diff --git a/package.json b/package.json
index 41b18f6965..42dfe5e61e 100644
--- a/package.json
+++ b/package.json
@@ -12,15 +12,15 @@
     "packages/*"
   ],
   "resolutions": {
-    "@polkadot/api": "^3.4.2-1",
-    "@polkadot/api-contract": "^3.4.2-1",
+    "@polkadot/api": "^3.4.2-3",
+    "@polkadot/api-contract": "^3.4.2-3",
     "@polkadot/keyring": "^5.2.3",
     "@polkadot/networks": "^5.2.3",
-    "@polkadot/types": "^3.4.2-1",
+    "@polkadot/types": "^3.4.2-3",
     "@polkadot/util": "^5.2.3",
     "@polkadot/util-crypto": "^5.2.3",
     "@polkadot/wasm-crypto": "^3.1.1",
-    "@polkadot/x-rxjs": "^3.4.2-1",
+    "@polkadot/x-rxjs": "^3.4.2-3",
     "babel-core": "^7.0.0-bridge.0",
     "styled-components": "^5.2.0",
     "typescript": "^4.1.3"
diff --git a/packages/page-accounts/src/modals/IdentitySub.tsx b/packages/page-accounts/src/modals/IdentitySub.tsx
index f5845d3e21..543d85e5e3 100644
--- a/packages/page-accounts/src/modals/IdentitySub.tsx
+++ b/packages/page-accounts/src/modals/IdentitySub.tsx
@@ -1,6 +1,7 @@
 // Copyright 2017-2021 @polkadot/app-accounts authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
+import type { TFunction } from 'i18next';
 import type { Data, Option, Vec } from '@polkadot/types';
 import type { AccountId, Balance } from '@polkadot/types/interfaces';
 import type { ITuple } from '@polkadot/types/types';
@@ -25,7 +26,7 @@ interface SubProps {
   name: string;
   setAddress: (index: number, value: string) => void;
   setName: (index: number, value: string) => void;
-  t: (key: string, opts?: { replace: Record<string, string | number> }) => string;
+  t: TFunction;
 }
 
 function extractInfo ([[ids], opts]: [[string[]], Option<ITuple<[AccountId, Data]>>[]]): [string, string][] {
@@ -60,7 +61,7 @@ function IdentitySub ({ address, index, name, setAddress, setName, t }: SubProps
       <Columar.Column>
         <InputAddress
           defaultValue={address}
-          label={t('address {{index}}', { replace: { index: index + 1 } })}
+          label={t<string>('address {{index}}', { replace: { index: index + 1 } })}
           onChange={_setAddress}
         />
       </Columar.Column>
@@ -69,7 +70,7 @@ function IdentitySub ({ address, index, name, setAddress, setName, t }: SubProps
           defaultValue={name}
           isError={!name}
           isFull
-          label={t('sub name')}
+          label={t<string>('sub name')}
           onChange={_setName}
         />
       </Columar.Column>
diff --git a/packages/page-contracts/package.json b/packages/page-contracts/package.json
index 9bd7e23b3c..90b101253d 100644
--- a/packages/page-contracts/package.json
+++ b/packages/page-contracts/package.json
@@ -10,6 +10,6 @@
   "license": "Apache-2.0",
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "@polkadot/api-contract": "^3.4.2-1"
+    "@polkadot/api-contract": "^3.4.2-3"
   }
 }
diff --git a/packages/page-parachains/src/Overview/Actions.tsx b/packages/page-parachains/src/Overview/Actions.tsx
index 2f3fa98be3..8d2f95fb33 100644
--- a/packages/page-parachains/src/Overview/Actions.tsx
+++ b/packages/page-parachains/src/Overview/Actions.tsx
@@ -4,7 +4,7 @@
 import React from 'react';
 
 import { Button } from '@polkadot/react-components';
-import { useApi, useToggle } from '@polkadot/react-hooks';
+import { useAccounts, useApi, useToggle } from '@polkadot/react-hooks';
 
 import Propose from '../modals/Propose';
 import { useTranslation } from '../translate';
@@ -16,6 +16,7 @@ interface Props {
 function Actions (): React.ReactElement<Props> {
   const { t } = useTranslation();
   const { api } = useApi();
+  const { hasAccounts } = useAccounts();
   const [showPropose, togglePropose] = useToggle();
 
   return (
@@ -24,7 +25,7 @@ function Actions (): React.ReactElement<Props> {
         {api.query.proposeParachain && (
           <Button
             icon='plus'
-            isDisabled={true}
+            isDisabled={!hasAccounts}
             label={t<string>('Propose')}
             onClick={togglePropose}
           />
diff --git a/packages/page-parachains/src/Overview/index.tsx b/packages/page-parachains/src/Overview/index.tsx
index a33066f35b..f7bcfa9953 100644
--- a/packages/page-parachains/src/Overview/index.tsx
+++ b/packages/page-parachains/src/Overview/index.tsx
@@ -38,7 +38,7 @@ function Overview (): React.ReactElement<Props> {
           <Upcoming ids={upcomingIds} />
         </>
       )}
-      {api.query.parachainProposals && (
+      {api.query.proposeParachain && (
         <Proposals proposals={proposals} />
       )}
     </>
diff --git a/packages/page-parachains/src/modals/Propose.tsx b/packages/page-parachains/src/modals/Propose.tsx
index 49ad3cbc66..7b5130b5bb 100644
--- a/packages/page-parachains/src/modals/Propose.tsx
+++ b/packages/page-parachains/src/modals/Propose.tsx
@@ -1,11 +1,14 @@
 // Copyright 2017-2021 @polkadot/app-parachains authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
+import type { TFunction } from 'i18next';
+
+import BN from 'bn.js';
 import React, { useCallback, useState } from 'react';
 
-import { InputAddress, InputFile, InputNumber, InputWasm, Modal, TxButton } from '@polkadot/react-components';
+import { Button, Input, InputAddress, InputBalance, InputFile, InputNumber, InputWasm, MarkWarning, Modal, TxButton } from '@polkadot/react-components';
 import { useApi } from '@polkadot/react-hooks';
-import { BN_ZERO, compactAddLength } from '@polkadot/util';
+import { BN_TEN, compactAddLength } from '@polkadot/util';
 
 import { useTranslation } from '../translate';
 
@@ -19,11 +22,36 @@ interface CodeState {
   wasm: Uint8Array | null;
 }
 
+interface ValidatorProps {
+  address: string;
+  index: number;
+  setAddress: (index: number, value: string) => void;
+  t: TFunction;
+}
+
+function Validator ({ address, index, setAddress, t }: ValidatorProps): React.ReactElement<ValidatorProps> {
+  const _setAddress = useCallback(
+    (value: string | null) => value && setAddress(index, value),
+    [index, setAddress]
+  );
+
+  return (
+    <InputAddress
+      defaultValue={address}
+      label={t('validator {{index}}', { replace: { index: index + 1 } })}
+      onChange={_setAddress}
+    />
+  );
+}
+
 function Propose ({ className, onClose }: Props): React.ReactElement<Props> {
   const { t } = useTranslation();
   const { api } = useApi();
   const [accountId, setAccountId] = useState<string | null>(null);
-  const [paraId, setParaId] = useState(BN_ZERO);
+  const [name, setName] = useState('');
+  const [paraId, setParaId] = useState(new BN(Date.now() % 131072));
+  const [balance, setBalance] = useState(new BN(1000).mul(BN_TEN.pow(new BN(api.registry.chainDecimals))));
+  const [validators, setValidators] = useState<string[]>(['']);
   const [{ isWasmValid, wasm }, setWasm] = useState<CodeState>({ isWasmValid: false, wasm: null });
   const [genesisState, setGenesisState] = useState<Uint8Array | null>(null);
 
@@ -37,16 +65,35 @@ function Propose ({ className, onClose }: Props): React.ReactElement<Props> {
     []
   );
 
+  const _setAddress = useCallback(
+    (index: number, address: string) =>
+      setValidators((v) => v.map((v, i) => i === index ? address : v)),
+    []
+  );
+
+  const _addValidator = useCallback(
+    () => setValidators((v) => [...v, '']),
+    []
+  );
+
+  const _delValidator = useCallback(
+    () => setValidators((v) => [...v.slice(0, v.length - 1)]),
+    []
+  );
+
+  const isNameValid = name.length >= 3;
+
   return (
     <Modal
       className={className}
-      header={t<string>('Register parachain')}
+      header={t<string>('Propose parachain')}
+      size='large'
     >
       <Modal.Content>
         <Modal.Columns>
           <Modal.Column>
             <InputAddress
-              label={t<string>('register from')}
+              label={t<string>('propose from')}
               onChange={setAccountId}
               type='account'
               value={accountId}
@@ -56,9 +103,22 @@ function Propose ({ className, onClose }: Props): React.ReactElement<Props> {
             <p>{t<string>('This account will be associated with the parachain and pay the deposit.')}</p>
           </Modal.Column>
         </Modal.Columns>
+        <Modal.Columns>
+          <Modal.Column>
+            <Input
+              isError={!isNameValid}
+              label={t<string>('name')}
+              onChange={setName}
+            />
+          </Modal.Column>
+          <Modal.Column>
+            <p>{t<string>('The name for this parachain')}</p>
+          </Modal.Column>
+        </Modal.Columns>
         <Modal.Columns>
           <Modal.Column>
             <InputNumber
+              defaultValue={paraId.toString()}
               label={t<string>('parachain id')}
               onChange={setParaId}
             />
@@ -98,15 +158,59 @@ function Propose ({ className, onClose }: Props): React.ReactElement<Props> {
             <p>{t<string>('The genesis state for this parachain.')}</p>
           </Modal.Column>
         </Modal.Columns>
+        <Modal.Columns>
+          <Modal.Column>
+            {validators.map((address, index) => (
+              <Validator
+                address={address}
+                index={index}
+                key={index}
+                setAddress={_setAddress}
+                t={t}
+              />
+            ))}
+            {!validators.length && (
+              <MarkWarning content={t<string>('You need to supply at last one running validator for your parachain alongside this request.')} />
+            )}
+            <Button.Group>
+              <Button
+                icon='plus'
+                label={t<string>('Add validator')}
+                onClick={_addValidator}
+              />
+              <Button
+                icon='minus'
+                isDisabled={validators.length === 0}
+                label={t<string>('Remove validator')}
+                onClick={_delValidator}
+              />
+            </Button.Group>
+          </Modal.Column>
+          <Modal.Column>
+            <p>{t<string>('The validators for this parachain')}</p>
+          </Modal.Column>
+        </Modal.Columns>
+        <Modal.Columns>
+          <Modal.Column>
+            <InputBalance
+              defaultValue={balance}
+              label={t<string>('initial balance')}
+              onChange={setBalance}
+            />
+          </Modal.Column>
+          <Modal.Column>
+            <p>{t<string>('The proposed initial balance for this parachain')}</p>
+          </Modal.Column>
+        </Modal.Columns>
       </Modal.Content>
       <Modal.Actions onCancel={onClose}>
         <TxButton
           accountId={accountId}
           icon='plus'
-          isDisabled={!isWasmValid || !genesisState}
+          isDisabled={!isWasmValid || !genesisState || !isNameValid || !validators.length}
           onStart={onClose}
-          params={[paraId, genesisState, wasm]}
-          tx={api.tx.registrar.registerParathread}
+          params={[paraId, name, wasm, genesisState, validators, balance]}
+          tx={api.tx.proposeParachain?.proposeParachain}
         />
       </Modal.Actions>
     </Modal>
diff --git a/packages/page-parachains/src/modals/RegisterThread.tsx b/packages/page-parachains/src/modals/RegisterThread.tsx
new file mode 100644
index 0000000000..ebafe1b09a
--- /dev/null
+++ b/packages/page-parachains/src/modals/RegisterThread.tsx
@@ -0,0 +1,116 @@
+// Copyright 2017-2021 @polkadot/app-parachains authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import React, { useCallback, useState } from 'react';
+
+import { InputAddress, InputFile, InputNumber, InputWasm, Modal, TxButton } from '@polkadot/react-components';
+import { useApi } from '@polkadot/react-hooks';
+import { BN_ZERO, compactAddLength } from '@polkadot/util';
+
+import { useTranslation } from '../translate';
+
+interface Props {
+  className?: string;
+  onClose: () => void;
+}
+
+interface CodeState {
+  isWasmValid: boolean;
+  wasm: Uint8Array | null;
+}
+
+function RegisterThread ({ className, onClose }: Props): React.ReactElement<Props> {
+  const { t } = useTranslation();
+  const { api } = useApi();
+  const [accountId, setAccountId] = useState<string | null>(null);
+  const [paraId, setParaId] = useState(BN_ZERO);
+  const [{ isWasmValid, wasm }, setWasm] = useState<CodeState>({ isWasmValid: false, wasm: null });
+  const [genesisState, setGenesisState] = useState<Uint8Array | null>(null);
+
+  const _setGenesisState = useCallback(
+    (data: Uint8Array) => setGenesisState(compactAddLength(data)),
+    []
+  );
+
+  const _setWasm = useCallback(
+    (wasm: Uint8Array, isWasmValid: boolean) => setWasm({ isWasmValid, wasm }),
+    []
+  );
+
+  return (
+    <Modal
+      className={className}
+      header={t<string>('Register parathread')}
+    >
+      <Modal.Content>
+        <Modal.Columns>
+          <Modal.Column>
+            <InputAddress
+              label={t<string>('register from')}
+              onChange={setAccountId}
+              type='account'
+              value={accountId}
+            />
+          </Modal.Column>
+          <Modal.Column>
+            <p>{t<string>('This account will be associated with the parachain and pay the deposit.')}</p>
+          </Modal.Column>
+        </Modal.Columns>
+        <Modal.Columns>
+          <Modal.Column>
+            <InputNumber
+              label={t<string>('parachain id')}
+              onChange={setParaId}
+            />
+          </Modal.Column>
+          <Modal.Column>
+            <p>{t<string>('The id of this parachain as known on the network')}</p>
+          </Modal.Column>
+        </Modal.Columns>
+        <Modal.Columns>
+          <Modal.Column>
+            <InputWasm
+              help={t<string>('The compiled runtime WASM for the parachain you wish to register.')}
+              isError={!isWasmValid}
+              label={t<string>('code')}
+              onChange={_setWasm}
+              placeholder={
+                wasm && !isWasmValid
+                  ? t<string>('The code is not recognized as being in valid WASM format')
+                  : null
+              }
+            />
+          </Modal.Column>
+          <Modal.Column>
+            <p>{t<string>('The WASM validation function for this parachain.')}</p>
+          </Modal.Column>
+        </Modal.Columns>
+        <Modal.Columns>
+          <Modal.Column>
+            <InputFile
+              help={t<string>('The genesis state for the parachain.')}
+              isError={!genesisState}
+              label={t<string>('initial state')}
+              onChange={_setGenesisState}
+            />
+          </Modal.Column>
+          <Modal.Column>
+            <p>{t<string>('The genesis state for this parachain.')}</p>
+          </Modal.Column>
+        </Modal.Columns>
+      </Modal.Content>
+      <Modal.Actions onCancel={onClose}>
+        <TxButton
+          accountId={accountId}
+          icon='plus'
+          isDisabled={!isWasmValid || !genesisState}
+          onStart={onClose}
+          params={[paraId, genesisState, wasm]}
+          tx={api.tx.registrar.registerParathread}
+        />
+      </Modal.Actions>
+    </Modal>
+  );
+}
+
+export default React.memo(RegisterThread);
diff --git a/packages/react-api/package.json b/packages/react-api/package.json
index c14c1e1abe..f93638e80b 100644
--- a/packages/react-api/package.json
+++ b/packages/react-api/package.json
@@ -15,9 +15,9 @@
   "homepage": "https://github.com/polkadot-js/apps/tree/master/packages/react-api#readme",
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "@polkadot/api": "^3.4.2-1",
+    "@polkadot/api": "^3.4.2-3",
     "@polkadot/extension-dapp": "^0.36.2-1",
-    "@polkadot/x-rxjs": "^3.4.2-1",
+    "@polkadot/x-rxjs": "^3.4.2-3",
     "fflate": "^0.4.8"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 7ac3189794..d13100e7fa 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1908,54 +1908,54 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@polkadot/api-contract@npm:^3.4.2-1":
-  version: 3.4.2-1
-  resolution: "@polkadot/api-contract@npm:3.4.2-1"
+"@polkadot/api-contract@npm:^3.4.2-3":
+  version: 3.4.2-3
+  resolution: "@polkadot/api-contract@npm:3.4.2-3"
   dependencies:
     "@babel/runtime": ^7.12.5
-    "@polkadot/api": 3.4.2-1
-    "@polkadot/types": 3.4.2-1
+    "@polkadot/api": 3.4.2-3
+    "@polkadot/types": 3.4.2-3
     "@polkadot/util": ^5.2.3
-    "@polkadot/x-rxjs": 3.4.2-1
+    "@polkadot/x-rxjs": 3.4.2-3
     bn.js: ^4.11.9
-  checksum: 44bad7710d00e86323c0b1371d735bb127a4f634faa573497b9e52ce44de20268b07170e66fb689a39a2ba8bdaf41a0c1248ac295be381cadd88b3b3353beb6c
+  checksum: 03f696bcbd1bb522d93b475536065618ff25dd1754e6c584ce54a5a83631c69f930fdc3acad51ddd5ec9635b8c9650df85878d3f66d8e0dfa62a930feb2f0d92
   languageName: node
   linkType: hard
 
-"@polkadot/api-derive@npm:3.4.2-1":
-  version: 3.4.2-1
-  resolution: "@polkadot/api-derive@npm:3.4.2-1"
+"@polkadot/api-derive@npm:3.4.2-3":
+  version: 3.4.2-3
+  resolution: "@polkadot/api-derive@npm:3.4.2-3"
   dependencies:
     "@babel/runtime": ^7.12.5
-    "@polkadot/api": 3.4.2-1
-    "@polkadot/rpc-core": 3.4.2-1
-    "@polkadot/types": 3.4.2-1
+    "@polkadot/api": 3.4.2-3
+    "@polkadot/rpc-core": 3.4.2-3
+    "@polkadot/types": 3.4.2-3
     "@polkadot/util": ^5.2.3
     "@polkadot/util-crypto": ^5.2.3
-    "@polkadot/x-rxjs": 3.4.2-1
+    "@polkadot/x-rxjs": 3.4.2-3
     bn.js: ^4.11.9
-  checksum: 5290614fbaa83b8104b6e762df1b82ced68911ed2633bed9c7be010cbe9827e099b854c792d0ce8c75ef8d839814fb3a15adb75e9de9800fae68568f8c2e5304
+  checksum: 8298c7c858d15ec8cd08b2855b46e46ad8c66c749344aa8b30aba1ef7f9491739bd079ef6a3d07ab0c23befc71cb9d4dbc197c5415eff95fc08aadb7d237c7f1
   languageName: node
   linkType: hard
 
-"@polkadot/api@npm:^3.4.2-1":
-  version: 3.4.2-1
-  resolution: "@polkadot/api@npm:3.4.2-1"
+"@polkadot/api@npm:^3.4.2-3":
+  version: 3.4.2-3
+  resolution: "@polkadot/api@npm:3.4.2-3"
   dependencies:
     "@babel/runtime": ^7.12.5
-    "@polkadot/api-derive": 3.4.2-1
+    "@polkadot/api-derive": 3.4.2-3
     "@polkadot/keyring": ^5.2.3
-    "@polkadot/metadata": 3.4.2-1
-    "@polkadot/rpc-core": 3.4.2-1
-    "@polkadot/rpc-provider": 3.4.2-1
-    "@polkadot/types": 3.4.2-1
-    "@polkadot/types-known": 3.4.2-1
+    "@polkadot/metadata": 3.4.2-3
+    "@polkadot/rpc-core": 3.4.2-3
+    "@polkadot/rpc-provider": 3.4.2-3
+    "@polkadot/types": 3.4.2-3
+    "@polkadot/types-known": 3.4.2-3
     "@polkadot/util": ^5.2.3
     "@polkadot/util-crypto": ^5.2.3
-    "@polkadot/x-rxjs": 3.4.2-1
+    "@polkadot/x-rxjs": 3.4.2-3
     bn.js: ^4.11.9
     eventemitter3: ^4.0.7
-  checksum: 880468700bffdaab9be9b6abd4dfcf2b6ca27afdd13ba5a5246e31a212c33b09b5872bf4339a1a8a9a0f543b6859d7cac0baae0a21b60381535abf701ab1fbcf
+  checksum: b9c8e9da5a1c4fcf5d5ab1e3a05ae920217c5886dec7b54c009a422c4a7b413c5462c9335ddc0fd2e68c1bd90284266ac2eeea148e791971115db2860d2991b5
   languageName: node
   linkType: hard
 
@@ -2018,7 +2018,7 @@ __metadata:
   resolution: "@polkadot/app-contracts@workspace:packages/page-contracts"
   dependencies:
     "@babel/runtime": ^7.12.5
-    "@polkadot/api-contract": ^3.4.2-1
+    "@polkadot/api-contract": ^3.4.2-3
   languageName: unknown
   linkType: soft
 
@@ -2427,17 +2427,17 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@polkadot/metadata@npm:3.4.2-1":
-  version: 3.4.2-1
-  resolution: "@polkadot/metadata@npm:3.4.2-1"
+"@polkadot/metadata@npm:3.4.2-3":
+  version: 3.4.2-3
+  resolution: "@polkadot/metadata@npm:3.4.2-3"
   dependencies:
     "@babel/runtime": ^7.12.5
-    "@polkadot/types": 3.4.2-1
-    "@polkadot/types-known": 3.4.2-1
+    "@polkadot/types": 3.4.2-3
+    "@polkadot/types-known": 3.4.2-3
     "@polkadot/util": ^5.2.3
     "@polkadot/util-crypto": ^5.2.3
     bn.js: ^4.11.9
-  checksum: 7c4fc55aaeebb9e0ce2fe8b36b74bed78a807b716af1d5c2e6ac2f623ad05f5124f2359e275267ba14a310a7f87e1bbfe2ba4b55f239332fc46b4367c70519c7
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