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src/Contracts/ApiJsonOptions.cs

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+using System.Text.Json;
+using Contracts.Json;
+
+namespace Contracts;
+
+public static class ApiJsonOptions
+{
+    public static JsonSerializerOptions Instance { get; } = Create();
+
+    private static JsonSerializerOptions Create()
+    {
+        var options = new JsonSerializerOptions
+        {
+            PropertyNamingPolicy = null,
+        };
+
+        options.Converters.Add(new DecimalFromStringJsonConverter());
+        return options;
+    }
+}