JavaScriptNode.jsTypeScript
Crypto Exchange SDKs

A crypto exchange SDK is a developer toolkit that wraps raw exchange APIs into typed, well-documented functions. Instead of stitching REST and WebSocket requests together yourself, you get ready-made clients for authentication, trading, market data, and utilities that follow best practices out of the box. These SDKs even allow you to send orders via WebSockets and await them like a REST API.

Choose a package from the SDK directory, install it via npm (for example, 'npm install @siebly/kraken-api') or your favourite package manager (pnpm, yarn, etc), and import it into your project. Follow the examples for more detailed guidance. Each SDK comes with full TypeScript support and comprehensive documentation. TypeScript is strictly optional, but you'll benefit from rich types even in pure JavaScript projects.

The core surface covers authenticated trading (spot, margin, derivatives), public market data, WebSocket streaming, account management, withdrawals, and exchange-specific extras like copy trading or sub-accounts. Where the exchange exposes other endpoints, as well as sending orders via a persisted WebSocket connection (WebSocket API), we surface those too.

Yes, all our SDKs are completely free and open-source. You can use them in both personal and commercial projects without any licensing fees. We hope they help you as they've helped us scale our systems. If they have, do consider sponsoring us on GitHub to support our open-source efforts.

Our SDKs provide comprehensive coverage of all known exchange APIs including REST endpoints, WebSocket streams (for consuming WebSocket events), and WebSocket API calls (for sending commands over a persisted WebSocket connection). We continuously update our SDKs to support the latest features & capabilities.

The SDK handles signature generation, request building, connectivity heartbeats, WebSocket persistence, reconnect handling, and type safety for you. That means fewer bugs, faster onboarding for new engineers, and consistent behaviour across exchanges without re-implementing the same boilerplate. Nearly a decade of active usage across thousands of projects gives you a proven foundation for all your connectivity to exchange APIs.

Yes. We take pride in the SDKs being built by hand, and they are designed to be developer-friendly and work well with coding agents.

The well-typed functions, comprehensive documentation, and consistent interfaces make it easy for coding agents to understand and use the SDK effectively.

We also have an AI guide with detailed guides, skills, patterns, and a prompt generator to help you build with exchange APIs using your coding agent. The website content is also available in markdown for coding agents.

Public market data works without credentials. To trade or manage accounts you will need API keys from the exchange. The SDK accepts keys via environment variables or secure secrets managers.

We regularly monitor exchange API changes and update our SDKs accordingly. Most updates are released within days of exchange API modifications and published in the release notes. See something that you can't find in our SDK? Get in touch or open a pull request!

We enforce static analysis, dependency scanning, and manual code review for every release. Our NPM account uses a secure, isolated, 0-trust mailbox with strict rules. The release workflow is gated behind both automated and manual approval steps. We use a tokenless publishing process with OIDC, ensuring no NPM tokens are in existence. Provenance metadata with each release helps verify supply-chain integrity; see the security page for more detail.

You can get help through our GitHub repositories, the support page, or our community support channels.

Our SDKs are battle-tested and have nearly a decade of heavy usage in realtime systematic trading systems across thousands of users. That being said, integrations can vary and we recommend thorough testing in staging environments before deploying to production.

Yes. Start with the tutorial that matches the exchange you want to connect to: Binance JavaScript API tutorial, Bybit JavaScript API tutorial, or Kraken JavaScript API tutorial. They walk through real REST API and WebSocket mechanics rather than only showing a package install.

If you just want the shortest path to a working client, use the quickstart guides: Binance JavaScript quickstart, Bybit JavaScript quickstart, OKX JavaScript quickstart, Gate JavaScript quickstart, Bitget JavaScript quickstart, KuCoin JavaScript quickstart, Coinbase JavaScript quickstart, Kraken JavaScript quickstart, and BitMart JavaScript quickstart.

Building with Codex, Claude Code, Cursor, or another coding agent? Use the AI guide after choosing an SDK. The AI pattern library is the broad index; Historical Backfill with Live WebSocket Streams guide, Exchange State Management guide, and Order Intent Chasing guide cover common projects that need more than a single API call.

Siebly currently covers JavaScript SDKs for Binance JavaScript quickstart, Bybit JavaScript quickstart, OKX JavaScript quickstart, Gate JavaScript quickstart, Bitget JavaScript quickstart, KuCoin JavaScript quickstart, Coinbase JavaScript quickstart, Kraken JavaScript quickstart, and BitMart JavaScript quickstart. Each guide focuses on the package for that exchange, with install steps, REST and WebSocket usage, examples, and links back to the source package.

Yes. Take a look at the Binance JavaScript API tutorial for a detailed walkthrough of the core Binance flows using Siebly's Binance JavaScript SDK. The Binance JavaScript quickstart is the quicker way to get started with Spot, Futures, Margin, Binance REST API, and Binance WebSocket API request/response workflows when you want less detail and ready-to-use code snippets. Install binance on npm or inspect the source on GitHub.

You can also check out detailed examples across a number of scenarios, such as the Binance USD-M Futures REST order example and the Binance public WebSocket trades example.

Yes. Take a look at the Bybit JavaScript API tutorial for a guided walkthrough of Bybit V5 REST, public streams, private streams, demo/testnet routing, and WebSocket API commands using Siebly's Bybit JavaScript SDK. The Bybit JavaScript quickstart is shorter guide to get you started as soon as possible: install the client, wire up credentials, and get straight into ready-to-use code snippets. Install bybit-api from npm, or review the source on GitHub.

You can also jump into detailed examples, including the Bybit private REST example and the Bybit public WebSocket example.

Yes. For OKX, the OKX JavaScript quickstart is the place to start. It covers Spot, Futures, Options, Grid, REST methods, public and private streams, and WebSocket API trading flows with install steps and working snippets for Siebly's OKX JavaScript SDK. Install okx-api on npm, or review the implementation on GitHub.

For a more practical read, pair the guide with the OKX private trade REST example and the OKX private WebSocket example.

Yes. Use the Gate JavaScript quickstart when you want to connect to Gate Spot, Futures, REST workflows, WebSocket streams, or WebSocket API commands with Siebly's Gate JavaScript SDK. The guide keeps the setup practical: install the client, choose the right client class, and move into code. The npm package is gateio-api, and the source is on GitHub.

A useful pair to read alongside it is the Gate futures REST trade example and the Gate public WebSocket example.

Yes. The Bitget JavaScript quickstart walks through the practical setup for Bitget Spot, Futures, Copy Trading, REST clients, WebSocket streams, and UTA flows where the API supports them. Use it when you want Siebly's Bitget JavaScript SDK installed and calling Bitget APIs without a long detour. Install bitget-api on npm, or review the SDK on GitHub.

For working code, compare the Bitget spot REST trade example with the Bitget private WebSocket example.

Yes. The KuCoin JavaScript quickstart covers KuCoin Spot, Margin, Futures, Lending, signed REST calls, and WebSocket session setup using Siebly's KuCoin JavaScript SDK. It is written for the point where you want to install the package, add credentials, and run useful calls quickly. Install kucoin-api from npm; use GitHub for source and repository examples.

For code you can run, start with the KuCoin futures order guide example and the KuCoin spot WebSocket example.

Yes. Start with the Coinbase JavaScript quickstart for Coinbase Advanced Trade, Coinbase App, Exchange, International Exchange, Prime, Commerce, REST clients, and WebSockets where those APIs expose them. It gives you the practical path into Siebly's Coinbase JavaScript SDK, from package install through the first client calls. The SDK is published as coinbase-api on npm, with source on GitHub.

For a first read through the examples, use the Coinbase Advanced Trade spot order example and Coinbase Advanced Trade WebSocket example.

Yes. Start with the Kraken JavaScript API tutorial if you want the guided version for Kraken Spot, Futures, REST clients, WebSocket streams, and Spot WebSocket API request/response flows using Siebly's Kraken JavaScript SDK. The Kraken JavaScript quickstart is the faster route when you mainly want install steps, imports, and ready-to-use snippets. Install @siebly/kraken-api from npm, or read the source on GitHub.

You can also start from the Kraken derivatives order-management example and the Kraken spot WebSocket example to see REST and WebSocket usage side by side.

Yes. The BitMart JavaScript quickstart covers BitMart Spot, Margin, Futures, REST clients, plus market and private WebSocket streams with Siebly's BitMart JavaScript SDK. It is the right starting point when you want the package installed and real BitMart API calls running quickly. Install bitmart-api from npm, or review the source on GitHub.

The BitMart spot order REST example and BitMart spot WebSocket example show the two main integration styles side by side.

We frequently evaluate the leading exchanges in the market - if you would like us to consider your exchange in our next release, please get in touch!