Build a thread browser, a simple board reader, or a monitor that watches threads for updates. You can pull boards, catalogs, thread lists and posts as JSON over HTTPS without signing up. It's easy to use from any language that can make HTTP GET requests. Respect the API rules (one request per second, caching with If-Modified-Since).
API Stats
Health ▼
95
A score out of 100 from our daily tests over the last 30 days, based on error rate, reliability and speed.
Reliability ▼
100%
Share of our daily test calls in the last 30 days that succeeded, averaged over all endpoints of this API.
Error rate ▼
0%
Share of our daily test calls in the last 30 days that failed, averaged over all endpoints of this API.
Pricing ▼
Free
Documentation shows public read-only endpoints with no sign-up or pricing pages.
Auth ▼
No auth
No key or login needed.
🤖 Robot last checked the docs and pricing 17 days ago
Endpoints (3)
https://a.4cdn.org/po/catalog.json
Last 30 Days
Reliability
100 % Reliability
Error Rate
0 % Error Rate
Avg Response Time
247 ms
CORS
Yes
Endpoint Checked
8 hours ago
Endpoint Added
2 years ago
https://a.4cdn.org/3/catalog.json
Last 30 Days
Reliability
100 % Reliability
Error Rate
0 % Error Rate
Avg Response Time
195 ms
CORS
Yes
Endpoint Checked
8 hours ago
Endpoint Added
2 years ago
https://a.4cdn.org/boards.json
Last 30 Days
Reliability
100 % Reliability
Error Rate
0 % Error Rate
Avg Response Time
105 ms
CORS
Yes
Endpoint Checked
21 hours ago
Endpoint Added
2 years ago
Frequently asked questions
No — the API is public and read-only; you can fetch JSON from a.4cdn.org with simple GET requests.
Yes — do not make more than one request per second, update threads no faster than every 10 seconds, and use If-Modified-Since for caching.
No — the API terms forbid using "4chan" in your app title or logo, require attribution, and forbid cloning/hosting their JSON with ads.
Showcase
no showcases
Currently, there are no Showcases using this API.
Comments
no comments
Currently, there are no Comments for this API.
Tags
This API has no tags yet. Select some below, so other users can find it!