Kartra

Kartra API

Kartra's inbound developer API. One endpoint, POST only, form-encoded, with the operation selected by `actions[].cmd`. Twenty-nine documented commands cover leads, tags, lists, automation sequences, custom fields, lead scoring, pages, calendar bookings, payment transactions and recurring subscriptions. Every call carries three credentials in the body — the developer's `app_id` plus the end user's `api_key` and `api_password` — and acts on exactly one lead. Rate limited to 20 calls per second per App.

GitHub

Documentation

📖
Documentation
https://support.kartra.com/en/collections/19655232-developers
📖
APIReference
https://support.kartra.com/en/articles/15369013-connecting-to-the-api
📖
GettingStarted
https://support.kartra.com/en/articles/15369011-activating-your-app
📖
Authentication
https://raw.githubusercontent.com/api-evangelist/kartra/refs/heads/main/authentication/kartra-authentication.yml
📖
RateLimits
https://raw.githubusercontent.com/api-evangelist/kartra/refs/heads/main/rate-limits/kartra-rate-limits.yml

Other Resources

🔗
Conventions
https://raw.githubusercontent.com/api-evangelist/kartra/refs/heads/main/conventions/kartra-conventions.yml
🔗
ErrorCatalog
https://raw.githubusercontent.com/api-evangelist/kartra/refs/heads/main/errors/kartra-error-codes.yml
🔗
Sandbox
https://raw.githubusercontent.com/api-evangelist/kartra/refs/heads/main/sandbox/kartra-sandbox.yml
🔗
DataModel
https://raw.githubusercontent.com/api-evangelist/kartra/refs/heads/main/data-model/kartra-data-model.yml
🔗
Webhooks
https://raw.githubusercontent.com/api-evangelist/kartra/refs/heads/main/asyncapi/kartra-webhooks.yml
🔗
X-MCPServerCandidate
https://raw.githubusercontent.com/api-evangelist/kartra/refs/heads/main/mcp/kartra-mcp.yml
🔗
AgentSkill
https://raw.githubusercontent.com/api-evangelist/kartra/refs/heads/main/skills/_index.yml
🔗
APIsJSON
https://raw.githubusercontent.com/api-evangelist/kartra/refs/heads/main/apis.yml

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API entry from apis.yml

apis.yml Raw ↑ 
aid: kartra:kartra-api
name: Kartra API
description: Kartra's inbound developer API. One endpoint, POST only, form-encoded, with the operation
  selected by `actions[].cmd`. Twenty-nine documented commands cover leads, tags, lists, automation sequences,
  custom fields, lead scoring, pages, calendar bookings, payment transactions and recurring subscriptions.
  Every call carries three credentials in the body — the developer's `app_id` plus the end user's `api_key`
  and `api_password` — and acts on exactly one lead. Rate limited to 20 calls per second per App.
humanURL: https://support.kartra.com/en/collections/19655232-developers
baseURL: https://app.kartra.com/api
tags:
- Marketing Automation
- Contacts
- Email Marketing
- Payments
- Subscription
tags_raw:
- Marketing Automation
- Contacts
- Email Marketing
- Payments
- Subscriptions
properties:
- type: Documentation
  url: https://support.kartra.com/en/collections/19655232-developers
- type: APIReference
  url: https://support.kartra.com/en/articles/15369013-connecting-to-the-api
- type: GettingStarted
  url: https://support.kartra.com/en/articles/15369011-activating-your-app
- type: Authentication
  url: authentication/kartra-authentication.yml
- type: Conventions
  url: conventions/kartra-conventions.yml
- type: ErrorCatalog
  url: errors/kartra-error-codes.yml
- type: RateLimits
  url: rate-limits/kartra-rate-limits.yml
- type: Sandbox
  url: sandbox/kartra-sandbox.yml
- type: DataModel
  url: data-model/kartra-data-model.yml
- type: Webhooks
  url: asyncapi/kartra-webhooks.yml
- type: X-MCPServerCandidate
  url: mcp/kartra-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate
    — a tool list derived from the published API contracts, not an existing server. The scorer already
    read the manifest and reported mcp_server correctly; the MCPServer type was crediting the artifact-type
    surfaces with a server that does not exist.'
- type: AgentSkill
  url: skills/_index.yml