---
title: "APIs and data feeds | CCCURJ Help"
description: "CCCURJ metadata is open (CC BY 4.0) and needs no account or key. All endpoints are read-only. Machine-readable descriptions: https://cccurj.org/openapi.json…"
url: "https://cccurj.org/help/api"
license: "CC BY 4.0"
---

[Help](https://cccurj.org/help/) > APIs and data feeds

# APIs and data feeds

CCCURJ metadata is open (CC BY 4.0) and needs no account or key. All endpoints are read-only. Machine-readable descriptions: <https://cccurj.org/openapi.json> (OpenAPI 3.1) and the [API catalog](https://cccurj.org/.well-known/api-catalog) ([RFC 9727](https://www.rfc-editor.org/rfc/rfc9727)).

## OAI-PMH

**https://cccurj.org/account/oai** is an [OAI-PMH 2.0](https://www.openarchives.org/OAI/openarchivesprotocol.html) endpoint with Dublin Core (`oai_dc`) records for every preprint. Start with [?verb=Identify](https://cccurj.org/account/oai?verb=Identify) or [?verb=ListRecords&metadataPrefix=oai_dc](https://cccurj.org/account/oai?verb=ListRecords&metadataPrefix=oai_dc).

## Agent-to-agent (A2A)

AI agents can search preprints and look papers up by id over the [A2A protocol](https://a2a-protocol.org/latest/specification/) (version 1.0, JSON-RPC binding). The [Agent Card](https://cccurj.org/.well-known/agent-card.json) describes the skills; send `SendMessage` requests to **https://cccurj.org/account/a2a** with a text part such as `machine learning` or `2610.00003`. Replies are a message with a Markdown text part and a JSON data part; there are no tasks or streaming.

## JSON

- <https://cccurj.org/account/stats.json>: CCCURJ Flagship review statistics (counts and medians, sample papers excluded), shown on [the stats page](https://cccurj.org/flagship/stats).
- <https://cccurj.org/account/leaderboard.json>: the [leaderboard](https://cccurj.org/leaderboard) of editors and reviewers.
- <https://cccurj.org/account/health>: returns `{"status": "ok"}` when the service is up.

## Feeds and files

RSS feeds per archive and category are described in [Listings and RSS feeds](https://cccurj.org/help/rss). PDFs are at **https://cccurj.org/pdf/\<id>**; see [versions and formats](https://cccurj.org/help/view). A [sitemap](https://cccurj.org/sitemap.xml) and [llms.txt](https://cccurj.org/llms.txt) summary are also available; agents can read [auth.md](https://cccurj.org/auth.md) (no registration or credentials needed).

Please keep automated requests to about one per second. Questions: [hello@cccurj.org](mailto:hello@cccurj.org).