Your assistant already knows how credit cards work. Now it can know yours. Connect Cardful to Claude, ChatGPT, Muse or any assistant that supports remote MCP, and ask about your cards, credits, offers, points and 5/24 standing — read-only, from the wallet you already track.
The server
Add this URL as a custom connector. Your assistant will send you to Cardful to sign in with Apple and approve the connection; nothing else to configure.
https://wyahrkqoxerdpznxndfl.supabase.co/functions/v1/mcpRequires Cardful Premium. Free accounts can connect, but every question answers with an upgrade note until Premium is on (Settings → Premium in the app).
Set it up
Claude
- On claude.ai or in the Claude app, open Settings → Connectors and choose Add custom connector.
- Name it Cardful, paste the URL above, and add it.
- Click Connect. Cardful asks you to sign in with Apple — use the same Apple ID as the app — then approve.
- If Claude offers it, choose Always allow so it can read your wallet without asking each time.
ChatGPT
- On a plan that supports custom apps, open Settings → Apps & connectors and turn on Developer mode if your plan asks for it.
- Create a custom connector named Cardful with the URL above.
- Sign in with Apple when Cardful asks, then approve.
Meta Muse and other assistants
- Paste the URL and ask the assistant to add it as a connector (or use its connector settings).
- Approve the connector, then sign in with Apple when Cardful asks.
Then ask
- “Which of my credits expire this month?”
- “Which card should I use for groceries?”
- “What are my points worth?”
- “Do I have any offers at Chipotle?”
- “Am I under 5/24?”
What it can see, and what it can’t
Read-only means read-only. The connection exposes six tools: your cards and fees, credits and their status, offers, points balances, best card for a category, and 5/24 standing. It cannot add a card, log a credit, change a balance, or touch anything in your wallet — and it never sees bank credentials, because Cardful doesn’t have any.
Cardful sends the assistant only the data needed to answer the question you asked. From there the assistant provider’s own data, retention and privacy policies apply to that conversation, so review those settings with the provider you choose.
Disconnecting
Remove Cardful from your assistant’s connector settings, or revoke the connection in the app under Settings → AI assistants. Revoking invalidates the assistant’s access immediately.
For developers
The server speaks MCP over Streamable HTTP with OAuth 2.1 (dynamic client registration, PKCE, RFC 9728 resource metadata). Protected-resource metadata lives at https://wyahrkqoxerdpznxndfl.supabase.co/functions/v1/mcp/.well-known/oauth-protected-resource.