Swap HBAR for Tokens
Swap HBAR for HTS fungible tokens.
Below are two methods available to swap HBAR for tokens:
Contract ID: SaucerSwapV2SwapRouter
Consider the token's decimal places when determining the output amount.
The output values should be in the token's smallest unit. For the SAUCE token, which has 6 decimal places, an input of 123.45 SAUCE should be entered as 123450000 (123.45 multiplied by 10^6).
Ensure that the "to" account has the output token id associated prior to executing the swap. Failure to do so will result in a TOKEN_NOT_ASSOCIATED_TO_ACCOUNT error.
When providing HBAR in the path array, use the Wrapped HBAR token id (WHBAR).
Swap Exact HBAR for Tokens
Swap an exact amount of HBAR for a minimum token amount
Solidity function name: exactInput
Struct Parameter Name | Description |
---|---|
bytes path | A bytes array representing a route path including fees data |
recipient | EVM address of the token recipient |
deadline | Deadline in Unix seconds |
amountIn | The exact input token amount in its smallest unit |
amountOutMinimum | The minimum token amount to receive in its smallest unit |
Set the minimum output token amount (amountOutMinimum) with caution.
A high minimum might lead to a swap failure due to insufficient liquidity or rapid price movements. Conversely, setting the minimum too low can expose you to significant slippage, potentially resulting in a financial loss as you might receive far fewer tokens than expected.
It is recommended to include refundETH in the multicall in case excess HBAR was sent to the contract.
The data passed to the 'path' parameter follows this format: [token, fee, token, fee, token, ...], with each 'token' in the route being 20 bytes long and each 'fee' being 3 bytes long. Example, 0x0001F4 (500) for a 0.05% fee.
Code Overview
Resources:
Note: The Hedera Typescript SDK currently does not support passing complex contract function parameters. Instead, use Ethers.js or Web3.js to obtain the encoded function data and pass that data as a function parameter.
Swap HBAR for Exact Tokens
Swap a maximum amount of HBAR to receive an exact tokens amount.
Solidity function name: exactOutput
Struct Parameter Name | Description |
---|---|
bytes path | A bytes array representing a route path including fees data |
recipient | EVM address of the token recipient |
deadline | Deadline in Unix seconds |
amountOut | The exact input token amount in its smallest unit |
amountInMaximum | The minimum token amount to receive in its smallest unit |
Ensure that the refundETH is included in the multicall so that any excess payable HBAR amount, up to the maximum amount, is refunded to the sender.
Set the maximum input token amount (amountInMaximum) with caution.
A low maximum might lead to a swap failure if the required liquidity surpasses this limit or due to rapid price movements. Conversely, setting it too high can expose you to significant slippage, potentially leading to a financial loss as you might spend far more tokens than expected.
The data passed to the 'path' parameter follows this format: [token, fee, token, fee, token, ...], but reversed (i.e. the first token in the array should be output token), with each 'token' in the route being 20 bytes long and each 'fee' being 3 bytes long. Example, 0x000BB8 (3000) for a 0.30% fee.
Code Overview
Last updated