HYDRAFETCH_API_KEY environment variable when you do not pass one.
Server SDKs
Agent frameworks
For agents that speak MCP, connect to
https://api.hydrafetch.com/mcp instead. It lists its tools at /mcp/tools.
In the browser
Logos are the one thing meant to be loaded from a web page. These packages build logo image URLs from a publishable key, which is safe to ship to the browser. Never put your secret API key in browser code.
See Logo for how logo images are served and billed.