# 4chan

**Canonical:** https://apis.io/providers/4chan/  
**Website:** https://www.4chan.org  
**APIs profiled:** 6

4chan is a simple image-based bulletin board where anyone can post comments and share images across topic-specific boards. 4chan exposes a read-only JSON API (launched September 2012) that serves the same board, thread, catalog, and archive data consumed by the public site via static JSON files at a.4cdn.org. The API supports GET/HEAD/OPTIONS only — there is no posting, authentication, or write surface.

## Kin Score — 29.7 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 29.7).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 21.5 |
| Governance | 25.0 |
| Contract Governance | 25.0 |
| Operational Transparency | 34.2 |
| Developer Ergonomics | 26.2 |
| Commercial Clarity | 21.1 |
| Access Clarity | 21.1 |

## Agent readiness — 31.6 (agent-aware)

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

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (6)

- **4chan Archive API** — Per-board list of OP numbers for closed, archived threads.
- **4chan Boards API** — List of all boards on 4chan and 4channel and their per-board settings.
- **4chan Catalog API** — Per-board catalog snapshot containing every OP and its preview replies, grouped by index page.
- **4chan Indexes API** — Per-board, per-page index document of threads (each with a posts array including the OP and a small number of preview replies).
- **4chan Threadlist API** — Per-board summary list of every live thread (id, last-modified, reply count) grouped by index page.
- **4chan Threads API** — Single-thread document containing the OP and every reply.

## Agentic access (1)

- **4Chan Agentic Access** — 6 operations

## Security (2)

- **4Chan Domain Security** — TLSv1.3 · DNSSEC · DMARC
- **4Chan Vulnerability Disclosure** — Hackerone

## Plans (1)

- **4Chan Plans Pricing**

## Tags

Social, Bulletin Board, Imageboard, Read Only, JSON, Public APIs, Community

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/4chan/). Scores are computed from the provider's own public artifacts under a published rubric.