diff --git a/assembly/Arrays/ByteArray.ts b/assembly/Arrays/ByteArray.ts
index 35f91d2..93d52cb 100644
--- a/assembly/Arrays/ByteArray.ts
+++ b/assembly/Arrays/ByteArray.ts
@@ -27,7 +27,7 @@ export class ByteArray extends AbstractArray<Byte, u8> {
     public toHexString (): string {
         let result = "0x";
         for (let i = 0; i < super.values.length; i++) {
-            const str = super.values[i].toString();
+            const str = super.values[i].toString(16);
             if (str.length == 1) {
                 result += "0";
             }
diff --git a/assembly/__tests__/ScaleString.spec.ts b/assembly/__tests__/ScaleString.spec.ts
index 831602c..59439cd 100644
--- a/assembly/__tests__/ScaleString.spec.ts
+++ b/assembly/__tests__/ScaleString.spec.ts
@@ -47,6 +47,15 @@ describe("String", () => {
         expect<string>(scaleString1.toString()).toStrictEqual("da");
     });
 
+    it("should encode to hex", () => {
+        const scaleString = new ScaleString("as-scale-codec");
+        expect<string>(scaleString.toHexString()).toStrictEqual("0x61732d7363616c652d636f646563");
+        const scaleString1 = new ScaleString("The 1963 Impala featured rectilinear styling with an engine-turned aluminum rear taillight panel surrounded by a chrome border on SS models.");
+        expect<string>(scaleString1.toHexString()).toStrictEqual("0x546865203139363320496d70616c612066656174757265642072656374696c696e656172207374796c696e67207769746820616e20656e67696e652d7475726e656420616c756d696e756d2072656172207461696c6c696768742070616e656c20737572726f756e6465642062792061206368726f6d6520626f72646572206f6e205353206d6f64656c732e");
+        const scaleString2 = new ScaleString("A set of words that is complete in itself, typically containing a subject and predicate");
+        expect<string>(scaleString2.toHexString()).toStrictEqual("0x4120736574206f6620776f726473207468617420697320636f6d706c65746520696e20697473656c662c207479706963616c6c7920636f6e7461696e696e672061207375626a65637420616e6420707265646963617465");
+    })
+
     itThrows("should throw on incorrect encoding", () => {
         ScaleString.fromU8a([0x04]); // Encoded length = 1, actual data length = 0
     });
diff --git a/assembly/index.ts b/assembly/index.ts
index 09ac127..e425cd6 100644
--- a/assembly/index.ts
+++ b/assembly/index.ts
@@ -4,7 +4,7 @@ export * from "./Byte";
 export * from "./BytesReader";
 export * from "./Hash";
 export * from "./Int";
-export * from "./interfaces/Codec";
+export * from "./interfaces";
 export * from "./ScaleMap";
 export * from "./ScaleString";
 export * from "./UInt";
diff --git a/assembly/interfaces/index.ts b/assembly/interfaces/index.ts
new file mode 100644
index 0000000..e6c2fdb
--- /dev/null
+++ b/assembly/interfaces/index.ts
@@ -0,0 +1,3 @@
+export * from './Codec';
+export * from './DecodedData';
+export * from './UnwrappableCodec';
diff --git a/package-lock.json b/package-lock.json
index b20936f..0512bed 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "as-scale-codec",
-  "version": "0.1.1",
+  "version": "0.2.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 6ad43ab..0d0cd10 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "as-scale-codec",
-  "version": "0.1.1",
+  "version": "0.2.1",
   "description": "AssemblyScript implementation of the SCALE codec used in the Parity Substrate framework",
   "main": "./assembly/index.ts",
   "contributors": [