NK Nyckeln Mastercard API Access — Open Banking

Pulling clean, structured data out of your NK Nyckeln Mastercard no longer means scraping statements or wrestling with bank certificates. open-banking.io gives developers, fintechs and finance teams a single programmatic doorway to Nordiska Kompaniet's loyalty Mastercard, letting you sync card data in near real time and fold it straight into your own product, ledger or analytics stack.

The card is offered by NK (issued via SEB Kort) to personal cardholders in Sweden, and our unified API surfaces its data the same way it surfaces 2,600+ other banks across Europe and the UK — one integration, one contract, one mental model.

How to connect NK Nyckeln Mastercard

  1. Create an open-banking.io account and generate your API keys.
  2. Call the endpoint list and select NK Nyckeln Mastercard as the institution.
  3. Redirect the cardholder to authenticate through NK's own secure login.
  4. Receive the consent token and start requesting data immediately.

No eIDAS certificate, no per-bank onboarding paperwork, no sandbox scavenger hunt — the same request pattern works whether you connect one card or every institution we cover.

What data you can access

  • Accounts — personal card account identifiers and metadata
  • Balances — current and available amounts
  • Transactions — historical and incoming postings with merchant and amount detail

NK Nyckeln Mastercard supports personal account access. A single consent stays valid for up to 180 days before the cardholder needs to re-authenticate, so recurring syncs run without constant friction. No BIC is published for this card programme, and none is required to connect through us.

Privacy by design

open-banking.io is zero-knowledge: data flows through to you, not into a data lake we mine. Because the platform is certificate-free, you skip the cost and delay of QWAC/QSEAL provisioning entirely. Authentication always happens on NK's side — we never see or store cardholder credentials.

Pricing

One flat subscription of roughly EUR 3 per month covers access, with no per-call surprises and no separate fee per bank. Scale from a prototype to production on the same plan.

FAQ

Do I need a banking licence or certificate to use this?

No. open-banking.io is certificate-free and handles the regulated connectivity, so you integrate with standard API keys.

How often can I refresh NK Nyckeln Mastercard data?

As often as your use case needs within an active consent window — that window lasts up to 180 days before re-authentication.

Is my customers' card data stored by open-banking.io?

No. Our zero-knowledge design passes data to your application without retaining it for our own use.

Ready to build? Start at open-banking.io.