Square MCP Server (beta)

Official

Full Square API: customers, orders, catalog items, payments, invoices

Details

Vendor

Square

Type

Official

Category

Payments and financing

Endpoint

https://mcp.squareup.com/mcp

Auth

OAuth (remote); access token (local)

Transport

remote HTTP; stdio (local)

Spec version

Not stated by the vendor

Code repo

https://github.com/square/square-mcp-server

Official MCP registry

Not listed

Also through

Zapier; Composio

Tools

Full Square API: customers, orders, catalog items, payments, invoices

Our live check

Result

Live (sign-in required), checked Oct 4, 2026

What came back

401 with OAuth protected-resource metadata

Publisher

Matches the vendor

mcp.squareup.com

Docs read

Oct 3, 2026

We send one MCP initialize call and nothing else. A 401 that points to OAuth counts as live: the server answers, and you sign in to use it.

Notes

Beta. Remote endpoint has a client allowlist. Local npm square-mcp-server.

Source

https://developer.squareup.com/docs/mcp