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 43 API contracts indexed on the APIs.io network, including Catalog API, Customers API, Merchants API, and 40 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 34 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

54.3/100 strong ▬ flat Agent 46/100 agent ready Front door AI 4/6 moderate saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 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 2026-11-06 · rubric v0.27.0

Composite quality — 54.3/100 · strong

Contract Quality 11.1 / 19

Developer Ergonomics 8.4 / 15

Access Clarity 3.8 / 15

Operational Transparency 4.9 / 10

Contract Governance 2.5 / 9

Discoverability 4.7 / 8

Regulatory Posture 4.7 / 15

Create-or-Update Ergonomics 6.1 / 10

Agent readiness — 46/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Agent Skills +5 pts — skills artifact present, graded by who authored it
Protected Resource Metadata +5 pts — a served /.well-known/oauth-protected-resource carrying `resource` (documented), and naming its authorization_servers (verified)
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service, OR (0.27) a live x402 payment challenge from _data/x402-adoption.json — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's

3 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 25.0 — up to +15.0 composite points
Contract Quality scores 59.1 — up to +10.2 composite points
Developer Ergonomics scores 56.0 — up to +8.8 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/block/apis.yml: open an issue on github.com/api-evangelist/block to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
x402 Micropayments & Agentic Pay-per-Call	standard	54.0	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 3

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

APIs 43

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

Block Booking Custom Attributes API

The BookingCustomAttributes API from Block — 6 operation(s) for bookingcustomattributes.

Block Bookings API

The Bookings API from Block — 11 operation(s) for bookings.

Block Cards API

The Cards API from Block — 3 operation(s) for cards.

Block Channels API

The Channels API from Block — 3 operation(s) for channels.

Block Checkout API

The Checkout API from Block — 5 operation(s) for checkout.

Block Customer Custom Attributes API

The CustomerCustomAttributes API from Block — 5 operation(s) for customercustomattributes.

Block Devices API

The Devices API from Block — 4 operation(s) for devices.

Block Disputes API

The Disputes API from Block — 8 operation(s) for disputes.

Block Employees API

The Employees API from Block — 2 operation(s) for employees.

Block Events API

The Events API from Block — 4 operation(s) for events.

Block Gift Card Activities API

The GiftCardActivities API from Block — 1 operation(s) for giftcardactivities.

Block Inventory API

The Inventory API from Block — 19 operation(s) for inventory.

Block Invoices API

The Invoices API from Block — 7 operation(s) for invoices.

Block Labor API

The Labor API from Block — 19 operation(s) for labor.

Block Location Custom Attributes API

The LocationCustomAttributes API from Block — 6 operation(s) for locationcustomattributes.

Block Locations API

The Locations API from Block — 2 operation(s) for locations.

Block Loyalty API

The Loyalty API from Block — 16 operation(s) for loyalty.

Block Merchant Custom Attributes API

The MerchantCustomAttributes API from Block — 6 operation(s) for merchantcustomattributes.

Block OAuth API

The OAuth API from Block — 3 operation(s) for oauth.

Block Order Custom Attributes API

The OrderCustomAttributes API from Block — 6 operation(s) for ordercustomattributes.

Block Payouts API

The Payouts API from Block — 3 operation(s) for payouts.

Block Refunds API

The Refunds API from Block — 2 operation(s) for refunds.

Block Sites API

The Sites API from Block — 1 operation(s) for sites.

Block Snippets API

The Snippets API from Block — 1 operation(s) for snippets.

Block Subscriptions API

The Subscriptions API from Block — 11 operation(s) for subscriptions.

Block Team API

The Team API from Block — 8 operation(s) for team.

Block Terminal API

The Terminal API from Block — 15 operation(s) for terminal.

Block Transactions API

The Transactions API from Block — 2 operation(s) for transactions.

Block Transfer Order API

The TransferOrder API from Block — 6 operation(s) for transferorder.

Block V1Transactions API

The V1Transactions API from Block — 2 operation(s) for v1transactions.

Block Vendors API

The Vendors API from Block — 6 operation(s) for vendors.

Block Apple Pay API

The Apple Pay API from Block — 1 operation(s) for apple pay.

Block Bank Accounts API

The Bank Accounts API from Block — 4 operation(s) for bank accounts.

Block Cash Drawers API

The Cash Drawers API from Block — 3 operation(s) for cash drawers.

Block Customer Groups API

The Customer Groups API from Block — 2 operation(s) for customer groups.

Block Customer Segments API

The Customer Segments API from Block — 2 operation(s) for customer segments.

Block Gift Cards API

The Gift Cards API from Block — 6 operation(s) for gift cards.

Block Webhook Subscriptions API

The Webhook Subscriptions API from Block — 5 operation(s) for webhook subscriptions.

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Postman Collections 1

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

Square API

POSTMAN

Open Collections 5

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

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

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MCP Servers 1

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

Block MCP Server

MCP SERVER

Block API pricing

Not yet checked against Block's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Block's documentation. All 5 limits →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Block

SLA

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.

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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 — jsonschema 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

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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 4

Status, limits, changes, and where to get help

RateLimits

ChangeLog

StatusPage

Support

Commercial 5

Pricing, plans, and the legal terms of use

Plans

FinOps

Pricing

TermsOfService

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
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  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
- aid: block:block-bookingcustomattributes-api
  name: Block Booking Custom Attributes API
  description: The BookingCustomAttributes API from Block — 6 operation(s) for bookingcustomattributes.
  humanURL: https://developer.squareup.com/
  tags:
  - BookingCustomAttributes
  properties:
  - type: OpenAPI
    url: openapi/block-bookingcustomattributes-api-openapi.yml
- aid: block:block-bookings-api
  name: Block Bookings API
  description: The Bookings API from Block — 11 operation(s) for bookings.
  humanURL: https://developer.squareup.com/
  tags:
  - Booking
  tags_raw:
  - Bookings
  properties:
  - type: OpenAPI
    url: openapi/block-bookings-api-openapi.yml
- aid: block:block-cards-api
  name: Block Cards API
  description: The Cards API from Block — 3 operation(s) for cards.
  humanURL: https://developer.squareup.com/
  tags:
  - Cards
  properties:
  - type: OpenAPI
    url: openapi/block-cards-api-openapi.yml
- aid: block:block-channels-api
  name: Block Channels API
  description: The Channels API from Block — 3 operation(s) for channels.
  humanURL: https://developer.squareup.com/
  tags:
  - Channels
  properties:
  - type: OpenAPI
    url: openapi/block-channels-api-openapi.yml
- aid: block:block-checkout-api
  name: Block Checkout API
  description: The Checkout API from Block — 5 operation(s) for checkout.
  humanURL: https://developer.squareup.com/
  tags:
  - Checkout
  properties:
  - type: OpenAPI
    url: openapi/block-checkout-api-openapi.yml
- aid: block:block-customercustomattributes-api
  name: Block Customer Custom Attributes API
  description: The CustomerCustomAttributes API from Block — 5 operation(s) for customercustomattributes.
  humanURL: https://developer.squareup.com/
  tags:
  - CustomerCustomAttributes
  properties:
  - type: OpenAPI
    url: openapi/block-customercustomattributes-api-openapi.yml
- aid: block:block-devices-api
  name: Block Devices API
  description: The Devices API from Block — 4 operation(s) for devices.
  humanURL: https://developer.squareup.com/
  tags:
  - Devices
  properties:
  - type: OpenAPI
    url: openapi/block-devices-api-openapi.yml
- aid: block:block-disputes-api
  name: Block Disputes API
  description: The Disputes API from Block — 8 operation(s) for disputes.
  humanURL: https://developer.squareup.com/
  tags:
  - Disputes
  properties:
  - type: OpenAPI
    url: openapi/block-disputes-api-openapi.yml
- aid: block:block-employees-api
  name: Block Employees API
  description: The Employees API from Block — 2 operation(s) for employees.
  humanURL: https://developer.squareup.com/
  tags:
  - Employees
  properties:
  - type: OpenAPI
    url: openapi/block-employees-api-openapi.yml
- aid: block:block-events-api
  name: Block Events API
  description: The Events API from Block — 4 operation(s) for events.
  humanURL: https://developer.squareup.com/
  tags:
  - Event
  tags_raw:
  - Events
  properties:
  - type: OpenAPI
    url: openapi/block-events-api-openapi.yml
- aid: block:block-giftcardactivities-api
  name: Block Gift Card Activities API
  description: The GiftCardActivities API from Block — 1 operation(s) for giftcardactivities.
  humanURL: https://developer.squareup.com/
  tags:
  - GiftCardActivities
  properties:
  - type: OpenAPI
    url: openapi/block-giftcardactivities-api-openapi.yml
- aid: block:block-inventory-api
  name: Block Inventory API
  description: The Inventory API from Block — 19 operation(s) for inventory.
  humanURL: https://developer.squareup.com/
  tags:
  - Inventory
  properties:
  - type: OpenAPI
    url: openapi/block-inventory-api-openapi.yml
- aid: block:block-invoices-api
  name: Block Invoices API
  description: The Invoices API from Block — 7 operation(s) for invoices.
  humanURL: https://developer.squareup.com/
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/block-invoices-api-openapi.yml
- aid: block:block-labor-api
  name: Block Labor API
  description: The Labor API from Block — 19 operation(s) for labor.
  humanURL: https://developer.squareup.com/
  tags:
  - Labor
  properties:
  - type: OpenAPI
    url: openapi/block-labor-api-openapi.yml
- aid: block:block-locationcustomattributes-api
  name: Block Location Custom Attributes API
  description: The LocationCustomAttributes API from Block — 6 operation(s) for locationcustomattributes.
  humanURL: https://developer.squareup.com/
  tags:
  - LocationCustomAttributes
  properties:
  - type: OpenAPI
    url: openapi/block-locationcustomattributes-api-openapi.yml
- aid: block:block-locations-api
  name: Block Locations API
  description: The Locations API from Block — 2 operation(s) for locations.
  humanURL: https://developer.squareup.com/
  tags:
  - Location
  tags_raw:
  - Locations
  properties:
  - type: OpenAPI
    url: openapi/block-locations-api-openapi.yml
- aid: block:block-loyalty-api
  name: Block Loyalty API
  description: The Loyalty API from Block — 16 operation(s) for loyalty.
  humanURL: https://developer.squareup.com/
  tags:
  - Loyalty
  properties:
  - type: OpenAPI
    url: openapi/block-loyalty-api-openapi.yml
- aid: block:block-merchantcustomattributes-api
  name: Block Merchant Custom Attributes API
  description: The MerchantCustomAttributes API from Block — 6 operation(s) for merchantcustomattributes.
  humanURL: https://developer.squareup.com/
  tags:
  - MerchantCustomAttributes
  properties:
  - type: OpenAPI
    url: openapi/block-merchantcustomattributes-api-openapi.yml
- aid: block:block-oauth-api
  name: Block OAuth API
  description: The OAuth API from Block — 3 operation(s) for oauth.
  humanURL: https://developer.squareup.com/
  tags:
  - OAuth
  - Authentication
  tags_raw:
  - OAuth
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/block-oauth-api-openapi.yml
- aid: block:block-ordercustomattributes-api
  name: Block Order Custom Attributes API
  description: The OrderCustomAttributes API from Block — 6 operation(s) for ordercustomattributes.
  humanURL: https://developer.squareup.com/
  tags:
  - OrderCustomAttributes
  properties:
  - type: OpenAPI
    url: openapi/block-ordercustomattributes-api-openapi.yml
- aid: block:block-payouts-api
  name: Block Payouts API
  description: The Payouts API from Block — 3 operation(s) for payouts.
  humanURL: https://developer.squareup.com/
  tags:
  - Payouts
  properties:
  - type: OpenAPI
    url: openapi/block-payouts-api-openapi.yml
- aid: block:block-refunds-api
  name: Block Refunds API
  description: The Refunds API from Block — 2 operation(s) for refunds.
  humanURL: https://developer.squareup.com/
  tags:
  - Refunds
  properties:
  - type: OpenAPI
    url: openapi/block-refunds-api-openapi.yml
- aid: block:block-sites-api
  name: Block Sites API
  description: The Sites API from Block — 1 operation(s) for sites.
  humanURL: https://developer.squareup.com/
  tags:
  - Sites
  properties:
  - type: OpenAPI
    url: openapi/block-sites-api-openapi.yml
- aid: block:block-snippets-api
  name: Block Snippets API
  description: The Snippets API from Block — 1 operation(s) for snippets.
  humanURL: https://developer.squareup.com/
  tags:
  - Snippets
  properties:
  - type: OpenAPI
    url: openapi/block-snippets-api-openapi.yml
- aid: block:block-subscriptions-api
  name: Block Subscriptions API
  description: The Subscriptions API from Block — 11 operation(s) for subscriptions.
  humanURL: https://developer.squareup.com/
  tags:
  - Subscription
  tags_raw:
  - Subscriptions
  properties:
  - type: OpenAPI
    url: openapi/block-subscriptions-api-openapi.yml
- aid: block:block-team-api
  name: Block Team API
  description: The Team API from Block — 8 operation(s) for team.
  humanURL: https://developer.squareup.com/
  tags:
  - Team
  properties:
  - type: OpenAPI
    url: openapi/block-team-api-openapi.yml
- aid: block:block-terminal-api
  name: Block Terminal API
  description: The Terminal API from Block — 15 operation(s) for terminal.
  humanURL: https://developer.squareup.com/
  tags:
  - Terminal
  properties:
  - type: OpenAPI
    url: openapi/block-terminal-api-openapi.yml
- aid: block:block-transactions-api
  name: Block Transactions API
  description: The Transactions API from Block — 2 operation(s) for transactions.
  humanURL: https://developer.squareup.com/
  tags:
  - Transaction
  tags_raw:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/block-transactions-api-openapi.yml
- aid: block:block-transferorder-api
  name: Block Transfer Order API
  description: The TransferOrder API from Block — 6 operation(s) for transferorder.
  humanURL: https://developer.squareup.com/
  tags:
  - TransferOrder
  properties:
  - type: OpenAPI
    url: openapi/block-transferorder-api-openapi.yml
- aid: block:block-v1transactions-api
  name: Block V1Transactions API
  description: The V1Transactions API from Block — 2 operation(s) for v1transactions.
  humanURL: https://developer.squareup.com/
  tags:
  - V1Transactions
  properties:
  - type: OpenAPI
    url: openapi/block-v1transactions-api-openapi.yml
- aid: block:block-vendors-api
  name: Block Vendors API
  description: The Vendors API from Block — 6 operation(s) for vendors.
  humanURL: https://developer.squareup.com/
  tags:
  - Vendors
  properties:
  - type: OpenAPI
    url: openapi/block-vendors-api-openapi.yml
- aid: block:block-apple-pay-api
  name: Block Apple Pay API
  description: The Apple Pay API from Block — 1 operation(s) for apple pay.
  humanURL: https://developer.squareup.com/
  tags:
  - Apple Pay
  properties:
  - type: OpenAPI
    url: openapi/block-apple-pay-api-openapi.yml
- aid: block:block-bank-accounts-api
  name: Block Bank Accounts API
  description: The Bank Accounts API from Block — 4 operation(s) for bank accounts.
  humanURL: https://developer.squareup.com/
  tags:
  - Bank Accounts
  properties:
  - type: OpenAPI
    url: openapi/block-bank-accounts-api-openapi.yml
- aid: block:block-cash-drawers-api
  name: Block Cash Drawers API
  description: The Cash Drawers API from Block — 3 operation(s) for cash drawers.
  humanURL: https://developer.squareup.com/
  tags:
  - Cash Drawers
  properties:
  - type: OpenAPI
    url: openapi/block-cash-drawers-api-openapi.yml
- aid: block:block-customer-groups-api
  name: Block Customer Groups API
  description: The Customer Groups API from Block — 2 operation(s) for customer groups.
  humanURL: https://developer.squareup.com/
  tags:
  - Customer Groups
  properties:
  - type: OpenAPI
    url: openapi/block-customer-groups-api-openapi.yml
- aid: block:block-customer-segments-api
  name: Block Customer Segments API
  description: The Customer Segments API from Block — 2 operation(s) for customer segments.
  humanURL: https://developer.squareup.com/
  tags:
  - Customer > Segments
  tags_raw:
  - Customer Segments
  properties:
  - type: OpenAPI
    url: openapi/block-customer-segments-api-openapi.yml
- aid: block:block-gift-cards-api
  name: Block Gift Cards API
  description: The Gift Cards API from Block — 6 operation(s) for gift cards.
  humanURL: https://developer.squareup.com/
  tags:
  - Gift Cards
  properties:
  - type: OpenAPI
    url: openapi/block-gift-cards-api-openapi.yml
- aid: block:block-webhook-subscriptions-api
  name: Block Webhook Subscriptions API
  description: The Webhook Subscriptions API from Block — 5 operation(s) for webhook subscriptions.
  humanURL: https://developer.squareup.com/
  tags:
  - Webhook Subscriptions
  properties:
  - type: OpenAPI
    url: openapi/block-webhook-subscriptions-api-openapi.yml
common:
- type: Plans
  url: plans/block-plans-pricing.yml
- type: RateLimits
  url: rate-limits/block-rate-limits.yml
- type: FinOps
  url: finops/block-finops.yml
- 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

Block API — frequently asked questions

Does Block have an API?

Yes. APIs.io lists 43 APIs from Block, including Block Catalog API, Block Customers API and Block Merchants API, and 40 more.

Is there an OpenAPI specification for the Block API?

Yes. APIs.io indexes 43 OpenAPI specifications for Block, each linked for download from this page.

How do I authenticate with the Block API?

Block documents its authentication (http/oauth2 · 2 schemes). The details are profiled on APIs.io as Block Authentication.

How much does the Block API cost?

APIs.io lists 3 pricing plans for Block, with each plan's price, limits and inclusions under Pricing on this page.

Does Block have an MCP server?

Yes. APIs.io lists 1 MCP server for Block.

Is the Block API ready for AI agents?

Block has a Kin Score of 54.3 out of 100 (strong) and an Agent Readiness score of 46.3 (agent-ready), scored by API Evangelist on 2026-11-06.

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