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 Indexes API is one of 6 APIs that 4chan publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include Indexes. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and a support channel.
This API exposes 1 operation across 1 path, and defines 3 schemas. It is described by OpenAPI 3.0.3, at version 2026-05-28.
Requests are made against 2 base URLs: https://a.4cdn.org, http://a.4cdn.org.
Metadata
The identity and technical contract details declared by the specification.
Paths & Operations 1
Across 1 path, the API surfaces 1 operation — 1 GET. Each is listed below with its method, path, parameters, and response codes.
Per-board, per-page index document of threads (each with a posts array including the OP and a small number of preview replies).
Schemas 3
The contract defines 3 schemas that model the data the API accepts and returns. The most detailed are Post (43 properties), IndexPageThread (1 property), IndexPageResponse (1 property). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
More from 4chan 5
Other APIs 4chan publishes across the network.