Euros as one more wallet

A wallet built for one currency

The wallet held one currency, and everything about it was built on that assumption: one balance, one amount field, one set of rails. Adding euros meant every money surface suddenly had to answer “which currency is this?”, on mobile and desktop, when adding, withdrawing and converting. Euros were a strategic bet for Airtm: EURC, the euro stablecoin, opens a large market the dollar wallet did not serve, and demand was already coming from it.

North starA second currency should give people more options without asking them a new question.

The rails differ by currency (euros leave over SEPA, dollars do not), so the flows could not be made identical. The naming was settled product-wide: users see USDC and EURC, never internal or legacy labels. And the second currency could not earn its own app: the same screens had to carry both, for people who would only ever hold one of them.

A currency switch on the balance: one control, two states, everything below it reacting. It demos well, and I built one to be sure. But it broke the north star: it asked a new question, “which currency?”, before every task, when the person already knows which money they are moving. It also made the two currencies compete for the same space and hid half of your money behind a control you have to notice.

Euros joined the carousel the home already had, with the same Add, Withdraw and Convert as dollars. The pill at the top became the total of every wallet, and a tap opens a sheet that lists each one in its own currency. Every card opens the same wallet page, for dollars and for euros. And Convert puts the rate on screen before the amount. The before and after just below shows each change, and the tour above lets you try it.

The sheet lists the wallets, and nothing on the home weighs one currency against the other, because that is not a question the product should pose during a transfer. Someone who wants to compare reads two rows. I took that trade deliberately: fewer people lost in the flow is worth more than a feature for the few who are optimising.

Shipped

The EURC card, the total and its sheet, the wallet pages and Convert are live in the Airtm app, as rebuilt above. I checked them in September 2026, and Airtm’s help center describes the euro balance.

Patterns

The app had no interaction patterns for holding more than one currency. I wrote them, they outlived the feature, and other teams reused the components on their own surfaces.

Metrics

The PM and I set three success metrics at the start. First, whether people who receive euros find them without contacting support. Second, whether euros get used and not only held, counted as conversions started from the EURC wallet. Third, whether a conversion that starts gets finished, measured between the amount and the confirmation. Airtm owns the figures, so I leave the numbers to them.

Also in build

My designs for withdrawing euros and for recovering from a short balance went into build too, with engineering never blocked on design. Before build, the work went through design reviews with the design team and a review with stakeholders.

I designed the pattern so the next currency fits too: a card in the carousel, a line in the total’s sheet, a page of its own. Adding a wallet is now a matter of filling those three places.