What is SimplWallet
SimplWallet is a revolutionary crypto wallet that enables users to send and receive cryptocurrency using just a phone number. No complex wallet addresses, no confusion—just simple, fast, and secure crypto transfers.
Built with cutting-edge technology, SimplWallet achieves sub-50ms transaction speeds while maintaining bank-grade security through 256-bit encryption and multi-factor authentication.
Applications that require high speed and simplicity, that are difficult to implement with traditional crypto wallets are possible on SimplWallet, such as:
- Phone number transfers - Send crypto using just a phone number
- Instant transactions - Sub-50ms processing times
- Smart escrow - Automatic fund protection for unregistered recipients
- Multi-wallet support - Link MetaMask, Bitcoin wallets, and more
Architecture
SimplWallet implements a phone-to-wallet mapping layer that securely links phone numbers to cryptocurrency wallet addresses. This architecture enables seamless transfers while maintaining security and privacy.
Core Components
The SimplWallet architecture consists of several key components:
- Mapping Service: Securely stores encrypted phone → wallet mappings
- Verification Layer: OTP-based phone number verification
- Transaction Engine: Handles transaction routing and processing
- Escrow Contracts: Smart contracts for fund protection
- Monitoring System: Real-time transaction confirmation tracking
Data Flow
When a user sends crypto via phone number:
- Sender enters recipient phone number and amount
- System resolves phone number to wallet address
- User signs transaction with their connected wallet
- Transaction is broadcast to the blockchain
- Recipient receives instant notification
- Funds appear in recipient's wallet after confirmation
Phone Number Transfers
SimplWallet's phone number transfer system is the core innovation that makes crypto accessible to everyone. Here's how it works:
Verification & Linking
User verifies phone via OTP and links one or more wallets (e.g., MetaMask via WalletConnect, Bitcoin via xpub, or an in-app custodial wallet).
Mapping Layer
The backend stores phone → wallet mappings. Mappings are stored encrypted; only a hashed/obfuscated token is used in public references. Optionally anchor verification proofs or revocation metadata on a light on-chain registry (minimal on-chain footprint).
Send Flow
Sender inputs phone number and amount. System resolves recipient mapping and network, prompts user to sign the transaction using their chosen wallet. Transaction is broadcast to the chain.
Escrow (Fallback)
If recipient is unregistered or opts out, funds are held in an escrow smart contract. Recipient verifies phone and claims funds. Escrow contains timeout and dispute resistant logic.
Notification & Finality
Recipient receives notification and a transaction record. Block confirmations are surfaced, and a link to a block explorer is offered.
Security Model
Security is at the core of SimplWallet's design. We implement multiple layers of protection:
Encryption
- AES-256 Encryption: All sensitive data encrypted at rest
- SSL/TLS: Secure data transmission
- Hashed Mappings: Phone numbers never stored in plain text
Authentication
- OTP Verification: Phone number ownership verification
- Biometric Auth: Face ID, Touch ID support
- Multi-Factor: Optional 2FA via authenticator apps
Smart Contract Security
- Audited Contracts: Third-party security audits
- Timeout Logic: Automatic fund return after inactivity
- Dispute Resolution: Built-in arbitration mechanisms
Getting Started
Get started with SimplWallet in just a few simple steps:
1. Download the App
SimplWallet is available on both iOS and Android. Download from the App Store or Google Play.
2. Verify Your Phone
Enter your phone number and verify it with the OTP code sent to you. This links your phone number to your SimplWallet account.
3. Connect Your Wallet
Link your existing wallet (MetaMask, Bitcoin, etc.) or create a new custodial wallet in-app.
4. Start Sending
You're all set! Send crypto to anyone using just their phone number.
Sending Crypto
With Simpl, sending crypto is as effortless as sending a text. Just enter a phone number, choose the amount, and tap send—no wallet addresses, no network confusion, no delays. Simpl handles all blockchain interactions behind the scenes, delivering a fast, secure, user-friendly transfer experience built for everyone.
Receiving Crypto
Receiving crypto on Simpl is instant and hassle-free. Anyone can send funds to your phone number—no wallet setup or addresses required. You'll get a notification as soon as the transfer arrives, and the crypto is immediately accessible in your Simpl wallet. It's the easiest way to receive digital assets, even for first-time users.
Wallet Setup
Setting up your Simpl wallet takes only seconds. Just sign up with your phone number, verify your identity, and your wallet is automatically created—no seed phrases, no complex steps. Simpl handles the secure backend so you can start sending and receiving crypto immediately, even if you're brand-new to digital wallets.
Prediction Market Integration
Simpl is expanding into onnchain prediction markets, making them accessible to everyday users using the same phonennumber identity layer. While prediction markets have high potential, most users avoid them due to complex interfaces and wallet management. Simpl eliminates this friction by enabling onentap participation where all routing, settlement, and contract interactions happen behind the scenes.
Why Prediction Markets?
Prediction markets offer one of the clearest real world applications of crypto: markets for sports, events, prices, politics (where legal), and more. By integrating them directly into Simpl, users gain a reason to engage daily, improving retention and driving utility beyond transfers.
Seamless User Experience
• One tap participation. • No wallet switching or network selection. • Earnings automatically credited to the user's Simpl wallet. • Smart contract secured settlements.
API Reference
The Simpl API enables developers to integrate phone-number–based crypto transfers directly into their applications. With a clean, modern REST architecture, the API handles wallet creation, identity verification, asset transfers, and balance retrieval, all while abstracting away blockchain complexity. Each endpoint is designed to be secure, predictable, and easy to implement, allowing partners to build seamless crypto experiences without managing private keys or network-level interactions.
Escrow System
The escrow system provides a safe fallback for transfers sent to phone numbers that are not yet linked to a recipient wallet. It ensures senders do not lose funds when the recipient is unregistered or slow to claim, while keeping the user experience seamless.
Integration Guide
Simpl enables crypto transfers using phone numbers, abstracting away wallet addresses.
Third-party apps, wallets, exchanges, and dApps can integrate Simpl to allow:
- Send crypto to any phone number
- Receive crypto through Simpl-managed mapping + escrow
- Resolve phone → wallet mappings
- Use escrow if the recipient is not registered
- Embed Simpl account setup and claim flows
Simpl is chain-agnostic and works across multiple EVM networks.