Crédit maritime Mutuel Grand Ouest Open Banking API Access

Reach your Crédit maritime Mutuel Grand Ouest accounts without certificates, sponsor banks, or a PSD2 licence of your own. open-banking.io is a zero-knowledge service covering 2,600+ banks across the EU and UK, and it treats this Brittany-based mutual maritime bank (BIC CCBPFRPPNAN) like any other supported institution. Both business and personal accounts are eligible, and each authorisation stays valid for up to 180 days before you re-approve.

The important detail: your statements and balances are decrypted on your own device with a key only you hold. open-banking.io's servers keep your public key and encrypted blobs — nothing they can read.

How to connect Crédit maritime Mutuel Grand Ouest

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

  1. Create your open-banking.io account and set an encryption passphrase. Your key pair is generated locally at that moment.
  2. In the dashboard, search for Crédit maritime Mutuel Grand Ouest and choose the account type — business or personal.
  3. You are redirected to Crédit maritime Mutuel Grand Ouest's own secure login, where you approve the PSD2 consent directly with the bank.
  4. Once approved, your accounts sync back into the dashboard and refresh automatically within the 180-day window.

You never hand credentials to open-banking.io — the approval lives on the bank's screen.

Access your data

Programmatic access is an optional step that comes after the connection exists. On the Developers page, generate an API key and export a credentials.json bundling that key with your private decryption key. Then read whatever is already linked:

openbanking accounts
openbanking transactions
openbanking sync

Requests send the X-Api-Key header, and every response is decrypted locally with your private key. There is no connect command — the CLI, SDKs, and REST API only read and sync existing links. An API key on its own returns ciphertext until your key unlocks it.

Is a developer account required to view balances?

No. The dashboard shows everything after you approve consent. API keys are only for automation.

Can open-banking.io staff see my Crédit maritime Mutuel Grand Ouest transactions?

No. The architecture is zero-knowledge — they store only your public key and encrypted data.

How much does it cost?

Around EUR 3/month for full access across every supported bank.

Start at https://open-banking.io.