Adding stablecoin wallets to your fintech app: a practical guide

On Freedom Pro, a member’s account carries a dollar balance and a stablecoin balance, and a debit card spends from it. The wallets and the cards come from Bridge, a stablecoin infrastructure provider, through its API; we built the product around them.

That partner-first model is the one we recommend to any fintech product adding stablecoin wallets. It keeps the regulated work with a licensed provider and leaves you the parts users see: onboarding, the ledger and the interface.

The building blocks

• Custody and wallet infrastructure from a regulated provider.
• On- and off-ramps between bank dollars and stablecoins.
• Card issuing so balances can be spent anywhere.
• KYC, AML and transaction monitoring built into onboarding.

Infrastructure providers now package most of these behind one API. Bridge, which is part of Stripe, documents virtual accounts that accept deposits in USD and other currencies with their own account and routing numbers, custodial wallets that send, receive and hold stablecoins, orchestration APIs for on-ramps, off-ramps and transfers, and cards backed by stablecoin balances. Stripe’s own documentation adds stablecoin-backed cards for platforms that can be used wherever Visa or Mastercard is accepted, and payouts to third parties in more than 160 countries, including payouts in stablecoins.

Partner with a provider, don’t become a crypto company

There are three common ways to integrate, and the choice decides how much you build and how much regulatory weight you carry:

• Hosted flow: the provider’s on-ramp or wallet screens run inside your app. It is the fastest route, with the least control over the experience.
• API integration: you build every screen and call the provider for onboarding status, balances, transfers and cards. It takes longer and gives you a fully native product.
• Hybrid: you keep your existing banking partner and compliance program for dollars, and use a stablecoin provider only for the on-chain leg.

In all three, the regulated provider holds the funds and performs the activities that need licenses, which is what lets a product team ship without becoming a money transmitter itself. Whether that holds for your product depends on your exact money flows and markets, so confirm it with counsel during discovery rather than after launch.

What the GENIUS Act changes

The US now has a federal framework for payment stablecoins. The GENIUS Act was signed on July 18, 2025. As summarized by the law firm Debevoise & Plimpton, it lets only permitted payment stablecoin issuers issue them, requires reserves on at least a one-to-one basis in specified assets such as Treasury bills, treats issuers as financial institutions under the Bank Secrecy Act, and bars issuers from paying holders any form of interest or yield. It takes effect 18 months after enactment or 120 days after final regulations, whichever comes first.

For a product team, three implications follow. Choose stablecoins and providers that will operate as permitted issuers or work with them. Be careful with any feature that looks like interest on a stablecoin balance, and get legal advice before you market one. And expect the provider’s KYC and sanctions requirements to be strict, because they are now the provider’s legal obligation, not a preference.

Design your ledger before your screens

Most bugs in wallet products are ledger bugs, not interface bugs. Keep your own record of every customer, wallet, external destination and transaction, with your identifier and the provider’s identifier stored side by side. Then follow three rules:

• Every request that moves money carries an idempotency key, generated once and reused on retry, so a network timeout never pays twice.
• The provider’s webhooks update your ledger, and a scheduled job reconciles your balances against the provider’s records.
• Each transaction moves through explicit states, such as pending, completed, failed and reversed, and the app shows the user which one applies.

A wallet that shows a wrong balance for a few minutes loses more trust than one that shows “pending” honestly.

KYC, AML and monitoring

Identity checks are part of onboarding, not a separate step. Collect what the provider requires, pass it through its API, and design the screens for the cases that are not instant: documents that need review, names that need a second check, and accounts that are approved with limits. Transaction monitoring and sanctions screening run continuously on the provider’s side, and your app needs a clear way to tell a user why a transfer is on hold without exposing the rules behind it.

Design for people who don’t care about crypto

Most users just want dollars that move instantly. Show balances in USD, hide chain details by default, and make the card the hero.

That means using words like “balance”, “send” and “card”, not “wallet address” or “network”, in the main flows. Advanced users can still find chain details on a transaction screen. The faster money moves, the more important clear confirmations and receipts become, because a stablecoin transfer to the wrong destination is hard to reverse.

“The best stablecoin product feels like a great bank account that happens to be faster.”

A launch checklist for stablecoin wallets

Before real money moves, check each of these:

• Money flows mapped end to end, with counsel’s sign-off on who holds funds at each step.
• Provider sandbox tests for every transfer type, including failures, reversals and webhook delays.
• Idempotency keys on every money-moving request, and a daily reconciliation job with alerts.
• Onboarding tested for approved, rejected, pending-review and limited accounts.
• Clear user-facing states and receipts for every transaction, plus a support view that shows the provider’s identifiers.
• Limits for new accounts, and a process for freezing an account quickly when the provider asks.
• Disclosures reviewed: no language that implies deposit insurance or interest on stablecoin balances unless counsel confirms it applies.

How we built it for Freedom Pro

For Freedom Pro, a direct-selling platform, we integrated Bridge for USD and stablecoin wallets and debit card issuing. Partners’ earnings and members’ spending live in one account, behind the same single sign-on as the platform’s wireless, streaming and wellness services.

Cards are often the feature that makes a fintech app part of daily life. We built instant virtual and physical Visa debit cards with spend limits and Apple Pay and Google Wallet support for Switch, a shared banking app for clubs and teams.

If you are adding wallets or cards to a product, our fintech app development work covers the provider choice, the ledger and the app itself. For budgets, see fintech app development cost and our pricing.