Kreissparkasse Mayen API Access & Open Banking

Reaching your Kreissparkasse Mayen account data no longer means wrestling with eIDAS certificates or a PSD2 licence. open-banking.io is a certificate-free bridge to more than 2,600 European banks, and Kreissparkasse Mayen (BIC MALADE51MYN) is one of them. It is built to be zero-knowledge: your account information is decrypted on your own device with a key that never leaves it, so the service itself only ever holds ciphertext and your public key.

The bank supports both business and personal account access, and a single approval keeps your connection live for up to 180 days before Kreissparkasse Mayen asks you to renew consent.

How to connect Kreissparkasse Mayen

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

  1. Sign up for open-banking.io and set your encryption passphrase. Your cryptographic keys are generated locally on your device at this moment.
  2. In the dashboard, choose Kreissparkasse Mayen from the bank list and pick the account type you want to link — business or personal.
  3. You are redirected to Kreissparkasse Mayen's own secure login, where you approve access under PSD2 consent. Your credentials go only to the bank.
  4. Once approved, your accounts and transactions sync back into your open-banking.io dashboard, ready to view.

Access your data

Want to work with the data programmatically? That is an optional developer step you take after the connection above exists. Open the Developers page, create an API key, and export a credentials.json — it bundles that API key together with your private decryption key. From there the CLI (openbanking accounts, openbanking transactions, openbanking sync), the SDKs and the REST API all read your already-linked Kreissparkasse Mayen accounts. Requests authenticate with the X-Api-Key header, and every response is decrypted locally with your own key. Note that the CLI and SDK only read and sync existing connections — there is no connect command, because linking a bank always happens in the dashboard. An API key on its own returns only ciphertext; without your private key, nobody — not even open-banking.io — can read it.

All of this runs for roughly EUR 3 per month.

Is Kreissparkasse Mayen business banking supported?

Yes. Both business and personal Kreissparkasse Mayen accounts can be linked and synced.

Up to 180 days. After that Kreissparkasse Mayen prompts you to re-approve access through its own login.

Can open-banking.io read my transactions?

No. The platform is zero-knowledge — it stores only your public key, and your data is decrypted solely on your device.

Start at open-banking.io.