Wiki · index
The catalogue.
Three collections, one method. Browse the standards from A to Z, start with a country and follow the schemes it operates, or open a wallet to see which standards it supports. Every entry on every page is a single markdown file under content/ in the source repo.
THE COLLECTIONS
01
Standards
Every QR, barcode and visual-code specification we have evidence for — EMV merchant-presented modes, national instant-payment QRs, retail GS1 codes, transit codes.
A→Z · 477 entries →02
Payments
One page per country, listing the schemes that operate there, the visual codes those schemes use, and how interoperability works at the merchant counter.
A→Z · 197 entries →03
Wallets
Cross-cutting matrices for multi-region wallets like Revolut and Wise — what each supports, where, and against which underlying standard.
1081 entries →THE METHOD
Reproducible
from source.
The wiki is read-only for the moment. Writing, editing and re-extracting happen upstream in reports/ and are replayed into content/ by the skills under .claude/skills/.
Every page on this site is reproducible from a single reviewable change in the source repository. There is no hidden editor state, no admin panel, no production-only edits. If you can read this, you can read the source.