> For the complete documentation index, see [llms.txt](https://docs.liqd.ag/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.liqd.ag/liquidlaunch-integration/trading.md).

# Trading

Buy and sell tokens on the LiquidLaunch bonding curve. All functions are on the LiquidLaunch contract (`0xDEC3540f5BA6f2aa3764583A9c29501FeB020030`).

## Buying tokens

```solidity
function buyTokens(address token) external payable
```

Send HYPE as `msg.value`. The contract calculates tokens based on the bonding curve, deducts the 1% fee, and transfers tokens to your wallet.

## Selling tokens

```solidity
function sellTokens(address token, uint256 tokenAmount) external
```

Specify how many tokens to sell. You receive HYPE minus the 1% fee. No approval required.

## Estimating trades

Always estimate before trading to understand price impact:

```solidity
function estimateBuy(address token, uint256 hypeAmount) public view returns (uint256)
function estimateSell(address token, uint256 tokenAmount) public view returns (uint256)
```

Both estimates include the 1% fee deduction.

## Checking reserves

```solidity
function getLiquidity(address token) public view returns (uint256 hypeReserve, uint256 tokenReserve)
```

Returns current virtual reserves. Useful for understanding price impact before large trades.

## Full contract reference

All functions, events, data structures, and error codes are documented in the [Contract Reference](/liquidlaunch-integration/api-reference.md).


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