LongPort Open Financial Interface Suite

This LongPort Application Programming Interface suite furnishes developers with direct, scripted access to quote and trade functionalities, specifically designed for entities possessing internal research and algorithmic development capabilities. It supports the construction of bespoke automated trading systems or analytical tools predicated on individual investment methodologies. Core functionalities are partitioned as follows:

Transaction Control - Issuing, modifying, and revoking orders; querying historical transaction records and current order status.
Market Data Access - Obtaining instantaneous security valuations and retrieving time-series historical pricing information.
Asset Oversight - Real-time introspection of account balances, security holdings, and liquidity status.
Event Streaming - Enabling persistent WebSocket connections for immediate price updates and asynchronous notifications regarding order lifecycle events.

The repository encompasses SDK implementations for several primary programming environments:

Name	Documentation Link	Supported Platform/Version Notes
Rust	Doc	Rust development kit `(>= 1.89.0)`
Python	Doc	Python interpreter suite `(>= 3.7)`
Node.js	Doc	Node.js runtime environment `(>= 10)`
Java	Doc	Java Virtual Machine platform `(>= 1.8)`
C	Doc	C language standard `(>= C99)`
C++	Doc	C++ standard library `(>= C++17)`
Go		Go language repository: https://github.com/longportapp/openapi-go
MCP		Implementation of an Message Control Protocol server interfacing with LongPort API

Configuration Environment Variables

Variable Name	Purpose and Default Value
LONGPORT_LANGUAGE	Locale setting: `zh-CN`, `zh-HK`, or `en` (Default: `en`)
LONGPORT_APP_KEY	Essential application authentication credential (Key)
LONGPORT_APP_SECRET	Essential application authentication credential (Secret)
LONGPORT_ACCESS_TOKEN	Current user authorization token
LONGPORT_HTTP_URL	Base URL for synchronous RESTful interactions (Default: `https://openapi.longportapp.com`)
LONGPORT_QUOTE_WS_URL	WebSocket endpoint URI for receiving market data streams (Default: `wss://openapi-quote.longportapp.com/v2`)
LONGPORT_TRADE_WS_URL	WebSocket endpoint URI for receiving transaction status updates (Default: `wss://openapi-trade.longportapp.com/v2`)
LONGPORT_ENABLE_OVERNIGHT	Boolean flag to include after-hours pricing data (`true` or `false`; Default: `false`)
LONGPORT_PUSH_CANDLESTICK_MODE	Defines candle data resolution: `realtime` or `confirmed` (Default: `realtime`)
LONGPORT_PRINT_QUOTE_PACKAGES	Verbosity setting: output received quote packets to console (`true` or `false`; Default: `true`)
LONGPORT_LOG_PATH	Specifies the filesystem location for persistent diagnostic logs (Default: `no logs`)

Comprehensive SDK Documentation

Access the full technical specification here: https://longportapp.github.io/openapi

Supporting Materials

Licensing Terms

This codebase is offered under dual licensing options:

Apache License, Version 2.0, accessible via (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
MIT License, accessible via (LICENSE-MIT or http://opensource.org/licenses/MIT)

You may choose either license agreement.

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