Sparkasse Arnsberg-Sundern API Access & Open Banking

Reaching account data at Sparkasse Arnsberg-Sundern (BIC WELADED1ARN) no longer means wrestling with bank certificates or an eIDAS setup. open-banking.io gives you a single, private path to your Sparkasse Arnsberg-Sundern balances and transactions across both business and personal accounts, with everything decrypted on your own device using a key only you hold.

The service covers 2,600+ banks EU-wide and works the same way for each: you approve access on your bank's own login screen, and your accounts flow into a dashboard you control. No QWAC or QSEAL certificate is ever required from you.

How to connect Sparkasse Arnsberg-Sundern

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 keys are generated locally on your device, so open-banking.io only ever holds your public key.
  2. In the dashboard, pick Sparkasse Arnsberg-Sundern and choose the account type — business or personal.
  3. You are redirected to Sparkasse Arnsberg-Sundern's own secure login to approve access under PSD2. Your bank grants consent for up to 180 days before you re-authorise.
  4. Your accounts sync back into your dashboard, ready to view.

Access your data

Once the connection exists, developers can optionally read it programmatically. 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 own key. Note the CLI and SDK only read and sync connections that already exist — the actual linking is always done in the dashboard.

Because the architecture is zero-knowledge, open-banking.io servers store ciphertext they cannot read. Access to Sparkasse Arnsberg-Sundern data runs about EUR 3/month, certificate-free.

Do I need an eIDAS certificate for Sparkasse Arnsberg-Sundern?

No. You authorise directly on Sparkasse Arnsberg-Sundern's consent screen, so no certificate or bank-specific credential is needed from you.

Can I connect a Sparkasse Arnsberg-Sundern business account?

Yes. Both business and personal account types are supported; you select which during the dashboard connect flow.

Can open-banking.io read my Sparkasse Arnsberg-Sundern transactions?

No. Data is encrypted with a key held only on your device. Even an API key alone returns ciphertext without your private decryption key.

Start at open-banking.io.