Build on Squarespace
Everything you need to build and publish external apps — reliable APIs, clear documentation, and a marketplace to reach Squarespace's global customer base.
What you can build
Integration, customization, or extension. Our docs can get you started, and the rest is up to you.
- 01
App creation
Use our APIs to connect your business to Squarespace and reach more customers.
- 02
Advanced commerce management
Manage your storefront's orders, inventory, transactions, and more.
- 03
Website & domain reselling
Add Squarespace websites and domains to your business offering.
- 04
Custom themes & code
Inject CSS, JavaScript, and full code blocks against the 7.1 layout model.
- 05
Webhooks & automation
Subscribe to order, inventory, content, and customer events with signed delivery.
- 06
AI compatibility
Integrate our API docs directly into Claude or ChatGPT.
What's included
Get deep control with Commerce APIs, Reseller APIs, and a reliable custom code spec.
Commerce APIs
Read and write orders, products, inventory, and transactions. REST endpoints, webhooks for order events, and signed payloads for safe server-to-server delivery.
Custom Code Spec
A documented contract for injecting code into 7.1 sites — code blocks, code injection points, and the Fluid Engine layout model. No version drift.
Reseller APIs
Provision, configure and bill for Squarespace sites and domains on behalf of clients. Built for companies looking to integrate our products into their offering.
Stay in the loop
Get notified about API updates, breaking changes, and new developer tools.
Ready to build?
Get started.
