Close Developer Platform

Build integrations, automate workflows, and extend Close for your team.
Open in Claude

Whether you’re a Close customer automating your sales process or a partner building an integration, the Close Developer Platform gives everything you or your AI agents need.

REST API Reference

Full endpoint docs with schemas, examples, and an interactive API explorer.

Authentication

API keys for scripts or OAuth 2.0 for user-facing integrations.

Webhooks & Events

Real-time event notifications and a 30-day event log.

MCP Server

Model Context Protocol for AI agents.

Build an Integration

Create an OAuth app, connect your product, and get listed.

API Clients

Community libraries for Python, Node.js, Ruby, PHP, Go, and more.

API Changelog

Latest API updates and deprecations.

Browse 100+ Integrations ↗

Explore the full directory of apps and tools that connect with Close.

Use cases

  • Push in CRM data — Push leads, contacts, activities, and custom data into Close from your website or other systems via the REST API.
  • Sync data out — Stream changes with webhooks, query the event log, or pull reporting metrics and pipeline data into your BI tools, data warehouse, or design custom dashboards & reports.
  • Automate outreach — Manage workflows with sequences or bulk actions, or send email/SMS programmatically.
  • Publish an integration — Build for many Close customers with OAuth and get listed in the integrations directory.
  • Power AI agents — Give Claude, ChatGPT, Cursor, and other tools direct access to Close data via the MCP server — no code required.

Getting help

Our Support Team can assist Close customers with any questions about the API.

Implementing something cool or want to chat about where our API is going? Schedule a call with Joe Kemp, VP of Engineering.