Square Developer

Focus on your code. We’ll handle payments.

New: Square Reader SDK

Use Square hardware to take payments in your own app.

Square Reader SDK

Secure and PCI-compliant APIs and SDKs for your payments needs.

Omnichannel, multichannel—call it what you want. Take payments wherever your customers are.

Take in-person payments.

Use Square hardware to take in-person, card-present payments. Build a custom point of sale, self-service kiosk, or any other in-person payment solution.
Square Reader SDK >

Take online payments.

Take payments on a website or on mobile web with a customized payment form, or quickly embed a checkout experience into a website.
Online Payment APIs >

Integrate with existing systems.

Transfer payments data into a CRM, OMS, ERP, or any enterprise business solution.
View Square’s APIs >


Rely on the payment platform that has processed billions of transactions.

PCI and EMV compliance

Our hardware and software are compliant with PCI Data Security Standard (PCI-DSS) and EMV regulations. We take on the burden of staying compliant, which means you don’t have to worry about assessment fees or potential expensive data breach fines.

End-to-end encryption

From the time the customer taps, dips, or swipes a credit card, the data is encrypted until it reaches Square’s processing environment. Customer data never touches the seller’s servers. And it’s all preconfigured, with no additional steps necessary.

Every payment type

Process all major credit and debit cards and accept mobile-wallet NFC payments out of the box. This includes Apple Pay, Google Pay, and Samsung Pay.

Dispute management

We have a dedicated disputes team to deal with the bank for you. We’ll ask for the documentation we need and take care of the rest with no additional fees.

Fast deposits

Get your money faster with Square’s deposits as soon as the next business day. We also offer instant or scheduled same-day deposits for an additional small fee.

Fraud detection

We use machine learning to analyze every payment in our ecosystem. It enables us to prevent fraud on sellers’ behalf, regardless of the payment volume they are processing.


Understand your customers, sales, inventory, and more.

Easily make informed decisions with a complete view of your inventory, customers, and products across all of your online and in-person sales.
Customers API >
Catalog API >
Inventory API >


Create unlimited solutions including:

  • Custom points of sale
  • Online checkout experiences
  • Line-busting mobile solutions
  • Customer management solutions
“Square offers us a way to think outside the box in terms of what’s possible for transactions and experiences in-Shack. We’re freed from the restrictions put on us by legacy products, and the Square suite of tools enables a variety of new opportunities.”

– Anoop Pillarisetti, Digital Product & Strategy at Shake Shack

Square APIs and SDKs are free for developers to use.

Square charges a processing fee on credit and debit transactions.

In-Person Transactions

2.5% + 10¢
Per dip, tap, or swipe with Reader SDK*

Online Transactions

2.9% + 30¢
Per transaction

Custom Rate

Custom pricing packages may be available for large businesses depending on payment volume, average transaction size, and more. We’d love to have a conversation about it.

Contact Sales >

* Full Pricing Information >

Open-source platforms supporting Square.


Ready to get started?