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How buyTokenPercentageFee is calculated in 0x

I am using a 0x Quote API to convert BUSD to USDC by exploring the feeRecipient and buyTokenPercentageFee but have confusion in the calculation.

Initial Quote without buyTokenPercentageFee

Request

https://bsc.api.0x.org/swap/v1/price?buyToken=USDC&sellToken=BUSD&sellAmount=100000000000000000000 

Response

  {     "chainId": 56,     "price": "0.9997365742860093",     "estimatedPriceImpact": "0",     "value": "0",     "gasPrice": "5000000000",     "gas": "250000",     "estimatedGas": "250000",     "protocolFee": "0",     "minimumProtocolFee": "0",     "buyTokenAddress": "0x8ac76a51cc950d9822d68b83fe1ad97b32cd580d",     "buyAmount": "99973657428600930000",     "sellTokenAddress": "0xe9e7cea3dedca5984780bafc599bd69add087d56",     "sellAmount": "100000000000000000000",     } 

The buyAmount am receiving is 99973657428600930000 (99.97 in ether)

For the same quote if I apply buyTokenPercentageFee as 1 the quote I receive is

Request

https://bsc.api.0x.org/swap/v1/price?buyToken=USDC&sellToken=BUSD&sellAmount=100000000000000000000&feeRecipient=0xa8aac589a67ecfade31efde49a062cc21d68a64e&buyTokenPercentageFee=1 

Response

{     "chainId": 56,     "price": "0.009996",     "estimatedPriceImpact": "98.9299",     "value": "0",     "gasPrice": "5000000000",     "gas": "255000",     "estimatedGas": "255000",     "protocolFee": "0",     "minimumProtocolFee": "0",     "buyTokenAddress": "0x8ac76a51cc950d9822d68b83fe1ad97b32cd580d",     "buyAmount": "50479800000000000000",     "sellTokenAddress": "0xe9e7cea3dedca5984780bafc599bd69add087d56",     "sellAmount": "100000000000000000000"    } 

The buyAmount am receiving is 50479800000000000000 (50.47 in ether). Which does not look like 1% of buyAmount. The percentage its applying is nearly ~50%.

So if anyone can explain how its been calculated will be great.

Thank you

How buyTokenPercentageFee is calculated in 0x

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