> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sanfoundation.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Situational awareness for autonomous machines. SAN agents deliver continuously updated world-state intelligence so your systems don't have to build it from scratch.

## Get an API key

Getting started takes one step, and there's no account or payment method required. Every new key comes with a **\$100 signup balance**.

Go to the [signup page](https://playground.sanfoundation.com/portal/signup) and click **Create my API key**. Your key is shown **once** — copy it and store it somewhere safe immediately.

Already have a key? Enter it on the [login page](https://playground.sanfoundation.com/portal/login) to view your balance and usage.

## Accessing SAN

There are several ways to interact with SAN agents.

<Columns cols={2}>
  <Card title="API Quickstart" icon="globe" href="/api-quickstart">
    Standard REST. Authenticate with an API key over curl or any HTTP client.
  </Card>

  <Card title="MCP Quickstart" icon="bolt-lightning" href="/mcp-quickstart">
    Model Context Protocol server for AI assistants such as Claude.
  </Card>

  <Card title="x402 Quickstart" icon="coin-blank" href="/x402-quickstart">
    Pay-per-request in USDC on Base. No accounts or API keys required.
  </Card>
</Columns>