Mendener Bank Open Banking & Secure API Access

Mendener Bank eG (BIC GENODEM1MEN) is a cooperative bank rooted in Menden and the Sauerland region. With open-banking.io you can reach both business and personal accounts held there through a single, PSD2-compliant workflow — no eIDAS certificate, no bank-specific integration, and no raw credentials ever leaving your device. Your data is decrypted locally with a key that only you hold, so open-banking.io's servers see ciphertext and nothing else.

The service already covers 2,600+ EU and UK banks for roughly EUR 3 per month, and Mendener Bank is one of them. Here is how the flow actually works.

How to connect Mendener Bank

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 an open-banking.io account.
  2. Set an encryption passphrase. Your encryption keys are generated right there on your own device, which is what makes the service zero-knowledge.
  3. In the dashboard, search for and select Mendener Bank, then choose the account type you need — business or personal.
  4. You are redirected to Mendener Bank's own secure login, where you approve access on the bank's PSD2 consent screen. A single consent stays valid for up to 180 days before you renew it.
  5. Your selected accounts sync back into the dashboard, ready to view.

Because you approve directly on the bank's site, open-banking.io never handles your online-banking password.

Access your data

Reading Mendener Bank data programmatically is an optional step for developers, available only after the connection above exists. 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. Requests authenticate with the X-Api-Key header, and every response is decrypted locally with your own key. The CLI and SDK only read or refresh connections that already exist — there is no connect command. Note that an API key alone returns only ciphertext; without your private key, the payload stays unreadable.

FAQ

Can I connect Mendener Bank without a certificate?

Yes. open-banking.io is certificate-free — no eIDAS or QWAC setup. You approve access on Mendener Bank's own consent screen and your accounts sync in.

Does open-banking.io see my Mendener Bank data?

No. It is zero-knowledge and stores only your public key. Data is decrypted on your device with a private key that never leaves it.

How long does access last?

A Mendener Bank consent is valid for up to 180 days, after which you re-approve to keep syncing.

Start at open-banking.io.