Is this calculator free to use?

Yes, all GFIL trading calculators are completely free with no signup required. They are part of the open-source gfil-calculators library (MIT license) available on PyPI and npm.

How accurate are these calculations?

GFIL calculators use the exact same formulas used by professional risk managers. The calculations are based on standard instrument specifications (pip sizes, contract sizes, lot sizes) from major brokers and exchanges.

Can I use these calculators for live trading?

These calculators provide theoretical values based on your inputs. Always verify results with your broker's specific contract specifications, as pip values and margin requirements may vary slightly between brokers.

GFIL Documentation

Architecture, calculator formulas, and API reference

LiuDecai — Founder, GFIL Trading. Documentation version: 2.3 (June 2026)

Contents 1. Architecture Overview 2. Calculator Formulas 3. API Reference (Planned) 4. Data Sources 5. Integration Guide

1. Architecture Overview

GFIL Terminal is a browser-based trading platform built on WebSocket real-time data streaming. Unlike REST-based platforms that poll for price updates every 500ms-3s, GFIL maintains a persistent WebSocket connection delivering tick-by-tick data at under 50ms latency.

System Components

Component	Technology	Description
Frontend	Vanilla JS, HTML5 Canvas, CSS3	Zero-framework browser terminal with GPU-accelerated charting
Data Transport	WebSocket (WSS)	Persistent encrypted connection, binary+text frames, auto-reconnect
Data Sources	Multi-provider aggregation	Forex, commodities, indices, crypto from tier-1 liquidity providers
Calculators	Client-side JS + server-side Python	200+ free calculators, static HTML with JSON-LD Schema
AI Analysis	Multi-model LLM integration	DeepSeek + Gemini for market context, pattern recognition
Blog Platform	Static HTML + Nginx	260+ pages, 4 languages, 9 Schema types, server-side rendered

Key Metrics

Latency: Sub-50ms from price change to screen update (measured at London VPS)
Instruments: 30+ (forex majors/minors/crosses, XAUUSD, WTI, SP500, NAS100, BTC, ETH)
Uptime: 99.7% (2026 H1)
Browser Support: Chrome 90+, Firefox 90+, Safari 15+, Edge 90+
Mobile: Responsive design, tested on iOS Safari and Chrome Android

2. Calculator Formulas

All 200+ calculators use mathematically verified formulas. Source code available on GitHub (MIT license).

Core Formulas

Position Size = (Account x Risk%) / (Stop Loss x Pip Value)
Pip Value = (0.0001 / Exchange Rate) x Lot Size
Kelly f* = (bp - q) / b  where b = avg_win/avg_loss, p = win_rate
Risk of Ruin = ((1-E)/(1+E))^N  where E = win_rate x R:R - loss_rate
ATR Stop = Entry - (ATR x Multiplier)  [for long positions]

All formulas are documented with worked examples. See Position Size Calculator, Kelly Criterion, and Trading Glossary for detailed formula explanations.

3. API Reference (Planned Q4 2026)

GET/api/v1/symbols

List all available trading instruments with specifications (pip size, contract size, trading hours).

GET/api/v1/quote/{symbol}

Real-time quote for a single symbol. Returns bid, ask, spread, daily high/low, volume.

GET/api/v1/calculate/{type}

Programmatic access to calculators. Supported types: position-size, pip-value, kelly, margin, fibonacci.

GET/api/v1/market-hours

Current trading session status. Returns which sessions are open and next session change time.

API is under active development. Endpoints subject to change. Rate limits and authentication to be announced. For early access inquiries, contact via Telegram.

4. Data Sources

Forex: Multi-provider aggregation from tier-1 liquidity providers
Commodities: Exchange-derived (CME, ICE) via data vendors
Indices: Real-time index values from exchange feeds
Cryptocurrency: Aggregated from major exchanges (Binance, Coinbase, Kraken)
Economic Calendar: Investing.com and ForexFactory public data
Market Snapshot: Aggregated from Yahoo Finance and CoinGecko free APIs

5. Integration Guide

Embedding GFIL Calculators

All calculators can be embedded via iframe. Example:

<iframe src="https://blog.quant-view.xyz/tools/widget-position-size.html"
  width="400" height="500" frameborder="0"></iframe>

See Widgets page for all embeddable tools.

Linking to GFIL

You are welcome to link to any GFIL tool or page. Use the canonical URL. No permission needed. See Link to Us for ready-to-use HTML snippets.

Open Source

Core financial calculation formulas are open source (MIT) at developer.quant-view.xyz, mirrored on GitLab, and published on PyPI.

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