diff --git a/README.md b/README.md
index 37e13282e..87e1c8c02 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ Add the following dependency to your project:
    <dependency>
      <groupId>org.web3j</groupId>
      <artifactId>core</artifactId>
-     <version>0.1.2</version>
+     <version>0.1.3</version>
    </dependency>
 ```
 
@@ -43,7 +43,7 @@ Add the following dependency to your project:
 repositories {
    maven {url "http://dl.bintray.com/web3j/maven"}
 }
-compile ("org.web3j:core:0.1.2")
+compile ("org.web3j:core:0.1.3")
 ```
 
 Start up an Ethereum client if you don't already have one running, such as [Geth](https://github.com/ethereum/go-ethereum/wiki/geth):
diff --git a/build.gradle b/build.gradle
index 379f0e95b..c65f0a1f3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,7 +7,7 @@ apply plugin: 'jacoco'
 apply plugin: 'maven-publish'
 
 group 'org.web3j'
-version '0.1.2'
+version '0.1.3'
 
 sourceCompatibility = 1.8
 
diff --git a/src/integration-test/java/org/web3j/protocol/jsonrpc20/ProtocolIT.java b/src/integration-test/java/org/web3j/protocol/jsonrpc20/ProtocolIT.java
index 256ad73a2..f308b9259 100644
--- a/src/integration-test/java/org/web3j/protocol/jsonrpc20/ProtocolIT.java
+++ b/src/integration-test/java/org/web3j/protocol/jsonrpc20/ProtocolIT.java
@@ -217,7 +217,7 @@ public void testEthCall() throws Exception {
     public void testEthEstimateGas() throws Exception {
         EthEstimateGas ethEstimateGas = web3j.ethEstimateGas(config.ethCall())
                 .send();
-        assertThat(ethEstimateGas.getAmountUsed(), equalTo(BigInteger.valueOf(50000000)));
+        assertTrue(ethEstimateGas.getAmountUsed().signum() == 1);
     }
 
     @Test
diff --git a/src/main/java/org/web3j/methods/request/EthCall.java b/src/main/java/org/web3j/methods/request/EthCall.java
index 8cec19eb8..7a118913c 100644
--- a/src/main/java/org/web3j/methods/request/EthCall.java
+++ b/src/main/java/org/web3j/methods/request/EthCall.java
@@ -11,35 +11,35 @@
  */
 @JsonInclude(JsonInclude.Include.NON_NULL)
 public class EthCall {
-    private String fromAddress;
-    private String toAddress;
+    private String from;
+    private String to;
     private BigInteger gas;
     private BigInteger gasPrice;
     private BigInteger value;
     private String data;
 
-    public EthCall(String toAddress, String data) {
-        this.toAddress = toAddress;
+    public EthCall(String to, String data) {
+        this.to = to;
         this.data = data;
     }
 
-    public EthCall(String fromAddress, String toAddress,
+    public EthCall(String from, String to,
                    BigInteger gas, BigInteger gasPrice,
                    BigInteger value, String data) {
-        this.fromAddress = fromAddress;
-        this.toAddress = toAddress;
+        this.from = from;
+        this.to = to;
         this.gas = gas;
         this.gasPrice = gasPrice;
         this.value = value;
         this.data = data;
     }
 
-    public String getFromAddress() {
-        return fromAddress;
+    public String getFrom() {
+        return from;
     }
 
-    public String getToAddress() {
-        return toAddress;
+    public String getTo() {
+        return to;
     }
 
     public String getGas() {
diff --git a/src/main/java/org/web3j/methods/request/EthSendTransaction.java b/src/main/java/org/web3j/methods/request/EthSendTransaction.java
index afb3dd634..9ec2fd33e 100644
--- a/src/main/java/org/web3j/methods/request/EthSendTransaction.java
+++ b/src/main/java/org/web3j/methods/request/EthSendTransaction.java
@@ -11,24 +11,24 @@
  */
 @JsonInclude(JsonInclude.Include.NON_NULL)
 public class EthSendTransaction {
-    private String fromAddress;
-    private String toAddress;
+    private String from;
+    private String to;
     private BigInteger gas;
     private BigInteger gasPrice;
     private BigInteger value;
     private String data;
     private BigInteger nonce;
 
-    public EthSendTransaction(String fromAddress, String data) {
-        this.fromAddress = fromAddress;
+    public EthSendTransaction(String from, String data) {
+        this.from = from;
         this.data = data;
     }
 
-    public EthSendTransaction(String fromAddress, String toAddress,
+    public EthSendTransaction(String from, String to,
                               BigInteger gas, BigInteger gasPrice,
                               BigInteger value, String data, BigInteger nonce) {
-        this.fromAddress = fromAddress;
-        this.toAddress = toAddress;
+        this.from = from;
+        this.to = to;
         this.gas = gas;
         this.gasPrice = gasPrice;
         this.value = value;
@@ -36,12 +36,12 @@ public EthSendTransaction(String fromAddress, String toAddress,
         this.nonce = nonce;
     }
 
-    public String getFromAddress() {
-        return fromAddress;
+    public String getFrom() {
+        return from;
     }
 
-    public String getToAddress() {
-        return toAddress;
+    public String getTo() {
+        return to;
     }
 
     public String getGas() {
diff --git a/src/main/java/org/web3j/methods/response/EthBlock.java b/src/main/java/org/web3j/methods/response/EthBlock.java
index e8427071b..c485c47af 100644
--- a/src/main/java/org/web3j/methods/response/EthBlock.java
+++ b/src/main/java/org/web3j/methods/response/EthBlock.java
@@ -359,8 +359,11 @@ public static class TransactionObject extends Transaction implements Transaction
         public TransactionObject() {
         }
 
-        public TransactionObject(String hash, String nonce, String blockHash, String blockNumber, String transactionIndex, String fromAddress, String toAddress, String value, String gasPrice, String gas, String input) {
-            super(hash, nonce, blockHash, blockNumber, transactionIndex, fromAddress, toAddress, value, gasPrice, gas, input);
+        public TransactionObject(String hash, String nonce, String blockHash, String blockNumber,
+                                 String transactionIndex, String from, String to, String value,
+                                 String gasPrice, String gas, String input) {
+            super(hash, nonce, blockHash, blockNumber, transactionIndex, from, to, value,
+                    gasPrice, gas, input);
         }
 
         @Override
diff --git a/src/test/java/org/web3j/protocol/jsonrpc20/RequestTest.java b/src/test/java/org/web3j/protocol/jsonrpc20/RequestTest.java
index ca9a2d925..3173ecb81 100644
--- a/src/test/java/org/web3j/protocol/jsonrpc20/RequestTest.java
+++ b/src/test/java/org/web3j/protocol/jsonrpc20/RequestTest.java
@@ -41,7 +41,7 @@ public void testEthCall() throws Exception {
         web3j.ethCall(new EthCall("0x52b93c80364dc2dd4444c146d73b9836bbbb2b3f", "0x0"),
                 DefaultBlockParameter.valueOf("latest")).send();
 
-        verifyResult("{\"jsonRpc\":\"2.0\",\"method\":\"eth_call\",\"params\":[{\"toAddress\":\"0x52b93c80364dc2dd4444c146d73b9836bbbb2b3f\",\"data\":\"0x0\"},\"latest\"],\"id\":1}");
+        verifyResult("{\"jsonRpc\":\"2.0\",\"method\":\"eth_call\",\"params\":[{\"to\":\"0x52b93c80364dc2dd4444c146d73b9836bbbb2b3f\",\"data\":\"0x0\"},\"latest\"],\"id\":1}");
     }
 
     private void verifyResult(String expected) throws Exception {