, and it lets you reach your Sparkasse Mülheim a.d. Ruhr balances and transactions without ever handing readable data to a third party. Everything is decrypted on your own device with a key only you hold.

Sparkasse Mülheim a.d. Ruhr is identified by BIC SPMHDE3EXXX, and open-banking.io supports both business and personal accounts. A single approval keeps your data flowing for up to 180 days before you re-confirm.

How to connect Sparkasse Mülheim a.d. Ruhr

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 key pair is generated locally, so only your public key ever leaves your device.
  2. In the dashboard, search for Sparkasse Mülheim a.d. Ruhr and choose the account type you want to link (business or personal).
  3. You are redirected to Sparkasse Mülheim a.d. Ruhr's own secure login, where you authenticate and approve access under PSD2 consent.
  4. Once approved, your accounts sync straight into your dashboard, ready to view.

That is the whole flow. You approve access on the bank's screen, never by exposing credentials to open-banking.io.

Access your data

Want to read the data programmatically? That is an optional developer step, done only after the connection exists. On the Developers page, create an API key and export a credentials.json — it bundles the API key together with your private decryption key. From there use the CLI (openbanking accounts, openbanking transactions, openbanking sync), an SDK, or the REST API. Requests carry your key in the X-Api-Key header, and every response is decrypted locally with your private key. The CLI and SDK only read and sync connections you already made in the dashboard.

Because the service is zero-knowledge and certificate-free, open-banking.io stores only ciphertext — an API key alone returns unreadable data without your key. All of this runs for roughly EUR 3/month.

FAQ

Do I need a developer account to connect Sparkasse Mülheim a.d. Ruhr?

No. Connecting is done in the dashboard by approving access on the bank's login page. API keys are only for reading data afterwards.

Can open-banking.io see my Sparkasse Mülheim a.d. Ruhr transactions?

No. It holds only your public key and stores encrypted data. Decryption happens on your device with a key only you control.

Up to 180 days, after which Sparkasse Mülheim a.d. Ruhr asks you to re-approve access.

Start at open-banking.io.