BiG API Access — Connect Banco BiG Spain Data

Pulling live data out of Banco BiG in Spain no longer means wrestling with eIDAS certificates or bank-specific portals. open-banking.io gives you a single, PSD2-compliant endpoint to read your BiG accounts, keep balances current and stream transaction history straight into your own tools, spreadsheets or product. You authorise once through BiG's own login, and the connection stays in sync from there.

How to connect BiG

1. Create your open-banking.io account and select Banco BiG (Spain) from the institution list.
2. Choose the account type you want to link — business or personal.
3. Get redirected to BiG's secure authentication to approve the read-only consent.
4. Land back at open-banking.io with your accounts already resolving.
5. Call the unified REST API — or use a ready-made integration — to fetch data on demand.

What data you can access

• Accounts — identifiers, currency, product type and BIC (IGSEESMMXXX) for each linked BiG account.
• Balances — real-time available and booked balances, refreshed on request.
• Transactions — dated, categorised movements with counterparties and reference details for reconciliation, analytics or bookkeeping.

Consent and coverage

BiG consent runs for up to 180 days before a quick re-authorisation is needed, and both business and personal accounts are supported. The same open-banking.io API reaches 2,600+ banks across the EU and UK, so adding another institution later is just another selection — no new integration.

Privacy by design

The platform is zero-knowledge: your BiG credentials are entered only at the bank and are never seen or stored by us. There are no eIDAS or QWAC certificates to buy, renew or manage — access rides entirely on the regulated open-banking rails, so you skip the usual compliance overhead.

Pricing

One flat plan from around EUR 3 per month covers BiG and every other supported bank, with no per-connection surcharges and no setup fee.

FAQ

Do I need a certificate to connect BiG?

No. open-banking.io is certificate-free — you authenticate directly with BiG and we handle the regulated connection, so there is nothing to purchase or install.

Can I link both business and personal BiG accounts?

Yes. Both account types are supported; link them under one open-banking.io login and query each through the same API.

How long does a BiG connection last?

Each consent is valid for up to 180 days. When it approaches expiry, a short re-authorisation with BiG renews read access.

Ready to start syncing BiG data? Visit open-banking.io.