Customer.io API

customer.io

REST API for sending automated cross-channel messages and managing customer data (Track API, App API, and Beta API) within Customer.io.

The Customer.io API API has paid pricing; offers a free tier (14-day free trial, no credit card required). Verified 2026-07-16 with per-field source links.

Marketing Verified 2026-07-16 low confidence

Base URL

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no source

Auth

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Free tier

14-day free trial, no credit card required

customer.io ↗

Pricing model

paid

customer.io ↗

Pricing

Essentials starts at $100/mo (5k profiles, 1M emails/mo); Premium starts at $1,000/mo; Enterprise custom. Unlimited monthly API calls on all plans. Additional emails $0.12/1,000; additional AI credits $10/100K.

customer.io ↗

Rate limits

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no source

OpenAPI spec

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MCP server

MCP Server connects AI tools like Claude Code and Cursor to a Customer.io workspace; docs at docs.customer.io/ai/mcp-server/

customer.io ↗