Frankfurter Sparkasse API Access & Open Banking Data

Pulling your Frankfurter Sparkasse balances and transactions into your own tools shouldn't mean juggling eIDAS certificates, sandbox registrations or a bank-specific PSD2 portal. open-banking.io gives you one consistent path to Frankfurter Sparkasse data (BIC HELADEF1822) across both business and personal accounts, and it does the hardest part — cryptography — on your own device. The service already reaches 2,600+ EU and UK banks, so once you learn the flow for Frankfurter Sparkasse, every other institution works the same way.

The design is deliberately zero-knowledge and certificate-free. Your encryption keys are generated locally from a passphrase you choose, and open-banking.io only ever holds your public key. That means the servers relay ciphertext they cannot read — decryption happens exclusively on your machine.

How to connect Frankfurter Sparkasse

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

  1. Sign up for open-banking.io and set your encryption passphrase. Your private key is created on your own device and never leaves it.
  2. In the dashboard, search for Frankfurter Sparkasse and choose the account type you need — business or personal.
  3. You're redirected to Frankfurter Sparkasse's own secure login, where you approve access under PSD2. Consent lasts up to 180 days, after which you simply re-approve.
  4. Your selected accounts sync back into the dashboard, ready to view.

Access your data

Reading the data programmatically is an optional step you take after the connection exists. On the Developers page, create an API key and export a credentials.json — this 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 authenticate with the X-Api-Key header, and every response is decrypted locally with your key. An API key on its own returns only ciphertext, so nobody — not even open-banking.io — can read your Frankfurter Sparkasse data without the private key you hold.

All of this runs at roughly EUR 3/month, with no per-bank certificate fees.

Do I need a developer account to connect Frankfurter Sparkasse?

No. Connecting is done in the dashboard by approving access on Frankfurter Sparkasse's login. API keys are only for optional programmatic reads later.

Can open-banking.io see my Frankfurter Sparkasse transactions?

No. It stores only your public key and relays encrypted data; decryption happens on your device.

How long does access to Frankfurter Sparkasse last?

Up to 180 days per PSD2 consent, then you re-approve from the dashboard.

Start at open-banking.io.