Rex — for 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

Start at llms.txt
Request any public page with Accept: text/markdown, or fetch the sibling .md URL
Or use the site MCP at /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 or book a walkthrough.