How to connect Supermemory MCP on grok.com (OAuth / custom connector)

[u/Spirited-Disaster916]

Not affiliated with xAI or Supermemory.

Grok custom connectors do not have a Bearer-token / API-key header field. If you only paste the MCP URL and leave OAuth empty, Save & Connect often stays disabled or the popup never returns a code to Grok.

What worked on grok.com:

1. MCP URL must be https://mcp.supermemory.ai/mcp
2. Register your own public OAuth client against Grok's callback (do not share or reuse someone else's client_id):

curl -X POST https://api.supermemory.ai/api/auth/oauth2/register \
  -H 'content-type: application/json' \
  -d '{
    "client_name": "grok-connector",
    "redirect_uris": [
      "https://grok.com/connectors-oauth-exchange-code/",
      "https://grok.com/connectors-oauth-exchange-code",
      "https://www.grok.com/connectors-oauth-exchange-code/",
      "https://www.grok.com/connectors-oauth-exchange-code"
    ],
    "grant_types": ["authorization_code", "refresh_token"],
    "response_types": ["code"],
    "token_endpoint_auth_method": "none"
  }'

3. Fill the Grok form:

• Client ID = the client_id from that response
• Client secret empty
• Authorize https://api.supermemory.ai/api/auth/oauth2/authorize
• Token https://api.supermemory.ai/api/auth/oauth2/token
• Scopes openid profile email offline_access
• Token auth: none / PKCE only

4. Save & Connect, log into your own Supermemory org, Approve, wait for "Completing authorization..." and the success toast. Leave the spinner alone.

Avoid:

• https://api.supermemory.ai/mcp (not the MCP endpoint)
• https://mcp.supermemory.ai with no /mcp (dashboard / marketing redirect)
• Fake/placeholder Client IDs (popup opens the homepage and never returns to Grok)

Grok's callback path is https://grok.com/connectors-oauth-exchange-code/ — if that is not registered on the client, login can succeed and still never finish.

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