API keys

You don't need a key today. Facts are free and keyless, and decisions are free during early access. Just call the REST API or connect the MCP server.

When keys arrive #

Keys come with metering for the decision layer. When they do:

• One key will work for both the REST API and the MCP server.
• Send it as Authorization: Bearer kc_live_… or X-KaiCast-Key: kc_live_… — never in a URL. kc_test_… keys will be for testing and never billed.
• Facts stay free and keyless.
• Registered developers get notice before anything changes, and sign-up will be plain HTTP so an agent can complete it with one human step (reading an emailed code).

Both endpoints already accept and ignore those headers, so you can wire the header in now without breaking anything.

Get notified #

Email dawson@kaicast.com with what you're building. Volume, partnerships and new regions go to the same address.