> For the complete documentation index, see [llms.txt](https://docs.northstar.sonicsvm.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.northstar.sonicsvm.org/build.md).

# Build

This section covers what you need to ship a NorthStar integration. The [Concepts](/concepts.md) section explains the formal model; this is the production-side counterpart.

## In this section

* [Integration Guide](/build/migrate.md) — adopt NorthStar in an existing Solana program. Covers the program-side `delegate_to_portal` hook, client wiring, runtime steps, the Mach AMM worked example, common gotchas, and a testing checklist.
* [Programmable Economics](/build/fees.md) — the full `FeeStructure` surface area. Custom fee tokens, per-instruction schedules, operator revenue capture.

## When to use what

* If you're standing up a new project, start with [Hello World](/getting-started/hello-world.md), then come here for production-grade fees + delegation patterns.
* If you have an existing Solana program, the [Integration Guide](/build/migrate.md) is the entry point.
* If you're building an aggregator or wallet that opens grids on behalf of users, [Programmable Economics](/build/fees.md) covers the revenue-capture model.


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