diff --git a/packages/page-parachains/src/Parathreads/Actions.tsx b/packages/page-parachains/src/Parathreads/Actions.tsx
index c900bb85c1..a8b1469400 100644
--- a/packages/page-parachains/src/Parathreads/Actions.tsx
+++ b/packages/page-parachains/src/Parathreads/Actions.tsx
@@ -4,9 +4,10 @@
 import React from 'react';
 
 import { Button } from '@polkadot/react-components';
-import { useToggle } from '@polkadot/react-hooks';
+import { useApi, useToggle } from '@polkadot/react-hooks';
 
 import { useTranslation } from '../translate';
+import RegisterId from './RegisterId';
 import RegisterThread from './RegisterThread';
 
 interface Props {
@@ -15,13 +16,24 @@ interface Props {
 
 function Actions ({ className }: Props): React.ReactElement<Props> {
   const { t } = useTranslation();
+  const { api } = useApi();
   const [isRegisterOpen, toggleRegisterOpen] = useToggle();
+  const [isReserveOpen, toggleReserveOpen] = useToggle();
 
   return (
     <Button.Group className={className}>
       <Button
         icon='plus'
-        label={t<string>('Register')}
+        isDisabled={!api.tx.registrar.reserve}
+        label={t<string>('ParaId')}
+        onClick={toggleReserveOpen}
+      />
+      {isReserveOpen && (
+        <RegisterId onClose={toggleReserveOpen} />
+      )}
+      <Button
+        icon='plus'
+        label={t<string>('ParaThread')}
         onClick={toggleRegisterOpen}
       />
       {isRegisterOpen && (
diff --git a/packages/page-parachains/src/Parathreads/RegisterId.tsx b/packages/page-parachains/src/Parathreads/RegisterId.tsx
new file mode 100644
index 0000000000..e6c9569893
--- /dev/null
+++ b/packages/page-parachains/src/Parathreads/RegisterId.tsx
@@ -0,0 +1,77 @@
+// Copyright 2017-2021 @polkadot/app-parachains authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type BN from 'bn.js';
+import type { ParaId } from '@polkadot/types/interfaces';
+
+import React, { useState } from 'react';
+
+import { InputAddress, InputBalance, InputNumber, Modal, TxButton } from '@polkadot/react-components';
+import { useApi, useCall } from '@polkadot/react-hooks';
+
+import { useTranslation } from '../translate';
+import { LOWEST_PUBLIC_ID } from './constants';
+
+interface Props {
+  className?: string;
+  onClose: () => void;
+}
+
+const transformId = {
+  transform: (nextId: ParaId) =>
+    nextId.isZero()
+      ? LOWEST_PUBLIC_ID
+      : nextId
+};
+
+function RegisterId ({ className, onClose }: Props): React.ReactElement<Props> {
+  const { t } = useTranslation();
+  const { api } = useApi();
+  const [accountId, setAccountId] = useState<string | null>(null);
+  const nextParaId = useCall<ParaId | BN>(api.query.registrar?.nextFreeParaId, [], transformId);
+
+  return (
+    <Modal
+      className={className}
+      header={t<string>('Reserve ParaId')}
+      size='large'
+    >
+      <Modal.Content>
+        <Modal.Columns hint={t<string>('This account will be used to the Id reservation and for the future parathread.')}>
+          <InputAddress
+            label={t<string>('reserve from')}
+            onChange={setAccountId}
+            type='account'
+            value={accountId}
+          />
+        </Modal.Columns>
+        <Modal.Columns hint={t<string>('The Id of this parachain as known on the network')}>
+          <InputNumber
+            defaultValue={nextParaId}
+            isDsiabled
+            label={t<string>('parachain id')}
+          />
+        </Modal.Columns>
+        <Modal.Columns hint={t<string>('The reservation fee for this Id')}>
+          <InputBalance
+            defaultValue={api.consts.registrar.paraDeposit}
+            isDisabled
+            label={t<string>('reserved deposit')}
+          />
+        </Modal.Columns>
+      </Modal.Content>
+      <Modal.Actions onCancel={onClose}>
+        <TxButton
+          accountId={accountId}
+          icon='plus'
+          isDisabled={!nextParaId}
+          onStart={onClose}
+          params={[]}
+          tx={api.tx.registrar.reserve}
+        />
+      </Modal.Actions>
+    </Modal>
+  );
+}
+
+export default React.memo(RegisterId);
diff --git a/packages/page-parachains/src/Parathreads/RegisterThread.tsx b/packages/page-parachains/src/Parathreads/RegisterThread.tsx
index f93055c607..72eb6837cd 100644
--- a/packages/page-parachains/src/Parathreads/RegisterThread.tsx
+++ b/packages/page-parachains/src/Parathreads/RegisterThread.tsx
@@ -1,37 +1,28 @@
 // Copyright 2017-2021 @polkadot/app-parachains authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import type { ParaId } from '@polkadot/types/interfaces';
+import type BN from 'bn.js';
+import type { BalanceOf } from '@polkadot/types/interfaces';
 
-import BN from 'bn.js';
-import React, { useCallback, useState } from 'react';
+import React, { useCallback, useMemo, useState } from 'react';
 
-import { InputAddress, InputFile, InputNumber, Modal, TxButton } from '@polkadot/react-components';
-import { useApi, useCall } from '@polkadot/react-hooks';
+import { InputAddress, InputBalance, InputFile, InputNumber, Modal, TxButton } from '@polkadot/react-components';
+import { useApi } from '@polkadot/react-hooks';
 import { compactAddLength } from '@polkadot/util';
 
 import { useTranslation } from '../translate';
+import { LOWEST_INVALID_ID } from './constants';
 
 interface Props {
   className?: string;
   onClose: () => void;
 }
 
-const LOWEST_PUBLIC_ID = new BN(2_000);
-
-const transformId = {
-  transform: (nextId: ParaId) =>
-    nextId.isZero()
-      ? LOWEST_PUBLIC_ID
-      : nextId
-};
-
 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 | undefined>();
-  const nextParaId = useCall<ParaId | BN>(api.query.registrar?.nextFreeParaId, [], transformId);
   const [wasm, setWasm] = useState<Uint8Array | null>(null);
   const [genesisState, setGenesisState] = useState<Uint8Array | null>(null);
 
@@ -45,9 +36,14 @@ function RegisterThread ({ className, onClose }: Props): React.ReactElement<Prop
     []
   );
 
-  const isIdValid = api.tx.registrar.registerNext
-    ? !!nextParaId
-    : !!(paraId && paraId.gte(LOWEST_PUBLIC_ID));
+  const reservedDeposit = useMemo(
+    () => (api.consts.registrar.paraDeposit as BalanceOf)
+      .add((api.consts.registrar.dataDepositPerByte as BalanceOf).muln(wasm ? wasm.length : 0))
+      .iadd((api.consts.registrar.dataDepositPerByte as BalanceOf).muln(genesisState ? genesisState.length : 0)),
+    [api, wasm, genesisState]
+  );
+
+  const isIdError = !paraId || !paraId.gt(LOWEST_INVALID_ID);
 
   return (
     <Modal
@@ -65,28 +61,17 @@ function RegisterThread ({ className, onClose }: Props): React.ReactElement<Prop
           />
         </Modal.Columns>
         <Modal.Columns hint={t<string>('The id of this parachain as known on the network')}>
-          {api.tx.registrar.registerNext
-            ? (
-              <InputNumber
-                defaultValue={nextParaId || LOWEST_PUBLIC_ID}
-                isDisabled
-                isZeroable={false}
-                label={t<string>('parachain id')}
-              />
-            )
-            : (
-              <InputNumber
-                autoFocus
-                isZeroable={false}
-                label={t<string>('parachain id')}
-                onChange={setParaId}
-              />
-            )
-          }
+          <InputNumber
+            autoFocus
+            defaultValue={LOWEST_INVALID_ID}
+            isError={isIdError}
+            isZeroable={false}
+            label={t<string>('parachain id')}
+            onChange={setParaId}
+          />
         </Modal.Columns>
         <Modal.Columns hint={t<string>('The WASM validation function for this parachain.')}>
           <InputFile
-            autoFocus={!!api.tx.registrar.registerNext}
             help={t<string>('The compiled runtime WASM for the parachain you wish to register.')}
             isError={!wasm}
             label={t<string>('code')}
@@ -101,19 +86,22 @@ function RegisterThread ({ className, onClose }: Props): React.ReactElement<Prop
             onChange={_setGenesisState}
           />
         </Modal.Columns>
+        <Modal.Columns hint={t<string>('The reservation fee for this parachain, including base fee and per-byte fees')}>
+          <InputBalance
+            defaultValue={reservedDeposit}
+            isDisabled
+            label={t<string>('reserved deposit')}
+          />
+        </Modal.Columns>
       </Modal.Content>
       <Modal.Actions onCancel={onClose}>
         <TxButton
           accountId={accountId}
           icon='plus'
-          isDisabled={!wasm || !genesisState || !isIdValid}
+          isDisabled={!wasm || !genesisState || isIdError}
           onStart={onClose}
-          params={
-            api.tx.registrar.registerNext
-              ? [genesisState, wasm]
-              : [paraId, genesisState, wasm]
-          }
-          tx={api.tx.registrar.registerNext || api.tx.registrar.register}
+          params={[paraId, genesisState, wasm]}
+          tx={api.tx.registrar.register}
         />
       </Modal.Actions>
     </Modal>
diff --git a/packages/page-parachains/src/Parathreads/constants.tsx b/packages/page-parachains/src/Parathreads/constants.tsx
new file mode 100644
index 0000000000..7a9698ebbf
--- /dev/null
+++ b/packages/page-parachains/src/Parathreads/constants.tsx
@@ -0,0 +1,12 @@
+// Copyright 2017-2021 @polkadot/app-parachains authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import BN from 'bn.js';
+
+import { BN_ONE, BN_THOUSAND } from '@polkadot/util';
+
+export const LOWEST_PUBLIC_ID = new BN(2_000);
+
+export const LOWEST_INVALID_ID = LOWEST_PUBLIC_ID.sub(BN_ONE);
+
+export const LOWEST_USER_ID = BN_THOUSAND;