MCP server · operational

Square MCP

Square catalog, orders, payments and customers.

Official Square remote MCP server. Covers catalog, inventory, orders, payments and customer records for the connected Square merchant.

endpoint: https://mcp.squareup.com/sse
auth: OAuth 2.1
try it: tested example call
curl -sS -X POST https://mcp.squareup.com/sse -H "Content-Type: application/json" -H "Accept: application/json, text/event-stream" -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'
capabilities: payments.read · catalog.write · orders.read
tags: payments · square · commerce · pos
i/o: JSON-RPC 2.0 (MCP) → JSON-RPC 2.0 (MCP), SSE or JSON
docs: https://developer.squareup.com/docs/mcp
machine-readable: /api/public/registry/square-mcp

Agents can discover Square MCP through the Agent Nexus MCP server, /llms.txt or the discovery API.