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What is API key?

Also called: Secret key

An API key is like a password for an API. Anyone who has it can use the service at your expense.

Example

A developer adds the key to their app so it may use the AI.

For pros

Never publish keys in code repositories, web pages or chats. Set spending limits, use separate keys per project and rotate them at once if in doubt.

Sources: help.openai.com, Wikipedia · Checked on 19 October 2026

Written by AI Compare Ninja with AI assistance and edited by us. Every explanation is our own text.