# listmonk

**Canonical:** https://apis.io/providers/listmonk/  
**Website:** https://listmonk.app  
**APIs profiled:** 8

listmonk is a free and open-source, self-hosted newsletter and mailing-list manager built in Go with a Vue front end. Every feature in the admin UI is backed by a documented REST API on the self-hosted instance (Basic auth with an API user and token) covering subscribers, lists, campaigns, templates, media, CSV import, transactional messages, and bounces. There is no hosted SaaS - users run their own instance.

## Kin Score — 52.5 / 100 (developing)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (-0.7 from 53.2).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 55.4 |
| Governance | 16.7 |
| Contract Governance | 16.7 |
| Operational Transparency | 68.4 |
| Developer Ergonomics | 70.8 |
| Commercial Clarity | 28.9 |
| Access Clarity | 28.9 |

Regulatory layer — **Telecommunications**: 31.9 (matched via tags).

## Agent readiness — 28.1 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | derived |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

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

## APIs (8)

- **listmonk Bounces API** — The Bounces API from listmonk — 2 operation(s) for bounces.
- **listmonk Campaigns API** — The Campaigns API from listmonk — 8 operation(s) for campaigns.
- **listmonk Import API** — The Import API from listmonk — 2 operation(s) for import.
- **listmonk Lists API** — The Lists API from listmonk — 3 operation(s) for lists.
- **listmonk Media API** — The Media API from listmonk — 2 operation(s) for media.
- **listmonk Subscribers API** — The Subscribers API from listmonk — 10 operation(s) for subscribers.
- **listmonk Templates API** — The Templates API from listmonk — 5 operation(s) for templates.
- **listmonk Transactional API** — The Transactional API from listmonk — 1 operation(s) for transactional.

## Agentic access (1)

- **Listmonk Agentic Access** — 53 operations · 34 acting · 1 human-in-the-loop

## Security (3)

- **Listmonk Authentication** — http/apiKey · 2 schemes
- **Listmonk Domain Security** — TLSv1.3
- **Listmonk Vulnerability Disclosure** — disclosure policy published

## Plans (1)

- **Listmonk Plans Pricing**

## Tags

Email, Newsletter, Mailing List, Marketing, Transactional Email, Campaigns, Subscribers, Bounce Handling, Open-Source, Self-Hosted, Go, PostgreSQL

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