diff --git a/lib/rpc/db/db.js b/lib/rpc/db/db.js
index e2a94e2..f13c69b 100644
--- a/lib/rpc/db/db.js
+++ b/lib/rpc/db/db.js
@@ -1,21 +1,27 @@
+import { inHex } from '../../format/input';
+
 export default class Db {
   constructor (transport) {
     this._transport = transport;
   }
 
   getHex (dbName, keyName) {
-    return this._transport.execute('db_getHex', dbName, keyName);
+    return this._transport
+      .execute('db_getHex', dbName, keyName);
   }
 
   getString (dbName, keyName) {
-    return this._transport.execute('db_getString', dbName, keyName);
+    return this._transport
+      .execute('db_getString', dbName, keyName);
   }
 
   putHex (dbName, keyName, hexData) {
-    return this._transport.execute('db_putHex', dbName, keyName, hexData);
+    return this._transport
+      .execute('db_putHex', dbName, keyName, inHex(hexData));
   }
 
   putString (dbName, keyName, stringData) {
-    return this._transport.execute('db_putString', dbName, keyName, stringData);
+    return this._transport
+      .execute('db_putString', dbName, keyName, stringData);
   }
 }
diff --git a/lib/rpc/db/db.spec.js b/lib/rpc/db/db.spec.js
new file mode 100644
index 0000000..6f9221a
--- /dev/null
+++ b/lib/rpc/db/db.spec.js
@@ -0,0 +1,22 @@
+import { TEST_HOST, TEST_PORT, mockRpc } from '../../../test/mockRpc';
+
+import Http from '../../transport/http';
+import Db from './db';
+
+const instance = new Db(new Http(TEST_HOST, TEST_PORT));
+
+describe('lib/Db', () => {
+  let scope;
+
+  describe('putHex', () => {
+    beforeEach(() => {
+      scope = mockRpc([{ method: 'db_putHex', reply: { result: [] } }]);
+    });
+
+    it('formats the inputs correctly', () => {
+      return instance.putHex('db', 'key', '1234').then(() => {
+        expect(scope.body.db_putHex.params).to.deep.equal(['db', 'key', '0x1234']);
+      });
+    });
+  });
+});
diff --git a/lib/rpc/eth/eth.spec.js b/lib/rpc/eth/eth.spec.js
index b408a8f..c409b93 100644
--- a/lib/rpc/eth/eth.spec.js
+++ b/lib/rpc/eth/eth.spec.js
@@ -15,7 +15,7 @@ describe('lib/Eth', () => {
       scope = mockRpc([{ method: 'eth_call', reply: { result: [] } }]);
     });
 
-    it('options & blockNumber', () => {
+    it('formats the input options & blockNumber', () => {
       return instance.call({ data: '12345678' }, 'earliest').then(() => {
         expect(scope.body.eth_call.params).to.deep.equal([{ data: '0x12345678' }, 'earliest']);
       });
@@ -47,6 +47,19 @@ describe('lib/Eth', () => {
     });
   });
 
+  describe('gasPrice', () => {
+    beforeEach(() => {
+      scope = mockRpc([{ method: 'eth_gasPrice', reply: { result: '0x123' } }]);
+    });
+
+    it('returns the fomratted price', () => {
+      return instance.gasPrice().then((price) => {
+        expect(isBigNumber(price)).to.be.true;
+        expect(price.toString(16)).to.deep.equal('123');
+      });
+    });
+  });
+
   describe('getBalance', () => {
     beforeEach(() => {
       scope = mockRpc([{ method: 'eth_getBalance', reply: { result: '0x123' } }]);
@@ -83,7 +96,7 @@ describe('lib/Eth', () => {
       });
     });
 
-    it('formats the input hash as a hash, default full = true', () => {
+    it('formats the input hash as a hash, full true', () => {
       return instance.getBlockByHash('1234', true).then(() => {
         expect(scope.body.eth_getBlockByHash.params).to.deep.equal(['0x1234', true]);
       });
@@ -95,4 +108,78 @@ describe('lib/Eth', () => {
       });
     });
   });
+
+  describe('getBlockByNumber', () => {
+    beforeEach(() => {
+      scope = mockRpc([{ method: 'eth_getBlockByNumber', reply: { result: { miner: address.toLowerCase() } } }]);
+    });
+
+    it('assumes blockNumber latest & full false', () => {
+      return instance.getBlockByNumber().then(() => {
+        expect(scope.body.eth_getBlockByNumber.params).to.deep.equal(['latest', false]);
+      });
+    });
+
+    it('uses input blockNumber & full false', () => {
+      return instance.getBlockByNumber('0x1234').then(() => {
+        expect(scope.body.eth_getBlockByNumber.params).to.deep.equal(['0x1234', false]);
+      });
+    });
+
+    it('formats the input blockNumber, full true', () => {
+      return instance.getBlockByNumber(0x1234, true).then(() => {
+        expect(scope.body.eth_getBlockByNumber.params).to.deep.equal(['0x1234', true]);
+      });
+    });
+
+    it('formats the output into block', () => {
+      return instance.getBlockByNumber(0x1234).then((block) => {
+        expect(block.miner).to.equal(address);
+      });
+    });
+  });
+
+  describe('getBlockTransactionCountByHash', () => {
+    beforeEach(() => {
+      scope = mockRpc([{ method: 'eth_getBlockTransactionCountByHash', reply: { result: '0x123' } }]);
+    });
+
+    it('formats input hash properly', () => {
+      return instance.getBlockTransactionCountByHash('abcdef').then(() => {
+        expect(scope.body.eth_getBlockTransactionCountByHash.params).to.deep.equal(['0xabcdef']);
+      });
+    });
+
+    it('formats the output number', () => {
+      return instance.getBlockTransactionCountByHash('0x1234').then((count) => {
+        expect(isBigNumber(count)).to.be.true;
+        expect(count.toString(16)).to.equal('123');
+      });
+    });
+  });
+
+  describe('getBlockTransactionCountByNumber', () => {
+    beforeEach(() => {
+      scope = mockRpc([{ method: 'eth_getBlockTransactionCountByNumber', reply: { result: '0x123' } }]);
+    });
+
+    it('specified blockNumber latest when none specified', () => {
+      return instance.getBlockTransactionCountByNumber().then(() => {
+        expect(scope.body.eth_getBlockTransactionCountByNumber.params).to.deep.equal(['latest']);
+      });
+    });
+
+    it('formats input blockNumber properly', () => {
+      return instance.getBlockTransactionCountByNumber(0xabcdef).then(() => {
+        expect(scope.body.eth_getBlockTransactionCountByNumber.params).to.deep.equal(['0xabcdef']);
+      });
+    });
+
+    it('formats the output number', () => {
+      return instance.getBlockTransactionCountByNumber('0x1234').then((count) => {
+        expect(isBigNumber(count)).to.be.true;
+        expect(count.toString(16)).to.equal('123');
+      });
+    });
+  });
 });
diff --git a/lib/rpc/web3/web3.spec.js b/lib/rpc/web3/web3.spec.js
new file mode 100644
index 0000000..ad3d5f9
--- /dev/null
+++ b/lib/rpc/web3/web3.spec.js
@@ -0,0 +1,22 @@
+import { TEST_HOST, TEST_PORT, mockRpc } from '../../../test/mockRpc';
+
+import Http from '../../transport/http';
+import Web3 from './web3';
+
+const instance = new Web3(new Http(TEST_HOST, TEST_PORT));
+
+describe('lib/Web3', () => {
+  let scope;
+
+  describe('sha3', () => {
+    beforeEach(() => {
+      scope = mockRpc([{ method: 'web3_sha3', reply: { result: [] } }]);
+    });
+
+    it('formats the inputs correctly', () => {
+      return instance.sha3('1234').then(() => {
+        expect(scope.body.web3_sha3.params).to.deep.equal(['0x1234']);
+      });
+    });
+  });
+});