---
title: Reference
description: Exact schemas, interfaces, services, environments, and implementation sources for the Hypercerts Protocol.
---

# Reference

The Reference contains exact, source-backed details to look up while you build. Use the [Guide](/guide) when you need the meaning of a concept or the conventions around it.

{% card-grid %}
{% card-link title="Lexicons" href="/lexicons/introduction-to-lexicons" %}
Schemas, examples, and usage conventions for every Hypercerts and Certified record.
{% /card-link %}
{% card-link title="XRPC API" href="/reference/xrpc-api" %}
Queries and procedures of the released Hypercerts API.
{% /card-link %}
{% card-link title="SDK" href="/reference/sdk" %}
Exports, types, and versions of the Hypercerts SDK. Under development.
{% /card-link %}
{% card-link title="Services and tooling" href="/reference/services" %}
The services in the Hypercerts stack and where they run.
{% /card-link %}
{% /card-grid %}