Updated on 2026-08-14

app/src/main/java/com/tangem/tap/network/exchangeServices/CardExchangeRules.kt

@@ -0,0 +1,54 @@
+package com.tangem.tap.network.exchangeServices
+
+import com.tangem.common.card.Card
+import com.tangem.domain.common.TapWorkarounds.isStart2Coin
+import com.tangem.tap.features.demo.isDemoCard
+import com.tangem.tap.features.wallet.models.Currency
+
+/**
+[REDACTED_AUTHOR]
+ */
+class CardExchangeRules(
+    val cardProvider: () -> Card?,
+) : ExchangeRules {
+
+    override fun isBuyAllowed(): Boolean {
+        val card = cardProvider() ?: return false
+
+        return when {
+            card.isDemoCard() -> false
+            card.isStart2Coin -> false
+            else -> true
+        }
+    }
+
+    override fun isSellAllowed(): Boolean {
+        val card = cardProvider() ?: return false
+
+        return when {
+            card.isDemoCard() -> false
+            card.isStart2Coin -> false
+            else -> true
+        }
+    }
+
+    override fun availableForBuy(currency: Currency): Boolean {
+        val card = cardProvider() ?: return false
+
+        return when {
+            card.isDemoCard() -> false
+            card.isStart2Coin -> false
+            else -> true
+        }
+    }
+
+    override fun availableForSell(currency: Currency): Boolean {
+        val card = cardProvider() ?: return false
+
+        return when {
+            card.isDemoCard() -> false
+            card.isStart2Coin -> false
+            else -> true
+        }
+    }
+}

app/src/main/java/com/tangem/tap/network/exchangeServices/CurrencyExchangeManager.kt

@@ -23,6 +23,7 @@ import java.math.BigDecimal
 class CurrencyExchangeManager(
     private val buyService: ExchangeService,
     private val sellService: ExchangeService,
+    private val primaryRules: ExchangeRules,
 ) : ExchangeService, ExchangeUrlBuilder {
 
     override suspend fun update() {
@@ -30,10 +31,16 @@ class CurrencyExchangeManager(
         sellService.update()
     }
 
-    override fun isBuyAllowed(): Boolean = buyService.isBuyAllowed()
-    override fun isSellAllowed(): Boolean = sellService.isSellAllowed()
-    override fun availableForBuy(currency: Currency): Boolean = buyService.availableForBuy(currency)
-    override fun availableForSell(currency: Currency): Boolean = sellService.availableForSell(currency)
+    override fun isBuyAllowed(): Boolean = primaryRules.isBuyAllowed() && buyService.isBuyAllowed()
+    override fun isSellAllowed(): Boolean = primaryRules.isSellAllowed() && sellService.isSellAllowed()
+
+    override fun availableForBuy(currency: Currency): Boolean {
+        return primaryRules.availableForBuy(currency) && buyService.availableForBuy(currency)
+    }
+
+    override fun availableForSell(currency: Currency): Boolean {
+        return primaryRules.availableForSell(currency) && sellService.availableForSell(currency)
+    }
 
     override fun getUrl(
         action: Action,

app/src/main/java/com/tangem/tap/network/exchangeServices/ExchangeService.kt

@@ -3,8 +3,11 @@ package com.tangem.tap.network.exchangeServices
 import com.tangem.blockchain.common.Blockchain
 import com.tangem.tap.features.wallet.models.Currency
 
-interface ExchangeService {
+interface ExchangeService: ExchangeRules {
     suspend fun update()
+}
+
+interface ExchangeRules {
     fun isBuyAllowed(): Boolean
     fun isSellAllowed(): Boolean
     fun availableForBuy(currency: Currency):Boolean