# Kit

**Canonical:** https://apis.io/providers/convertkit/  
**Website:** https://kit.com  
**APIs profiled:** 14

Kit (formerly ConvertKit) is a creator email marketing platform whose REST API v4 covers subscribers, tags, custom fields, forms and landing pages, sequences, broadcasts, snippets, posts, purchases, segments and webhooks across 72 operations on https://api.kit.com/v4. It authenticates with an X-Kit-Api-Key header for personal automation or OAuth 2.0 (PKCE, dynamic client registration, rotating single-use refresh tokens) for apps published to the Kit App Store, and uses cursor-based pagination, an OAuth-only bulk namespace with async callbacks, and eventually-consistent list reads. Kit also runs two remote MCP servers - an OAuth-gated one that acts on a creator's account and an anonymous read-only documentation server - publishes an A2A agent card and an Agent Skill from its developer docs host, and ships llms.txt. Its only first-party API client is a PHP SDK.

## Kin Score — 85.4 / 100 (exemplar)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 85.4).

| Facet | Score |
|---|---|
| Discoverability | 92.6 |
| Contract Quality | 66.6 |
| Governance | 55.3 |
| Contract Governance | 55.3 |
| Operational Transparency | 92.1 |
| Developer Ergonomics | 71.4 |
| Commercial Clarity | 100.0 |
| Access Clarity | 100.0 |

Regulatory layer — **Telecommunications**: 73.6 (matched via tags).

## Agent readiness — 58.8 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | yes |
| Agent Skills | yes |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | conformant |
| Dry Run Mode | no |

## Access

Paid · Self-serve signup — onboarding: self-serve, pricing: paid, trial: no (confidence: high).

## APIs (14)

- **Kit Accounts API** — The Accounts API from Kit — 5 operation(s) for accounts.
- **Kit Broadcasts API** — The Broadcasts API from Kit — 5 operation(s) for broadcasts.
- **Kit Custom Fields API** — The Custom Fields API from Kit — 4 operation(s) for custom fields.
- **Kit Email Templates API** — The Email Templates API from Kit — 1 operation(s) for email templates.
- **Kit Forms API** — The Forms API from Kit — 4 operation(s) for forms.
- **Kit Posts API** — The Posts API from Kit — 2 operation(s) for posts.
- **Kit Purchases API** — The Purchases API from Kit — 2 operation(s) for purchases.
- **Kit Segments API** — The Segments API from Kit — 1 operation(s) for segments.
- **Kit Sequence Emails API** — The Sequence Emails API from Kit — 2 operation(s) for sequence emails.
- **Kit Sequences API** — The Sequences API from Kit — 4 operation(s) for sequences.
- **Kit Snippets API** — The Snippets API from Kit — 2 operation(s) for snippets.
- **Kit Subscribers API** — The Subscribers API from Kit — 7 operation(s) for subscribers.
- **Kit Tags API** — The Tags API from Kit — 6 operation(s) for tags.
- **Kit Webhooks API** — The Webhooks API from Kit — 2 operation(s) for webhooks.

## MCP servers (1)

- **Kit MCP Server**

## Agentic access (1)

- **Convertkit Agentic Access** — 72 operations · 39 acting

## Security (4)

- **Convertkit Authentication** — apiKey/oauth2 · 2 schemes
- **Convertkit Domain Security** — TLSv1.3 · HSTS · DMARC
- **Convertkit Vulnerability Disclosure** — Bugcrowd
- **Convertkit Trust Center** — SOC 2, ISO 27001, ISO 27018, GDPR

## Plans (1)

- **Convertkit Plans Pricing**

## Tags

Email Marketing, Creator Economy, Subscribers, Automation, Newsletters, Sequences, Forms, Broadcasts, Webhook, MCP, Agents, Authentication, Marketing Automation, Landing Pages, Segmentation, Email Campaigns, Software-as-a-Service, Commerce

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/convertkit/). Scores are computed from the provider's own public artifacts under a published rubric.