# Introduction

Welcome to the Xpansiv Managed Solutions (XMS) API.

Use this API to register and manage facilities, track transactions and production history, submit meter readings, and access supporting reference data such as clean transportation assets, market pricing, qualified reporting entities, building types, remote data collectors, and utilities.

All requests are authenticated with an HTTP Bearer API key, generated per user.

Continue to [Getting Started](/developer-portal/xpansiv-managed-solutions/getting-started) to begin, or see the [FAQ](/developer-portal/xpansiv-managed-solutions/faq) for common questions.