Fees

EthAnchor is built using various blockchain infrastructure, which charges fees on their usage. Using EthAnchor incurs fees that are calculated based on the deposit / redeem amount. Fees listed at this section are applied independent of gas spent on Ethereum transactions.
Operation
# of Shuttle Fee
# of Terra Tax
deposit_stable
Once
Once
redeem_stable
Once
Twice
Shuttle Fee
Shuttle ignores transfer requests with a transfer value smaller than 1 UST.
Cross-chain transfers of Terra stablecoins and aTerra tokens between Ethereum and Terra are facilitated with the use of Shuttle. Shuttle charges a fee only for cross-chain token transfers from Terra to Ethereum, with the fee amount being: 
shuttleFee=max(1 UST, transferAmount⋅0.1%)\text{shuttleFee}=\text{max} (1\,\text{UST},\,\text{transferAmount} \cdot 0.1\% )shuttleFee=max(1UST,transferAmount⋅0.1%)
0.1% of the transfer amount is charged as Shuttle fees, decreasing with the transfer amount until the fee reaches the 1 UST minimum. Amount received after fees will be: 
receiveAmount=(1−shuttleFee)⋅transferAmount\text{receiveAmount} = (1-\text{shuttleFee}) \cdot \text{transferAmount}receiveAmount=(1−shuttleFee)⋅transferAmount
Note that this fee will be applied once for both deposit_stable and redeem_stable.
Terra Blockchain Tax
Terra stablecoin transfers that occur on the Terra blockchain are require a Terra tax (protocol fee) to be paid. Tax amount is dependent on the transfer amount, represented as: 
terraTax=min(taxCap,transferAmount⋅taxRate)\text{terraTax} = \text{min}(\text{taxCap}, \text{transferAmount}\cdot\text{taxRate})terraTax=min(taxCap,transferAmount⋅taxRate)
Tax amount increases with as transfer amount increases, until it reaches a cap of 1 TerraSDR (SDT), currently valued at around ~1.42 UST. Terra SDR is a Terra stablecoin pegged to the International Monetary Fund's Special Drawing Rights (SDR) and its value -- along with the tax cap -- may differ as exchange rates vary with time.
EthAnchor is configured to automatically deduct the amount of stablecoins required for tax before making Terra-side transfers. Thus the post-transfer receive amount will be: 
receiveAmount=11+terraTax⋅transferAmount\text{receiveAmount} = \frac{1}{1+\text{terraTax}}\cdot\text{transferAmount}receiveAmount=1+terraTax1​⋅transferAmount
Note that this tax fee is applied once for deposit_stable and twice for redeem_stable.
Redeeming Stablecoins
Last modified 2yr ago
Operation	# of Shuttle Fee	# of Terra Tax
`deposit_stable`	Once	Once
`redeem_stable`	Once	Twice