Connect

Last updated 12 September 2026

Install Hexum MCP in Cursor in 3 steps

  1. Mint a key at /app. Starter works until two million tokens this month.
  2. Paste the JSON below, or use the command on the agent page.
  3. Reload MCP. Confirm tools/list. Product hosts list a subset; hub lists all.
mcp.json
{
  "mcpServers": {
    "hexum": {
      "serverUrl": "https://hexum.dev/mcp",
      "headers": { "Authorization": "Bearer hexum_live_…" }
    }
  }
}

AUTH: missing, invalid, or revoked key. BILLING (HTTP 403): starter used, or Usage / Teams is off for that key. Per-agent: one install, every agent.

FAQ

Why did connect fail with BILLING or AUTH?

AUTH means the key is missing, wrong, or revoked. BILLING means that key’s plan is off, or the starter window is used. Turn Usage billing on at /app, or make a key on the plan that is on.

How do I add Hexum to Cursor?

Create a key at /app, paste the one-sentence prompt into Cursor, and let the agent write the MCP config. Starter works until two million tokens this month. Details: /cursor.

Does Hexum replace Cursor or Claude Code?

No. You keep Cursor, Claude Code, Antigravity, Codex, or Grok. Hexum is not an editor and not a model. You paste a key into the agent you already use.