Sparkasse HagenHerdecke API Access & Open Banking

Pulling your Sparkasse HagenHerdecke balances and transactions into your own tools shouldn't mean wrestling with eIDAS certificates or a bank sandbox. open-banking.io gives you PSD2 access to Sparkasse HagenHerdecke (BIC WELADE3HXXX) across both business and personal accounts, with every byte decrypted on your own device using a key only you hold. It covers 2,600+ EU and UK banks, so HagenHerdecke sits alongside whatever else you bank with.

How to connect Sparkasse HagenHerdecke

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, never on the server.
  2. In the dashboard, search for Sparkasse HagenHerdecke and choose the account type you need — business or personal.
  3. You are redirected to Sparkasse HagenHerdecke's own secure login, where you approve access on the bank's PSD2 consent screen. A consent lasts up to 180 days before you renew it.
  4. Your approved accounts sync back into your dashboard, ready to view.

Because you authenticate directly with the bank, open-banking.io never sees your Sparkasse HagenHerdecke credentials.

Access your data

Once a 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 you can use the CLI (openbanking accounts, openbanking transactions, openbanking sync), an SDK, or the REST API directly. Requests carry your key in the X-Api-Key header, and each response is decrypted locally with your private key. The CLI and SDK only read and sync existing connections — they never create them.

Without your private key, an API key alone returns only ciphertext. open-banking.io is zero-knowledge and certificate-free: its servers store just your public key and can never read or decrypt your Sparkasse HagenHerdecke data. All of this runs for about EUR 3 per month.

Do I need an eIDAS certificate?

No. open-banking.io handles the regulated PSD2 layer, so you connect Sparkasse HagenHerdecke with no certificate and no bank-developer registration.

Can I access business and personal accounts?

Yes. Sparkasse HagenHerdecke supports both business and personal account types through open-banking.io.

How often do I re-approve access?

Sparkasse HagenHerdecke consents run up to 180 days. When one expires, you re-approve on the bank's consent screen from your dashboard.

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