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Persistent Connections Meaning

In the context of high-frequency trading and real-time fintech, persistent connections are network communication channels that stay open for multiple requests and responses. The most common technical standard for this is WebSockets. In a traditional request-response model, the computer must ask for data and wait for the server to answer.

With a persistent connection, the server can push data to the computer the millisecond it becomes available.For a crypto exchange, persistent connections are vital for the order book and price feeds. If a trader is using a trading bot, they cannot afford the latency of opening a new connection every time they want to see the price. A persistent WebSocket connection allows the exchange to stream a live feed of every buy and sell order to the bot.

This allows the bot to react to market changes in microseconds, which is the difference between success and failure in a competitive market.Persistent connections also improve the user experience of mobile fintech apps. When you open a banking app and see your balance update instantly without needing to refresh the page, that is likely a persistent connection working in the background.

It reduces the network overhead and data usage, making the app feel faster and more responsive even on a weak mobile data connection.However, managing thousands of persistent connections is a server challenge. Each open connection uses a small amount of memory and CPU on the exchange’s server.

If a viral event occurs and millions of users open their apps at once, the sheer number of connections can overload the servers, leading to the API lag or system outages that often happen during high-volatility events. Engineers use load balancers and auto-scaling to try and keep these connections stable.

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Important Disclaimer:

Finery Markets BVI Limited (“Finery Markets”) provides software, technology infrastructure, and related Information and Communication Technology (ICT) services on a Software-as-a-Service (“SaaS”) basis. Finery Markets acts solely as a software vendor and does not operate a trading platform, does not intermediate, match, execute, clear, or settle transactions, and does not engage in any activities that would require regulatory authorisation under applicable laws.

Finery Markets’ software is non-custodial and is provided exclusively to licensed institutional entities that act as independent operators of their own environments. All counterparties are solely responsible for establishing and maintaining their own bilateral trading and settlement relationships. Finery Markets is not a party to any such arrangements and assumes no responsibility for the conduct, verification, or compliance obligations of any users of the software.

Nothing on this website shall be construed as a financial promotion, investment advice, or an offer to engage in regulated activities. Access to and use of the software is strictly limited to clients who have entered into a software licensing agreement with Finery Markets. Persons located in jurisdictions where such access is restricted should not rely on this website or any of its contents.

Additional notice to UK visitors: This website and associated communications are not intended to constitute a financial promotion under The Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (as amended) and related guidance. Access to services provided by Finery Markets is limited to regulated entities, professional clients and eligible counterparties as set out by the Financial Conduct Authority. UK users are not permitted to use this website for the services of Finery Markets if they don't fall within these categories.