# Billtyme

> Billtyme is agent-first invoicing infrastructure for managing legal sender companies, customers, and invoices through a secure, typed, and durable API.

## Billtyme blog

- [Billtyme blog](https://billtyme.com/blog): Product decisions and architecture notes about building Billtyme from an internal, agent-first invoicing API into a dependable standalone product.
- [Why Billtyme starts with an API](https://billtyme.com/blog/why-billtyme-starts-with-an-api): Why Billtyme keeps durable invoicing commands independent from Slack, web interfaces, and the future agents or MCP clients that invoke them.

## Billtyme documentation

- [Billtyme documentation](https://billtyme.com/docs): Set up sending companies and manage customers and invoice drafts through MCP, with a default sender and shared billing rules behind every operation.
- [Connect with MCP](https://billtyme.com/docs/mcp): Set up sending companies and manage customers and invoice drafts from Codex, using a default sender automatically.
- [Authentication](https://billtyme.com/docs/authentication): Authenticate people, internal services, and future registered agents with WorkOS access tokens while preserving tenant and actor identity.
- [Companies, customers, and invoices](https://billtyme.com/docs/invoices): Create legal sender companies, remember company-scoped customers, and prepare idempotent draft invoices through Billtyme's agent-first API.

## Changelog

- [v0.1.0](https://billtyme.com/changelog/v0-1-0): Billtyme's internal API foundation introduces multi-company accounts, authenticated customer and invoice commands, and generated OpenAPI documentation.

## Reference

- [Billtyme API](https://billtyme.com/reference)

### Companies

- [Create a company](https://billtyme.com/reference/companies/createcompany)
- [Get a company](https://billtyme.com/reference/companies/getcompany)
- [List companies](https://billtyme.com/reference/companies/listcompanies)

### Customers

- [Create a customer](https://billtyme.com/reference/customers/createcustomer)
- [Get a customer](https://billtyme.com/reference/customers/getcustomer)
- [List customers](https://billtyme.com/reference/customers/listcustomers)

### Invoices

- [Create an invoice](https://billtyme.com/reference/invoices/createinvoice)
- [Get an invoice](https://billtyme.com/reference/invoices/getinvoice)
- [List invoices](https://billtyme.com/reference/invoices/listinvoices)

### System

- [Check API health](https://billtyme.com/reference/system/health)

## RSS Feeds

- [Billtyme — Blog](https://billtyme.com/blog/rss.xml)
- [Billtyme — Changelog](https://billtyme.com/changelog/rss.xml)