# 8x API and AI-agent resources

> What 8x publishes for software and AI agents: an OpenAPI description of its public endpoints, every page as Markdown, discovery catalogs and an agent skill.

None of these endpoints needs credentials. 8x issues no API keys and offers no public MCP server or webhook feed, and every other path under /api is internal to the 8x app.

## API

- [OpenAPI description](https://8x.sale/openapi.json): Every public 8x endpoint in OpenAPI 3.1: the Markdown pages, the llms files, the discovery documents and the health check.
- [Health check](https://8x.sale/api/health): Whether the site and its database are up.
- [8x API and AI-agent resources, as Markdown](https://8x.sale/developers.md): when to use 8x, the API and content negotiation, in one page.

## Discovery

- [API catalog (RFC 9727)](https://8x.sale/.well-known/api-catalog): Links to the OpenAPI description, this page and the health check.
- [Agentic resource catalog (ARD)](https://8x.sale/.well-known/ard.json): The OpenAPI description, the agent skill and llms.txt, as one catalog.
- [AI Catalog](https://8x.sale/.well-known/ai-catalog.json): The same catalog at the AI Catalog standard's address.
- [Agent Skills index](https://8x.sale/.well-known/agent-skills/index.json): The 8x agent skill: when to use 8x, where to send each person, and how to read the site.
- [The 8x agent skill](https://8x.sale/.well-known/agent-skills/8x/SKILL.md): The skill itself, a SKILL.md.

## Optional

- [llms.txt](https://8x.sale/llms.txt): What 8x is, when to use it, and a link to every public page, in the llmstxt.org format.
- [llms-full.txt](https://8x.sale/llms-full.txt): Every public page, concatenated as Markdown.
- [XML sitemap](https://8x.sale/sitemap.xml): Every indexable URL, with the day each last changed.
- [Crawler policy](https://8x.sale/robots.txt): The AI crawlers 8x allows by name, and the signed-in app it keeps out.