Block

Block, Inc. is a global technology company building economic empowerment tools through a family of products including Square (commerce and payments), Cash App (personal finance and investing), Afterpay (buy now pay later), TIDAL (music streaming), and Spiral (open-source Bitcoin development). The Square API enables developers to build commerce applications with payment processing, order management, catalog, customer engagement, and business operations capabilities.

Block publishes 5 APIs on the APIs.io network, including Catalog API, Customers API, Merchants API, and 2 more. Tagged areas include Commerce, Cryptocurrency, E-Commerce, Fintech, and Payments.

The Block catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Block’s developer surface includes engineering blog, sandbox, changelog, authentication, documentation, getting-started guide, pricing, and 31 more developer resources.

🌐 Visit website 📡 Source on GitHub

44.3/100 developing ▬ flat Agent 41/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

5 APIs 1 MCP Servers 7 Features 5 Use Cases

Commerce Cryptocurrency E-Commerce Fintech Payments Point-of-Sale Square

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 44.3/100 · developing

Contract Quality 3.7 / 19

Developer Ergonomics 8.4 / 15

Access Clarity 4.9 / 15

Operational Transparency 4.9 / 10

Contract Governance 2.6 / 9

Discoverability 5.4 / 8

Regulatory Posture 7.3 / 15

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 41/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Payments regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/block: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

Block Catalog API

Manage product catalog

Block Customers API

Customer management and engagement

Block Merchants API

Merchant and location data

Block Orders API

Create and manage orders

Block Payments API

Process and manage payments

Postman Collections 1

Ready-to-run Postman collections for exercising this provider's APIs.

Square API

POSTMAN

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Square Catalog API

OPEN COLLECTION

Square Catalog Customers API

OPEN COLLECTION

Square Catalog Merchants API

OPEN COLLECTION

Square Catalog Orders API

OPEN COLLECTION

Square Catalog Payments API

OPEN COLLECTION

Arazzo Workflows 13

Multi-step API workflows described with the Arazzo specification.

Block Square Catalog Browse And Order Verify

Browse catalog items, open an order, and branch on whether the order is OPEN.

ARAZZO

Block Square Catalog Driven Order

Browse the catalog, build an order from a selected item, and capture payment.

ARAZZO

Block Square Catalog To Customer Order

Browse the catalog, create a customer, and open an order for them.

ARAZZO

Block Square Customer Order Then Pay

Create an order, branch on its state, and only take payment when it is OPEN.

ARAZZO

Block Square Customer Payment Audit

Pull a customer roster, list payments for a location, and detail the latest one.

ARAZZO

Block Square Full Commerce Flow

Resolve a location, create a customer, place an order, take payment, and verify it.

ARAZZO

Block Square Location First Sale

Resolve the active seller location, open an order there, and take payment.

ARAZZO

Block Square Location Payment Reconciliation

Resolve a location, list its recent payments, and detail the most recent one.

ARAZZO

Block Square New Customer Checkout

Create a customer, place an order for them, then capture payment for that order.

ARAZZO

Block Square Onboard Customer And Charge

Resolve a location, create a customer, and charge a direct payment to them.

ARAZZO

Block Square Reconcile Payment

List recent payments for a location and pull full detail on the most recent one.

ARAZZO

Block Square Returning Customer Checkout

Find an existing customer or create one, then place and pay for their order.

ARAZZO

Block Square Take Payment And Verify

Take a card payment and immediately re-read it to confirm the final status.

ARAZZO

Scroll for all 13

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Block MCP Server

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Block Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Block Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Block Finops

FINOPS

Features 7

Notable capabilities this provider offers.

Payment Processing

Accept card-present and card-not-present payments using Square hardware, web, or mobile SDKs with OAuth 2.0 or access token authentication.

Order Management

Create, update, and fulfill orders with line items, discounts, taxes, and service charges across online and in-person channels.

Catalog Management

Manage a unified product catalog with items, variations, modifiers, categories, taxes, and discounts synchronized across all locations.

Customer Engagement

Build customer profiles, loyalty programs, gift cards, and marketing campaigns to drive repeat business and customer retention.

Multi-Location Support

Manage multiple business locations with location-specific inventory, pricing, staff permissions, and reporting.

Webhook Events

Subscribe to real-time webhook events for payments, orders, inventory changes, customer activity, and subscription lifecycle events.

Sandbox Environment

Full sandbox environment with test card numbers, merchant accounts, and simulated hardware for development and testing.

Scroll for all 7

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Block Context

35 classes · 0 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Block API Rules

5 rules · 4 warnings 1 info

SPECTRAL

Block API Rules

34 rules · 11 errors 20 warnings 3 info

SPECTRAL

JSON Schema 4

Standalone JSON Schema definitions for this provider's data models.

CatalogObject

4 properties

JSON SCHEMA

Customer

7 properties

JSON SCHEMA

Order

7 properties

JSON SCHEMA

Payment

8 properties

JSON SCHEMA

JSON Structure 4

JSON Structure definitions describing this provider's data shapes.

Block Catalog Object Structure

0 properties

JSON STRUCTURE

Block Customer Structure

0 properties

JSON STRUCTURE

Block Order Structure

0 properties

JSON STRUCTURE

Block Payment Structure

0 properties

JSON STRUCTURE

Examples 4

Example request and response payloads for these APIs.

Block Catalog Object Example

5 fields

EXAMPLE

Block Customer Example

13 fields

EXAMPLE

Block Order Example

12 fields

EXAMPLE

Block Payment Example

14 fields

EXAMPLE

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Block Authentication

http/oauth2 · 2 schemes

SECURITY

Block Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Block Scopes

6 scopes · authorizationCode

6 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Block Agentic Access

8 operations · 3 acting

AGENTIC

Use Cases 5

What developers build with this provider.

Point of Sale Integration

Retailers and restaurants build custom POS applications using Square's payment, catalog, and order APIs.

eCommerce Checkout

Online stores integrate Square's Web Payments SDK and Orders API to accept payments and manage fulfillment.

Marketplace Payments

Multi-seller marketplaces use Square Connect to route payments to sellers and manage fees through the Payouts API.

Subscription Billing

SaaS and service businesses use Square Subscriptions API for automated recurring billing and invoice management.

Loyalty and Rewards

Businesses implement custom loyalty programs using the Loyalty API to track points, tiers, and reward redemptions.

Integrations 4

Pre-built integrations with other platforms and tools.

WooCommerce

Official Square extension for WooCommerce synchronizes inventory, products, and payments between WordPress stores and Square.

BigCommerce

Square integration for BigCommerce enables omnichannel selling with synchronized catalog and unified payment processing.

Xero

Square-Xero integration automatically syncs sales transactions and payments to Xero accounting for reconciliation.

QuickBooks

Square connector for QuickBooks Online syncs sales, refunds, and fees to QuickBooks for financial reporting.

Resources

Get Started 3

Portal, sign-up, and the first successful call

Sandbox

Sandbox

GettingStarted

GettingStarted

Login

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

AgenticAccess

AgenticAccess

Design & Contract 16

Pagination, idempotency, versioning, errors, and events

Webhooks

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

Arazzo

SpectralRules

Vocabulary

Scroll for all 16

Build 3

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

GitHubOrganization

Square SDKs

SDKs

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

OAuthScopes

OAuthScopes

Operate 3

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

StatusPage

StatusPage

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Blog

Blog

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

Subsidiary

Subsidiary

Source (apis.yml)

aid: block
url: https://raw.githubusercontent.com/api-evangelist/block/refs/heads/main/apis.yml
name: Block
description: Block, Inc. is a global technology company building economic empowerment tools through a family of products including
  Square (commerce and payments), Cash App (personal finance and investing), Afterpay (buy now pay later), TIDAL (music streaming),
  and Spiral (open-source Bitcoin development). The Square API enables developers to build commerce applications with payment
  processing, order management, catalog, customer engagement, and business operations capabilities.
tags:
- Commerce
- Cryptocurrency
- E-Commerce
- Fintech
- Payments
- Point-of-Sale
- Square
tags_raw:
- Commerce
- Cryptocurrency
- eCommerce
- Fintech
- Payments
- Point Of Sale
- Square
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/block.png
access: 3rd-Party
created: '2024-09-27'
modified: '2026-05-19'
position: Consuming
specificationVersion: '0.23'
apis:
- aid: block:block-catalog-api
  name: Block Catalog API
  description: Manage product catalog
  humanURL: https://developer.squareup.com/
  tags:
  - Catalog
  properties:
  - type: OpenAPI
    url: openapi/block-catalog-api-openapi.yml
  - type: Documentation
    url: https://developer.squareup.com/docs
  - type: SpectralRules
    url: rules/block-spectral-rules.yml
  - type: Vocabulary
    url: vocabulary/block-vocabulary.yaml
- aid: block:block-customers-api
  name: Block Customers API
  description: Customer management and engagement
  humanURL: https://developer.squareup.com/
  tags:
  - Customers
  properties:
  - type: OpenAPI
    url: openapi/block-customers-api-openapi.yml
  - type: Documentation
    url: https://developer.squareup.com/docs
  - type: SpectralRules
    url: rules/block-spectral-rules.yml
  - type: Vocabulary
    url: vocabulary/block-vocabulary.yaml
- aid: block:block-merchants-api
  name: Block Merchants API
  description: Merchant and location data
  humanURL: https://developer.squareup.com/
  tags:
  - Merchants
  properties:
  - type: OpenAPI
    url: openapi/block-merchants-api-openapi.yml
  - type: Documentation
    url: https://developer.squareup.com/docs
  - type: SpectralRules
    url: rules/block-spectral-rules.yml
  - type: Vocabulary
    url: vocabulary/block-vocabulary.yaml
- aid: block:block-orders-api
  name: Block Orders API
  description: Create and manage orders
  humanURL: https://developer.squareup.com/
  tags:
  - Order
  tags_raw:
  - Orders
  properties:
  - type: OpenAPI
    url: openapi/block-orders-api-openapi.yml
  - type: Documentation
    url: https://developer.squareup.com/docs
  - type: SpectralRules
    url: rules/block-spectral-rules.yml
  - type: Vocabulary
    url: vocabulary/block-vocabulary.yaml
- aid: block:block-payments-api
  name: Block Payments API
  description: Process and manage payments
  humanURL: https://developer.squareup.com/
  tags:
  - Payments
  properties:
  - type: OpenAPI
    url: openapi/block-payments-api-openapi.yml
  - type: Documentation
    url: https://developer.squareup.com/docs
  - type: SpectralRules
    url: rules/block-spectral-rules.yml
  - type: Vocabulary
    url: vocabulary/block-vocabulary.yaml
common:
- type: Subsidiary
  name: Cash App
  url: https://cash.app/
- type: Blog
  url: https://block.xyz/news
- type: Webhooks
  url: https://developer.squareup.com/docs/webhooks/overview
- type: Sandbox
  url: https://developer.squareup.com/explorer
- type: MCPServer
  url: https://developer.squareup.com/docs/mcp
- type: ChangeLog
  url: https://developer.squareup.com/docs/release-notes
- type: AgenticAccess
  url: agentic-access/block-agentic-access.yml
- type: DomainSecurity
  url: security/block-domain-security.yml
- type: Authentication
  url: authentication/block-authentication.yml
- type: OAuthScopes
  url: scopes/block-scopes.yml
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/block/overview
- type: Arazzo
  url: arazzo/block-catalog-browse-and-order-verify-workflow.yml
  name: Block Square Catalog Browse And Order Verify
- type: Arazzo
  url: arazzo/block-catalog-driven-order-workflow.yml
  name: Block Square Catalog Driven Order
- type: Arazzo
  url: arazzo/block-catalog-to-customer-order-workflow.yml
  name: Block Square Catalog To Customer Order
- type: Arazzo
  url: arazzo/block-customer-order-then-pay-workflow.yml
  name: Block Square Customer Order Then Pay
- type: Arazzo
  url: arazzo/block-customer-payment-audit-workflow.yml
  name: Block Square Customer Payment Audit
- type: Arazzo
  url: arazzo/block-full-commerce-flow-workflow.yml
  name: Block Square Full Commerce Flow
- type: Arazzo
  url: arazzo/block-location-first-sale-workflow.yml
  name: Block Square Location First Sale
- type: Arazzo
  url: arazzo/block-location-payment-reconciliation-workflow.yml
  name: Block Square Location Payment Reconciliation
- type: Arazzo
  url: arazzo/block-new-customer-checkout-workflow.yml
  name: Block Square New Customer Checkout
- type: Arazzo
  url: arazzo/block-onboard-customer-and-charge-workflow.yml
  name: Block Square Onboard Customer And Charge
- type: Arazzo
  url: arazzo/block-reconcile-payment-workflow.yml
  name: Block Square Reconcile Payment
- type: Arazzo
  url: arazzo/block-returning-customer-checkout-workflow.yml
  name: Block Square Returning Customer Checkout
- type: Arazzo
  url: arazzo/block-take-payment-and-verify-workflow.yml
  name: Block Square Take Payment And Verify
- type: LinkedIn
  url: https://www.linkedin.com/company/joinblock
- type: Website
  url: https://www.block.xyz
- type: Documentation
  url: https://developer.squareup.com/docs
- type: GettingStarted
  url: https://developer.squareup.com/docs/get-started
- type: Pricing
  url: https://squareup.com/us/en/payments/our-rates
- type: StatusPage
  url: https://www.issquareup.com/
- type: Support
  url: https://developer.squareup.com/forums
- type: GitHubOrganization
  url: https://github.com/square
- type: TermsOfService
  url: https://squareup.com/us/en/legal/developer
- type: PrivacyPolicy
  url: https://squareup.com/us/en/legal/privacy
- type: Login
  url: https://developer.squareup.com/apps
- type: SDKs
  url: https://developer.squareup.com/docs/sdks
  title: Square SDKs
- type: SpectralRules
  url: rules/block-spectral-rules.yml
- type: Vocabulary
  url: vocabulary/block-vocabulary.yaml
- type: Features
  data:
  - name: Payment Processing
    description: Accept card-present and card-not-present payments using Square hardware, web, or mobile SDKs with OAuth 2.0
      or access token authentication.
  - name: Order Management
    description: Create, update, and fulfill orders with line items, discounts, taxes, and service charges across online and
      in-person channels.
  - name: Catalog Management
    description: Manage a unified product catalog with items, variations, modifiers, categories, taxes, and discounts synchronized
      across all locations.
  - name: Customer Engagement
    description: Build customer profiles, loyalty programs, gift cards, and marketing campaigns to drive repeat business and
      customer retention.
  - name: Multi-Location Support
    description: Manage multiple business locations with location-specific inventory, pricing, staff permissions, and reporting.
  - name: Webhook Events
    description: Subscribe to real-time webhook events for payments, orders, inventory changes, customer activity, and subscription
      lifecycle events.
  - name: Sandbox Environment
    description: Full sandbox environment with test card numbers, merchant accounts, and simulated hardware for development
      and testing.
- type: UseCases
  data:
  - name: Point of Sale Integration
    description: Retailers and restaurants build custom POS applications using Square's payment, catalog, and order APIs.
  - name: eCommerce Checkout
    description: Online stores integrate Square's Web Payments SDK and Orders API to accept payments and manage fulfillment.
  - name: Marketplace Payments
    description: Multi-seller marketplaces use Square Connect to route payments to sellers and manage fees through the Payouts
      API.
  - name: Subscription Billing
    description: SaaS and service businesses use Square Subscriptions API for automated recurring billing and invoice management.
  - name: Loyalty and Rewards
    description: Businesses implement custom loyalty programs using the Loyalty API to track points, tiers, and reward redemptions.
- type: Integrations
  data:
  - name: WooCommerce
    description: Official Square extension for WooCommerce synchronizes inventory, products, and payments between WordPress
      stores and Square.
  - name: BigCommerce
    description: Square integration for BigCommerce enables omnichannel selling with synchronized catalog and unified payment
      processing.
  - name: Xero
    description: Square-Xero integration automatically syncs sales transactions and payments to Xero accounting for reconciliation.
  - name: QuickBooks
    description: Square connector for QuickBooks Online syncs sales, refunds, and fees to QuickBooks for financial reporting.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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