Sparkasse Lemgo API Access & Open Banking Data
Pulling your Sparkasse Lemgo balances and transactions into your own tools shouldn't mean eIDAS certificates, screen-scraping, or handing a third party the keys to your finances. open-banking.io gives you regulated PSD2 access to Sparkasse Lemgo (BIC WELADED1LEM) across both business and personal accounts, with data that is encrypted on your device and decrypted only by you.
The service already reaches 2,600+ banks across the EU and UK, so once Sparkasse Lemgo is linked you can manage it alongside every other account from a single dashboard — no bank-specific integration work required.
How to connect Sparkasse Lemgo
Connecting happens entirely inside the open-banking.io dashboard — there is no API call, code, or key involved in linking an account:
- Sign up for open-banking.io and open the web dashboard.
- Set your encryption passphrase. Your key pair is generated locally on your own device; open-banking.io only ever stores your public key.
- Pick Sparkasse Lemgo in the dashboard and choose the account type you want to link — business or personal.
- Approve on Sparkasse Lemgo's own login. You are redirected to the bank's secure PSD2 consent screen, where you authenticate directly with Sparkasse Lemgo and grant access for up to 180 days.
- Your accounts sync back into the dashboard, and balances and transactions appear automatically.
When the 180-day consent window lapses, you simply re-approve on the bank's screen to keep the connection live.
Access your data
Want your Sparkasse Lemgo data in code? That's an optional developer step after the account is connected. From the Developers page, create an API key and export a credentials.json — this bundles the API key together with your private decryption key. Then 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. Without that private key, an API key alone returns only ciphertext.
The CLI and SDK read and sync existing connections — they never create them, since linking always goes through the dashboard consent flow above.
All of this runs certificate-free for around EUR 3/month, with genuine zero-knowledge privacy: the servers hold your public key and encrypted blobs, never anything they can read.
Does open-banking.io see my Sparkasse Lemgo login or data?
No. You authenticate on Sparkasse Lemgo's own site, and your data is decrypted only on your device with a key that never leaves it.
Which Sparkasse Lemgo accounts are supported?
Both business and personal accounts (BIC WELADED1LEM) can be linked and synced.
How long does access last?
Up to 180 days per PSD2 consent, after which you re-approve on the bank's screen.
Ready to start? Visit open-banking.io.