---
title: Hydda One API
description: Build integrations with Hydda One. Authenticate an Application, then sell bookable resources, connect an ERP or connect a signing service.
---

Hydda One has a public HTTP API for integrations. An organization's own Application uses it to sell resources on its website. An installed connector uses it to send invoices to an ERP or contracts out for signature.

**[Guides](/guides)**

Get a token, learn which roles open which routes, and follow each integration flow.

**[API reference](/reference)**

Every route, with its parameters, bodies and errors. Send requests from the page.