FiatNest

FiatNest is a stablecoin-first wallet that looks and feels like a modern banking app. It shows balances in your local currency, hides crypto complexity and lets you earn yield seamlessly. Users can deposit both crypto and fiat (via bank transfer), which is automatically converted into stablecoins. Perfect for everyday users who don't even know what web3 is.

Key features:

• Simple, Familiar UX: Intuitive interface that feels like a modern banking app, no crypto jargon or complexity but still self-custodial.
• Stablecoin-First, Fiat-Native: Balances shown in your local currency (EUR, USD, etc.) using stablecoins like EURe or USDC on the backend.
• DeFi Under the Hood: Automatically swap crypto deposits into stablecoins, and earn yield directly in the app, no extra steps, fully gas abstracted.
• Effortless Onboarding: Sign up in seconds. Fund via crypto or direct bank transfer (IBAN).

User Flow and core functionalities

• Download the app on your phone and sign up, private key is safely stored in your keychain.
• Fund your wallet in two easy ways: Deposit any cryptocurrency to your Ethereum address, tokens are automatically swapped into your preferred stablecoin. Or make a bank transfer to your wallet's unique IBAN (powered by Monerium) and receive Euro stablecoin directly into your wallet.
• Accounts: See your available balance in your local currency, the most familiar and intuitive starting point.
• Cards: Add your crypto debit/credit cards (e.g., Gnosis Pay or other stablecoin-based cards) and view all your spending in one place. Includes transaction explorer links by Blockscout.
• Swap: Convert between different stablecoins as needed.
• Invest: Make your money work for you! Allocate stablecoins to yield-generating strategies (powered by Flow) all within a single tap in the app.

The wallet was built as an Xcode iOS app, programmed using Swift, with web3.swift enabling wallet creation, secure private key storage in the iOS keychain and local signing of transactions. Onchain transaction and pricing data was pulled in using Blockscout, ensuring accurate, real-time transaction updates. A key highlight was the integration of the Flow DeFi ecosystem, enabling one-tap investments into stablecoin yield opportunities.