Volksbank Sulmtal API Access & Open Banking Data

Volksbank Sulmtal is a Baden-Württemberg cooperative bank, and open-banking.io lets you reach its account data through a single privacy-first subscription. Instead of chasing eIDAS certificates or building a PSD2 stack, you get read access to balances and transactions from Volksbank Sulmtal (BIC GENODES1VOS) alongside 2,600+ other EU and UK banks. Both business and personal accounts are supported, and every consent you grant lasts up to 180 days before a quick renewal.

The core idea is zero-knowledge. Encryption keys are generated on your own device, so open-banking.io stores only your public key and never sees your statements in the clear. Your data is decrypted locally, by you.

How to connect Volksbank Sulmtal

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 private key is created locally and never leaves your device.
  2. In the dashboard, search for Volksbank Sulmtal and choose the account type you hold — business or personal.
  3. You are redirected to Volksbank Sulmtal's own secure login, where you approve access under PSD2 (a consent valid for up to 180 days).
  4. Your approved accounts sync straight back into the dashboard, ready to view.

That is the whole flow. You never hand your banking credentials to open-banking.io — approval takes place on the bank's screen.

Access your data

Once Volksbank Sulmtal is connected, developers can optionally read the data programmatically. Open the Developers page, create an API key, and export a credentials.json bundle — this pairs your API key with your private decryption key. From there use the CLI (openbanking accounts, openbanking transactions, openbanking sync), an SDK, or the REST API. Requests carry the X-Api-Key header, and every response is decrypted locally with your own key, so a leaked API key alone only ever yields ciphertext. The CLI and SDK read and sync existing connections; they never connect a bank themselves.

All of this runs for about EUR 3/month, certificate-free.

Does open-banking.io see my Volksbank Sulmtal statements?

No. It holds only your public key. Data is encrypted for you and decrypted on your device, so the service cannot read it.

Do I need a developer account to connect?

No. Connecting is done in the dashboard by any user. The API key and credentials.json are only for the optional programmatic step afterwards.

How long does access last?

Each PSD2 consent with Volksbank Sulmtal is valid for up to 180 days, after which you re-approve in a few clicks.

Ready to begin? Visit open-banking.io and connect Volksbank Sulmtal today.