Sparkasse Mittelholstein open banking & API access

Sparkasse Mittelholstein Aktiengesellschaft, the free savings bank based in Rendsburg (BIC NOLADE21RDB), keeps its account data behind its own secure PSD2 interface. open-banking.io gives you a single, private way to reach both your business and personal balances and transactions — without certificates, TPP registration, or handing your data to a third party. Everything is decrypted locally with a key only you hold, so open-banking.io never sees your statements in the clear.

How to connect Sparkasse Mittelholstein Aktiengesellschaft

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

  1. Sign up at open-banking.io and set your encryption passphrase. Your keys are generated on your own device.
  2. In the dashboard, pick Sparkasse Mittelholstein Aktiengesellschaft and choose the account type (business or personal).
  3. You're redirected to Sparkasse Mittelholstein's own secure login, where you approve access on the bank's consent screen.
  4. Your accounts sync back into your dashboard. Consent lasts up to 180 days, after which you simply re-approve.

That's it — your data flows in, encrypted end to end.

Access your data

Reading data programmatically is an optional step after connecting. On the Developers page, create an API key and export a credentials.json — this bundles the API key and your private decryption key. From there 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 CLI and SDK only read and sync existing connections; they never connect a bank.

Because open-banking.io is zero-knowledge, its servers hold only your public key — an API key alone returns ciphertext until your private key decrypts it on your machine.

Pricing is around EUR 3/month, flat, with no per-bank fees.

FAQ

Do I need a developer account to connect Sparkasse Mittelholstein?

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

Can open-banking.io read my Sparkasse Mittelholstein transactions?

No. Data is decrypted only on your device with your private key. The service stores just your public key and encrypted blobs.

Which account types are supported?

Both business and personal accounts at Sparkasse Mittelholstein Aktiengesellschaft, each with consent valid up to 180 days.

Start at https://open-banking.io.