Sparkasse Hannover API Access & Open Banking

Pulling balances and transactions out of Sparkasse Hannover (BIC SPKHDE2HXXX) usually means wrestling with certificates and a PSD2 developer sandbox. open-banking.io removes all of that. It links your Sparkasse Hannover business or personal accounts through the regulated open-banking framework, then decrypts everything on your own device — the service never holds a key that can read your data. No eIDAS certificate, no bank-specific onboarding, one flat subscription of roughly EUR 3/month across 2,600+ European banks.

How to connect Sparkasse Hannover

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

  1. Sign up for open-banking.io and set an encryption passphrase. Your key pair is generated locally on your device; only your public key ever leaves it.
  2. In the dashboard, choose Sparkasse Hannover and pick the account type you hold — business or personal.
  3. You're redirected to Sparkasse Hannover's own secure login, where you approve access using your normal online-banking credentials (standard PSD2 consent).
  4. Your accounts sync back into the dashboard. Consent lasts up to 180 days, after which you simply re-approve on the bank's screen.

That's it — Sparkasse Hannover authenticates you directly, so open-banking.io never sees your banking password.

Access your data

Once your accounts are connected, developers can optionally read them programmatically. On the Developers page, create an API key and export a credentials.json — this bundles the 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 authenticate with the X-Api-Key header, and every response is decrypted locally with your own key. The API key alone only ever returns ciphertext — without your private key, the data stays unreadable, which is what makes the platform zero-knowledge. The CLI and SDK read and sync existing connections; they don't create new ones (that's always the dashboard flow above).

FAQ

Do I need an eIDAS certificate to access Sparkasse Hannover?

No. open-banking.io is certificate-free — you authorise access directly on Sparkasse Hannover's login screen, with no developer certificate to register.

Can open-banking.io read my Sparkasse Hannover data?

No. The service stores only your public key and holds your account data encrypted. Decryption happens on your device with a private key that never leaves it.

Up to 180 days per approval. When it expires, re-authorise in a few clicks on the bank's own consent screen.

Ready to start? Connect Sparkasse Hannover at https://open-banking.io.