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WebSocket · Real-Time Data

WebSocket API Development & Integration for Trading

Hire a WebSocket developer to connect live prices, order books, fills and account updates to your strategies, applications and dashboards — or to build a streaming service of your own.

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    Live connections

    What a Live Connection Delivers

    Three examples of updates a trading application can receive.

    A WebSocket is a connection that stays open between your software and a provider. New prices, order book changes and account events arrive as they happen, instead of being requested again and again.

    Some providers also accept commands over the same connection — Binance, for example, lets orders be placed through its WebSocket API. Others use WebSocket for updates only and take orders through REST.

    Our WebSocket developers connect these streams to your strategies and applications, build tools that react to them, and fix connections that drop, lag or fall out of step with the account.

    Stream demo
    BTC/USDT64,218.6
    EUR/USD1.08433
    ES5,412.25
    TimePriceSizeSide
    10:14:02.38064,218.60.200BUY
    10:14:02.24164,218.50.045SELL
    10:14:02.11864,218.60.120BUY
    10:14:01.98764,218.40.080SELL
    10:14:01.84264,218.60.310BUY
    PriceSize
    64,218.92.47
    64,218.80.560.94
    64,218.71.10
    Spread 0.1
    64,218.61.36
    64,218.52.901.60
    64,218.30.74
    10:14:04Order acceptedBuy 1.00 BTC/USDT · limit 64,200.0
    10:14:06Partial fill0.40 filled at 64,200.0
    10:14:08Order filled1.00 filled · average 64,199.9
    Position 0.00+0.40+1.00Average —64,200.064,199.9P&L —+7.40+18.60
    Demonstration data · explore three types of updates
    Development services

    WebSocket Development & Integration Services

    Connect a live stream, build around one, share your own, or fix one that is not behaving.

    01

    WebSocket Feed Integration

    Live quotes, trades, order book depth and account events connected to your existing strategy, application or trading platform — with subscriptions, sign-in and reconnection handled.

    For example
    • Exchange order book into a Python strategy
    • Broker fills into a C# risk tool
    • Live prices into an existing dashboard
    02

    Real-Time Trading Applications

    Tools that react to live events: scanners, dashboards, risk monitors and data recorders. For complete automated strategies, see Trading Bot Development.

    For example
    • P&L dashboard across accounts
    • Spread and liquidity monitor
    • Tick and order book recorder for research
    • Price and volume alerts
    03

    Custom WebSocket Servers & Streaming Bridges

    Updates from your own trading system streamed to a web panel, another application or many connected clients at once — for example, a Python model whose results appear live in a browser.

    For example
    • Model results into a live web panel
    • Signal service to subscriber apps
    • Platform events to an external monitor
    04

    WebSocket Troubleshooting & Optimization

    Connections that drop, fall behind the market, lose subscriptions, repeat events or drift out of step with the account — diagnosed, fixed and checked against the behaviour you expect.

    For example
    • Reconnects that lose subscriptions
    • Order book out of sync
    • Processing falling behind
    • Duplicate events in logs

    Have a WebSocket task that is not on this list?

    Send the provider or its documentation, the events your software needs and where the data should go — we will tell you what is possible and what it would take.

    Discuss Your Project
    Where data comes from and goes

    Live Data Sources & Destinations

    Every project connects a source to a destination. These are the most common on both sides.

    Where live data comes from
    Crypto exchangesBinance, Bybit, OKX, Kraken, CoinbaseTradovateOrders, fills and account events; market data where entitledInteractive BrokersWeb API live updatesCharles SchwabStreaming for accounts used in thinkorswimNinjaTraderMarket Data API streamingcTraderOpen API over WebSocket
    Other brokers & data providersFor example Alpaca, or market data services

    Not every live feed is a WebSocket. TradeStation, for example, streams over HTTP — we work with whatever the provider uses. See TradeStation development.

    Where it goes
    Python & C# applicationsStrategies, models and tools you already run
    Trading platformsThrough a component or a local bridge
    Web panels & dashboardsLive views for you, your team or subscribers
    Databases & storageTick and order book records for research
    AlertsTelegram, Discord or email when something needs attention
    Integration reliability

    Keeping Streams and Trading State Consistent

    Live connections are judged by what happens when something goes wrong. These are the situations a project is designed around.

    Situation
    How it is handled
    The connection drops
    Once the application has reconnected and signed in again, it restores the subscriptions it needs.
    State differs after an outage
    Orders and positions are checked against the account, and the order book is rebuilt by the provider’s rules. A fresh snapshot restores the current state — it does not return events missed during the outage, so where that history matters it is reloaded separately, if the provider allows.
    The application cannot keep up
    Queues are monitored, processing delay is measured, and the system is tested under the load agreed in the scope.
    The connection is open but data is stale
    Connection activity and data freshness are checked, taking trading sessions into account — a quiet market is not a dead feed.
    Events arrive repeated or late
    Identifiers, sequence and timestamps are checked before an event is applied.
    Development process

    How a WebSocket Project Starts

    A WebSocket developer agrees the source, the events, the destination and the expected load with you before any code is written.

    Project workflow
    STEP 01
    Source & Events
    Provider · streams · events needed
    STEP 02
    Destination
    Application · panel · storage
    STEP 03
    Load & Failures
    Expected volume · behaviour on outage
    STEP 04
    Fixed Quote
    Scope · price · delivery schedule
    STEP 05
    Build & Test
    Live data · agreed load · failure tests
    STEP 06
    Delivery & Support
    Source code · setup · guidance
    To Get Started

    Tell us where the data comes from, what your application should do with it, and whether there is existing code or a problem to fix. Load and outage behaviour are worked out together with you during scoping.

    Data SourceWhat It Should DoExisting Code or Issue
    At Delivery

    Receive the connection and application components, source files included in the scope, and instructions for setup and use. We walk through the specified behaviour and provide technical support under the agreed terms.

    Agreed Software & SourceSettings & Usage NotesSetup GuidancePost-Delivery Support
    Why Nordman Algorithms

    Why Work With Nordman Algorithms

    Live-data integrations from a team that builds trading tools running on live data every day.

    Real-Time Trading Is Our Daily Work

    Our trade copiers react to executions as they happen and our order-flow indicators work trade by trade, so live market data is familiar ground.

    Tested Under Agreed Load

    Each connection is checked with live data, the load agreed in the scope and the failure cases that matter to it.

    Clear Scope and Pricing

    Requirements, deliverables, fixed price and acceptance examples are agreed before development begins.

    NDA and IP Ownership

    An NDA is available on request. Source code and full IP ownership are transferred on delivery.

    Support After Delivery

    Setup help, configuration explanations and technical answers within the agreed support scope.

    reviews

    What Clients Say

    Feedback from clients across our custom trading software projects.

    ★★★★★
    Trustpilot
    4.7
    ★★★★★
    "Alexei understood exactly what I needed for my NinjaTrader strategy. Delivered on time, clean code, and took the time to walk me through the installation. Will use again."
    MR
    Mark R.
    Trustpilot review
    ★★★★★
    "Complex MT5 trade copier across 3 accounts — different brokers, different symbols. Nordman mapped everything perfectly. Support after delivery was excellent."
    SP
    Stefan P.
    Trustpilot review
    ★★★★★
    "Built a risk-controlled EA according to the specification. The logic was clear, the communication was professional, and the final version matched the requested workflow."
    JK
    James K.
    Trustpilot review
    FAQ

    WebSocket Integration Questions

    Short answers about live feeds, orders, outages and connection types.

    A WebSocket is a connection that stays open between your software and a provider. New prices, order book changes and account events arrive as they happen, instead of your software asking for them again and again.

    Yes. We add the connection to your Python or C# application, subscribe to the data it needs, and handle authentication and reconnection, keeping your own logic as it is.

    With some providers, yes — Binance, for example, accepts orders through its WebSocket API. Many brokers use WebSocket for updates only and take orders through REST, so the route is chosen per provider.

    The application reconnects, signs in again where needed and restores the subscriptions it needs. Orders and positions are then checked against the account, because events missed during the outage may not be sent again — that depends on the provider.

    Yes. A service collects the live data, calculates what you need — P&L, exposure, spreads — and streams the results to a web panel or to several connected users at once.

    Often more than one. REST handles requests such as placing orders or loading history, WebSocket keeps live updates flowing, and webhooks deliver signals from outside systems. See our pages on REST API integration and webhook automation for how they fit together.

    Where the data comes from, what your application should do with it, and any existing code or the problem you are seeing. Expected load and how the system should behave during outages are worked out together with you.

    Tell Us About Your WebSocket Project

    Whether you need a live feed connected, an application built around one, or a connection fixed — tell us where the data comes from and what should happen. We will review it and outline a practical scope.

    Free technical assessment
    Clear scope before development
    Post-delivery support