Algorithmic Trading9 min read
How trade copiers work — architecture & latency
Technical deep-dive into copier architecture, latency bottlenecks, order replication, and risk management in multi-account deployments.
Aug 14, 2026Read article
PSI SQUARE • case study • algorithmic trading
MT5 Trade Copier with Subscriber Web Dashboard
A real-time trade copier built in MQL5 that replicates master account positions to unlimited subscriber MT5 accounts with sub-500ms latency — paired with a Next.js web dashboard for subscriber management, billing, and live performance tracking. Subscriber base grew from 40 to 120 active accounts in 90 days post-launch.
MT5MQL5Next.jsSupabaseStripeTrade Copier
THE CHALLENGE
The challenge
A signal provider running a profitable MT5 strategy needed to scale their subscriber base beyond what manual trade sharing allowed. Their existing solution — a third-party copier service — had unpredictable latency, no branded subscriber portal, and took a revenue cut per subscriber. They needed a fully owned, white-label trade copying infrastructure with a subscriber-facing web dashboard.
Key Project Constraints & Requirements
Ultra Low-Latency Copying
Sub-500ms copy latency from master to all subscriber accounts across various brokers
Proportional Lot Sizing
Dynamic position sizing calculated per subscriber account balance and risk tier
Branded Subscriber Portal
Self-service portal: sign-up, billing, live equity curves, and complete trade history
Automated Stripe Billing
Seamless recurring subscription management with monthly and annual plan tiers
100% Owned Infrastructure
Elimination of third-party per-copy platform fees and recurring subscription cuts
THE SOLUTION
The solution
PSI Square built a two-layer system: an MQL5 trade copier engine handling real-time position replication, and a Next.js web application providing the subscriber-facing portal and operator admin dashboard.
Execution Core
MQL5 Copier Engine
Low-latency asynchronous execution layer
Master EA Architecture
Monitors master open positions and broadcasts trade events instantly via a high-throughput local socket server on the master VPS.
Subscriber EA Polling & Sizing
Subscribers poll the socket server, compute balance-proportional lot sizes, and replicate entries/exits with configurable slippage controls.
Missed-Trade & Disconnect Guard
Gracefully handles partial fills, requotes, and broker disconnects with automated reconnection and instant state reconciliation.
Web Platform
Next.js Web Dashboard
Full-stack subscriber portal & admin suite
Subscriber Portal
Branded onboarding, Stripe checkout for plan tiers, live account equity curves, and trade-by-trade P&L analytics.
Operator Admin Suite
Centralized subscriber management, active account status monitoring, MRR revenue metrics, and one-click account suspension.
Real-Time Supabase Pipeline
Trade events pushed directly from copier engine to web dashboard via secure webhooks with sub-1-second display latency.
THE ARCHITECTURE
Technical architecture
Specification details covering the MQL5 low-latency replication layer, socket server communication, and web dashboard stack.
Copier Engine
MQL5 (Master EA + Subscriber EA pair)
Communication
Local socket server — master broadcasts, subscribers poll
Latency
Sub-500ms master-to-subscriber copy execution
Lot Sizing
Proportional to subscriber account balance, configurable multiplier
Web Dashboard
Next.js + Supabase + Stripe
Subscriber Billing
Stripe Checkout — monthly/annual plan support
Real-Time Data
Supabase webhooks → dashboard under 1-second lag
Hosting
Vercel (web app) + Windows VPS (MQL5 engines)
Missed Trade Guard
Automatic reconciliation on reconnect
VERIFIED OUTCOME
Verified outcome
Commercial scaling and performance metrics measured over 90 days following platform launch.
40 → 120
Active subscribers in 90 days
300% subscriber growth post-launch
<500ms
Copy execution latency
Master to subscriber position replication
100%
Owned infrastructure
Zero third-party per-copy fees
Commercial Growth & Infrastructure Ownership
Within 90 days of the platform going live, the signal provider's active subscriber count tripled from 40 to 120. The white-label portal gave subscribers a professional, branded experience that directly reduced churn. The operator eliminated third-party copy fees entirely, increasing net revenue per subscriber while maintaining full control over the platform's roadmap and pricing.
RELATED SERVICES
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