Square
Square provides APIs for payment processing, point of sale, and business management solutions enabling developers to build custom commerce applications.
Reference-quality API operations across every facet — a rich contract, published governance, transparent operations, and machine-readable commercial terms.
API Evangelist profiles Square the way a machine reads it — 117 machine-readable artifacts across 45 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Square scores 76.7/100 (exemplar), with a separate agent-readiness read of 80/100 (agent native). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Square
Each block below is one kind of artifact we hold for Square. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 45
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Square Reporting API
The Reporting API (Beta) provides a new way to access all of a business's data to build custom reports and integrations, surfacing sales, payments, and operational metrics acros...
Square Channels API
The Channels API lets applications represent and manage the sales channels through which a seller transacts, enabling attribution of orders and payments to specific online or in...
Square Transfer Orders API
The Transfer Orders API lets applications create and manage transfers of inventory stock between a seller's locations, supporting multi-location retail and restaurant operations.
Square ApplePay API
The ApplePay API from Square — 1 operation(s) for applepay.
Square BankAccounts API
The BankAccounts API from Square — 3 operation(s) for bankaccounts.
Square BookingCustomAttributes API
The BookingCustomAttributes API from Square — 6 operation(s) for bookingcustomattributes.
Square Bookings API
The Bookings API from Square — 11 operation(s) for bookings.
Square Cards API
The Cards API from Square — 3 operation(s) for cards.
Square CashDrawers API
The CashDrawers API from Square — 3 operation(s) for cashdrawers.
Square Catalog API
The Catalog API from Square — 13 operation(s) for catalog.
Square Checkout API
The Checkout API from Square — 5 operation(s) for checkout.
Square CustomerCustomAttributes API
The CustomerCustomAttributes API from Square — 5 operation(s) for customercustomattributes.
Square CustomerGroups API
The CustomerGroups API from Square — 2 operation(s) for customergroups.
Square Customers API
The Customers API from Square — 10 operation(s) for customers.
Square CustomerSegments API
The CustomerSegments API from Square — 2 operation(s) for customersegments.
Square Devices API
The Devices API from Square — 4 operation(s) for devices.
Square Disputes API
The Disputes API from Square — 8 operation(s) for disputes.
Square Employees API
The Employees API from Square — 2 operation(s) for employees.
Square Events API
The Events API from Square — 4 operation(s) for events.
Square GiftCardActivities API
The GiftCardActivities API from Square — 1 operation(s) for giftcardactivities.
Square GiftCards API
The GiftCards API from Square — 6 operation(s) for giftcards.
Square Inventory API
The Inventory API from Square — 13 operation(s) for inventory.
Square Invoices API
The Invoices API from Square — 7 operation(s) for invoices.
Square Labor API
The Labor API from Square — 11 operation(s) for labor.
Square LocationCustomAttributes API
The LocationCustomAttributes API from Square — 6 operation(s) for locationcustomattributes.
Square Locations API
The Locations API from Square — 2 operation(s) for locations.
Square Loyalty API
The Loyalty API from Square — 16 operation(s) for loyalty.
Square MerchantCustomAttributes API
The MerchantCustomAttributes API from Square — 6 operation(s) for merchantcustomattributes.
Square Merchants API
The Merchants API from Square — 2 operation(s) for merchants.
Square MobileAuthorization API
The MobileAuthorization API from Square — 1 operation(s) for mobileauthorization.
Square OAuth API
The OAuth API from Square — 3 operation(s) for oauth.
Square OrderCustomAttributes API
The OrderCustomAttributes API from Square — 6 operation(s) for ordercustomattributes.
Square Orders API
The Orders API from Square — 7 operation(s) for orders.
Square Payments API
The Payments API from Square — 5 operation(s) for payments.
Square Payouts API
The Payouts API from Square — 3 operation(s) for payouts.
Square Refunds API
The Refunds API from Square — 2 operation(s) for refunds.
Square Sites API
The Sites API from Square — 1 operation(s) for sites.
Square Snippets API
The Snippets API from Square — 1 operation(s) for snippets.
Square Subscriptions API
The Subscriptions API from Square — 11 operation(s) for subscriptions.
Square Team API
The Team API from Square — 8 operation(s) for team.
Square Terminal API
The Terminal API from Square — 15 operation(s) for terminal.
Square Transactions API
The Transactions API from Square — 4 operation(s) for transactions.
Square V1Transactions API
The V1Transactions API from Square — 2 operation(s) for v1transactions.
Square Vendors API
The Vendors API from Square — 6 operation(s) for vendors.
Square WebhookSubscriptions API
The WebhookSubscriptions API from Square — 5 operation(s) for webhooksubscriptions.
Scroll within the panel for all 45 ·
Open Collections 1
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Square
OPEN COLLECTIONMCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
MCP Server
MCP SERVERGraphQL 1
Where a provider ships GraphQL, the schema is the contract. We profile it alongside the REST surface so the whole interface is legible in one place.
GraphQL schemas published by this provider.
Square GraphQL Schema
This conceptual GraphQL schema models the Square payments and commerce platform. Square provides APIs for payment processing, point of sale, catalog management, inventory, custo...
GRAPHQLPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Square Plans Pricing
PLANSRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Square Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Square Finops
FINOPSFeatures 16
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Scroll within the panel for all 16 ·
Event Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Square Webhooks
AsyncAPI 2.6 description of the Square webhook event surface. Square delivers HTTPS POST notifications to a subscriber-provided `notification_url` whenever an event occurs on a ...
ASYNCAPISemantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Square Context
JSON-LDSpectral Rules 3
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
JSON Schema 7
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
Square Catalog Item
JSON SCHEMASquare Customer
JSON SCHEMASquare Location
JSON SCHEMASquare Money
JSON SCHEMASquare Order
JSON SCHEMASquare Payment
JSON SCHEMASquare Subscription
JSON SCHEMAScroll within the panel for all 7 ·
JSON Structure 7
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Catalog Item Structure
JSON STRUCTURECustomer Structure
JSON STRUCTURELocation Structure
JSON STRUCTUREMoney Structure
JSON STRUCTUREOrder Structure
JSON STRUCTUREPayment Structure
JSON STRUCTURESubscription Structure
JSON STRUCTUREScroll within the panel for all 7 ·
Examples 7
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Catalog Item Example
EXAMPLECustomer Example
EXAMPLELocation Example
EXAMPLEMoney Example
EXAMPLEOrder Example
EXAMPLEPayment Example
EXAMPLESubscription Example
EXAMPLEScroll within the panel for all 7 ·
Security Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 11
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
Accept Payments Online
Build Custom POS Systems
Manage Product Catalogs
Track Inventory Across Locations
Create Loyalty and Rewards Programs
Send and Manage Invoices
Schedule Appointments and Bookings
Manage Team Members and Labor
Process Refunds and Disputes
Sell Gift Cards
Set Up Recurring Subscriptions
Scroll within the panel for all 11 ·
Integrations 8
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
Apple Pay
Google Pay
Cash App Pay
Afterpay
QuickBooks
WooCommerce
Wix
BigCommerce
Scroll within the panel for all 8 ·
Resources
Every other property we hold for Square — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 8
Portal, sign-up, and the first successful call
Scroll within the panel for all 8 ·
Documentation 15
Reference material describing how the API behaves
Scroll within the panel for all 15 ·
Agent Surfaces 3
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 14
Pagination, idempotency, versioning, errors, and events
Scroll within the panel for all 14 ·
Build 30
SDKs, sample code, and the tooling you integrate with
Scroll within the panel for all 30 ·
Access & Security 5
Authentication, authorization, and security posture
Operate 9
Status, limits, changes, and where to get help
Scroll within the panel for all 9 ·
Commercial 5
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/square · machine-readable index on apis.io