сделан impl

src/main/kotlin/su/redume/core/network/api/FiatCurrencyServer.kt

@@ -0,0 +1,7 @@
+package su.redume.core.network.api
+
+import su.redume.core.network.model.CurrencyDto
+
+interface FiatCurrencyServer {
+    suspend fun currency(): List<CurrencyDto>
+}

src/main/kotlin/su/redume/core/network/impl/FiatCurrencyServerImpl.kt

@@ -0,0 +1,31 @@
+package su.redume.core.network.impl
+
+import io.ktor.client.*
+import io.ktor.client.call.*
+import io.ktor.serialization.kotlinx.json.json
+import kotlinx.serialization.json.Json
+import io.ktor.client.plugins.defaultRequest
+import io.ktor.http.*
+import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
+import io.ktor.client.request.*
+import javax.inject.Inject
+import su.redume.core.network.api.FiatCurrencyServer
+import su.redume.core.network.model.CurrencyDto
+
+class FiatCurrencyServerImpl @Inject constructor() : FiatCurrencyServer {
+    private val httpClient = HttpClient {
+        install(ContentNegotiation) {
+            json(
+                Json {
+                    ignoreUnknownKeys = true
+                }
+            )
+        }
+        defaultRequest {
+            contentType(ContentType.Application.Json)
+            url("https://duckduckgo.com/js/spice/currency/1/")
+        }
+    }
+
+    override suspend fun currency(value: String, pair: String): List<CurrencyDto> = httpClient.get("$value/$pair").body()
+}