diff --git a/packages/rpc-core/test/e2e/krummelanke.test.js b/packages/rpc-core/test/e2e/alexander.test.ts
similarity index 55%
rename from packages/rpc-core/test/e2e/krummelanke.test.js
rename to packages/rpc-core/test/e2e/alexander.test.ts
index 66caeb96e2..fff492aa67 100644
--- a/packages/rpc-core/test/e2e/krummelanke.test.js
+++ b/packages/rpc-core/test/e2e/alexander.test.ts
@@ -2,43 +2,50 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-import storage from '@polkadot/storage';
+import { BlockNumber, Index, SignedBlock, StorageChangeSet } from '@polkadot/types';
+import storage from '@polkadot/storage/static';
 import WsProvider from '@polkadot/rpc-provider/ws';
 
 import Rpc from '../../src';
 
-describe.skip('e2e krumme lanke', () => {
-  let api;
+const randomAccount = '5HTqyWJHAVUieZnpb1V8gK4T1E4mnhkrUVSSzWBQd6kYgsVJ';
+
+describe.skip('e2e Alexander - Polkadot', () => {
+  let api: Rpc;
 
   beforeEach(() => {
     jest.setTimeout(30000);
-    api = new Rpc(new WsProvider('ws://127.0.0.1:9944'));
+    api = new Rpc(new WsProvider('wss://poc3-rpc.polkadot.io/'));
   });
 
   it('subscribes to storage', (done) => {
-    api.state
+    return (
+      api.state
       .subscribeStorage(
         [
-          [storage.system.accountNonce, '5Ejbye9R8ygByQPrDSasaUid1munedPZUmg4f118HGmtodGp'],
-          [storage.balances.freeBalance, '5DTestUPts3kjeXSTMyerHihn1uwMfLj8vU8sqF7qYrFacT7']
+          [storage.system.accountNonce, randomAccount],
+          [storage.session.currentIndex]
         ],
-        (data) => {
+        (data: StorageChangeSet) => {
           expect(data).toHaveLength(2);
-          expect(data[0].toNumber()).toEqual(0);
-          expect(data[1].toNumber()).not.toEqual(0);
+          expect(data).toEqual(
+            expect.arrayContaining([
+              expect.any(BlockNumber),
+              expect.any(Index)
+            ])
+          );
 
           done();
-        }
-      )
-      .then((subscriptionId) => {
-        console.log('stoarge subscriptionId =', subscriptionId);
-      });
+        }).then((subscriptionId: number) => {
+          console.log('stoarge subscriptionId =', subscriptionId);
+        })
+    );
   });
 
   it('retrieves a block by hash (krumme lanke #1)', () => {
     return api.chain
       .getBlock('0x627847bffdf5f3e01ac440d057dec6a37a12a6f329db7ef8367665574b76b5df')
-      .then((block) => {
+      .then((block: SignedBlock) => {
         expect(block).toBeDefined();
       })
       .catch((error) => {
@@ -51,7 +58,7 @@ describe.skip('e2e krumme lanke', () => {
   it('retrieves a block by hash (krumme lanke #2)', () => {
     return api.chain
       .getBlock('0x53416d53a4b1dfcae9165a89d193608e4aa770414f02267f5b2c4015a2e66091')
-      .then((block) => {
+      .then((block: SignedBlock) => {
         expect(block).toBeDefined();
       })
       .catch((error) => {
diff --git a/packages/rpc-core/test/e2e/basics.test.js b/packages/rpc-core/test/e2e/basics.test.ts
similarity index 75%
rename from packages/rpc-core/test/e2e/basics.test.js
rename to packages/rpc-core/test/e2e/basics.test.ts
index 9d14fd1e33..66eaf629f0 100644
--- a/packages/rpc-core/test/e2e/basics.test.js
+++ b/packages/rpc-core/test/e2e/basics.test.ts
@@ -2,12 +2,13 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
+import { ChainProperties, PendingExtrinsics } from '@polkadot/types';
 import WsProvider from '@polkadot/rpc-provider/ws';
 
 import Rpc from '../../src';
 
 describe.skip('e2e basics', () => {
-  let api;
+  let api: Rpc;
 
   beforeEach(() => {
     jest.setTimeout(30000);
@@ -17,8 +18,8 @@ describe.skip('e2e basics', () => {
   it('retrieves the pending extrinsics', () => {
     return api.author
       .pendingExtrinsics()
-      .then((extrinsics) => {
-        console.error('extrinsics', extrinsics);
+      .then((extrinsics: PendingExtrinsics) => {
+        console.log('extrinsics', extrinsics);
       })
       .catch((error) => {
         console.error(error);
@@ -30,8 +31,8 @@ describe.skip('e2e basics', () => {
   it('retrieves the system properties', () => {
     return api.system
       .properties()
-      .then((properties) => {
-        console.error('properties', properties);
+      .then((properties: ChainProperties) => {
+        console.log('properties', properties);
       })
       .catch((error) => {
         console.error(error);
diff --git a/packages/rpc-core/test/e2e/chain.test.js b/packages/rpc-core/test/e2e/chain.test.ts
similarity index 80%
rename from packages/rpc-core/test/e2e/chain.test.js
rename to packages/rpc-core/test/e2e/chain.test.ts
index 14e9d7fa1f..8b65e49bc0 100644
--- a/packages/rpc-core/test/e2e/chain.test.js
+++ b/packages/rpc-core/test/e2e/chain.test.ts
@@ -2,12 +2,13 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
+import { Header, RuntimeVersion } from '@polkadot/types';
 import WsProvider from '@polkadot/rpc-provider/ws';
 
 import Rpc from '../../src';
 
 describe.skip('e2e chain', () => {
-  let api;
+  let api: Rpc;
 
   beforeEach(() => {
     jest.setTimeout(30000);
@@ -15,18 +16,18 @@ describe.skip('e2e chain', () => {
   });
 
   it('subscribes via subscribeNewHead', (done) => {
-    let count = 0;
+    let count: number = 0;
 
     // tslint:disable-next-line
     api.chain
-      .subscribeNewHead((header) => {
+      .subscribeNewHead((header: Header) => {
         expect(header).toBeDefined();
 
         if (++count === 3) {
           done();
         }
       })
-      .then((subscriptionId) => {
+      .then((subscriptionId: number) => {
         console.log('newHead: subscriptionId =', subscriptionId);
       });
   });
@@ -34,7 +35,7 @@ describe.skip('e2e chain', () => {
   it('retrieves the runtime version', () => {
     return api.chain
       .getRuntimeVersion()
-      .then((version) => {
+      .then((version: RuntimeVersion) => {
         console.error('version', version);
       })
       .catch((error) => {
diff --git a/packages/rpc-core/test/e2e/state.test.js b/packages/rpc-core/test/e2e/state.test.ts
similarity index 85%
rename from packages/rpc-core/test/e2e/state.test.js
rename to packages/rpc-core/test/e2e/state.test.ts
index 06e095f175..4ec7ade4fe 100644
--- a/packages/rpc-core/test/e2e/state.test.js
+++ b/packages/rpc-core/test/e2e/state.test.ts
@@ -2,14 +2,16 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
+import { Balance, Bytes, Metadata, Moment } from '@polkadot/types';
 import storage from '@polkadot/storage/static';
+import WsProvider from '@polkadot/rpc-provider/ws';
 
 import Rpc from '../../src';
 
 const ALICE = '5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY';
 
 describe.skip('e2e state', () => {
-  let api;
+  let api: Rpc;
 
   beforeEach(() => {
     jest.setTimeout(30000);
@@ -21,7 +23,7 @@ describe.skip('e2e state', () => {
       .getStorage([
         storage.substrate.code
       ])
-      .then((code) => {
+      .then((code: Bytes) => {
         console.error(code.toHex().substr(0, 256), '...');
       })
       .catch((error) => {
@@ -34,7 +36,7 @@ describe.skip('e2e state', () => {
   it('retrieves the wasm metadata', () => {
     return api.state
       .getMetadata()
-      .then((meta) => {
+      .then((meta: Metadata) => {
         console.error(JSON.stringify(meta.toJSON()));
       })
       .catch((error) => {
@@ -49,7 +51,7 @@ describe.skip('e2e state', () => {
       .getStorage([
         storage.balances.freeBalance, ALICE
       ])
-      .then((balance) => {
+      .then((balance: Balance) => {
         console.error(balance);
 
         expect(balance.isZero()).not.toEqual(true);
@@ -66,7 +68,7 @@ describe.skip('e2e state', () => {
       .getStorage([
         storage.timestamp.now
       ])
-      .then((moment) => {
+      .then((moment: Moment) => {
         console.error(moment);
 
         expect(moment.toNumber()).not.toEqual(0);
diff --git a/packages/rpc-core/test/e2e/subscribe.test.js b/packages/rpc-core/test/e2e/subscribe.test.ts
similarity index 77%
rename from packages/rpc-core/test/e2e/subscribe.test.js
rename to packages/rpc-core/test/e2e/subscribe.test.ts
index efbdfd21d9..07e216a678 100644
--- a/packages/rpc-core/test/e2e/subscribe.test.js
+++ b/packages/rpc-core/test/e2e/subscribe.test.ts
@@ -2,13 +2,14 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
+import { StorageChangeSet } from '@polkadot/types';
 import WsProvider from '@polkadot/rpc-provider/ws';
 import storage from '@polkadot/storage/static';
 
 import Rpc from '../../src';
 
 describe.skip('e2e subscriptions', () => {
-  let api;
+  let api: Rpc;
 
   beforeEach(() => {
     jest.setTimeout(30000);
@@ -16,17 +17,17 @@ describe.skip('e2e subscriptions', () => {
   });
 
   it('retrieves current timestamp', (done) => {
-    let count = 0;
+    let count: number = 0;
 
     return api.state
-      .subscribeStorage([[storage.timestamp.now]], (data) => {
+      .subscribeStorage([[storage.timestamp.now]], (data: StorageChangeSet) => {
         expect(data).toBeDefined();
 
         if (++count === 3) {
           done();
         }
       })
-      .then((subscriptionId) => {
+      .then((subscriptionId: number) => {
         console.log('newHead: subscriptionId =', subscriptionId);
       });
   });