Webull

Webull is a D library for the Webull OpenAPI, providing authenticated access to market data including real-time quotes, OHLCV bars, tick data, and order book depth for equities, options, crypto, and futures.

Features

Authentication

• HMAC-SHA1 Signing - Automatic request signing with app key/secret
• Token Lifecycle - Create, poll, and cache authentication tokens with MFA support
• Permission Detection - Runtime probing of available API permissions

Market Data

• Bars - OHLCV candlestick data with configurable timespans (M1 through yearly)
• Snapshots - Real-time price, volume, and change data with extended/overnight hours
• Order Book - Level-2 quotes with configurable depth
• Ticks - Individual trade records with volume and direction
• Footprint - Delta volume analysis with buy/sell level breakdowns

Security Types

• US Stocks - US_STOCK
• US Options - US_OPTION
• Hong Kong Stocks - HK_STOCK
• China Stocks - CN_STOCK
• Cryptocurrency - CRYPTO
• Futures - FUTURES

Quick Start

Requirements:

• D compiler (DMD/LDC)
• Webull OpenAPI credentials (key + secret)

Setup:

import webull.client;
import webull.security;
import webull.market;

// Configure credentials
Client.key = "your_app_key";
Client.secret = "your_app_secret";

// Create and authenticate token
Client.createToken((status) {
    writeln("Waiting for MFA approval...");
});

// Access market data
auto aapl = new Security("AAPL", Category.US_STOCK);
auto snap = aapl.snapshot();
writeln("AAPL: $", snap.price, " (", snap.changeRatio, "%)");

API Overview

Client

• createToken() - Initiate authentication with optional polling callback
• checkToken() - Validate current token status
• detectPermissions() - Probe available API endpoints

Security

• autoUpdate - Automatic refresh of cached market data
• bars() - Retrieve OHLCV history
• snapshot() - Current quote data
• orderBook() - Bid/ask levels
• ticks() - Recent trades

Market Functions

• getBars() - Single or batch bar retrieval
• getSnapshot() - Single or batch snapshots
• getOrderBook() - Level-2 market depth
• getTicks() - Trade tick history
• getFootprint() - Volume delta analysis

Architecture

• webull.client - Authentication state and token management
• webull.security - Security objects with auto-updating data accessors
• webull.market - Market data endpoints (bars, quotes, ticks, snapshots, footprint)
• webull.composer - HMAC-SHA1 request signing and HTTP orchestration

Roadmap

• HMAC-SHA1 authentication
• Token lifecycle management
• Bars API (single + batch)
• Snapshots API (single + batch)
• Order book API
• Tick data API
• Footprint API
• WebSocket streaming
• Order placement API
• Account/position queries

License

Webull is licensed under the AGPL-3.0 license.