> For the complete documentation index, see [llms.txt](https://entity-6.gitbook.io/fundkeep/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://entity-6.gitbook.io/fundkeep/contract/overview.md).

# Smart Contract Overview

FundKeep's on-chain logic is a single Soroban contract written in Rust using the `soroban-sdk`. One contract deployment handles all users and all goals — individual goals are differentiated by a `goal_id` integer stored in contract instance storage.

## Architecture

```
[Freighter Wallet] <--sign--> [FundKeep Frontend (Next.js + @fundkeep/sdk)]
                                          |
                                          v
                          [FundKeep Soroban Contract (Rust)]
                                          |
                                          v
                            [USDC Token Contract on Soroban]
```

The contract interacts with the USDC token contract to perform transfers. It never holds private keys — it holds USDC on behalf of users, identified by their Stellar address.

This is the contract's own view. The contract is one of four repos — see [System Architecture](https://github.com/fundkeep-web/fundkeep-app/tree/main/docs/introduction/architecture.md) for how the SDK, indexer, and frontend fit around it.

## Network

FundKeep runs against **Soroban Testnet** in v1. The Soroban RPC endpoint is `https://soroban-testnet.stellar.org`. Freighter can be toggled to testnet mode in its settings.