# READ LESS.  BUILD MORE.

Everything you need to integrate P402: tutorials to get started, guides for specific tasks, reference for lookup, and explanations of how it all works.

## Tutorials

Learn by doing.

- [→Quickstart (5 min)](/content/docs/quickstart/index.html)
- [→Build a Budget Agent](/content/docs/guides/budget-agent/index.html)

## How-To Guides

Solve a specific problem.

- [→Connect an Agent](/content/docs/guides/agents/index.html)
- [→Set Up MCP Server](/content/docs/guides/mcp-server/index.html)
- [→Manage Sessions](/content/docs/guides/sessions/index.html)
- [→Fund with USDC](/content/docs/guides/fund-usdc/index.html)
- [→Choose Routing Modes](/content/docs/guides/routing-modes/index.html)
- [→Configure Caching](/content/docs/guides/caching/index.html)
- [→Manage API Keys](/content/docs/guides/api-keys/index.html)

## Reference

Look up facts.

- [→API Reference](/content/docs/api/index.html)
- [→SDK Reference](/content/docs/sdk/index.html)
- [→CLI Reference](/content/docs/reference/cli/index.html)
- [→MCP Tools](/content/docs/mcp/index.html)
- [→Model Catalog](/content/models/index.html)
- [→Billing Guard](/content/docs/reference/billing-guard/index.html)
- [→Error Codes](/content/docs/reference/error-codes/index.html)

## Understanding P402

Learn why it works.

- [→Architecture](/content/docs/explanation/architecture/index.html)
- [→x402 Protocol](/content/docs/facilitator/index.html)
- [→Routing Engine](/content/docs/router/index.html)
- [→Security Model](/content/docs/explanation/security/index.html)