diff --git a/src/Nethereum.ABI/Model/ModelExtensions.cs b/src/Nethereum.ABI/Model/ModelExtensions.cs
new file mode 100644
index 000000000..47d5f2010
--- /dev/null
+++ b/src/Nethereum.ABI/Model/ModelExtensions.cs
@@ -0,0 +1,90 @@
+using Nethereum.ABI.FunctionEncoding;
+using Nethereum.Hex.HexConvertors.Extensions;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Nethereum.ABI.Model
+{
+    public static class ModelExtensions
+    {
+        public static FunctionABI FindFunctionABI(this ContractABI contractABI, string signature) 
+        {
+            foreach (var functionABI in contractABI.Functions)
+            {
+                if (functionABI.IsSignatureForFunction(signature))
+                {
+                    return functionABI;
+                }
+            }
+            return null;
+        }
+
+        public static FunctionABI FindFunctionABIFromInputData(this ContractABI contractABI, string inputData)
+        {
+            if (string.IsNullOrEmpty(inputData)) return null;
+            inputData = inputData.EnsureHexPrefix();
+            if(inputData.Length < 10) return null;
+            var signature = inputData.Substring(0, 10);
+            return contractABI.FindFunctionABI(signature); 
+        }
+
+
+        public static EventABI FindEventABI(this ContractABI contractABI, string signature)
+        {
+            foreach (var eventABI in contractABI.Events)
+            {
+                if (eventABI.IsSignatureForEvent(signature))
+                {
+                    return eventABI;
+                }
+            }
+            return null;
+        }
+
+        public static ErrorABI FindErrorABI(this ContractABI contractABI, string signature)
+        {
+            foreach (var errorAbi in contractABI.Errors)
+            {
+                if (errorAbi.IsSignatureForError(signature))
+                {
+                    return errorAbi;
+                }
+            }
+            return null;
+        }
+
+        public static bool IsSignatureForFunction(this FunctionABI functionABI, string sha3Signature)
+        {
+            sha3Signature = sha3Signature.EnsureHexPrefix();
+            var functionSignature = functionABI.Sha3Signature.EnsureHexPrefix();
+
+            if (sha3Signature == "0x") return false;
+
+            if (string.Equals(sha3Signature.ToLower(), functionSignature.ToLower(), StringComparison.Ordinal)) return true;
+            return false;
+        }
+
+        public static bool IsSignatureForEvent(this EventABI eventABI, string sha3Signature)
+        {
+            sha3Signature = sha3Signature.EnsureHexPrefix();
+            var eventSignature = eventABI.Sha3Signature.EnsureHexPrefix();
+
+            if (sha3Signature == "0x") return false;
+
+            if (string.Equals(sha3Signature.ToLower(), eventSignature.ToLower(), StringComparison.Ordinal)) return true;
+            return false;
+        }
+
+        public static bool IsSignatureForError(this ErrorABI errorABI, string sha3Signature)
+        {
+            sha3Signature = sha3Signature.EnsureHexPrefix();
+            var errorSignature = errorABI.Sha3Signature.EnsureHexPrefix();
+
+            if (sha3Signature == "0x") return false;
+
+            if (string.Equals(sha3Signature.ToLower(), errorSignature.ToLower(), StringComparison.Ordinal)) return true;
+            return false;
+        }
+    }
+}