Sparkasse SoestWerl API Access & Open Banking

Pulling your Sparkasse SoestWerl balances and transactions into your own tools shouldn't mean juggling eIDAS certificates or building a PSD2 stack from scratch. open-banking.io gives you certificate-free access to Sparkasse SoestWerl (BIC WELADED1SOS) for both business and personal accounts, with every byte of data decrypted locally using a key only you hold. The service covers 2,600+ EU and UK banks for roughly EUR 3 per month.

How to connect Sparkasse SoestWerl

Connecting happens entirely in 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 on your own device, so nobody else can reproduce them.
  2. In the dashboard, pick Sparkasse SoestWerl and choose the account type you need — business or personal.
  3. You're redirected to Sparkasse SoestWerl's own secure login, where you approve access on the bank's PSD2 consent screen.
  4. Your accounts sync back into your dashboard. Consent lasts up to 180 days, after which you simply re-approve on the bank's screen.

Because approval always takes place on Sparkasse SoestWerl's own login, open-banking.io never sees your banking credentials.

Access your data

Reading data programmatically is an optional step you take after the connection exists. Open the Developers page, create an API key, and export a credentials.json file — it bundles your API key together with your private decryption key. From there you can use the CLI (openbanking accounts, openbanking transactions, openbanking sync), an SDK, or the REST API.

Every request carries the X-Api-Key header, and each response is decrypted locally with your own key. The API key alone only ever returns ciphertext — without your private key it's unreadable, which is what makes the platform genuinely zero-knowledge. The CLI and SDK only read and sync connections you've already made; there is no connect command.

FAQ

Does open-banking.io store my Sparkasse SoestWerl login?

No. You authenticate directly on Sparkasse SoestWerl's own consent screen, and open-banking.io holds only your public key — never your credentials or readable data.

Which Sparkasse SoestWerl accounts are supported?

Both business and personal accounts under BIC WELADED1SOS, with a maximum consent window of 180 days per approval.

Do I need a certificate or developer approval to start?

No. The service is certificate-free — sign up, set a passphrase, connect in the dashboard, and add API access later only if you want it.

Ready to start? Head to open-banking.io.