Not OP, but my (German) bank supports the Digitales Bezahlen App with GrapheneOS. I used it exactly twice, both times because I forgot my wallet at home.

There are several supported apps, such as Curve Pay, PayPal, and banking apps that have their own tap-to-pay implementation.

https://shkspr.mobi/blog/2025/06/contactless-payments-with-grapheneos/

https://grapheneos.social/@GrapheneOS/115295538501760765

You can also use the contactless payments supported tag when searching the GrapheneOS banking app compatibility list on GitHub. https://github.com/PrivSec-dev/banking-apps-compat-report/issues?q=is%3Aissue+label%3A"contactless+payments+supported"

I’m in the UK and use Curve. I’ve used it locally, of course, but also in Singapore, Australia and Japan and it worked without incident.

I’m in the UK and use Curve. I’ve used it locally, of course, but also in Singapore, Australia and Japan and it worked without incident.