Swap Execution

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Swap Execution

Using the Router
We recommend using the router for swapping stablecoins in Bunicorn. Before executing the swap, it is recommended that an external price source is use to fix the minimum output tokens receivable when selling a fixed amount of tokens, or maximum amount of input tokens to be used when purchasing a fixed amount of tokens.
Your smart contract should also:
1.
Have enough BNB / tokens when executing the swap
2.
Granted approval to the router when swapping from tokens
Obtaining Pool Addresses
It is necessary to specify which pools are to be used for the token swap. Get the list of pool addresses before proceeding.
Examples
USDC -> BUSD
swapTokensForExactTokens
Transferring tokens
Before swapping, the contract should be in possession of USDC. The caller can either send the tokens beforehand, or give allowance to the contract to call the transferFrom method. The short code snippet below showcases the latter.
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uint256 amountIn = 50 * 10 ** usdc.decimals();
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require(usdc.transferFrom(msg.sender, address(this), amountIn), 'transferFrom failed');
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Granting Approval
The next step is then to give the router some USDC 
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require(usdc.approve(address(buniCornRouter), amountIn), 'approve failed');
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swapTokensForExactTokens
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IERC20[] memory path = new address[](2);
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path[0] = usdc; // assuming core is specified as IERC20
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path[1] = busd; // assuming usdt is specified as IERC20
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buniCornRouter.swapTokensForExactTokens(
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    amountOutMin, // should be obtained via a price oracle, either off or on-chain
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    poolsPath, // eg. [usdc-busd-pool]
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    path,
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    msg.sender,
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    block.timestamp
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);
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Pool Addresses

Providing Liquidity

Last modified 3mo ago

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Contents

Using the Router

Obtaining Pool Addresses

Examples

USDC -> BUSD

swapTokensForExactTokens