Pay your phone bill. Buy a slice of a mutual fund.
Paygro is a round-up investing app built on top of bill payments. Every time you pay your electricity, mobile, broadband, or gas, the spare change rounds up and goes into a mutual fund, digital gold, or a bond. Investing as a habit already in motion.
- Client
- Paygro
- Industry
- WealthTech · FinTech
- Engagement
- Custom platform
- Stack
- Flutter · Java · Microservices
- Status
- Shipped and handed over
Make investing a side effect of something people already do.
Round-up investing is not new globally. Acorns, Stash, and others have been doing it for years on top of card spends. Paygro’s bet was different. In India, card spends are not the high-frequency rail. Bill payments are. Most people pay their phone, electricity, water, broadband, and gas online. If we could capture round-ups at the moment of those payments, we could turn a daily habit into a slow, consistent investing motion.
Before any of this could ship, the client wanted a quick proof of concept. We built it in a couple of days, the conversation became serious, and we spent the next several months turning the POC into a production app.
Three things that made this non-trivial.
Round-up math at payment time, with two destinations
Every bill payment had to do two things at once. Pay the bill through Razorpay, and route the round-up amount into a mutual fund, gold, or bond. Splitting a single transaction into two financial destinations meant handling the case where the bill payment succeeds and the investment leg fails, or the other way around. We designed the flow so the user never gets stuck and the money never sits in a wrong place.
Digital gold with live market pricing
Augmont gives us the gold buy and sell rates and the purity grading. We integrated their API so customers could see live rates, place buy orders for any rupee amount, and watch their balance in grams and rupees on a dedicated gold dashboard. The price ticks fast. The UI needed to keep up without overwhelming a casual user.
An expense dashboard that earns its place
Bill payment apps usually have weak expense tracking. Paygro went the other way. We built a category-level expense dashboard with monthly trends, recurring detection, and a tax calculator. It pulls real data from the user’s payment history, so the numbers are trustworthy without manual entry.
Six modules. One investing motion.
Bill payments hub
Mobile, electricity, water, broadband, gas, and cable, all routed through Razorpay with the round-up engine attached to every transaction.
Round-up engine
Calculates spare change at the moment of payment and routes it to the user’s preferred instrument with proper rollback handling.
Mutual fund investing
Browse funds, see NAV charts, asset size, expense ratio, and benchmark. Place lump sum or SIP orders through BSE Star MF.
Digital gold
Augmont integration with live buy and sell rates, weight tracking in grams, and a dedicated gold dashboard.
Expense dashboard
Category-level breakdown of spend, monthly trends, and a tax calculator that uses real payment history.
Onboarding and e-KYC
Account creation, paperless verification, and a clean setup card on the home screen so users know what is pending.
- Java
- Spring Boot
- Microservices
- PostgreSQL
- Flutter
- Dart
- BLoC pattern
- AWS
- Razorpay
- Augmont API
- Value Research API
- BSE Star MF
Built, handed over, and still scaling without us.
Paygro went from a two-day proof of concept to a production round-up investing app with bill payments, mutual funds, digital gold, and expense tracking. We took it the full distance and handed the project over to the Paygro team with documentation and a clean deployment. The app has since crossed one lakh installs on the Google Play Store with a 4.8 star rating across 1,600+ reviews.
Building something with a payment rail underneath?
Tell us about it.
Bill payment app, round-up investing, digital gold, expense dashboards. If your build needs a payment gateway and a clean way to route money in two directions, we have done it before.
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