Updated on 2026-08-14

app/src/main/java/com/tangem/tap/features/send/redux/reducers/FeeReducer.kt

@@ -1,13 +1,9 @@
 package com.tangem.tap.features.send.redux.reducers
 
 import com.tangem.blockchain.common.Amount
-import com.tangem.blockchain.common.AmountType
-import com.tangem.blockchain.common.Blockchain
-import com.tangem.tap.common.extensions.fullNameWithoutTestnet
 import com.tangem.tap.features.send.redux.FeeAction
 import com.tangem.tap.features.send.redux.FeeActionUi
 import com.tangem.tap.features.send.redux.SendScreenAction
-import com.tangem.tap.features.send.redux.states.FeePrecision
 import com.tangem.tap.features.send.redux.states.FeeState
 import com.tangem.tap.features.send.redux.states.FeeType
 import com.tangem.tap.features.send.redux.states.SendState
@@ -28,10 +24,9 @@ class FeeReducer : SendInternalReducer {
             is FeeActionUi.ChangeSelectedFee -> {
                 val currentFee = createValueOfFeeAmount(action.feeType, state.feeList)
                 state.copy(
-                        selectedFeeType = action.feeType,
-                        currentFee = currentFee
+                    selectedFeeType = action.feeType,
+                    currentFee = currentFee,
                 )
-
             }
             is FeeActionUi.ChangeIncludeFee -> state.copy(feeIsIncluded = action.isIncluded)
         }
@@ -46,9 +41,9 @@ class FeeReducer : SendInternalReducer {
             is FeeAction.ChangeLayoutVisibility -> {
                 fun getVisibility(current: Boolean, proposed: Boolean?): Boolean = proposed ?: current
                 state.copy(
-                        mainLayoutIsVisible = getVisibility(state.mainLayoutIsVisible, action.main),
-                        controlsLayoutIsVisible = getVisibility(state.controlsLayoutIsVisible, action.controls),
-                        feeChipGroupIsVisible = getVisibility(state.feeChipGroupIsVisible, action.chipGroup)
+                    mainLayoutIsVisible = getVisibility(state.mainLayoutIsVisible, action.main),
+                    controlsLayoutIsVisible = getVisibility(state.controlsLayoutIsVisible, action.controls),
+                    feeChipGroupIsVisible = getVisibility(state.feeChipGroupIsVisible, action.chipGroup),
                 )
             }
             is FeeAction.FeeCalculation.SetFeeResult -> {
@@ -58,30 +53,30 @@ class FeeReducer : SendInternalReducer {
                     val currentFee = createValueOfFeeAmount(feeType, fees)
 
                     state.copy(
-                            selectedFeeType = feeType,
-                            feeList = fees,
-                            currentFee = currentFee,
-                            error = null,
-                            feePrecision = getFeePrecision(sendState)
+                        selectedFeeType = feeType,
+                        feeList = fees,
+                        currentFee = currentFee,
+                        error = null,
+                        feeIsApproximate = isFeeApproximate(sendState),
                     )
                 } else {
                     val feeType = getCurrentFeeType(state)
                     val currentFee = createValueOfFeeAmount(feeType, fees)
 
                     state.copy(
-                            selectedFeeType = feeType,
-                            feeList = fees,
-                            currentFee = currentFee,
-                            error = null,
-                            feePrecision = getFeePrecision(sendState)
+                        selectedFeeType = feeType,
+                        feeList = fees,
+                        currentFee = currentFee,
+                        error = null,
+                        feeIsApproximate = isFeeApproximate(sendState),
                     )
                 }
             }
             is FeeAction.FeeCalculation.SetFeeError -> {
                 state.copy(
-                        feeList = null,
-                        currentFee = null,
-                        error = action.error
+                    feeList = null,
+                    currentFee = null,
+                    error = action.error,
                 )
             }
         }
@@ -104,20 +99,12 @@ class FeeReducer : SendInternalReducer {
         }
     }
 
-    private fun getFeePrecision(sendState: SendState): FeePrecision {
-        val blockchain = sendState.walletManager?.wallet?.blockchain
-        return if (
-            (blockchain?.fullNameWithoutTestnet == Blockchain.Arbitrum.fullName ||
-                blockchain?.fullNameWithoutTestnet == Blockchain.Tron.fullName ||
-                blockchain?.fullNameWithoutTestnet == Blockchain.Gnosis.fullName) &&
-            sendState.amountState.typeOfAmount is AmountType.Token
-        ) {
-            FeePrecision.CAN_BE_LOWER
-        } else {
-            FeePrecision.PRECISE
-        }
-    }
+    private fun isFeeApproximate(sendState: SendState): Boolean {
+        val blockchain = sendState.walletManager?.wallet?.blockchain ?: return false
 
+        val amountType = sendState.amountState.typeOfAmount
+        return blockchain.isFeeApproximate(amountType)
+    }
 
     private fun getCurrentFeeType(state: FeeState): FeeType {
         return if (state.selectedFeeType == FeeType.SINGLE) FeeType.NORMAL else state.selectedFeeType

app/src/main/java/com/tangem/tap/features/send/redux/reducers/ReceiptReducer.kt

@@ -6,7 +6,18 @@ import com.tangem.tap.common.extensions.scaleToFiat
 import com.tangem.tap.common.extensions.stripZeroPlainString
 import com.tangem.tap.features.send.redux.ReceiptAction.RefreshReceipt
 import com.tangem.tap.features.send.redux.SendScreenAction
-import com.tangem.tap.features.send.redux.states.*
+import com.tangem.tap.features.send.redux.states.AmountState
+import com.tangem.tap.features.send.redux.states.FeeState
+import com.tangem.tap.features.send.redux.states.MainCurrencyType
+import com.tangem.tap.features.send.redux.states.ReceiptCrypto
+import com.tangem.tap.features.send.redux.states.ReceiptFiat
+import com.tangem.tap.features.send.redux.states.ReceiptLayoutType
+import com.tangem.tap.features.send.redux.states.ReceiptState
+import com.tangem.tap.features.send.redux.states.ReceiptSymbols
+import com.tangem.tap.features.send.redux.states.ReceiptTokenCrypto
+import com.tangem.tap.features.send.redux.states.ReceiptTokenFiat
+import com.tangem.tap.features.send.redux.states.SendState
+import com.tangem.tap.features.wallet.redux.WalletState.Companion.CAN_BE_LOWER_SIGN
 import com.tangem.tap.features.wallet.redux.WalletState.Companion.UNKNOWN_AMOUNT_SIGN
 import com.tangem.tap.store
 import java.math.BigDecimal
@@ -125,8 +136,7 @@ class ReceiptReducer : SendInternalReducer {
             val totalFiat = amountFiat.plus(feeFiat)
             ReceiptTokenFiat(
                 amountFiat = amountFiat.scaleToFiat(true).stripZeroPlainString(),
-                feeFiat = feeFiat.scaleToFiat(true)
-                    .stripZeroPlainString().addPrecisionSign(),
+                feeFiat = feeFiat.scaleToFiat(true).stripZeroPlainString().addPrecisionSign(),
                 totalFiat = totalFiat.scaleToFiat(true).stripZeroPlainString(),
                 willSentToken = tokensToSend.stripZeroPlainString(),
                 willSentFeeCoin = feeCoin.stripZeroPlainString(),
@@ -207,6 +217,8 @@ class ReceiptReducer : SendInternalReducer {
         }
     }
 
-    private fun String.addPrecisionSign(): String =
-        ("${feeState.feePrecision.symbol} $this").trim()
+    private fun String.addPrecisionSign(): String {
+        val result = if (feeState.feeIsApproximate) "$CAN_BE_LOWER_SIGN $this" else ""
+        return result.trim()
+    }
 }

app/src/main/java/com/tangem/tap/features/send/redux/states/FeeState.kt

@@ -11,21 +11,17 @@ enum class FeeType {
     SINGLE, LOW, NORMAL, PRIORITY
 }
 
-enum class FeePrecision(val symbol: String) {
-    PRECISE(""), CAN_BE_LOWER("<")
-}
-
 data class FeeState(
-        val selectedFeeType: FeeType = FeeType.NORMAL,
-        val feeList: List<Amount>? = null,
-        val currentFee: Amount? = null,
-        val feeIsIncluded: Boolean = false,
-        val mainLayoutIsVisible: Boolean = false,
-        val controlsLayoutIsVisible: Boolean = false,
-        val feeChipGroupIsVisible: Boolean = true,
-        val includeFeeSwitcherIsEnabled: Boolean = true,
-        val error: FeeAction.Error? = null,
-        val feePrecision: FeePrecision = FeePrecision.PRECISE
+    val selectedFeeType: FeeType = FeeType.NORMAL,
+    val feeList: List<Amount>? = null,
+    val currentFee: Amount? = null,
+    val feeIsIncluded: Boolean = false,
+    val feeIsApproximate: Boolean = false,
+    val mainLayoutIsVisible: Boolean = false,
+    val controlsLayoutIsVisible: Boolean = false,
+    val feeChipGroupIsVisible: Boolean = true,
+    val includeFeeSwitcherIsEnabled: Boolean = true,
+    val error: FeeAction.Error? = null,
 ) : SendScreenState {
 
     override val stateId: StateId = StateId.FEE

app/src/main/java/com/tangem/tap/features/wallet/redux/WalletState.kt

@@ -287,6 +287,7 @@ data class WalletState(
     companion object {
         const val UNKNOWN_AMOUNT_SIGN = "—"
         const val ROUGH_SIGN = "≈"
+        const val CAN_BE_LOWER_SIGN = "<"
     }
 }