Square Point of Sale API
Square POS sits on a first-class developer platform: more than 20 REST APIs plus two POS-specific surfaces, the Point of Sale API for app deep-links and the Terminal API for hardware control. Registration, sandbox, and API access are self-serve and free; merchants pay processing fees.
Frequently asked questions
Square Point of Sale scores A on Supergood's API Report Card. Square POS sits on a first-class developer platform: more than 20 REST APIs plus two POS-specific surfaces, the Point of Sale API for app deep-links and the Terminal API for hardware control. Registration, sandbox, and API access are self-serve and free; merchants pay processing fees.
Square Point of Sale has a workable official integration path. Most engineering teams can build against it directly. Open API: self-serve, documented, with SDKs
Square Point of Sale is the flagship SMB POS and payments product from Block, Inc. (NYSE: XYZ; formerly Square, Inc.).
General-purpose POS with vertical-specific editions. A merchant signs up online in minutes, plugs in a Square Reader or buys a Terminal/Register, and begins taking card, tap, and contactless payments the same day.
Very high. Square is one of the two or three best-known POS brands globally, ubiquitous in US small-business retail and hospitality, and one of the standard integrations expected of any commerce/accounting/marketing/data SaaS.
Parent: Block, Inc. (NYSE: XYZ), public, headquartered in Oakland/San Francisco. Founders: Jack Dorsey, Jim McKelvey; founded 2009. Q1 2025 Square ecosystem gross profit: ~$898M (+9% YoY); international GPV +15% YoY; mid-market sellers (>$500K/yr) ~41% of GPV.
Founded 2009 by Jack Dorsey and Jim McKelvey; Square IPO'd 2015 and rebranded the parent company to Block, Inc. in late 2021.
Supergood's grades measure one thing: can a customer's engineering team get their own data out programmatically? Supergood checks six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and rolls them into a letter grade. Supergood re-verifies grades, and they only move on evidence.
Square Point of Sale scores GOOD on MCP availability. Square publishes an official MCP server in beta, with a hosted remote at mcp.squareup.com and setup instructions in the Square developer docs. It spans 40+ Square services behind the point of sale, including payments, orders, customers, and inventory.
Yes. Square Point of Sale publishes an official MCP server, so MCP clients like Claude, Cursor, and Codex can connect to it directly. Setup instructions are in the vendor's documentation.