Zincir
Enterprise Custodial USDC Wallet with Forex Trading
Project Overview
Full-stack custodial cryptocurrency wallet on Base network with HD address generation, ledger-first accounting, dual-control withdrawals, and integrated Avantis Forex perpetual trading.
The Challenge
Build a production-grade custodial wallet that maintains institutional-level security while providing seamless UX for cryptocurrency deposits, withdrawals, and leveraged Forex trading — all without requiring users to manage their own keys.
Our Solution
Developed a comprehensive custodial platform with HD wallet architecture for unique deposit addresses, double-entry ledger accounting, dual-control withdrawal approvals, and integrated Avantis SDK for 500x leveraged Forex trading on 18 pairs. Implemented isolated signer service with HMAC protection for secure key management.
Key Results
- Ledger-first accounting with complete audit trail
- HD wallet generation for unique user addresses
- Dual-control withdrawals requiring 2 admin approvals
- 18 Forex pairs with up to 500x leverage
- Real-time P&L tracking with WebSocket feeds
Key Features
Comprehensive functionality delivering real business value
Custodial Wallet
Full custodial wallet service on Base L2 with USDC support. Users deposit, trade, and withdraw without managing private keys
HD Addresses
BIP-39/BIP-32 HD wallet derivation generates unique deposit addresses for each user while maintaining centralized control
Ledger System
Double-entry bookkeeping with immutable ledger entries. Every transaction creates paired debit/credit records for complete auditability
Forex Trading
Integrated Avantis perpetual trading with 18 Forex pairs. Real-time price feeds, market hours enforcement, and up to 500x leverage
Dual-Control Approvals
Withdrawal security requiring 2 separate admin approvals before execution. Prevents single-point-of-failure fraud scenarios
Auto Sweep
Automated background worker sweeps confirmed deposits from user addresses to master hot wallet. Manages gas refills automatically
Real-time P&L
Live profit/loss tracking for all open positions. WebSocket price feeds update every second for accurate portfolio valuation
Admin Dashboard
Comprehensive admin console for withdrawal approvals, user management, and system monitoring with complete audit logs
Technology Stack
Modern tools and frameworks powering this solution
Frontend
5 technologies
Backend
5 technologies
Blockchain
5 technologies
Forex Trading
5 technologies
Security
5 technologies
Infrastructure
5 technologies
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