# Swap

## Overview

Swap is Slingshot's AMM module for trustless token trading on Goliath Testnet.

**Access:** <https://slingshot.goliath.net/#/swap>

Swap uses a Uniswap V2-style constant product model:

```
x * y = k
```

A **0.3% fee** is charged on swaps:

* **0.25%** to liquidity providers
* **0.05%** to protocol

## Supported Tokens (Goliath Testnet)

| Token                  | Contract Address                             | Decimals | Status  |
| ---------------------- | -------------------------------------------- | -------- | ------- |
| **WXCN** (Wrapped XCN) | `0x88A07F7BBb61A2945D8Ac541461fc62efb1F4066` | 8        | Live    |
| **ETH**                | `0xEd02AA7dd3f105EDab8702D859781CAfF111324b` | 18       | Live    |
| **BTC**                | `0x8b2a7658acD9CA5b4e207F94a0101598c7B678F8` | 8        | Live    |
| **USDC**               | `0x4BE65Dce1D79B8728485B759eE06cC8053E824F4` | 6        | Live    |
| **USDT**               | `0x03cDCCa25A46Bc5F3F484096217de52C8c417c9D` | 6        | Live    |
| **GOLD**               | `0x3B0F44325fb8AaC485Cbe14502d979008341f652` | 18       | Pending |
| **SILVER**             | `0x6090499ccC04bD65BEd0b02D40f607B5348697F7` | 18       | Pending |

{% hint style="info" %}
XCN is the native gas token on Goliath. WXCN is the ERC20-wrapped form used in AMM pools.
{% endhint %}

## User Flow

1. Connect wallet on Goliath Testnet (Chain ID `8901`)
2. Choose input/output token pair
3. Set amount and review price impact/slippage
4. Approve token (first swap per token)
5. Confirm swap transaction

## Developer Notes

Core Swap contracts (Goliath Testnet):

| Contract              | Address                                      |
| --------------------- | -------------------------------------------- |
| **UniswapV2Factory**  | `0x561B0342878bcdeF1a7E7D9BA7654B3C84A81819` |
| **UniswapV2Router02** | `0x1D6B8ad12C72893f89844418DC03999298D9ABF4` |
| **Multicall3**        | `0xF912C1ad454aaaE03A1d72C53702F3dc0B4fcb69` |

Reference integration snippet:

```javascript
const ROUTER_ABI = [
  'function swapExactTokensForTokens(uint amountIn, uint amountOutMin, address[] path, address to, uint deadline) returns (uint[] amounts)',
  'function getAmountsOut(uint amountIn, address[] path) view returns (uint[] amounts)'
];
```

See full contract map in [Slingshot Integration Guide](https://docs.goliath.net/developer-guide/slingshot-integration).