Square MCP Server
Connect to Square for payment processing, inventory management, and point-of-sale operations.
- Maintained by
- Square
- Hosting
- Hosted endpoint, or run it locally
- Authentication
- OAuth sign-in
- Last checked
Beta; only an SSE remote endpoint is documented.
How to connect the Square MCP server
Pick your AI client and paste the snippet. Swap the YOUR_… placeholders for your own values. New to this? Our guide to how MCP clients and servers fit together explains what each piece does.
Claude Code
claude mcp add --transport sse square https://mcp.squareup.com/sseThen run /mcp inside Claude Code and choose Authenticate to sign in.
Full Claude Code setup guide →Claude Desktop and claude.ai
Name: Square
Remote MCP server URL: https://mcp.squareup.com/sseCustom connectors need a Pro, Max, Team or Enterprise plan. On Team and Enterprise an owner adds them in admin settings.
Full Claude Desktop setup guide →Cursor
{
"mcpServers": {
"square": {
"url": "https://mcp.squareup.com/sse"
}
}
}VS Code
{
"servers": {
"square": {
"type": "sse",
"url": "https://mcp.squareup.com/sse"
}
}
}ChatGPT
Business, Enterprise and Edu plans (and Pro, read-only) can add this endpoint as an app in developer mode. ChatGPT setup guide →
+ − Run it locally instead
Claude Code
claude mcp add --env ACCESS_TOKEN=YOUR_SQUARE_ACCESS_TOKEN --transport stdio square \
-- npx square-mcp-server startClaude Desktop
{
"mcpServers": {
"square": {
"command": "npx",
"args": [
"square-mcp-server",
"start"
],
"env": {
"ACCESS_TOKEN": "YOUR_SQUARE_ACCESS_TOKEN"
}
}
}
}Fully quit and reopen Claude Desktop after saving.
Full Claude Desktop setup guide →Cursor
{
"mcpServers": {
"square": {
"command": "npx",
"args": [
"square-mcp-server",
"start"
],
"env": {
"ACCESS_TOKEN": "YOUR_SQUARE_ACCESS_TOKEN"
}
}
}
}VS Code
{
"servers": {
"square": {
"type": "stdio",
"command": "npx",
"args": [
"square-mcp-server",
"start"
],
"env": {
"ACCESS_TOKEN": "YOUR_SQUARE_ACCESS_TOKEN"
}
}
}
}Frequently asked questions
What is the Square MCP server?
It is a Model Context Protocol (MCP) server — a small piece of software that gives AI assistants like Claude a secure, governed connection to Square. Connect to Square for payment processing, inventory management, and point-of-sale operations.
Is there an official Square MCP server?
Yes. The Square MCP server is an official integration, maintained by the vendor or the Model Context Protocol project, which makes it the safest default for business use. It is maintained by Square.
Is the Square MCP server hosted, or do I run it myself?
Both. Square runs a hosted endpoint at https://mcp.squareup.com/sse, so most people just paste that URL into their AI client. You can also run the server locally with npx, supplying your own credentials.
Do I need an API key for the Square MCP server?
No API key is needed for the hosted server. You sign in through Square's own OAuth screen, and the assistant only gets the access your account has.
What can an AI assistant actually do with Square?
Through this server an assistant can work with payments, inventory, pos, customers — reading from and acting on Square directly instead of you copy-pasting between windows. What you allow it to do is controlled by the permissions you grant.
How do I set this up for my business?
The setup section above has copy-paste config for Claude Code, Claude Desktop, Cursor and VS Code. Once it is running against real systems, the question becomes what catches it when it acts wrongly, which is what Crox's Safety Diagnostic looks at.
New to MCP? Start with our plain-English guide to the Model Context Protocol or see how to connect AI to your business tools without writing code .
Already running this in production?
An agent with a live connection to your tools is a model that can act. Crox looks at what catches it when it acts wrongly: the layers around it, who can stop it, and where a near miss gets reported. Two days, one team, one model.