THE PAYMENTS TRACE SEARCH/
LATEST ANALYSIS / OPEN BANKING

Visa is selling the rulebook without the rail.

Visa’s UK account-to-account product is the card rulebook detached from the card rail. The public rails wrote rules for fraud but not for commerce, and the UK is now pricing three answers to who pays for the rest.

Read the analysis 11 SEP 2026 · 16 MIN READ
AN ESSAY ON MONEY / THE LONG TRACE

Money began as a ledger. It is becoming one again.

A 5,400-year history of how value moves, told in eight eras, with an argument that the card era, and not account-to-account, is the anomaly.

Engraved illustration: a worn footpath and a new paved road running side by side toward the open gate of a walled town.

The architect behind the Trace

Portrait of Vishwanath Callikan

By day, I am the Lead Enterprise Architect for Digital Payment Methods, at Global Payments.

By night, I write to think more clearly about how the world pays, how money moves, and the multi-sided nature of payments and commerce.

What ends up on the page is not a reaction to the latest headlines. It is a considered architectural view of the implications beneath them, for digital payment methods, strategy and the evolution of payments.

If you’re curious, find out more about me here.

These are just some of the payment methods I have had the pleasure of working on.
Click any logo below to find out more.