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Every hosted MCP request requires an API key.

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Get an API key

  1. Sign in at the developer dashboard.
  2. Create a key on the API Keys page.
  3. Keys start with sk_live_ — treat them like passwords.

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MCP authentication

Connect to https://mcp.vespper.com/mcp with your key in the Authorization header: 
Authorization: Bearer sk_live_YOUR_KEY
Most examples use an environment variable: 
export VESPPER_API_KEY=sk_live_YOUR_KEY
How you set this depends on your stack — see the Quickstart for Cursor, Codex CLI, Gemini CLI, Copilot CLI, Claude Desktop, SDK, and raw MCP client examples.

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Security

Never commit API keys to git or expose them in client-side code. Keys authenticate as the account owner and count toward usage credits.
If a key is leaked, revoke it in the dashboard and create a new one.