Square for Retail API
Square for Retail runs on the Square developer platform: more than 20 REST APIs covering catalog, inventory counts and transfers, orders, customers, and loyalty. Access is free and self-serve with OAuth 2.0 merchant scopes, six official SDKs, a sandbox, webhooks, and a GraphQL Explorer.
Frequently asked questions
Square for Retail scores A on the API Report Card. Square for Retail runs on the Square developer platform: more than 20 REST APIs covering catalog, inventory counts and transfers, orders, customers, and loyalty. Access is free and self-serve with OAuth 2.0 merchant scopes, six official SDKs, a sandbox, webhooks, and a GraphQL Explorer.
Square for Retail has a workable official integration path. Most engineering teams can build against it directly. Open API: self-serve, documented, with SDKs
Square for Retail is Block, Inc.'s retail-specific edition of the Square POS, purpose-built for specialty and small-format retailers.
Vertical POS for specialty retail. A boutique signs up online, picks hardware (Register/Terminal/Stand plus barcode scanner and label printer), and imports a catalog from spreadsheet, Shopify, or another POS.
Very high in SMB and lower-mid-market specialty retail. Square is one of the most recognized POS brands in North America for independent retail alongside Shopify POS, Lightspeed Retail, and Clover.
Parent: Block, Inc. (NYSE: XYZ), public, HQ Oakland/San Francisco; founders Jack Dorsey, Jim McKelvey (Square founded 2009). Square for Retail launched 2017; unified Free/Plus/Premium plans rolled out October 2025.
Square was founded in 2009 by Jack Dorsey and Jim McKelvey, IPO'd in 2015, and rebranded as Block, Inc. in late 2021.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.