M.M. Warburg & CO Open Banking and API Access

M.M. Warburg & CO is a long-established Hamburg private bank, and open-banking.io lets you reach its account data without certificates, screen-scraping, or a bespoke bank integration. Under PSD2, both business and personal M.M. Warburg & CO accounts can be linked and kept in sync, so balances and transactions flow into one dashboard you control. Everything is decrypted locally with a key that never leaves your device — open-banking.io stores only your public key and can never read your figures.

How to connect M.M. Warburg & CO

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 key pair is generated right there on your own device.
  2. In the dashboard, search for M.M. Warburg & CO (BIC WBWCDEHHXXX) and choose the account type you need — business or personal.
  3. You are redirected to M.M. Warburg & CO's own secure login, where you approve access on the bank's PSD2 consent screen.
  4. Your accounts sync back into the dashboard. Consent lasts up to 180 days, after which you simply reapprove on the bank's screen.

Because approval always takes place on M.M. Warburg & CO's own pages, your banking credentials are never seen or handled by open-banking.io.

Access your data

Reading the data programmatically is an optional developer step you take after the connection exists. Open 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 use the CLI (openbanking accounts, openbanking transactions, openbanking sync), an SDK, or the REST API. Every request carries your key in the X-Api-Key header, and each response is decrypted locally with your private key. An API key on its own only ever returns ciphertext, so the raw data stays useless to anyone but you.

At around EUR 3 per month, this covers a network of 2,600+ EU and UK banks under the same zero-knowledge, certificate-free model.

Can I connect M.M. Warburg & CO with an API key?

No. Bank connections are made only in the dashboard, where you approve on M.M. Warburg & CO's consent screen. The API and CLI just read connections you already have.

M.M. Warburg & CO grants access for up to 180 days per approval. When it lapses, reauthorize on the bank's login to keep your data syncing.

Can open-banking.io see my M.M. Warburg & CO balances?

No. Decryption uses a key held only on your device, so the service holds ciphertext and your public key alone.

Ready to start? Visit open-banking.io.