Scripts & APIs

About 1 minute · MegaMCPs has not checked this client yet

1. 1
   Create an API key on your dashboard (AI clients → API keys). It is shown once: keep it in a secret store.
2. 2
   OpenAI Responses API: add this to the tools of every request, follow-ups with previous_response_id included.

   {
     "type": "mcp",
     "server_label": "megamcps",
     "server_url": "https://mcp.megamcps.com/mcp",
     "headers": {
       "Authorization": "Bearer mmk_your_key"
     }
   }

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3. 3
   xAI Responses API (api.x.ai/v1/responses): the same entry. xAI's Python SDK calls the field extra_headers.

   {
     "type": "mcp",
     "server_label": "megamcps",
     "server_url": "https://mcp.megamcps.com/mcp",
     "headers": {
       "Authorization": "Bearer mmk_your_key"
     }
   }

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4. 4
   n8n: in an MCP Client node, use these settings and save the header as a Header Auth credential.

   MCP Endpoint URL: https://mcp.megamcps.com/mcp
   Server Transport: HTTP Streamable
   Authentication: Header Auth
   Name: Authorization
   Value: Bearer mmk_your_key

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5. 5
   Check a key with curl. A reply containing "serverInfo":{"name":"megamcps" means it works. X-API-Key: mmk_your_key works as well as Authorization.

   curl -sS https://mcp.megamcps.com/mcp \
     -H "Authorization: Bearer mmk_your_key" \
     -H "Content-Type: application/json" \
     -H "Accept: application/json, text/event-stream" \
     -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-11-25","capabilities":{},"clientInfo":{"name":"curl","version":"1"}}}'

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Good to know

• ChatGPT and claude.ai sign in instead; they don't take API keys.
• An account can have 20 live API keys.

If it doesn't work

• 401 means the key is wrong or revoked. A rejected key never falls back to sign-in.
• OpenAI asks before every tool call by default (mcp_approval_request). Answer it, or add "require_approval": "never" once you trust the tools.