Which is better for in-person and omnichannel commerce?

Square — its server exposes the full Square API including catalog, inventory, and bookings, tied to Square's point-of-sale ecosystem. PayPal centers on online invoicing, orders, and payments.

Is either server remote or local?

PayPal's official server is remote, with no local process. Square's official server runs locally over stdio against the Square API.

PayPal vs Square

PayPal MCP and Square MCP both let an agent operate a payments platform, but they reflect two different commerce worlds. PayPal's official server is remote and oriented toward digital commerce workflows: invoicing, orders, and payments — create and send invoices, generate invoice QR codes, initiate orders, and capture payments — fitting businesses that bill and collect online. Square's official server runs locally over stdio and exposes the full Square API: payments, catalog, orders, customers, bookings, and inventory, reflecting Square's omnichannel model that bridges online and in-person commerce through its point-of-sale ecosystem. Both let an agent move money and manage commerce objects, so the decision turns on whether your business is invoice-and-online-payments centric (PayPal) or omnichannel with catalog, bookings, and physical-world point-of-sale (Square), and whether a remote endpoint or a local stdio server suits your setup.

How they compare

Dimension	PayPal	Square
Commerce model	Digital commerce: invoicing, orders, and online payments for businesses that bill and collect over the web.	Omnichannel: payments, catalog, orders, customers, bookings, and inventory bridging online and in-person.
Deployment	Official remote MCP server — no local process; the agent reaches PayPal's hosted endpoint.	Official server run locally over stdio against the Square API.
Signature surface	Invoices (create, send, reminders, QR codes) plus create-order and capture-payment flows.	Broad Square API: catalog and inventory, orders, customers, and bookings alongside payments.
Physical-world fit	Focused on online payment and invoicing rather than point-of-sale hardware.	Strong: ties into Square's POS and in-person ecosystem, so catalog and bookings reflect physical commerce.
Best-fit task	Automating invoicing and online order/payment capture for a PayPal-based business.	Operating an omnichannel Square business — managing catalog, inventory, bookings, and payments from an agent.

Verdict

Pick by how your business takes money. Reach for PayPal MCP when your commerce is online and invoice-driven and you want an agent to create and send invoices, generate QR codes, and initiate and capture orders through an official remote server. Reach for Square MCP when you run an omnichannel business — especially with physical point-of-sale — and want a local server reaching the full Square API: payments, catalog, orders, customers, bookings, and inventory. In short: PayPal for digital invoicing and online payments; Square for omnichannel commerce that bridges online and in-person operations.

FAQ

Which is better for in-person and omnichannel commerce?: Square — its server exposes the full Square API including catalog, inventory, and bookings, tied to Square's point-of-sale ecosystem. PayPal centers on online invoicing, orders, and payments.
Is either server remote or local?: PayPal's official server is remote, with no local process. Square's official server runs locally over stdio against the Square API.