diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4069d8045e..612eb79a4b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ Changes:
 
 - Adjust teleport to only cater for latest XCM
 - Add blocktime latency tab to Explorer
+- Allow decoded extrinsics to populate submission
 
 
 ## 0.106.1 Feb 14, 2022
diff --git a/packages/page-extrinsics/src/Decoder.tsx b/packages/page-extrinsics/src/Decoder.tsx
index 9e7bdc01df..ff9e0b59ce 100644
--- a/packages/page-extrinsics/src/Decoder.tsx
+++ b/packages/page-extrinsics/src/Decoder.tsx
@@ -3,6 +3,7 @@
 
 import type { SubmittableExtrinsic, SubmittableExtrinsicFunction } from '@polkadot/api/types';
 import type { Call } from '@polkadot/types/interfaces';
+import type { DecodedExtrinsic } from './types';
 
 import React, { useCallback, useState } from 'react';
 import styled from 'styled-components';
@@ -17,6 +18,7 @@ import { useTranslation } from './translate';
 
 interface Props {
   className?: string;
+  setLast: (value: DecodedExtrinsic | null) => void;
 }
 
 interface ExtrinsicInfo {
@@ -37,7 +39,7 @@ const DEFAULT_INFO: ExtrinsicInfo = {
   extrinsicHex: null
 };
 
-function Decoder ({ className }: Props): React.ReactElement<Props> {
+function Decoder ({ className, setLast }: Props): React.ReactElement<Props> {
   const { t } = useTranslation();
   const { api } = useApi();
   const [{ decoded, extrinsic, extrinsicCall, extrinsicError, extrinsicFn }, setExtrinsicInfo] = useState<ExtrinsicInfo>(DEFAULT_INFO);
@@ -68,11 +70,13 @@ function Decoder ({ className }: Props): React.ReactElement<Props> {
         }
 
         setExtrinsicInfo({ ...DEFAULT_INFO, decoded, extrinsic, extrinsicCall, extrinsicFn, extrinsicHex });
+        setLast({ call: extrinsicCall, fn: extrinsicFn });
       } catch (e) {
         setExtrinsicInfo({ ...DEFAULT_INFO, extrinsicError: (e as Error).message });
+        setLast(null);
       }
     },
-    [api]
+    [api, setLast]
   );
 
   return (
diff --git a/packages/page-extrinsics/src/Submission.tsx b/packages/page-extrinsics/src/Submission.tsx
index 011f1fb8a7..ee63b0e876 100644
--- a/packages/page-extrinsics/src/Submission.tsx
+++ b/packages/page-extrinsics/src/Submission.tsx
@@ -1,7 +1,9 @@
 // Copyright 2017-2022 @polkadot/app-extrinsics authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import type { SubmittableExtrinsic } from '@polkadot/api/types';
+import type { SubmittableExtrinsic, SubmittableExtrinsicFunction } from '@polkadot/api/types';
+import type { RawParam } from '@polkadot/react-params/types';
+import type { DecodedExtrinsic } from './types';
 
 import React, { useCallback, useState } from 'react';
 
@@ -14,22 +16,45 @@ import { useTranslation } from './translate';
 
 interface Props {
   className?: string;
+  defaultValue: DecodedExtrinsic | null;
 }
 
-function Selection ({ className }: Props): React.ReactElement<Props> {
+interface DefaultExtrinsic {
+  defaultArgs?: RawParam[];
+  defaultFn: SubmittableExtrinsicFunction<'promise'>;
+}
+
+function extractDefaults (value: DecodedExtrinsic | null, defaultFn: SubmittableExtrinsicFunction<'promise'>): DefaultExtrinsic {
+  if (!value) {
+    return { defaultFn };
+  }
+
+  return {
+    defaultArgs: value.call.args.map((value) => ({
+      isValid: true,
+      value
+    })),
+    defaultFn: value.fn
+  };
+}
+
+function Selection ({ className, defaultValue }: Props): React.ReactElement<Props> {
   const { t } = useTranslation();
   const { apiDefaultTxSudo } = useApi();
   const [accountId, setAccountId] = useState<string | null>(null);
   const [error, setError] = useState<string | null>(null);
   const [extrinsic, setExtrinsic] = useState<SubmittableExtrinsic<'promise'> | null>(null);
+  const [{ defaultArgs, defaultFn }] = useState<DefaultExtrinsic>(() => extractDefaults(defaultValue, apiDefaultTxSudo));
 
   const _onExtrinsicChange = useCallback(
-    (method?: SubmittableExtrinsic<'promise'>) => setExtrinsic(() => method || null),
+    (method?: SubmittableExtrinsic<'promise'>) =>
+      setExtrinsic(() => method || null),
     []
   );
 
   const _onExtrinsicError = useCallback(
-    (error?: Error | null) => setError(error ? error.message : null),
+    (error?: Error | null) =>
+      setError(error ? error.message : null),
     []
   );
 
@@ -47,7 +72,8 @@ function Selection ({ className }: Props): React.ReactElement<Props> {
         type='account'
       />
       <Extrinsic
-        defaultValue={apiDefaultTxSudo}
+        defaultArgs={defaultArgs}
+        defaultValue={defaultFn}
         label={t<string>('submit the following extrinsic')}
         onChange={_onExtrinsicChange}
         onError={_onExtrinsicError}
diff --git a/packages/page-extrinsics/src/index.tsx b/packages/page-extrinsics/src/index.tsx
index 5e0d115e52..2eefc1c441 100644
--- a/packages/page-extrinsics/src/index.tsx
+++ b/packages/page-extrinsics/src/index.tsx
@@ -2,8 +2,9 @@
 // SPDX-License-Identifier: Apache-2.0
 
 import type { AppProps as Props } from '@polkadot/react-components/types';
+import type { DecodedExtrinsic } from './types';
 
-import React, { useRef } from 'react';
+import React, { useRef, useState } from 'react';
 import { Route, Switch } from 'react-router';
 
 import { Tabs } from '@polkadot/react-components';
@@ -14,6 +15,7 @@ import { useTranslation } from './translate';
 
 function ExtrinsicsApp ({ basePath }: Props): React.ReactElement<Props> {
   const { t } = useTranslation();
+  const [decoded, setDecoded] = useState<DecodedExtrinsic | null>(null);
 
   const itemsRef = useRef([
     {
@@ -34,9 +36,11 @@ function ExtrinsicsApp ({ basePath }: Props): React.ReactElement<Props> {
         items={itemsRef.current}
       />
       <Switch>
-        <Route path={`${basePath}/decode`}><Decoder /></Route>
+        <Route path={`${basePath}/decode`}>
+          <Decoder setLast={setDecoded} />
+        </Route>
         <Route>
-          <Submission />
+          <Submission defaultValue={decoded} />
         </Route>
       </Switch>
     </main>
diff --git a/packages/page-extrinsics/src/types.ts b/packages/page-extrinsics/src/types.ts
new file mode 100644
index 0000000000..b7a27234d9
--- /dev/null
+++ b/packages/page-extrinsics/src/types.ts
@@ -0,0 +1,10 @@
+// Copyright 2017-2022 @polkadot/app-extrinsics authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { SubmittableExtrinsicFunction } from '@polkadot/api/types';
+import type { Call } from '@polkadot/types/interfaces';
+
+export interface DecodedExtrinsic {
+  call: Call;
+  fn: SubmittableExtrinsicFunction<'promise'>;
+}
diff --git a/packages/react-components/src/Extrinsic.tsx b/packages/react-components/src/Extrinsic.tsx
index 9b063650a4..b8eaa66064 100644
--- a/packages/react-components/src/Extrinsic.tsx
+++ b/packages/react-components/src/Extrinsic.tsx
@@ -16,6 +16,7 @@ import paramComponents from './Params';
 
 interface Props {
   className?: string;
+  defaultArgs?: RawParam[];
   defaultValue: SubmittableExtrinsicFunction<'promise'>;
   isDisabled?: boolean;
   isError?: boolean;
@@ -28,15 +29,29 @@ interface Props {
   withLabel?: boolean;
 }
 
-interface CallState {
-  fn: SubmittableExtrinsicFunction<'promise'>;
-  params: {
-    name: string;
-    type: TypeDef
-  }[];
+interface ParamDef {
+  name: string;
+  type: TypeDef;
 }
 
-function getParams ({ meta }: SubmittableExtrinsicFunction<'promise'>): { name: string; type: TypeDef }[] {
+interface CallState {
+  extrinsic: {
+    fn: SubmittableExtrinsicFunction<'promise'>;
+    params: ParamDef[];
+  },
+  values: RawParam[];
+}
+
+function isValuesValid (params: ParamDef[], values: RawParam[]): boolean {
+  return values.reduce((isValid, value): boolean =>
+    isValid &&
+    !isUndefined(value) &&
+    !isUndefined(value.value) &&
+    value.isValid, params.length === values.length
+  );
+}
+
+function getParams ({ meta }: SubmittableExtrinsicFunction<'promise'>): ParamDef[] {
   return meta.args.map(({ name, type, typeName }): { name: string; type: TypeDef } => ({
     name: name.toString(),
     type: {
@@ -49,21 +64,21 @@ function getParams ({ meta }: SubmittableExtrinsicFunction<'promise'>): { name:
   }));
 }
 
-function ExtrinsicDisplay ({ defaultValue, isDisabled, isError, isPrivate, label, onChange, onEnter, onError, onEscape, withLabel }: Props): React.ReactElement<Props> {
-  const [extrinsic, setCall] = useState<CallState>(() => ({ fn: defaultValue, params: getParams(defaultValue) }));
-  const [values, setValues] = useState<RawParam[]>([]);
+function getCallState (fn: SubmittableExtrinsicFunction<'promise'>, values: RawParam[] = []): CallState {
+  return {
+    extrinsic: {
+      fn,
+      params: getParams(fn)
+    },
+    values
+  };
+}
+
+function ExtrinsicDisplay ({ defaultArgs, defaultValue, isDisabled, isError, isPrivate, label, onChange, onEnter, onError, onEscape, withLabel }: Props): React.ReactElement<Props> {
+  const [{ extrinsic, values }, setDisplay] = useState<CallState>(() => getCallState(defaultValue, defaultArgs));
 
   useEffect((): void => {
-    setValues([]);
-  }, [extrinsic]);
-
-  useEffect((): void => {
-    const isValid = values.reduce((isValid, value): boolean =>
-      isValid &&
-      !isUndefined(value) &&
-      !isUndefined(value.value) &&
-      value.isValid, extrinsic.params.length === values.length
-    );
+    const isValid = isValuesValid(extrinsic.params, values);
 
     let method;
 
@@ -81,7 +96,14 @@ function ExtrinsicDisplay ({ defaultValue, isDisabled, isError, isPrivate, label
   }, [extrinsic, onChange, onError, values]);
 
   const _onChangeMethod = useCallback(
-    (fn: SubmittableExtrinsicFunction<'promise'>): void => setCall({ fn, params: getParams(fn) }),
+    (fn: SubmittableExtrinsicFunction<'promise'>) =>
+      setDisplay(getCallState(fn)),
+    []
+  );
+
+  const _setValues = useCallback(
+    (values: RawParam[]) =>
+      setDisplay(({ extrinsic }) => ({ extrinsic, values })),
     []
   );
 
@@ -101,11 +123,12 @@ function ExtrinsicDisplay ({ defaultValue, isDisabled, isError, isPrivate, label
       />
       <Params
         key={`${section}.${method}:params` /* force re-render on change */}
-        onChange={setValues}
+        onChange={_setValues}
         onEnter={onEnter}
         onEscape={onEscape}
         overrides={paramComponents}
         params={params}
+        values={values}
       />
     </div>
   );
diff --git a/packages/react-params/src/Param/Account.tsx b/packages/react-params/src/Param/Account.tsx
index 510c77ba31..6b4dbc2aa8 100644
--- a/packages/react-params/src/Param/Account.tsx
+++ b/packages/react-params/src/Param/Account.tsx
@@ -10,28 +10,29 @@ import { keyring } from '@polkadot/ui-keyring';
 
 import Bare from './Bare';
 
+function isValidAddress (value?: string | null): boolean {
+  if (value) {
+    try {
+      keyring.decodeAddress(value);
+
+      return true;
+    } catch (err) {
+      console.error(err);
+    }
+  }
+
+  return false;
+}
+
 function Account ({ className = '', defaultValue: { value }, isDisabled, isError, isInOption, label, onChange, withLabel }: Props): React.ReactElement<Props> {
   const [defaultValue] = useState(() => (value as string)?.toString());
 
   const _onChange = useCallback(
-    (value?: string | null): void => {
-      let isValid = false;
-
-      if (value) {
-        try {
-          keyring.decodeAddress(value);
-
-          isValid = true;
-        } catch (err) {
-          console.error(err);
-        }
-      }
-
+    (value?: string | null) =>
       onChange && onChange({
-        isValid,
+        isValid: isValidAddress(value),
         value
-      });
-    },
+      }),
     [onChange]
   );
 
diff --git a/packages/react-params/src/Param/Amount.tsx b/packages/react-params/src/Param/Amount.tsx
index 3bedc983d4..d89fe55fd4 100644
--- a/packages/react-params/src/Param/Amount.tsx
+++ b/packages/react-params/src/Param/Amount.tsx
@@ -1,6 +1,7 @@
 // Copyright 2017-2022 @polkadot/react-params authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
+import type { Registry, TypeDef } from '@polkadot/types/types';
 import type { BN } from '@polkadot/util';
 import type { Props } from '../types';
 
@@ -11,6 +12,14 @@ import { bnToBn, formatNumber, isUndefined } from '@polkadot/util';
 
 import Bare from './Bare';
 
+function getBitLength (registry: Registry, { type }: TypeDef): number {
+  try {
+    return registry.createType(type as 'u32').bitLength();
+  } catch (error) {
+    return 32;
+  }
+}
+
 function Amount ({ className = '', defaultValue: { value }, isDisabled, isError, label, onChange, onEnter, registry, type, withLabel }: Props): React.ReactElement<Props> {
   const defaultValue = useMemo(
     () => isDisabled
@@ -22,21 +31,16 @@ function Amount ({ className = '', defaultValue: { value }, isDisabled, isError,
   );
 
   const bitLength = useMemo(
-    (): number => {
-      try {
-        return registry.createType(type.type as 'u32').bitLength();
-      } catch (error) {
-        return 32;
-      }
-    },
+    () => getBitLength(registry, type),
     [registry, type]
   );
 
   const _onChange = useCallback(
-    (value?: BN) => onChange && onChange({
-      isValid: !isUndefined(value),
-      value
-    }),
+    (value?: BN) =>
+      onChange && onChange({
+        isValid: !isUndefined(value),
+        value
+      }),
     [onChange]
   );
 
diff --git a/packages/react-params/src/Param/BaseBytes.tsx b/packages/react-params/src/Param/BaseBytes.tsx
index 95d2343cac..f34e40127a 100644
--- a/packages/react-params/src/Param/BaseBytes.tsx
+++ b/packages/react-params/src/Param/BaseBytes.tsx
@@ -78,7 +78,10 @@ function BaseBytes ({ asHex, children, className = '', defaultValue: { value },
           : u8aToHex(value as Uint8Array, isDisabled ? 256 : -1)
       : undefined
   );
-  const [{ isAddress, isValid, lastValue }, setValidity] = useState<Validity>(() => ({ isAddress: false, isValid: false }));
+  const [{ isAddress, isValid, lastValue }, setValidity] = useState<Validity>(() => ({
+    isAddress: false,
+    isValid: isHex(defaultValue)
+  }));
 
   const _onChange = useCallback(
     (hex: string): void => {
diff --git a/packages/react-params/src/Param/Enum.tsx b/packages/react-params/src/Param/Enum.tsx
index 542e9a4303..0191c418ad 100644
--- a/packages/react-params/src/Param/Enum.tsx
+++ b/packages/react-params/src/Param/Enum.tsx
@@ -1,10 +1,10 @@
 // Copyright 2017-2022 @polkadot/react-params authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import type { TypeDef } from '@polkadot/types/types';
+import type { Registry, TypeDef } from '@polkadot/types/types';
 import type { ParamDef, Props, RawParam } from '../types';
 
-import React, { useCallback, useEffect, useState } from 'react';
+import React, { useCallback, useState } from 'react';
 
 import { Dropdown } from '@polkadot/react-components';
 import { Enum, getTypeDef } from '@polkadot/types';
@@ -23,40 +23,61 @@ interface Options {
   subTypes: TypeDef[];
 }
 
+interface Initial {
+  initialEnum: string | null;
+  initialValues: RawParam[] | undefined;
+}
+
+function getSubTypes (registry: Registry, type: TypeDef): TypeDef[] {
+  const rawType = registry.createType(type.type as 'u32').toRawType();
+
+  return getTypeDef(rawType).sub as TypeDef[];
+}
+
+function getOptions (registry: Registry, type: TypeDef): Options {
+  const subTypes = getSubTypes(registry, type).filter(({ name }) => !!name && !name.startsWith('__Unused'));
+
+  return {
+    options: subTypes.map(({ name }): Option => ({
+      text: name,
+      value: name
+    })),
+    subTypes
+  };
+}
+
+function getInitial (defaultValue: RawParam): Initial {
+  return {
+    initialEnum: defaultValue && defaultValue.value
+      ? defaultValue.value instanceof Enum
+        ? defaultValue.value.type
+        : Object.keys(defaultValue.value as Record<string, unknown>)[0]
+      : null,
+    initialValues: defaultValue && defaultValue.value
+      ? defaultValue.value instanceof Enum
+        ? [{ isValid: true, value: defaultValue.value.inner }]
+        : undefined
+      : undefined
+  };
+}
+
+function getCurrent (registry: Registry, type: TypeDef, defaultValue: RawParam, subTypes: TypeDef[]): ParamDef[] | null {
+  const subs = getSubTypes(registry, type);
+
+  return defaultValue.value instanceof Enum
+    ? [{ name: defaultValue.value.type, type: subs[defaultValue.value.index] }]
+    : [{ name: subTypes[0].name, type: subTypes[0] }];
+}
+
 function EnumParam (props: Props): React.ReactElement<Props> {
   const { className = '', defaultValue, isDisabled, isError, label, onChange, overrides, registry, type, withLabel } = props;
-  const [current, setCurrent] = useState<ParamDef[] | null>(null);
-  const [initialValue, setInitialValue] = useState<string | null>(null);
-  const [{ options, subTypes }, setOptions] = useState<Options>({ options: [], subTypes: [] });
-
-  useEffect((): void => {
-    const rawType = registry.createType(type.type as 'u32').toRawType();
-    const typeDef = getTypeDef(rawType);
-    const subTypes = (typeDef.sub as TypeDef[]).filter(({ name }) => !!name && !name.startsWith('__Unused'));
-
-    setOptions({
-      options: subTypes.map(({ name }): Option => ({
-        text: name,
-        value: name
-      })),
-      subTypes
-    });
-    setCurrent([{ name: subTypes[0].name, type: subTypes[0] }]);
-  }, [registry, type]);
-
-  useEffect((): void => {
-    setInitialValue(
-      defaultValue && defaultValue.value
-        ? defaultValue.value instanceof Enum
-          ? defaultValue.value.type
-          : Object.keys(defaultValue.value as Record<string, unknown>)[0]
-        : null
-    );
-  }, [defaultValue]);
+  const [{ options, subTypes }] = useState<Options>(() => getOptions(registry, type));
+  const [current, setCurrent] = useState<ParamDef[] | null>(() => getCurrent(registry, type, defaultValue, subTypes));
+  const [{ initialEnum, initialValues }] = useState<Initial>(() => getInitial(defaultValue));
 
   const _onChange = useCallback(
     (value: string): void => {
-      const newType = subTypes.find(({ name }): boolean => name === value) || null;
+      const newType = subTypes.find(({ name }) => name === value) || null;
 
       setCurrent(
         newType
@@ -85,7 +106,7 @@ function EnumParam (props: Props): React.ReactElement<Props> {
     <Bare className={className}>
       <Dropdown
         className='full'
-        defaultValue={initialValue}
+        defaultValue={initialEnum}
         isDisabled={isDisabled}
         isError={isError}
         label={label}
@@ -100,6 +121,7 @@ function EnumParam (props: Props): React.ReactElement<Props> {
           overrides={overrides}
           params={current}
           registry={registry}
+          values={initialValues}
         />
       )}
     </Bare>
diff --git a/packages/react-params/src/Param/Struct.tsx b/packages/react-params/src/Param/Struct.tsx
index b44b768f21..4528d1a533 100644
--- a/packages/react-params/src/Param/Struct.tsx
+++ b/packages/react-params/src/Param/Struct.tsx
@@ -3,16 +3,26 @@
 
 import type { Props, RawParam } from '../types';
 
-import React, { useCallback } from 'react';
+import React, { useCallback, useState } from 'react';
+
+import { Struct } from '@polkadot/types';
+import { isCodec } from '@polkadot/util';
 
 import Params from '../';
 import Base from './Base';
 import Static from './Static';
 import useParamDefs from './useParamDefs';
 
+function extractValues ({ isValid, value }: RawParam): RawParam[] | undefined {
+  return (isValid && isCodec(value) && value instanceof Struct)
+    ? value.toArray().map((value) => ({ isValid: true, value }))
+    : undefined;
+}
+
 function StructParam (props: Props): React.ReactElement<Props> {
   const params = useParamDefs(props.registry, props.type);
-  const { className = '', isDisabled, label, onChange, overrides, withLabel } = props;
+  const { className = '', defaultValue, isDisabled, label, onChange, overrides, withLabel } = props;
+  const [values] = useState(() => extractValues(defaultValue));
 
   const _onChangeParams = useCallback(
     (values: RawParam[]): void => {
@@ -44,6 +54,7 @@ function StructParam (props: Props): React.ReactElement<Props> {
         overrides={overrides}
         params={params}
         registry={props.registry}
+        values={values}
       />
     </div>
   );
diff --git a/packages/react-params/src/Param/Tuple.tsx b/packages/react-params/src/Param/Tuple.tsx
index f7cf7b0693..787c315e8e 100644
--- a/packages/react-params/src/Param/Tuple.tsx
+++ b/packages/react-params/src/Param/Tuple.tsx
@@ -3,21 +3,30 @@
 
 import type { Props, RawParam } from '../types';
 
-import React, { useCallback } from 'react';
+import React, { useCallback, useState } from 'react';
+
+import { Tuple } from '@polkadot/types';
 
 import Params from '../';
 import Base from './Base';
 import Static from './Static';
 import useParamDefs from './useParamDefs';
 
-function Tuple (props: Props): React.ReactElement<Props> {
+function getInitialValues ({ value }: RawParam): RawParam[] {
+  return value instanceof Tuple
+    ? value.map((value) => ({ isValid: true, value: value as unknown }))
+    : value as RawParam[];
+}
+
+function TupleDisplay (props: Props): React.ReactElement<Props> {
   const params = useParamDefs(props.registry, props.type);
-  const { className = '', isDisabled, label, onChange, overrides, withLabel } = props;
+  const { className = '', defaultValue, isDisabled, label, onChange, overrides, withLabel } = props;
+  const [values] = useState<RawParam[]>(() => getInitialValues(defaultValue));
 
   const _onChangeParams = useCallback(
     (values: RawParam[]): void => {
       onChange && onChange({
-        isValid: values.reduce((result: boolean, { isValid }) => result && isValid, true),
+        isValid: values.reduce<boolean>((result, { isValid }) => result && isValid, true),
         value: values.map(({ value }) => value)
       });
     },
@@ -40,9 +49,10 @@ function Tuple (props: Props): React.ReactElement<Props> {
         overrides={overrides}
         params={params}
         registry={props.registry}
+        values={values}
       />
     </div>
   );
 }
 
-export default React.memo(Tuple);
+export default React.memo(TupleDisplay);
diff --git a/packages/react-params/src/Param/Vector.tsx b/packages/react-params/src/Param/Vector.tsx
index 485f589dc0..8b0f4a119d 100644
--- a/packages/react-params/src/Param/Vector.tsx
+++ b/packages/react-params/src/Param/Vector.tsx
@@ -14,32 +14,48 @@ import Params from '../';
 import Base from './Base';
 import useParamDefs from './useParamDefs';
 
-function generateParam ([{ name, type }]: ParamDef[], index: number): ParamDef {
+function getParam ([{ name, type }]: ParamDef[], index: number): ParamDef {
   return {
     name: `${index}: ${name || type.type}`,
     type
   };
 }
 
+export function getParams (inputParams: ParamDef[], prev: ParamDef[], max: number): ParamDef[] {
+  if (prev.length === max) {
+    return prev;
+  }
+
+  const params: ParamDef[] = [];
+
+  for (let index = 0; index < max; index++) {
+    params.push(getParam(inputParams, index));
+  }
+
+  return params;
+}
+
+export function getValues ({ value }: RawParam): RawParam[] {
+  return (value as RawParam[] || []).map((value: RawParam) =>
+    isUndefined(value) || isUndefined(value.isValid)
+      ? { isValid: !isUndefined(value), value }
+      : value
+  );
+}
+
 function Vector ({ className = '', defaultValue, isDisabled = false, label, onChange, overrides, registry, type, withLabel }: Props): React.ReactElement<Props> | null {
   const { t } = useTranslation();
   const inputParams = useParamDefs(registry, type);
-  const [count, setCount] = useState(0);
-  const [params, setParams] = useState<ParamDef[]>([]);
-  const [values, setValues] = useState<RawParam[]>([]);
+  const [values, setValues] = useState<RawParam[]>(() => getValues(defaultValue));
+  const [count, setCount] = useState(() => values.length);
+  const [params, setParams] = useState<ParamDef[]>(() => getParams(inputParams, [], count));
 
   // build up the list of parameters we are using
   useEffect((): void => {
-    if (inputParams.length) {
-      const max = isDisabled ? (defaultValue.value as RawParam[] || []).length : count;
-      const params: ParamDef[] = [];
-
-      for (let index = 0; index < max; index++) {
-        params.push(generateParam(inputParams, index));
-      }
-
-      setParams(params);
-    }
+    inputParams.length &&
+      setParams((prev) =>
+        getParams(inputParams, prev, isDisabled ? (defaultValue.value as RawParam[] || []).length : count)
+      );
   }, [count, defaultValue, isDisabled, inputParams]);
 
   // when !isDisable, generating an input list based on count
@@ -58,24 +74,12 @@ function Vector ({ className = '', defaultValue, isDisabled = false, label, onCh
 
         return values.slice(0, count);
       });
-  }, [count, inputParams, isDisabled, registry]);
-
-  // when isDisabled, set the values based on the defaultValue input
-  useEffect((): void => {
-    isDisabled &&
-      setValues(
-        (defaultValue.value as RawParam[] || []).map((value: RawParam) =>
-          isUndefined(value) || isUndefined(value.isValid)
-            ? { isValid: !isUndefined(value), value }
-            : value
-        )
-      );
-  }, [defaultValue, isDisabled]);
+  }, [count, defaultValue, inputParams, isDisabled, registry]);
 
   // when our values has changed, alert upstream
   useEffect((): void => {
     onChange && onChange({
-      isValid: values.reduce((result: boolean, { isValid }) => result && isValid, true),
+      isValid: values.reduce<boolean>((result, { isValid }) => result && isValid, true),
       value: values.map(({ value }) => value)
     });
   }, [values, onChange]);
diff --git a/packages/react-params/src/Param/VectorFixed.tsx b/packages/react-params/src/Param/VectorFixed.tsx
index 2a6a14e36a..02f2b05a61 100644
--- a/packages/react-params/src/Param/VectorFixed.tsx
+++ b/packages/react-params/src/Param/VectorFixed.tsx
@@ -5,39 +5,25 @@ import type { ParamDef, Props, RawParam } from '../types';
 
 import React, { useEffect, useState } from 'react';
 
+import { VecFixed } from '@polkadot/types';
 import { isUndefined } from '@polkadot/util';
 
 import getInitValue from '../initValue';
 import Params from '../';
 import Base from './Base';
 import useParamDefs from './useParamDefs';
+import { getParams, getValues } from './Vector';
 
-function generateParam ([{ name, type }]: ParamDef[], index: number): ParamDef {
-  return {
-    name: `${index}: ${name || type.type}`,
-    type
-  };
+function getInitialValues (defaultValue: RawParam): RawParam[] {
+  return defaultValue.value instanceof VecFixed
+    ? defaultValue.value.map((value) => ({ isValid: true, value: value as unknown }))
+    : getValues(defaultValue);
 }
 
 function VectorFixed ({ className = '', defaultValue, isDisabled = false, label, onChange, overrides, registry, type, withLabel }: Props): React.ReactElement<Props> | null {
   const inputParams = useParamDefs(registry, type);
-  const [params, setParams] = useState<ParamDef[]>([]);
-  const [values, setValues] = useState<RawParam[]>([]);
-
-  // build up the list of parameters we are using
-  useEffect((): void => {
-    if (inputParams.length) {
-      const count = (inputParams[0].length || 1);
-      const max = isDisabled ? (defaultValue.value as RawParam[] || []).length : count;
-      const params: ParamDef[] = [];
-
-      for (let index = 0; index < max; index++) {
-        params.push(generateParam(inputParams, index));
-      }
-
-      setParams(params);
-    }
-  }, [defaultValue, isDisabled, inputParams]);
+  const [params] = useState<ParamDef[]>(() => getParams(inputParams, [], (inputParams[0].length || 1)));
+  const [values, setValues] = useState<RawParam[]>(() => getInitialValues(defaultValue));
 
   // when !isDisable, generating an input list based on count
   useEffect((): void => {
@@ -59,18 +45,6 @@ function VectorFixed ({ className = '', defaultValue, isDisabled = false, label,
       });
   }, [inputParams, isDisabled, registry]);
 
-  // when isDisabled, set the values based on the defaultValue input
-  useEffect((): void => {
-    isDisabled &&
-      setValues(
-        (defaultValue.value as RawParam[] || []).map((value: RawParam) =>
-          isUndefined(value) || isUndefined(value.isValid)
-            ? { isValid: !isUndefined(value), value }
-            : value
-        )
-      );
-  }, [defaultValue, isDisabled]);
-
   // when our values has changed, alert upstream
   useEffect((): void => {
     onChange && onChange({
diff --git a/packages/react-params/src/Param/useParamDefs.ts b/packages/react-params/src/Param/useParamDefs.ts
index e37d4e6afb..e7c88968bb 100644
--- a/packages/react-params/src/Param/useParamDefs.ts
+++ b/packages/react-params/src/Param/useParamDefs.ts
@@ -4,7 +4,7 @@
 import type { Registry, TypeDef } from '@polkadot/types/types';
 import type { ParamDef } from '../types';
 
-import { useEffect, useState } from 'react';
+import { useMemo } from 'react';
 
 import { createNamedHook } from '@polkadot/react-hooks';
 import { getTypeDef } from '@polkadot/types/create';
@@ -19,26 +19,23 @@ function expandDef (registry: Registry, td: TypeDef): TypeDef {
   }
 }
 
+function getDefs (registry: Registry, type: TypeDef): ParamDef[] {
+  const typeDef = expandDef(registry, type);
+
+  return typeDef.sub
+    ? (Array.isArray(typeDef.sub) ? typeDef.sub : [typeDef.sub]).map((td): ParamDef => ({
+      length: typeDef.length,
+      name: td.name,
+      type: td
+    }))
+    : [];
+}
+
 function useParamDefsImpl (registry: Registry, type: TypeDef): ParamDef[] {
-  const [params, setParams] = useState<ParamDef[]>([]);
-
-  useEffect((): void => {
-    const typeDef = expandDef(registry, type);
-
-    if (!typeDef.sub) {
-      return setParams([]);
-    }
-
-    setParams(
-      (Array.isArray(typeDef.sub) ? typeDef.sub : [typeDef.sub]).map((td): ParamDef => ({
-        length: typeDef.length,
-        name: td.name,
-        type: td // expandDef(td)
-      }))
-    );
-  }, [registry, type]);
-
-  return params;
+  return useMemo(
+    () => getDefs(registry, type),
+    [registry, type]
+  );
 }
 
 export default createNamedHook('useParamDefs', useParamDefsImpl);
diff --git a/packages/react-params/src/index.tsx b/packages/react-params/src/index.tsx
index 6d3af5b362..ae4e4bf5e5 100644
--- a/packages/react-params/src/index.tsx
+++ b/packages/react-params/src/index.tsx
@@ -50,13 +50,15 @@ class Params extends React.PureComponent<Props, State> {
     return {
       params,
       values: params.reduce(
-        (result: RawParams, param, index): RawParams => [
-          ...result,
-          values && values[index]
-            ? values[index]
-            : createValue(registry, param)
-        ],
-        []
+        (result: RawParams, param, index): RawParams => {
+          result.push(
+            values && values[index]
+              ? values[index]
+              : createValue(registry, param)
+          );
+
+          return result;
+        }, []
       )
     };
   }