crmzero

Developer Documentation

Integrate your applications with crmzero. Create and update contacts, manage tags, and keep your CRM in sync — via REST API, MCP, or direct app integration.

Documentation

REST API

v1

Create and update contacts, manage tags, and sync your CRM data with any application. Supports smart upsert with per-field merge strategies.

MCP Server

Connect AI agents like Claude, Cursor, and other MCP-compatible tools directly to your CRM. 58 tools for natural-language CRM operations.

Clay Integration

guide

Step-by-step guide to push enriched contacts from Clay into crmzero using the HTTP API action. Includes field mapping, merge strategies, and best practices.

Quick Start

1. Get an API Key

Request a key from your admin via Admin → API Keys

2. Choose an integration

REST API for apps, MCP for AI agents

3. Review data rules

Understand required fields and dedup behavior