Miner Fee trading out of FOX is $0.00 when entering a USD amount

[MBMaria]

Overview

When doing a trade out of FOX, the miner fee is $0.00 if you select a USD amount to trade. Selecting an amount in the native token gives an amount for the miner fee.

References and additional details

1. Log into app.shapeshift and connect to wallet of choice
2. Use trade modal on dashboard or navigate to trade page
3. Create a trade out of FOX, entering a USD amount
4. Note that the miner fee is $0.00
5. Select an amount to trade in fox token and note that a miner fee calculates
   

Acceptance Criteria

Selecting USD amount should calculate miner fee

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[MBMaria]

@0xApotheosis FYI

[gomesalexandre]

@MBMaria Can you confirm this state happened with a ZRX or CoW swap? As noted by @0xApotheosis in https://discord.com/channels/554694662431178782/1091123238089785405/1091177027828191263, 0 fee for CoW swaps is actually correct, as there is a 0$ native asset fee i.e CoW fees are taken from your sell ERC20 instead