Updated on 2026-08-14

core/ui/src/main/java/com/tangem/core/ui/format/bigdecimal/BigDecimalFiatFormat.kt

@@ -98,13 +98,22 @@ fun BigDecimalFiatFormatStyled.defaultAmount(spanStyleReference: SpanStyleRefere
     }
 
     val decimalSeparator = (formatter as? DecimalFormat)?.decimalFormatSymbols?.decimalSeparator
-    val formattedAmount = formatter.format(formattingAmount)
-        .replace(formatterCurrency.getSymbol(locale), fiatCurrencySymbol)
+    val currencySymbol = formatterCurrency.getSymbol(locale)
+    val rawFormatted = formatter.format(formattingAmount)
 
-    val separatorIndex = decimalSeparator?.let { formattedAmount.indexOf(it) } ?: formattedAmount.length
+    val separatorIndex = decimalSeparator?.let { rawFormatted.indexOf(it).takeIf { i -> i >= 0 } }
+        ?: rawFormatted.length
 
-    val wholePart = formattedAmount.take(separatorIndex)
-    val fractionalPart = formattedAmount.drop(separatorIndex)
+    val formattedAmount = rawFormatted.replace(currencySymbol, fiatCurrencySymbol)
+    val offset = fiatCurrencySymbol.length - currencySymbol.length
+    val adjustedIndex = if (rawFormatted.indexOf(currencySymbol) in 0 until separatorIndex) {
+        separatorIndex + offset
+    } else {
+        separatorIndex
+    }
+
+    val wholePart = formattedAmount.take(adjustedIndex)
+    val fractionalPart = formattedAmount.drop(adjustedIndex)
 
     combinedReference(
         if (formattingAmount.isLessThanThreshold()) stringReference(CAN_BE_LOWER_SIGN) else TextReference.EMPTY,
@@ -192,13 +201,22 @@ private fun BigDecimalFiatFormatStyled.price(spanStyleReference: SpanStyleRefere
     }
 
     val decimalSeparator = (formatter as? DecimalFormat)?.decimalFormatSymbols?.decimalSeparator
-    val formattedAmount = formatter.format(priceAmount)
-        .replace(formatterCurrency.getSymbol(locale), fiatCurrencySymbol)
+    val currencySymbol = formatterCurrency.getSymbol(locale)
+    val rawFormatted = formatter.format(priceAmount)
 
-    val separatorIndex = decimalSeparator?.let { formattedAmount.indexOf(it) } ?: formattedAmount.length
+    val separatorIndex = decimalSeparator?.let { rawFormatted.indexOf(it).takeIf { i -> i >= 0 } }
+        ?: rawFormatted.length
 
-    val wholePart = formattedAmount.take(separatorIndex)
-    val fractionalPart = formattedAmount.drop(separatorIndex)
+    val formattedAmount = rawFormatted.replace(currencySymbol, fiatCurrencySymbol)
+    val offset = fiatCurrencySymbol.length - currencySymbol.length
+    val adjustedIndex = if (rawFormatted.indexOf(currencySymbol) in 0 until separatorIndex) {
+        separatorIndex + offset
+    } else {
+        separatorIndex
+    }
+
+    val wholePart = formattedAmount.take(adjustedIndex)
+    val fractionalPart = formattedAmount.drop(adjustedIndex)
 
     combinedReference(
         stringReference(wholePart),

core/ui/src/test/kotlin/com/tangem/core/ui/format/bigdecimal/BigDecimalFiatFormatTest.kt

@@ -294,4 +294,52 @@ internal class BigDecimalFiatFormatTest {
         Truth.assertThat(formatted)
             .isEqualTo("0.00000000000000000000123".addUsdSymbolLeft())
     }
+
+    @Test
+    fun `price zero is formatted with default precision and does not crash`() {
+        val testValue = BigDecimal.ZERO
+
+        val formatted = testValue.format {
+            fiat(
+                fiatCurrencyCode = usdCurrencyCode,
+                fiatCurrencySymbol = usdSymbol,
+                locale = testLocale,
+            ).price()
+        }
+
+        Truth.assertThat(formatted)
+            .isEqualTo("0.00".addUsdSymbolLeft())
+    }
+
+    @Test
+    fun `price negative integer keeps sign and does not crash`() {
+        val testValue = BigDecimal("-500")
+
+        val formatted = testValue.format {
+            fiat(
+                fiatCurrencyCode = usdCurrencyCode,
+                fiatCurrencySymbol = usdSymbol,
+                locale = testLocale,
+            ).price()
+        }
+
+        Truth.assertThat(formatted)
+            .isEqualTo("-" + "500.00".addUsdSymbolLeft())
+    }
+
+    @Test
+    fun `price negative fractional keeps sign and does not crash`() {
+        val testValue = BigDecimal("-0.5")
+
+        val formatted = testValue.format {
+            fiat(
+                fiatCurrencyCode = usdCurrencyCode,
+                fiatCurrencySymbol = usdSymbol,
+                locale = testLocale,
+            ).price()
+        }
+
+        Truth.assertThat(formatted)
+            .isEqualTo("-" + "0.50".addUsdSymbolLeft())
+    }
 }

features/feed/impl/src/main/kotlin/com/tangem/features/feed/model/converter/MarketsTokenItemConverter.kt

@@ -91,7 +91,6 @@ internal class MarketsTokenItemConverter(
 
     private fun TokenMarket.getCurrentPrice(prev: TokenMarket? = null): MarketsListItemUM.Price {
         val prevPrice = prev?.tokenQuotesShort?.currentPrice
-
         val priceText = tokenQuotesShort.currentPrice.format {
             fiat(
                 fiatCurrencyCode = appCurrency.code,