diff --git a/packages/api-format/package.json b/packages/api-format/package.json
index 5739d8f904c3..bcd8d4c249e6 100644
--- a/packages/api-format/package.json
+++ b/packages/api-format/package.json
@@ -34,7 +34,7 @@
   },
   "dependencies": {
     "@polkadot/primitives-json": "^0.9.5",
-    "@polkadot/util": "^0.18.2",
+    "@polkadot/util": "^0.18.4",
     "babel-runtime": "^6.26.0"
   }
 }
diff --git a/packages/api-jsonrpc/src/chain/getHead.js b/packages/api-jsonrpc/src/chain/getHead.js
new file mode 100644
index 000000000000..53e3de130c65
--- /dev/null
+++ b/packages/api-jsonrpc/src/chain/getHead.js
@@ -0,0 +1,20 @@
+// Copyright 2017-2018 Jaco Greeff
+// This software may be modified and distributed under the terms
+// of the ISC license. See the LICENSE file for details.
+// @flow
+
+import type { InterfaceMethodDefinition } from '../types';
+
+/**
+  @name getHead
+  @signature chain_getHead (): HeaderHash
+  @summary Retrieves the best headerHash.
+  @description
+    Return the block hash for the lastest/best.
+*/
+module.exports = ({
+  inputs: [],
+  output: {
+    type: 'HeaderHash'
+  }
+}: InterfaceMethodDefinition);
diff --git a/packages/api-jsonrpc/src/chain/index.js b/packages/api-jsonrpc/src/chain/index.js
index 536612c91172..6f5187406ab8 100644
--- a/packages/api-jsonrpc/src/chain/index.js
+++ b/packages/api-jsonrpc/src/chain/index.js
@@ -5,13 +5,17 @@
 
 import type { InterfaceDefinition } from '../types';
 
+const getHead = require('./getHead');
 const getHeader = require('./getHeader');
+const newHead = require('./newHead');
 
 /**
   @summary Methods to retrieve chain data.
 */
 module.exports = ({
   methods: {
-    getHeader
+    getHead,
+    getHeader,
+    newHead
   }
 }: InterfaceDefinition);
diff --git a/packages/api-jsonrpc/src/chain/newHead.js b/packages/api-jsonrpc/src/chain/newHead.js
new file mode 100644
index 000000000000..7ad16f74bfc6
--- /dev/null
+++ b/packages/api-jsonrpc/src/chain/newHead.js
@@ -0,0 +1,21 @@
+// Copyright 2017-2018 Jaco Greeff
+// This software may be modified and distributed under the terms
+// of the ISC license. See the LICENSE file for details.
+// @flow
+
+import type { InterfaceMethodDefinition } from '../types';
+
+/**
+  @name getHead
+  @signature chain_newHead (): HeaderHash
+  @summary Retrieves the best headerHash via subscription.
+  @description
+    Return the block hash for the lastest/best.
+*/
+module.exports = ({
+  isSubscription: true,
+  inputs: [],
+  output: {
+    type: 'HeaderHash'
+  }
+}: InterfaceMethodDefinition);
diff --git a/packages/api-jsonrpc/src/types.js b/packages/api-jsonrpc/src/types.js
index 465d33365952..9366a367871c 100644
--- a/packages/api-jsonrpc/src/types.js
+++ b/packages/api-jsonrpc/src/types.js
@@ -7,7 +7,7 @@ export type InterfaceTypes = 'author' | 'chain' | 'extra' | 'state';
 
 export type FormatInputType = 'Bytes' | 'H256' | 'HeaderHash' | 'String';
 
-export type FormatOutputType = 'BlockNumber' | 'Bytes' | 'Header' | 'U64';
+export type FormatOutputType = 'BlockNumber' | 'Bytes' | 'Header' | 'HeaderHash' | 'U64';
 
 export type InterfaceInputType = {
   name: string,
@@ -18,8 +18,14 @@ export type InterfaceOutputType = {
   type: FormatOutputType
 };
 
+export type InterfaceMethodDefinition$Subscribe = {
+  subscribe: string,
+  unsubscribe: string
+}
+
 export type InterfaceMethodDefinition = {
-  deprecated?: boolean,
+  isDeprecated?: boolean,
+  isSubscription?: boolean,
   inputs: Array<InterfaceInputType>,
   output: InterfaceOutputType
 };
diff --git a/packages/api-provider/package.json b/packages/api-provider/package.json
index 7f176dd8081f..b6d79b92ac63 100644
--- a/packages/api-provider/package.json
+++ b/packages/api-provider/package.json
@@ -34,7 +34,7 @@
     "nock": "^9.1.0"
   },
   "dependencies": {
-    "@polkadot/util": "^0.18.2",
+    "@polkadot/util": "^0.18.4",
     "babel-runtime": "^6.26.0",
     "isomorphic-fetch": "^2.2.1",
     "websocket": "^1.0.25"
diff --git a/packages/api/package.json b/packages/api/package.json
index 8738b63ee1c1..1ee5d8791185 100644
--- a/packages/api/package.json
+++ b/packages/api/package.json
@@ -33,7 +33,7 @@
     "@polkadot/api-format": "^0.8.6",
     "@polkadot/api-jsonrpc": "^0.8.6",
     "@polkadot/api-provider": "^0.8.6",
-    "@polkadot/util": "^0.18.2",
+    "@polkadot/util": "^0.18.4",
     "babel-runtime": "^6.26.0"
   }
 }
diff --git a/packages/api/src/create/interface.js b/packages/api/src/create/interface.js
index fd2724cd6dad..4fa86076d0fb 100644
--- a/packages/api/src/create/interface.js
+++ b/packages/api/src/create/interface.js
@@ -9,23 +9,23 @@ import type { ApiInterface$Section } from '../types';
 
 const interfaces = require('@polkadot/api-jsonrpc');
 
-const createMethod = require('./method');
-const createSubscribe = require('./subscribe');
+const methodSend = require('./methodSend');
+const methodSubscribe = require('./methodSubscribe');
 
 module.exports = function createInterface (provider: ProviderInterface, section: InterfaceTypes): ApiInterface$Section {
   const exposed: $Shape<ApiInterface$Section> = {};
   const { methods } = interfaces[section];
 
-  exposed.subscribe = createSubscribe(provider, section, methods);
-  exposed.unsubscribe = provider.unsubscribe;
-
   return Object
     .keys(methods)
     .reduce((exposed, name: string) => {
       const rpcName = `${section}_${name}`;
-      const method = createMethod(provider, rpcName, methods[name]);
+      const def = methods[name];
 
-      exposed[name] = method;
+      // flowlint-next-line sketchy-null-bool:off
+      exposed[name] = def.isSubscription
+        ? methodSubscribe(provider, rpcName, name, methods[name])
+        : methodSend(provider, rpcName, name, methods[name]);
 
       return exposed;
     }, exposed);
diff --git a/packages/api/src/create/interface.spec.js b/packages/api/src/create/interface.spec.js
index b42a852820d2..6b8bf445d522 100644
--- a/packages/api/src/create/interface.spec.js
+++ b/packages/api/src/create/interface.spec.js
@@ -16,6 +16,11 @@ jest.mock('./@polkadot/api-jsonrpc', () => ({
       bleh: {
         inputs: [],
         output: { type: 'Address' }
+      },
+      pubsub: {
+        isSubscription: true,
+        inputs: [],
+        output: { type: 'Address' }
       }
     }
   }
@@ -38,7 +43,7 @@ describe('createInterface', () => {
 
   it('adds the specified methods to the interface', () => {
     expect(Object.keys(container)).toEqual(
-      ['subscribe', 'unsubscribe', 'blah', 'bleh']
+      ['blah', 'bleh', 'pubsub']
     );
   });
 
diff --git a/packages/api/src/create/method.js b/packages/api/src/create/methodSend.js
similarity index 66%
rename from packages/api/src/create/method.js
rename to packages/api/src/create/methodSend.js
index 9cd0e2ca3add..0da74ca99474 100644
--- a/packages/api/src/create/method.js
+++ b/packages/api/src/create/methodSend.js
@@ -5,17 +5,17 @@
 
 import type { InterfaceMethodDefinition } from '@polkadot/api-jsonrpc/types';
 import type { ProviderInterface } from '@polkadot/api-provider/types';
+import type { ApiInterface$Section$Method } from '../types';
 
 const formatOutput = require('@polkadot/api-format/output');
 const ExtError = require('@polkadot/util/ext/error');
 const jsonrpcSignature = require('@polkadot/util/jsonrpc/signature');
 
-type Method = (..._params: Array<mixed>) => Promise<mixed>;
-
 const createParams = require('./params');
 
-module.exports = function createMethod (provider: ProviderInterface, rpcName: string, { inputs, output }: InterfaceMethodDefinition): Method {
-  return async (..._params: Array<mixed>): Promise<mixed> => {
+module.exports = function createMethodSend (provider: ProviderInterface, rpcName: string, name: string, { inputs, output }: InterfaceMethodDefinition): ApiInterface$Section$Method {
+  const call = async (..._params: Array<mixed>): Promise<mixed> => {
+    // TODO: Deprecated warning
     try {
       const params = createParams(rpcName, _params, inputs);
       const result = await provider.send(rpcName, params);
@@ -25,4 +25,7 @@ module.exports = function createMethod (provider: ProviderInterface, rpcName: st
       throw new ExtError(`${jsonrpcSignature(rpcName, inputs, output)}:: ${error.message}`, (error: ExtError).code);
     }
   };
+
+  // flowlint-next-line unclear-type:off
+  return ((call: any): ApiInterface$Section$Method);
 };
diff --git a/packages/api/src/create/method.spec.js b/packages/api/src/create/methodSend.spec.js
similarity index 78%
rename from packages/api/src/create/method.spec.js
rename to packages/api/src/create/methodSend.spec.js
index 616432695556..426361a31045 100644
--- a/packages/api/src/create/method.spec.js
+++ b/packages/api/src/create/methodSend.spec.js
@@ -2,9 +2,9 @@
 // This software may be modified and distributed under the terms
 // of the ISC license. See the LICENSE file for details.
 
-const createMethod = require('./method');
+const createMethod = require('./methodSend');
 
-describe('createMethod', () => {
+describe('methodCall', () => {
   let methods;
   let provider;
 
@@ -30,7 +30,7 @@ describe('createMethod', () => {
   });
 
   it('wraps errors with the call signature', () => {
-    const method = createMethod(provider, 'test_blah', methods.blah);
+    const method = createMethod(provider, 'test_blah', 'blah', methods.blah);
 
     return method().catch((error) => {
       expect(error.message).toMatch(/test_blah \(foo: Bytes\): Bytes/);
@@ -38,7 +38,7 @@ describe('createMethod', () => {
   });
 
   it('checks for mismatched parameters', () => {
-    const method = createMethod(provider, 'test_bleh', methods.bleh);
+    const method = createMethod(provider, 'test_bleh', 'bleh', methods.bleh);
 
     return method(1).catch((error) => {
       expect(error.message).toMatch(/0 params expected, found 1 instead/);
@@ -46,7 +46,7 @@ describe('createMethod', () => {
   });
 
   it('calls the provider with the correct parameters', () => {
-    const method = createMethod(provider, 'test_blah', methods.blah);
+    const method = createMethod(provider, 'test_blah', 'blah', methods.blah);
 
     return method(new Uint8Array([0x12, 0x34])).then(() => {
       expect(provider.send).toHaveBeenCalledWith('test_blah', ['0x1234']);
diff --git a/packages/api/src/create/subscribeMethod.js b/packages/api/src/create/methodSubscribe.js
similarity index 65%
rename from packages/api/src/create/subscribeMethod.js
rename to packages/api/src/create/methodSubscribe.js
index 385a67512767..9171293d672f 100644
--- a/packages/api/src/create/subscribeMethod.js
+++ b/packages/api/src/create/methodSubscribe.js
@@ -5,6 +5,7 @@
 
 import type { InterfaceMethodDefinition } from '@polkadot/api-jsonrpc/types';
 import type { ProviderInterface, ProviderInterface$Callback } from '@polkadot/api-provider/types';
+import type { ApiInterface$Section$Method } from '../types';
 
 const formatOutput = require('@polkadot/api-format/output');
 const assert = require('@polkadot/util/assert');
@@ -12,12 +13,12 @@ const ExtError = require('@polkadot/util/ext/error');
 const isFunction = require('@polkadot/util/is/function');
 const jsonrpcSignature = require('@polkadot/util/jsonrpc/signature');
 
-type Method = (...params: Array<mixed>) => Promise<number>;
-
 const createParams = require('./params');
 
-module.exports = function createSubscribeMethod (provider: ProviderInterface, rpcName: string, { inputs, output }: InterfaceMethodDefinition): Method {
-  return async (..._params: Array<mixed>): Promise<number> => {
+module.exports = function methodSubscribe (provider: ProviderInterface, rpcName: string, name: string, { inputs, output }: InterfaceMethodDefinition): ApiInterface$Section$Method {
+  const unsubscribe = (subscriptionId: mixed): Promise<mixed> =>
+    provider.send(`unsubscribe_${name}`, [subscriptionId]);
+  const call = async (..._params: Array<mixed>): Promise<mixed> => {
     try {
       // flowlint-next-line unclear-type:off
       const cb = ((_params.pop(): any): ProviderInterface$Callback);
@@ -26,7 +27,7 @@ module.exports = function createSubscribeMethod (provider: ProviderInterface, rp
 
       const params = createParams(rpcName, _params, inputs);
 
-      return provider.subscribe(rpcName, params, (error: ?Error, result: mixed) => {
+      return provider.subscribe(`subscribe_${name}`, params, (error: ?Error, result: mixed) => {
         if (error) {
           cb(error);
         } else {
@@ -37,4 +38,9 @@ module.exports = function createSubscribeMethod (provider: ProviderInterface, rp
       throw new ExtError(`${jsonrpcSignature(rpcName, inputs, output)}:: ${error.message}`, (error: ExtError).code);
     }
   };
+
+  call.unsubscribe = unsubscribe;
+
+  // flowlint-next-line unclear-type:off
+  return ((call: any): ApiInterface$Section$Method);
 };
diff --git a/packages/api/src/create/subscribe.js b/packages/api/src/create/subscribe.js
deleted file mode 100644
index 25d39306536b..000000000000
--- a/packages/api/src/create/subscribe.js
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2017-2018 Jaco Greeff
-// This software may be modified and distributed under the terms
-// of the ISC license. See the LICENSE file for details.
-// @flow
-
-import type { InterfaceDefinition$Methods } from '@polkadot/api-jsonrpc/types';
-import type { ProviderInterface } from '@polkadot/api-provider/types';
-
-const assert = require('@polkadot/util/assert');
-
-type Method = (name: string, ...params: Array<mixed>) => Promise<number>;
-
-const subscribeMethod = require('./subscribeMethod');
-
-module.exports = function createSubscribe (provider: ProviderInterface, section: string, methods: InterfaceDefinition$Methods): Method {
-  return async (name: string, ...params: Array<mixed>): Promise<number> => {
-    const rpcName = `${section}_${name}`;
-
-    assert(methods[name], `Unable to find '${rpcName}' subscription`);
-
-    const fn = subscribeMethod(provider, rpcName, methods[name]);
-
-    return fn.apply(null, params);
-  };
-};
diff --git a/packages/api/src/create/subscribe.spec.js b/packages/api/src/create/subscribe.spec.js
deleted file mode 100644
index 3f8a435268f0..000000000000
--- a/packages/api/src/create/subscribe.spec.js
+++ /dev/null
@@ -1,76 +0,0 @@
-// Copyright 2017-2018 Jaco Greeff
-// This software may be modified and distributed under the terms
-// of the ISC license. See the LICENSE file for details.
-
-const createSubscribe = require('./subscribe');
-
-describe('createSubscribe', () => {
-  let methods;
-  let provider;
-  let sub;
-  let cb;
-
-  beforeEach(() => {
-    methods = {
-      blah: {
-        inputs: [
-          { name: 'foo', type: 'Address' }
-        ],
-        output: { type: 'Address' }
-      },
-      bleh: {
-        inputs: [],
-        output: { type: 'Address' }
-      }
-    };
-
-    provider = {
-      subscribe: jest.fn((method, params, _cb) => {
-        cb = _cb;
-
-        return Promise.resolve(12345);
-      }),
-      unsubscribe: jest.fn(() => {
-        return Promise.resolve(true);
-      })
-    };
-
-    sub = createSubscribe(provider, 'test', methods);
-  });
-
-  it('it does not subscribe to not-found endpoint', () => {
-    return sub('notFound').catch((error) => {
-      expect(error.message).toMatch(/Unable to find 'test_notFound' subscription/);
-    });
-  });
-
-  it('returns the subscription', () => {
-    return sub('bleh', () => true).then((id) => {
-      expect(id).toEqual(12345);
-    });
-  });
-
-  it('returns values as they are available', (done) => {
-    sub('bleh', () => {
-      done();
-    });
-
-    cb(null, '0x123');
-  });
-
-  it('returns errors as they are available', (done) => {
-    sub('bleh', (error) => {
-      expect(error.message).toEqual('test error');
-
-      done();
-    });
-
-    cb(new Error('test error'));
-  });
-
-  it('checks that valid callback is provided', () => {
-    return sub('bleh').catch((error) => {
-      expect(error.message).toMatch(/Expected callback in last position/);
-    });
-  });
-});
diff --git a/packages/api/src/types.js b/packages/api/src/types.js
index 2e4bdafbd71b..f7bf5995b167 100644
--- a/packages/api/src/types.js
+++ b/packages/api/src/types.js
@@ -5,13 +5,13 @@
 
 import type { InterfaceTypes } from '@polkadot/api-jsonrpc/types';
 
-export type ApiInterface$Section$Method = (...params: Array<mixed>) => Promise<mixed>;
+export type ApiInterface$Section$Method = {
+  (...params: Array<mixed>): Promise<mixed>;
+  unsubscribe: (id: number) => Promise<mixed>;
+}
 
 export type ApiInterface$Section = {
-  [string]: ApiInterface$Section$Method,
-
-  subscribe: (name: string, ...params: Array<mixed>) => Promise<number>,
-  unsubscribe: (id: number) => Promise<boolean>
+  [string]: ApiInterface$Section$Method
 };
 
 export type ApiInterface = {
diff --git a/yarn.lock b/yarn.lock
index a4e65bf8a069..3bcfed7a0baf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -209,9 +209,9 @@
     deasync "^0.1.12"
     ip-regex "^2.1.0"
 
-"@polkadot/util@^0.18.2":
-  version "0.18.2"
-  resolved "https://registry.yarnpkg.com/@polkadot/util/-/util-0.18.2.tgz#a00fc2c27e63f9ed1b297eb9109db97234677194"
+"@polkadot/util@^0.18.4":
+  version "0.18.4"
+  resolved "https://registry.yarnpkg.com/@polkadot/util/-/util-0.18.4.tgz#b1886a3d4663d302fe1234705f506fae95b371b8"
   dependencies:
     babel-runtime "^6.26.0"
     bn.js "^4.11.8"