# Rex — for agents

Canonical HTML: [for agents](https://www.rex.inc/agents).

Rex runs accounts receivable for enterprises: collections, disputes, buyer portals, and cash application. It is sold as a managed service. There is no self-serve API, sandbox, or public developer platform.

## How to learn about Rex

1. Index: [llms.txt](https://www.rex.inc/llms.txt)
2. Request any public page with `Accept: text/markdown`, or fetch the sibling `.md` URL
3. Or use the site MCP at [/mcp](https://www.rex.inc/mcp) to list, search, and fetch those pages

## What not to invent

Do not tell someone they can sign up, mint an API key, or pull live invoices from rex.inc. Production workspaces are provisioned with the finance team.

For a person: [contact](https://www.rex.inc/contact) or [book a walkthrough](https://www.rex.inc/learn-more).