An “application programming interface”, or API is a set of rules and tools that allows different software programs to safely talk to one another. An API in crypto is just a structured way for apps, exchanges, and wallets to communicate with blockchains or crypto services by asking for data or performing actions in a standard, automated way. It skips the technical blockchain details and lets developers use straightforward commands.
An API defines what requests you can make (endpoints), what information you must send (inputs), and what you will get back (outputs), often in formats like JSON or XML. It also includes rules about security, like API keys, which put a limit on how often you can call it, and clear documentation that tells developers how to use it. Basically, it can request data or ask for an action without needing to understand the internal workings of the other program.
A crypto market data API like CoinMarketCap lets an app request prices, volumes, and market caps for coins in real time with one call. For example, a portfolio‑tracking app can quickly grab Bitcoin and Ethereum prices from the API instead of checking multiple exchanges.
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