Bankhaus Gebr. Martin API Access & Open Banking

Reach your Bankhaus Gebr. Martin accounts through a single, privacy-first open-banking layer. open-banking.io links to this Göppingen private bank (BIC MARBDE6GXXX) under PSD2, covering both business and personal accounts, so balances and transactions land in one dashboard without paperwork, eIDAS certificates, or a bank sponsorship agreement. Everything you sync is encrypted on your own device with a key only you hold.

How to connect Bankhaus Gebr. Martin

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 an encryption passphrase. Your cryptographic keys are generated locally, so the service only ever sees your public key.
  2. In the dashboard, search for and select Bankhaus Gebr. Martin, then choose the account type you need — business or personal.
  3. You are redirected to Bankhaus Gebr. Martin's own secure login, where you approve access (the standard PSD2 consent). Consent lasts up to 180 days before a quick re-approval is needed.
  4. Your accounts sync back into the dashboard, ready to view.

Access your data

Programmatic access is an optional step after the connection exists. On the Developers page, create an API key and export a credentials.json bundling that key with your private decryption key. Then read your data with 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 existing connections; they never create one.

Because open-banking.io is zero-knowledge, its servers hold only ciphertext and your public key. An API key alone returns encrypted data; without your private key it stays unreadable. All this runs for about EUR 3/month, with no certificates to buy or renew.

FAQ

Does open-banking.io support Bankhaus Gebr. Martin business accounts?

Yes. Both business and personal Bankhaus Gebr. Martin accounts (BIC MARBDE6GXXX) can be connected and synced.

Do I need an API key to connect Bankhaus Gebr. Martin?

No. Connecting is done in the dashboard via Bankhaus Gebr. Martin's own consent screen. API keys are only for optionally reading data afterward.

Up to 180 days per PSD2 rules, after which you re-approve access on the bank's login page.

Start at open-banking.io.