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Square MCP server

Reachable · auth required

Square’s server for payments, catalog, orders, and customers. Requires authentication.

Last checked by Merlonix at Jul 7, 2026, 09:40 PM UTC with a real Model Context Protocol handshake. This is a point-in-time check, not real-time — check Square live now.

Independent directory maintained by Merlonix. Not affiliated with, endorsed by, or operated by Square. This health check is Merlonix’s own point-in-time observation of a public endpoint. Square is a trademark of its respective owner and is named here only to describe what we checked.

Live health check

What Merlonix observed when it opened a real MCP session with Square — the transport, protocol generation, authentication posture, and (for open servers) the callable tool inventory.

Status (last checked)Reachable · auth required
Endpointhttps://mcp.squareup.com/sse
TransportStreamable HTTP
Spec generationUnknown
Protocol version—
Handshake latency103 ms
AuthenticationRequired (credential needed)
Handshake completedNo
tools/list answeredNo
Tools advertisedBehind auth
Security postureAgrade
Server info—

Squareanswered but requires a credential (401/403), so Merlonix couldn’t read its tool inventory behind the auth wall. That is normal and healthy for a production server — it means the endpoint is live and gated. Add your token in the live checker for a full behind-the-auth report.

Re-check Square live →Square homepage ↗

Embed a live health badge

Add a live, self-updating MCP health badge to Square’s README or docs. It re-checks on load (cached ~10 min) and links back to this page.

Live MCP health badge for SquareLive preview
<a href="https://merlonix.com/mcp-directory/square/">
  <img src="https://api.merlonix.com/v1/public/mcp-badge.svg?url=https%3A%2F%2Fmcp.squareup.com%2Fsse" alt="Square MCP health — Merlonix" height="20" />
</a>

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