diff --git a/src/main/kotlin/net/thauvin/erik/crypto/CryptoException.kt b/src/main/kotlin/net/thauvin/erik/crypto/CryptoException.kt
index b5303df..1cd9dc7 100644
--- a/src/main/kotlin/net/thauvin/erik/crypto/CryptoException.kt
+++ b/src/main/kotlin/net/thauvin/erik/crypto/CryptoException.kt
@@ -37,6 +37,7 @@ package net.thauvin.erik.crypto
  */
 class CryptoException @JvmOverloads constructor(
     var statusCode: Int = NO_STATUS,
+    var id: String,
     message: String,
     cause: Throwable? = null
 ) : Exception(message, cause) {
diff --git a/src/main/kotlin/net/thauvin/erik/crypto/CryptoPrice.kt b/src/main/kotlin/net/thauvin/erik/crypto/CryptoPrice.kt
index f8c5b4b..0746f7d 100644
--- a/src/main/kotlin/net/thauvin/erik/crypto/CryptoPrice.kt
+++ b/src/main/kotlin/net/thauvin/erik/crypto/CryptoPrice.kt
@@ -73,9 +73,9 @@ open class CryptoPrice(val base: String, val currency: String, val amount: BigDe
                     return CryptoPrice(getString("base"), getString("currency"), getString("amount").toBigDecimal())
                 }
             } catch (e: NumberFormatException) {
-                throw CryptoException(message = "Could not convert amount to number.", cause = e)
+                throw CryptoException(id = "convert_error", message = "Could not convert amount to number.", cause = e)
             } catch (e: JSONException) {
-                throw CryptoException(message = "Could not parse price data.", cause = e)
+                throw CryptoException(id = "parse_error", message = "Could not parse price data.", cause = e)
             }
         }
 
@@ -101,17 +101,24 @@ open class CryptoPrice(val base: String, val currency: String, val amount: BigDe
 
             val request = Request.Builder().url(httpUrl).build()
             val response = client.newCall(request).execute()
-            val body = response.body?.string() ?: throw CryptoException(response.code, "Empty response.")
+            val body = response.body?.string() ?: throw CryptoException(
+                response.code,
+                id = "empty_response",
+                message = "Empty response."
+            )
             try {
                 val json = JSONObject(body)
                 if (response.isSuccessful) {
                     return body
                 } else {
                     val data = json.getJSONArray("errors")
-                    throw CryptoException(response.code, data.getJSONObject(0).getString("message"))
+                    throw CryptoException(
+                        response.code, data.getJSONObject(0).getString("id"),
+                        data.getJSONObject(0).getString("message")
+                    )
                 }
             } catch (e: JSONException) {
-                throw CryptoException(response.code, "Could not parse data.", e)
+                throw CryptoException(response.code, id = "parse_error", "Could not parse data.", e)
             }
         }
 
diff --git a/src/test/kotlin/net/thauvin/erik/crypto/CryptoPriceTest.kt b/src/test/kotlin/net/thauvin/erik/crypto/CryptoPriceTest.kt
index cb27271..303b7fb 100644
--- a/src/test/kotlin/net/thauvin/erik/crypto/CryptoPriceTest.kt
+++ b/src/test/kotlin/net/thauvin/erik/crypto/CryptoPriceTest.kt
@@ -134,6 +134,13 @@ class CryptoPriceTest {
             block = { spotPrice("FOO") }
         )
 
+        try {
+            spotPrice("BAR")
+        } catch (e: CryptoException) {
+            assertThat(e.id, "spotPrice(bar) error id").isEqualTo("not_found")
+            assertThat(e.message, "spotPrice(bar) error message").isEqualTo("Invalid base currency")
+        }
+
         assertFailsWith(
             message = "buyPrice(BTC,BAR)",
             exceptionClass = CryptoException::class,
@@ -183,7 +190,11 @@ class CryptoPriceTest {
         assertEquals("A$12,345.60", aud.toCurrency(), "CryptoPrice(LTC,AUD)")
 
         val dk = CryptoPrice("BCH", "DKK", d)
-        assertEquals("12.345,60 kr.", dk.toCurrency(Locale("da", "DK")), "CryptoPrice(BCH,DKK)")
+        assertEquals(
+            "12.345,60 kr.", dk.toCurrency(
+                Locale.Builder().setLanguage("da").setRegion("DK").build()
+            ), "CryptoPrice(BCH,DKK)"
+        )
 
         val jp = CryptoPrice("BTC", "JPY", d)
         assertEquals("￥12,345.60", jp.toCurrency(Locale.JAPAN), "CryptoPrice(BTC,JPY)")