Block (Square) MCP Server

Overview

Block (formerly Square) provides an MCP server enabling AI agents to interact with payment processing, point-of-sale systems, and financial services. As a co-founder of the Agentic AI Foundation (AAIF) under the Linux Foundation alongside Anthropic and OpenAI, Block is committed to advancing AI agent capabilities in financial services.

Features

Payment Processing

• Transaction Management: Process payments, refunds, and voids
• Payment Methods: Credit cards, digital wallets, cash
• Multi-Currency: Support for global payments
• Recurring Billing: Subscription and recurring payment management

Point of Sale

• POS Operations: Sales, refunds, and exchanges
• Inventory Management: Track stock and products
• Employee Management: Staff permissions and shifts
• Customer Profiles: Customer data and purchase history

Business Operations

• Analytics: Sales reports and business insights
• Customer Engagement: Loyalty programs and marketing
• Team Management: Employee scheduling and payroll
• Multi-Location: Manage multiple business locations

Block Ecosystem

Square Platform

• Square POS: Point-of-sale software
• Square Payment Processing: Integrated payments
• Square Online: E-commerce platform
• Square Invoices: Billing and invoicing

Cash App

• Peer-to-Peer Payments: Send and receive money
• Bitcoin: Cryptocurrency trading
• Cash Card: Debit card services
• Investing: Stock and ETF trading

Additional Services

• Square Capital: Business financing
• Square Payroll: Payroll processing
• Square Marketing: Marketing tools
• Square Loyalty: Rewards programs

Use Cases

Retail Automation

• Process sales through conversational AI
• Automated inventory management
• AI-powered customer service
• Smart pricing and promotions

Financial Operations

• Automated reconciliation
• Expense tracking and reporting
• Cash flow forecasting
• Payment analytics

Customer Experience

• Personalized product recommendations
• Automated loyalty rewards
• Intelligent customer support
• Proactive engagement

Business Intelligence

• Sales trend analysis
• Inventory optimization
• Employee performance tracking
• Multi-location insights

Agentic AI Foundation

Co-Founders

• Anthropic: Claude AI platform
• Block: Payment and financial services
• OpenAI: ChatGPT and GPT platform

Governance

• Linux Foundation directed fund
• Open standard development
• Community-driven evolution
• Cross-industry collaboration

API Coverage

Payments API

• Process payments
• Create refunds
• Manage payment methods
• Handle disputes

Orders API

• Create and modify orders
• Calculate pricing
• Apply discounts
• Track fulfillment

Catalog API

• Manage products and services
• Organize categories
• Track variations and modifiers
• Sync inventory

Customers API

• Create customer profiles
• Track purchase history
• Manage loyalty programs
• Send marketing messages

Security & Compliance

Payment Security

• PCI DSS compliant
• End-to-end encryption
• Tokenization
• Fraud detection

Data Protection

• Secure API authentication
• OAuth 2.0 support
• Webhook verification
• Audit logging

Integration

Works with AI assistants supporting MCP. Requires Square developer account and API credentials. Supports both sandbox and production environments.

Pricing

Square payment processing fees vary by service:

• In-Person: 2.6% + $0.10 per transaction
• Online: 2.9% + $0.30 per transaction
• Invoices: 3.3% + $0.30 per transaction

MCP server access included with Square account. No additional fees.