A fintech isn't won with a pretty screen: it's won by making sure the user's money is never at risk and the regulator never pulls down your shutters. Building a fintech app or digital wallet means building an application that moves real money, which demands bank-grade security, regulatory compliance in the country where you operate, and integrations with payment gateways, KYC, and — almost always — a licensed financial entity behind the scenes. The code is the easy part; compliance and a secure architecture are what decide whether your fintech lives or dies.
What makes a fintech app different from any other app
Every app handles data. A fintech handles money and sensitive, regulated data, and that changes everything:
- Errors aren't forgiven: a bug in a delivery app is annoying; a bug in a wallet can double a payment or expose balances. The quality bar is far higher.
- The regulator is a stakeholder: BCRA in Argentina, CNBV under the Fintech Law in Mexico, SFC in Colombia. Your architecture has to be able to demonstrate traceability and controls.
- Trust is the product: nobody leaves their money in an app that feels fragile. 2FA, movement alerts and transparency aren't extras — they're the core.
For all of this, a fintech isn't a project where improvising makes sense. It's custom software in its most demanding form.
The four pillars of a digital wallet
1. Compliance and legal structure
Before the first sprint you have to know under what structure you'll operate. The most common options in LATAM:
- PSP / payment aggregator: you move third-party funds without being a bank. The fastest path for a wallet.
- Banking as a Service (BaaS): you build on top of a regulated provider's license and accounts. You launch sooner and with less risk.
- Your own entity (IFPE, EDE, etc.): full control, but months of paperwork and regulatory capital. Only when volume justifies it.
KYC (identity verification) and AML (anti-money-laundering) are mandatory. They're integrated through specialized providers, not built from scratch.
2. Security
The layer that most separates a serious fintech from an experiment:
- TLS encryption in transit and AES at rest.
- Card-data tokenization and PCI DSS compliance if you touch it.
- Two-factor authentication and biometrics.
- Fraud detection and dynamic transaction limits.
- Security audit and pentesting before going live.
3. Payment integrations
A wallet lives by moving. The usual pieces:
- Local gateways: Mercado Pago, dLocal, Ualá Bis, PayU depending on the market.
- Transfer networks: Pix in Brazil, transfers 3.0 / CVU in Argentina, SPEI in Mexico.
- Card processing and, if you issue your own card, an issuing provider.
4. Architecture
Microservices to isolate payments, identity and balances; a double-entry ledger as the source of truth for the money; message queues to process transactions asynchronously and traceably; and idempotency on every operation so a retry never charges twice. For the app itself, a solid hybrid or native base makes sense depending on the case, as we explain in React Native vs Flutter 2026.
Have a fintech idea and don't know where to start with compliance? Book a 30-minute call and we'll help you map out the legal structure, integrations and architecture at no cost.
How much it costs and how long it takes in 2026
Ranges for development in LATAM with a regional team. Compliance, audits and regulated integrations are what inflate the budget compared to an ordinary app.
| Stage | What it includes | Cost (USD) | Timeline |
|---|---|---|---|
| MVP on BaaS | Account, top-ups, payments, KYC, 2FA | 40,000 – 70,000 | 5 – 8 months |
| Full platform | MVP + anti-fraud + card + admin panel | 80,000 – 200,000 | 9 – 14 months |
| Own infrastructure | Own ledger + issuing + direct bank integration | 200,000+ | 12 – 18 months |
On top of this come recurring costs that many founders underestimate: KYC per verification (USD 0.50 to USD 3 per user), gateway fees (1.5% to 4% per transaction), cloud infrastructure and maintenance (15% to 20% of development per year). We cover them in hidden costs of building an app.
The smart move for a founder is to start on BaaS with a tightly scoped MVP: you validate demand and your business model in under a year without burning capital on your own license. It's the approach behind our fintech application service and our MVP for startups service.
When building a custom fintech is NOT for you
Let's be straight, because there's a lot of money on the line here:
- If you don't have regulatory clarity yet, don't hire development. First define the legal structure with a fintech lawyer; that rewrites half of the technical decisions.
- If all you need is to collect payments inside another app, you don't need a wallet: you integrate a gateway and you're done. A fintech is justified when moving money IS the product.
- If you don't have capital for the long 12 months of a regulated project plus its working capital, validate demand with a prototype or landing page before committing to full development.
A poorly capitalized digital wallet that runs out of runway halfway through is the most expensive mistake in the field.
How to start well
- Define the legal structure and the launch country — everything technical depends on it.
- Choose BaaS or PSP for your first version and reduce regulatory risk.
- Scope the MVP down to a single, clear value proposition: a wallet that does one thing very well retains better than one that does ten things halfway.
At Deepyze we build fintech applications and digital wallets for founders in Argentina and across LATAM, focused on security, compliance and a real production launch — not a pretty demo. We work with fixed pricing, a team in your own time zone and a concrete proposal in 24 hours. Tell us about your project and we'll send back a plan with a suggested legal structure, architecture, costs and timelines. Take a look at our projects too to see how we work.
Frequently asked questions
How much does it cost to build a fintech app?+
A virtual wallet MVP with accounts, top-ups and payments starts at USD 40,000 to USD 70,000 in LATAM. A full fintech with KYC, anti-fraud and bank integration runs from USD 80,000 to USD 200,000. Compliance and security weigh on the budget far more than the screens do.
Do I need a license to run a digital wallet?+
It depends on the country and the model. In Argentina, wallets typically operate as a PSP registered with the central bank (BCRA) without being a bank; in Mexico they require an IFPE license under the Fintech Law. Before you write a single line of code you need regulatory clarity, because it defines your architecture and your integrations.
How long does it take to build a fintech from scratch?+
A regulatorily viable MVP takes 5 to 8 months, because on top of development you add KYC integrations, payment gateways and a security audit. A full platform with its own financial product can take 9 to 14 months to reach production.
What level of security does a fintech app need?+
The highest that's reasonable: encryption in transit and at rest, two-factor authentication, card-data tokenization, fraud detection and PCI DSS compliance if you touch card data. Security is not an optional feature; it's the foundation of the product and of user trust.
Is it better to build everything custom or use Banking as a Service?+
To start, it's smart to lean on a Banking as a Service provider or a PSP that already holds the license and the bank account. You build your app and your experience on top of their regulated infrastructure, launch months earlier and reduce risk. You only bring things in-house once volume justifies it.
Want this working in your company?
At Deepyze we turn manual processes into systems that work on their own: AI automation, web and mobile apps, and custom software. Tell us your case and you will have a concrete proposal within 24 hours.
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