What Are APIs and How Are They Used in Cryptocurrency Trading? | HackerNoon
Briefly

APIs decentralize the modern economy by enabling online commerce for retailers. They are utilized in various industries, including cryptocurrency trading for real-time market data and client account management.
In cryptocurrency trading, APIs act as interfaces to interact with exchanges, providing market data updates, trade execution, and account management. They streamline processes once handled by brokers, offering real-time and accurate information.
APIs, like messengers for applications, standardize interactions between digital systems. They specify formats, languages, and cybersecurity measures, allowing seamless communication and data exchange.
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