dxLink

dxLink Overview

dxLink is the next-generation access layer for working with dxFeed market data services. It provides a unified, scalable, and secure interface for consuming real-time and historical data across multiple platforms.

Designed to meet the needs of modern client-facing applications, dxLink ensures efficient data delivery even over slow networks or mobile connections by using smart algorithms and back-pressure handling.

dxLink supports:

WebSocket-based streaming and request/response models
Token-based authentication
SDKs for JavaScript, Java, .NET, C++, and Swift
Integration in B2B and B2B2C environments. It serves as the backbone for dxFeed Retail services and IaaS solutions.

On top of dxLink, clients can also use dxScript — an embedded scripting engine for on-the-fly analysis and event generation. dxScript enables technical indicators, conditional triggers, and custom logic to be executed directly in the data stream, reducing downstream processing.

Benefits

dxLink is a cloud-native access solution for scalable, secure, and developer-friendly delivery of dxFeed market data. It provides a single interface for consuming real-time and historical data across platforms, with features that simplify integration and ensure stable performance even under challenging network conditions.

Key benefits include:

Unified access to real-time and historical data via a single endpoint
Cloud scalability with autoscaling and intelligent load balancing
Resilience under high load and slow or unstable network conditions
Built-in observability with real-time metrics and alerting tools
Enterprise-grade security, including TLS 1.3 and fine-grained access control

Note

For maximum throughput and ultra-low latency in B2B systems, consider using Quote Distribution model.

Supported platforms and protocols

dxLink is available on the following platforms:

JavaScript SDK
Java SDK
.NET SDK
C++ SDK
Swift SDK

Each SDK implements a shared application protocol and handles authentications, reconnects, and subscriptions.

When to use dxLink

Use dxLink if you:

Build a web or mobile application that requires dxFeed market data
Need a single endpoint for subscribing to real-time quotes, DOM, greeks, or candles
Want to avoid low-level transport protocols
Require authentication, session control, and observability

Getting started

To connect to dxLink:

Contact your sales manager to request trial or production access. Once approved, your welcome letter will contain information about your WebSocket endpoint (e.g. wss://your-endpoint.dxfeed.com). Read more on the Getting Started page.
Choose how to connect. Use one of the SDKs or connect directly via API by y complying with the protocol.
Test your setup. Try our demo endpoint and debug console.
Start working. Connect and obtain market data.

Authentication and access control

dxLink uses various authentication systems and supports multiple access modes, and session types. The platform is flexible and can integrate with different environments.

B2B integration

For B2B clients, authentication and access control typically involve the following methods:

Static access tokens
Dynamic tokens per system
Whitelisted IPs or pre-negotiated entitlements

B2B2C integration

In B2B2C scenarios, access is typically user-based:

Short-living tokens per user
Token access and permissions

Access levels

Access levels are configurable for all models and define available features, data environments, and privileges. See Token-based authorization for details.

Examples:

demo: token for testing purposes, with access to delayed data and demo endpoints
prod: production token with access to live data and production infrastructure
custom: token configured with specific entitlements and rules tailored for your setup

dxLink services

dxLink provides access to several key services.

Feed service

Feed service delivers real-time market data for all supported exchanges and asset classes. It provides continuous updates for quotes, greeks, and candles.

Key features:

Real-time market data for all supported exchanges and asset classes (see the full list).
Channel-based model (subscribe → receive updates)
Highly optimized data format

Depth of market (DOM) service

DOM service provides detailed order book data, allowing you to see market depth beyond the best bid and ask. It supports price-level views and is suitable for trading systems that require granular market visibility.