diff --git a/chainlib/eth/contract.py b/chainlib/eth/contract.py
index 4ab234b..327cdf9 100644
--- a/chainlib/eth/contract.py
+++ b/chainlib/eth/contract.py
@@ -61,6 +61,10 @@ class ABIContractDecoder:
         return bool(self.uint256(v))
 
 
+    def boolean(self, v):
+        return bool(self.uint256(v))
+
+
     def address(self, v):
         a = strip_0x(v)[64-40:]
         return to_checksum_address(a)
@@ -143,6 +147,16 @@ class ABIContractEncoder:
         self.__log_latest(v)
 
 
+    def bool(self, v):
+        return self.boolean(v)
+
+
+    def boolean(self, v):
+        if bool(v):
+            return self.uint256(1)
+        return self.uint256(0)
+
+
     def address(self, v):
         self.bytes_fixed(32, v, 20)
         self.types.append(ABIContractType.ADDRESS)
@@ -161,6 +175,7 @@ class ABIContractEncoder:
         self.__log_latest(v)
 
 
+
     def string(self, v):
         b = v.encode('utf-8')
         l = len(b)
diff --git a/setup.cfg b/setup.cfg
index 08a32ce..e7df6b5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = chainlib
-version = 0.0.3a2
+version = 0.0.3a3
 description = Generic blockchain access library and tooling
 author = Louis Holbrook
 author_email = dev@holbrook.no