Guide, checked by hand on
How to connect Square to Claude
Payments, orders, customers, catalogue and inventory in your Square account.
The address
https://mcp.squareup.com/mcp- Made by
- Square
- Sign-in
- OAuth (sign in with Square)
- Transport
- Streamable HTTP
Square lets only clients on its allowlist sign in, and the hosted server works on production data only (use Square's local server with SANDBOX=true to try things).
What it can do
- Look up payments, orders and customers
- Read and update the catalogue and stock
- Work with invoices, bookings and loyalty
How to add Square to Claude
- In Claude on the web or desktop, open Customize, then Connectors (Settings > Connectors in some versions).
- Press + Add, then Add custom connector.
- Name it Square, paste the address and press Continue.
- Keep the sign-in Claude detects (usually Sign in when needed) and press Add.
- Press Connect next to it and sign in if it asks.
- In a chat, press +, then Connectors, to switch it on.
On your phone: connectors belong to your Claude account. Add it once on claude.ai or in the desktop app, and it is in the Claude app for iPhone and Android too: in a chat, press +, then Connectors, and switch it on.
Claude's free plan allows one custom connector; paid plans allow more. On Team and Enterprise plans an owner adds it once under Organization settings > Connectors, and each member then presses Connect. Claude's help page
How to add it to ChatGPT
- On chatgpt.com, on a Plus, Pro, Business, Enterprise or Edu plan, turn on Developer mode (Settings > Security and login, or Settings > Apps > Advanced settings in some versions).
- Open Settings > Apps and create an app (the + or Create button).
- Name it Square, paste the address, choose OAuth (or No authentication if the server is open) and press Create.
- Sign in when it asks.
- In a new chat, press + and pick Square.
ChatGPT's menus move now and then; the idea stays the same: a new app, this address, OAuth. On business plans an admin may have to allow custom apps first.
Claude Code
claude mcp add --transport http square https://mcp.squareup.com/mcpThen run /mcp in Claude Code to sign in.
Try asking
- "What sold best this week?"
- "Which items are low in stock?"
Good to know
- Production data: read write actions before you approve them.