diff --git a/src/logic/contracts/methodIds.ts b/src/logic/contracts/methodIds.ts
index 351df109..851c0273 100644
--- a/src/logic/contracts/methodIds.ts
+++ b/src/logic/contracts/methodIds.ts
@@ -57,6 +57,7 @@ type TokenMethods = 'transfer' | 'transferFrom' | 'safeTransferFrom'
 
 type DecodedValues = Array<{
   name: string
+  type?: string
   value: string
 }>
 
@@ -70,7 +71,12 @@ type TokenDecodedParams = {
 
 export type DecodedMethods = SafeDecodedParams | TokenDecodedParams | null
 
-export const decodeParamsFromSafeMethod = (data: string): SafeDecodedParams | null => {
+export interface DataDecoded {
+  method: SafeMethods | TokenMethods
+  parameters: DecodedValues
+}
+
+export const decodeParamsFromSafeMethod = (data: string): DataDecoded | null => {
   const [methodId, params] = [data.slice(0, 10) as keyof typeof METHOD_TO_ID | string, data.slice(10)]
 
   switch (methodId) {
@@ -78,10 +84,11 @@ export const decodeParamsFromSafeMethod = (data: string): SafeDecodedParams | nu
     case '0xe318b52b': {
       const decodedParameters = web3.eth.abi.decodeParameters(['uint', 'address', 'address'], params)
       return {
-        [METHOD_TO_ID[methodId]]: [
+        method: METHOD_TO_ID[methodId],
+        parameters: [
           { name: 'oldOwner', value: decodedParameters[1] },
           { name: 'newOwner', value: decodedParameters[2] },
-        ]
+        ],
       }
     }
 
@@ -89,10 +96,11 @@ export const decodeParamsFromSafeMethod = (data: string): SafeDecodedParams | nu
     case '0x0d582f13': {
       const decodedParameters = web3.eth.abi.decodeParameters(['address', 'uint'], params)
       return {
-        [METHOD_TO_ID[methodId]]: [
+        method: METHOD_TO_ID[methodId],
+        parameters: [
           { name: 'owner', value: decodedParameters[0] },
           { name: '_threshold', value: decodedParameters[1] },
-        ]
+        ],
       }
     }
 
@@ -100,10 +108,11 @@ export const decodeParamsFromSafeMethod = (data: string): SafeDecodedParams | nu
     case '0xf8dc5dd9': {
       const decodedParameters = web3.eth.abi.decodeParameters(['address', 'address', 'uint'], params)
       return {
-        [METHOD_TO_ID[methodId]]: [
+        method: METHOD_TO_ID[methodId],
+        parameters: [
           { name: 'oldOwner', value: decodedParameters[1] },
           { name: '_threshold', value: decodedParameters[2] },
-        ]
+        ],
       }
     }
 
@@ -111,9 +120,10 @@ export const decodeParamsFromSafeMethod = (data: string): SafeDecodedParams | nu
     case '0x694e80c3': {
       const decodedParameters = web3.eth.abi.decodeParameters(['uint'], params)
       return {
-        [METHOD_TO_ID[methodId]]: [
+        method: METHOD_TO_ID[methodId],
+        parameters: [
           { name: '_threshold', value: decodedParameters[0] },
-        ]
+        ],
       }
     }
 
@@ -126,7 +136,7 @@ const isSafeMethod = (methodId: string): boolean => {
   return !!METHOD_TO_ID[methodId]
 }
 
-export const decodeMethods = (data: string): DecodedMethods => {
+export const decodeMethods = (data: string): DataDecoded | null => {
   const [methodId, params] = [data.slice(0, 10), data.slice(10)]
 
   if (isSafeMethod(methodId)) {
@@ -138,10 +148,11 @@ export const decodeMethods = (data: string): DecodedMethods => {
     case '0xa9059cbb': {
       const decodeParameters = web3.eth.abi.decodeParameters(['address', 'uint'], params)
       return {
-        transfer: [
+        method: 'transfer',
+        parameters: [
           { name: 'to', value: decodeParameters[0] },
           { name: 'value', value: decodeParameters[1] },
-        ]
+        ],
       }
     }
 
@@ -149,23 +160,25 @@ export const decodeMethods = (data: string): DecodedMethods => {
     case '0x23b872dd': {
       const decodeParameters = web3.eth.abi.decodeParameters(['address', 'address', 'uint'], params)
       return {
-        transferFrom: [
+        method: 'transferFrom',
+        parameters: [
           { name: 'from', value: decodeParameters[0] },
           { name: 'to', value: decodeParameters[1] },
           { name: 'value', value: decodeParameters[2] },
-        ]
+        ],
       }
     }
 
     // 42842e0e - safeTransferFrom(address,address,uint256)
-    case '0x42842e0e':{
+    case '0x42842e0e': {
       const decodedParameters = web3.eth.abi.decodeParameters(['address', 'address', 'uint'], params)
       return {
-        safeTransferFrom: [
+        method: 'safeTransferFrom',
+        parameters: [
           { name: 'from', value: decodedParameters[0] },
           { name: 'to', value: decodedParameters[1] },
           { name: 'value', value: decodedParameters[2] },
-        ]
+        ],
       }
     }
 
diff --git a/src/logic/currencyValues/store/actions/fetchCurrencyValues.ts b/src/logic/currencyValues/store/actions/fetchCurrencyValues.ts
index 6d92ff3e..2c098cbf 100644
--- a/src/logic/currencyValues/store/actions/fetchCurrencyValues.ts
+++ b/src/logic/currencyValues/store/actions/fetchCurrencyValues.ts
@@ -9,7 +9,7 @@ import { loadCurrencyValues } from 'src/logic/currencyValues/store/utils/currenc
 
 export const fetchCurrencyValues = (safeAddress: string) => async (dispatch) => {
   try {
-    const storedCurrencies: Map<string, CurrencyRateValue> | {} = await loadCurrencyValues()
+    const storedCurrencies: Map<string, CurrencyRateValue> | any = await loadCurrencyValues()
     const storedCurrency = storedCurrencies[safeAddress]
     if (!storedCurrency) {
       return batch(() => {
diff --git a/src/logic/currencyValues/store/utils/currencyValuesStorage.ts b/src/logic/currencyValues/store/utils/currencyValuesStorage.ts
index 280169d2..002c8884 100644
--- a/src/logic/currencyValues/store/utils/currencyValuesStorage.ts
+++ b/src/logic/currencyValues/store/utils/currencyValuesStorage.ts
@@ -11,6 +11,6 @@ export const saveCurrencyValues = async (currencyValues: Map<string, CurrencyRat
   }
 }
 
-export const loadCurrencyValues = async (): Promise<Map<string, CurrencyRateValue> | {}> => {
+export const loadCurrencyValues = async (): Promise<Map<string, CurrencyRateValue> | any> => {
   return (await loadFromStorage(CURRENCY_VALUES_STORAGE_KEY)) || {}
 }
diff --git a/src/logic/safe/transactions/send.ts b/src/logic/safe/transactions/send.ts
index 3b372111..7063e93c 100644
--- a/src/logic/safe/transactions/send.ts
+++ b/src/logic/safe/transactions/send.ts
@@ -1,6 +1,7 @@
 import GnosisSafeSol from '@gnosis.pm/safe-contracts/build/contracts/GnosisSafe.json'
 
 import { getWeb3 } from 'src/logic/wallets/getWeb3'
+import { TxArgs } from 'src/routes/safe/store/models/types/transaction'
 
 export const CALL = 0
 export const DELEGATE_CALL = 1
@@ -20,7 +21,7 @@ export const getApprovalTransaction = async ({
   sender,
   to,
   valueInWei,
-}) => {
+}: TxArgs) => {
   const txHash = await safeInstance.getTransactionHash(
     to,
     valueInWei,
@@ -61,7 +62,7 @@ export const getExecutionTransaction = async ({
   sigs,
   to,
   valueInWei,
-}) => {
+}: TxArgs) => {
   try {
     const web3 = getWeb3()
     const contract: any = new web3.eth.Contract(GnosisSafeSol.abi as any, safeInstance.address)
diff --git a/src/logic/wallets/store/model/provider.ts b/src/logic/wallets/store/model/provider.ts
index 4b07702a..1e8ad09a 100644
--- a/src/logic/wallets/store/model/provider.ts
+++ b/src/logic/wallets/store/model/provider.ts
@@ -1,6 +1,16 @@
-import { Record } from 'immutable'
+import { Record, RecordOf } from 'immutable'
 
-export const makeProvider = Record({
+export type ProviderProps = {
+  name: string
+  loaded: boolean
+  available: boolean
+  account: string
+  network: number
+  smartContractWallet: boolean
+  hardwareWallet: boolean
+}
+
+export const makeProvider = Record<ProviderProps>({
   name: '',
   loaded: false,
   available: false,
@@ -10,4 +20,6 @@ export const makeProvider = Record({
   hardwareWallet: false,
 })
 
-// Useage const someProvider: Provider = makeProvider({ name: 'METAMASK', loaded: false, available: false })
+// Usage const someProvider: Provider = makeProvider({ name: 'METAMASK', loaded: false, available: false })
+
+export type ProviderRecord = RecordOf<ProviderProps>
diff --git a/src/routes/opening/components/Footer.tsx b/src/routes/opening/components/Footer.tsx
index 36aca11d..9e007b65 100644
--- a/src/routes/opening/components/Footer.tsx
+++ b/src/routes/opening/components/Footer.tsx
@@ -1,4 +1,4 @@
-import React from 'react'
+import React, { SyntheticEvent } from 'react'
 import styled from 'styled-components'
 
 import Button from 'src/components/layout/Button'
@@ -36,14 +36,20 @@ export const ContinueFooter = ({
   onContinue,
 }: {
   continueButtonDisabled: boolean
-  onContinue: () => void
+  onContinue: (event: SyntheticEvent) => void
 }) => (
   <Button color="primary" disabled={continueButtonDisabled} onClick={onContinue} variant="contained">
     Continue
   </Button>
 )
 
-export const ErrorFooter = ({ onCancel, onRetry }: { onCancel: () => void; onRetry: () => void }) => (
+export const ErrorFooter = ({
+  onCancel,
+  onRetry,
+}: {
+  onCancel: (event: SyntheticEvent) => void
+  onRetry: (event: SyntheticEvent) => void
+}) => (
   <>
     <ButtonWithMargin onClick={onCancel} variant="contained">
       Cancel
diff --git a/src/routes/safe/components/Apps/AddAppForm.tsx b/src/routes/safe/components/Apps/AddAppForm.tsx
index fd5f2609..5eafad7b 100644
--- a/src/routes/safe/components/Apps/AddAppForm.tsx
+++ b/src/routes/safe/components/Apps/AddAppForm.tsx
@@ -102,7 +102,7 @@ const curriedSafeAppValidator = memoize((appList) => async (value: string) => {
   }
 })
 
-const composeValidatorsApps = (...validators: Function[]) => (value, values, meta) => {
+const composeValidatorsApps = (...validators) => (value, values, meta) => {
   if (!meta.modified) {
     return
   }
diff --git a/src/routes/safe/components/Balances/SendModal/screens/ContractInteraction/index.tsx b/src/routes/safe/components/Balances/SendModal/screens/ContractInteraction/index.tsx
index 1d200145..48dba963 100644
--- a/src/routes/safe/components/Balances/SendModal/screens/ContractInteraction/index.tsx
+++ b/src/routes/safe/components/Balances/SendModal/screens/ContractInteraction/index.tsx
@@ -19,13 +19,14 @@ import MethodsDropdown from './MethodsDropdown'
 import RenderInputParams from './RenderInputParams'
 import RenderOutputParams from './RenderOutputParams'
 import { abiExtractor, createTxObject, formMutators, handleSubmitError, isReadMethod, ensResolver } from './utils'
+import { TransactionReviewType } from './Review'
 
 const useStyles = makeStyles(styles)
 
 export interface CreatedTx {
   contractAddress: string
   data: string
-  selectedMethod: any
+  selectedMethod: TransactionReviewType
   value: string | number
 }
 
diff --git a/src/routes/safe/components/Layout/index.tsx b/src/routes/safe/components/Layout/index.tsx
index d2c85e94..81aaccce 100644
--- a/src/routes/safe/components/Layout/index.tsx
+++ b/src/routes/safe/components/Layout/index.tsx
@@ -34,10 +34,10 @@ const AddressBookTable = React.lazy(() => import('src/routes/safe/components/Add
 interface Props {
   sendFunds: Record<string, any>
   showReceive: boolean
-  onShow: Function
-  onHide: Function
-  showSendFunds: Function
-  hideSendFunds: Function
+  onShow: (value: string) => void
+  onHide: (value: string) => void
+  showSendFunds: (value: string) => void
+  hideSendFunds: () => void
   match: Record<string, any>
   location: Record<string, any>
   history: Record<string, any>
diff --git a/src/routes/safe/components/Transactions/TxsTable/ExpandedTx/TxDescription/utils.ts b/src/routes/safe/components/Transactions/TxsTable/ExpandedTx/TxDescription/utils.ts
index 01159987..cd810666 100644
--- a/src/routes/safe/components/Transactions/TxsTable/ExpandedTx/TxDescription/utils.ts
+++ b/src/routes/safe/components/Transactions/TxsTable/ExpandedTx/TxDescription/utils.ts
@@ -51,6 +51,11 @@ export const getTxData = (tx) => {
         txData.addedOwner = newOwner
       }
     }
+    if (tx.multiSendTx) {
+      txData.recipient = tx.recipient
+      txData.data = tx.data
+      txData.customTx = true
+    }
   } else if (tx.customTx) {
     txData.recipient = tx.recipient
     txData.data = tx.data
diff --git a/src/routes/safe/store/actions/createTransaction.ts b/src/routes/safe/store/actions/createTransaction.ts
index be558b0e..a6cb1b57 100644
--- a/src/routes/safe/store/actions/createTransaction.ts
+++ b/src/routes/safe/store/actions/createTransaction.ts
@@ -27,13 +27,14 @@ import { removeTransaction } from 'src/routes/safe/store/actions/transactions/re
 import {
   generateSafeTxHash,
   mockTransaction,
+  TxToMock,
 } from 'src/routes/safe/store/actions/transactions/utils/transactionHelpers'
 import { getLastTx, getNewTxNonce, shouldExecuteTransaction } from 'src/routes/safe/store/actions/utils'
 import { getErrorMessage } from 'src/test/utils/ethereumErrors'
 import { makeConfirmation } from '../models/confirmation'
 import fetchTransactions from './transactions/fetchTransactions'
 import { safeTransactionsSelector } from 'src/routes/safe/store/selectors'
-import { TransactionStatus } from 'src/routes/safe/store/models/types/transaction'
+import { TransactionStatus, TxArgs } from 'src/routes/safe/store/models/types/transaction'
 
 export const removeTxFromStore = (tx, safeAddress, dispatch, state) => {
   if (tx.isCancellationTx) {
@@ -120,7 +121,7 @@ const createTransaction = ({
 
   let txHash
   let tx
-  const txArgs = {
+  const txArgs: TxArgs = {
     safeInstance,
     to,
     valueInWei,
@@ -129,7 +130,7 @@ const createTransaction = ({
     nonce,
     safeTxGas,
     baseGas: 0,
-    gasPrice: 0,
+    gasPrice: '0',
     gasToken: ZERO_ADDRESS,
     refundReceiver: ZERO_ADDRESS,
     sender: from,
@@ -164,7 +165,7 @@ const createTransaction = ({
       sendParams.gas = '7000000'
     }
 
-    const txToMock = {
+    const txToMock: TxToMock = {
       ...txArgs,
       confirmations: [], // this is used to determine if a tx is pending or not. See `calculateTransactionStatus` helper
       value: txArgs.valueInWei,
@@ -223,9 +224,9 @@ const createTransaction = ({
                 .set('executor', from)
                 .set('isExecuted', true)
                 .set('isSuccessful', receipt.status)
-                .set('status', receipt.status ? 'success' : 'failed')
+                .set('status', receipt.status ? TransactionStatus.SUCCESS : TransactionStatus.FAILED)
             })
-          : mockedTx.set('status', 'awaiting_confirmations')
+          : mockedTx.set('status', TransactionStatus.AWAITING_CONFIRMATIONS)
 
         await storeTx(
           toStoreTx.withMutations((record) => {
diff --git a/src/routes/safe/store/actions/processTransaction.ts b/src/routes/safe/store/actions/processTransaction.ts
index 1d9556db..a1bc4f47 100644
--- a/src/routes/safe/store/actions/processTransaction.ts
+++ b/src/routes/safe/store/actions/processTransaction.ts
@@ -13,12 +13,14 @@ import fetchTransactions from 'src/routes/safe/store/actions/transactions/fetchT
 import {
   isCancelTransaction,
   mockTransaction,
+  TxToMock,
 } from 'src/routes/safe/store/actions/transactions/utils/transactionHelpers'
 import { getLastTx, getNewTxNonce, shouldExecuteTransaction } from 'src/routes/safe/store/actions/utils'
 
 import { getErrorMessage } from 'src/test/utils/ethereumErrors'
 import { makeConfirmation } from '../models/confirmation'
 import { storeTx } from './createTransaction'
+import { TransactionStatus } from '../models/types/transaction'
 
 const processTransaction = ({
   approveAndExecute,
@@ -101,7 +103,7 @@ const processTransaction = ({
       sendParams.gas = '7000000'
     }
 
-    const txToMock = {
+    const txToMock: TxToMock = {
       ...txArgs,
       confirmations: [], // this is used to determine if a tx is pending or not. See `calculateTransactionStatus` helper
       value: txArgs.valueInWei,
@@ -165,11 +167,15 @@ const processTransaction = ({
                 .set('isSuccessful', receipt.status)
                 .set(
                   'status',
-                  receipt.status ? (isCancelTransaction(record, safeAddress) ? 'cancelled' : 'success') : 'failed',
+                  receipt.status
+                    ? isCancelTransaction(record, safeAddress)
+                      ? TransactionStatus.CANCELLED
+                      : TransactionStatus.SUCCESS
+                    : TransactionStatus.FAILED,
                 )
                 .updateIn(['ownersWithPendingActions', 'reject'], (prev) => prev.clear())
             })
-          : mockedTx.set('status', 'awaiting_confirmations')
+          : mockedTx.set('status', TransactionStatus.AWAITING_CONFIRMATIONS)
 
         await storeTx(
           toStoreTx.withMutations((record) => {
diff --git a/src/routes/safe/store/actions/transactions/fetchTransactions/loadOutgoingTransactions.ts b/src/routes/safe/store/actions/transactions/fetchTransactions/loadOutgoingTransactions.ts
index 409453f8..9b2f8000 100644
--- a/src/routes/safe/store/actions/transactions/fetchTransactions/loadOutgoingTransactions.ts
+++ b/src/routes/safe/store/actions/transactions/fetchTransactions/loadOutgoingTransactions.ts
@@ -7,14 +7,18 @@ import { PROVIDER_REDUCER_ID } from 'src/logic/wallets/store/reducer/provider'
 import { buildTx, isCancelTransaction } from 'src/routes/safe/store/actions/transactions/utils/transactionHelpers'
 import { SAFE_REDUCER_ID } from 'src/routes/safe/store/reducer/safe'
 import { store } from 'src/store'
-import { DecodedMethods } from 'src/logic/contracts/methodIds'
+import { DataDecoded } from 'src/logic/contracts/methodIds'
 import fetchTransactions from 'src/routes/safe/store/actions/transactions/fetchTransactions/fetchTransactions'
-import { TransactionTypes } from 'src/routes/safe/store/models/types/transaction'
+import { Transaction, TransactionTypes } from 'src/routes/safe/store/models/types/transaction'
+import { Token } from 'src/logic/tokens/store/model/token'
+import { SafeRecord } from 'src/routes/safe/store/models/safe'
 
 export type ConfirmationServiceModel = {
+  confirmationType: string
   owner: string
-  submissionDate: Date
+  submissionDate: string
   signature: string
+  signatureType: string
   transactionHash: string
 }
 
@@ -22,25 +26,32 @@ export type TxServiceModel = {
   baseGas: number
   blockNumber?: number | null
   confirmations: ConfirmationServiceModel[]
+  confirmationsRequired: number
   creationTx?: boolean | null
   data?: string | null
-  dataDecoded?: DecodedMethods
+  dataDecoded?: DataDecoded
+  ethGasPrice: string
   executionDate?: string | null
   executor: string
-  gasPrice: number
+  fee: string
+  gasPrice: string
   gasToken: string
+  gasUsed: number
   isExecuted: boolean
   isSuccessful: boolean
+  modified: string
   nonce?: number | null
   operation: number
   origin?: string | null
   refundReceiver: string
+  safe: string
   safeTxGas: number
   safeTxHash: string
+  signatures: string
   submissionDate?: string | null
   to: string
   transactionHash?: string | null
-  value: number
+  value: string
 }
 
 export type SafeTransactionsType = {
@@ -55,8 +66,8 @@ export type OutgoingTxs = {
 
 export type BatchProcessTxsProps = OutgoingTxs & {
   currentUser?: string
-  knownTokens: any
-  safe: any
+  knownTokens: Record<string, Token>
+  safe: SafeRecord
 }
 
 /**
@@ -127,8 +138,8 @@ const batchProcessOutgoingTransactions = async ({
   outgoingTxs,
   safe,
 }: BatchProcessTxsProps): Promise<{
-  cancel: any
-  outgoing: any
+  cancel: Record<string, Transaction>
+  outgoing: Array<Transaction>
 }> => {
   // cancellation transactions
   const cancelTxsValues = Object.values(cancellationTxs)
diff --git a/src/routes/safe/store/actions/transactions/utils/transactionHelpers.ts b/src/routes/safe/store/actions/transactions/utils/transactionHelpers.ts
index dae640a1..76fa16a6 100644
--- a/src/routes/safe/store/actions/transactions/utils/transactionHelpers.ts
+++ b/src/routes/safe/store/actions/transactions/utils/transactionHelpers.ts
@@ -26,18 +26,32 @@ import { TRANSACTIONS_REDUCER_ID } from 'src/routes/safe/store/reducer/transacti
 import { store } from 'src/store'
 import { safeSelector, safeTransactionsSelector } from 'src/routes/safe/store/selectors'
 import { addOrUpdateTransactions } from 'src/routes/safe/store/actions/transactions/addOrUpdateTransactions'
-import { TxServiceModel } from 'src/routes/safe/store/actions/transactions/fetchTransactions/loadOutgoingTransactions'
+import {
+  BatchProcessTxsProps,
+  TxServiceModel,
+} from 'src/routes/safe/store/actions/transactions/fetchTransactions/loadOutgoingTransactions'
 import { TypedDataUtils } from 'eth-sig-util'
+import { Token } from 'src/logic/tokens/store/model/token'
+import { ProviderRecord } from 'src/logic/wallets/store/model/provider'
+import { SafeRecord } from 'src/routes/safe/store/models/safe'
 
 export const isEmptyData = (data?: string | null): boolean => {
   return !data || data === EMPTY_DATA
 }
 
-export const isInnerTransaction = (tx: TxServiceModel, safeAddress: string): boolean => {
-  return sameAddress(tx.to, safeAddress) && Number(tx.value) === 0
+export const isInnerTransaction = (tx: TxServiceModel | Transaction, safeAddress: string): boolean => {
+  let isSameAddress = false
+
+  if ((tx as TxServiceModel).to !== undefined) {
+    isSameAddress = sameAddress((tx as TxServiceModel).to, safeAddress)
+  } else if ((tx as Transaction).recipient !== undefined) {
+    isSameAddress = sameAddress((tx as Transaction).recipient, safeAddress)
+  }
+
+  return isSameAddress && Number(tx.value) === 0
 }
 
-export const isCancelTransaction = (tx: TxServiceModel, safeAddress: string): boolean => {
+export const isCancelTransaction = (tx: TxServiceModel | Transaction, safeAddress: string): boolean => {
   return isInnerTransaction(tx, safeAddress) && isEmptyData(tx.data)
 }
 
@@ -70,7 +84,7 @@ export const isCustomTransaction = async (
   tx: TxServiceModel,
   txCode: string,
   safeAddress: string,
-  knownTokens: any,
+  knownTokens: Record<string, Token>,
 ): Promise<boolean> => {
   return (
     isOutgoingTransaction(tx, safeAddress) &&
@@ -81,12 +95,13 @@ export const isCustomTransaction = async (
 }
 
 export const getRefundParams = async (
-  tx: any,
+  tx: TxServiceModel,
   tokenInfo: (string) => Promise<{ decimals: number; symbol: string } | null>,
 ): Promise<any> => {
+  const txGasPrice = Number(tx.gasPrice)
   let refundParams = null
 
-  if (tx.gasPrice > 0) {
+  if (txGasPrice > 0) {
     let refundSymbol = 'ETH'
     let refundDecimals = 18
 
@@ -99,7 +114,9 @@ export const getRefundParams = async (
       }
     }
 
-    const feeString = (tx.gasPrice * (tx.baseGas + tx.safeTxGas)).toString().padStart(refundDecimals, '0')
+    const feeString = (txGasPrice * (Number(tx.baseGas) + Number(tx.safeTxGas)))
+      .toString()
+      .padStart(refundDecimals, '0')
     const whole = feeString.slice(0, feeString.length - refundDecimals) || '0'
     const fraction = feeString.slice(feeString.length - refundDecimals)
 
@@ -114,18 +131,15 @@ export const getRefundParams = async (
 
 export const getDecodedParams = (tx: TxServiceModel): DecodedMethods => {
   if (tx.dataDecoded) {
-    return Object.keys(tx.dataDecoded).reduce((acc, key) => {
-      acc[key] = {
-        ...tx.dataDecoded[key].reduce(
-          (acc, param) => ({
-            ...acc,
-            [param.name]: param.value,
-          }),
-          {},
-        ),
-      }
-      return acc
-    }, {})
+    return {
+      [tx.dataDecoded.method]: tx.dataDecoded.parameters.reduce(
+        (acc, param) => ({
+          ...acc,
+          [param.name]: param.value,
+        }),
+        {},
+      ),
+    }
   }
   return null
 }
@@ -159,7 +173,7 @@ export const isTransactionCancelled = (
 
 export const calculateTransactionStatus = (
   tx: Transaction,
-  { owners, threshold }: any,
+  { owners, threshold }: SafeRecord,
   currentUser?: string | null,
 ): TransactionStatusValues => {
   let txStatus
@@ -212,6 +226,11 @@ export const calculateTransactionType = (tx: Transaction): TransactionTypeValues
   return txType
 }
 
+export type BuildTx = BatchProcessTxsProps & {
+  tx: TxServiceModel
+  txCode: string | null
+}
+
 export const buildTx = async ({
   cancellationTxs,
   currentUser,
@@ -220,7 +239,7 @@ export const buildTx = async ({
   safe,
   tx,
   txCode,
-}): Promise<Transaction> => {
+}: BuildTx): Promise<Transaction> => {
   const safeAddress = safe.address
   const isModifySettingsTx = isModifySettingsTransaction(tx, safeAddress)
   const isTxCancelled = isTransactionCancelled(tx, outgoingTxs, cancellationTxs)
@@ -235,7 +254,7 @@ export const buildTx = async ({
   const confirmations = getConfirmations(tx)
   const { decimals = 18, symbol = 'ETH' } = isSendERC20Tx ? await getERC20DecimalsAndSymbol(tx.to) : {}
 
-  const txToStore: Transaction = makeTransaction({
+  const txToStore = makeTransaction({
     baseGas: tx.baseGas,
     blockNumber: tx.blockNumber,
     cancelled: isTxCancelled,
@@ -276,7 +295,13 @@ export const buildTx = async ({
     .set('type', calculateTransactionType(txToStore))
 }
 
-export const mockTransaction = (tx, safeAddress: string, state): Promise<any> => {
+export type TxToMock = TxArgs & {
+  confirmations: []
+  safeTxHash: string
+  value: string
+}
+
+export const mockTransaction = (tx: TxToMock, safeAddress: string, state): Promise<Transaction> => {
   const submissionDate = new Date().toISOString()
 
   const transactionStructure: TxServiceModel = {
@@ -301,8 +326,8 @@ export const mockTransaction = (tx, safeAddress: string, state): Promise<any> =>
     ...tx,
   }
 
-  const knownTokens = state[TOKEN_REDUCER_ID]
-  const safe = state[SAFE_REDUCER_ID].getIn([SAFE_REDUCER_ID, safeAddress])
+  const knownTokens: Record<string, Token> = state[TOKEN_REDUCER_ID]
+  const safe: SafeRecord = state[SAFE_REDUCER_ID].getIn([SAFE_REDUCER_ID, safeAddress])
   const cancellationTxs = state[CANCELLATION_TRANSACTIONS_REDUCER_ID].get(safeAddress) || Map()
   const outgoingTxs = state[TRANSACTIONS_REDUCER_ID].get(safeAddress) || List()
 
@@ -317,7 +342,7 @@ export const mockTransaction = (tx, safeAddress: string, state): Promise<any> =>
   })
 }
 
-export const updateStoredTransactionsStatus = (dispatch, walletRecord): void => {
+export const updateStoredTransactionsStatus = (dispatch: (any) => void, walletRecord: ProviderRecord): void => {
   const state = store.getState()
   const safe = safeSelector(state)
 
@@ -351,7 +376,8 @@ export function generateSafeTxHash(safeAddress: string, txArgs: TxArgs): string
       { type: 'uint256', name: 'nonce' },
     ],
   }
-  const primaryType = 'SafeTx' as const
+
+  const primaryType: 'SafeTx' = 'SafeTx' as const
 
   const typedData = {
     types: messageTypes,
diff --git a/src/routes/safe/store/models/safe.ts b/src/routes/safe/store/models/safe.ts
index 72064803..40eb1621 100644
--- a/src/routes/safe/store/models/safe.ts
+++ b/src/routes/safe/store/models/safe.ts
@@ -1,6 +1,25 @@
-import { List, Map, Record, Set } from 'immutable'
+import { List, Map, Record, RecordOf, Set } from 'immutable'
 
-const SafeRecord = Record({
+export type SafeRecordProps = {
+  name: string
+  address: string
+  threshold: number
+  ethBalance: number
+  owners: List<{ name: string; address: string }>
+  activeTokens: Set<string>
+  activeAssets: Set<string>
+  blacklistedTokens: Set<string>
+  blacklistedAssets: Set<string>
+  balances: Map<string, string>
+  nonce: number
+  latestIncomingTxBlock: number
+  recurringUser?: boolean
+  currentVersion: string
+  needsUpdate: boolean
+  featuresEnabled: Array<string>
+}
+
+const makeSafe = Record<SafeRecordProps>({
   name: '',
   address: '',
   threshold: 0,
@@ -19,4 +38,6 @@ const SafeRecord = Record({
   featuresEnabled: [],
 })
 
-export default SafeRecord
+export type SafeRecord = RecordOf<SafeRecordProps>
+
+export default makeSafe
diff --git a/src/routes/safe/store/models/transaction.ts b/src/routes/safe/store/models/transaction.ts
index 214fd111..4db6cb0e 100644
--- a/src/routes/safe/store/models/transaction.ts
+++ b/src/routes/safe/store/models/transaction.ts
@@ -2,8 +2,8 @@ import { List, Map, Record } from 'immutable'
 
 import { ZERO_ADDRESS } from 'src/logic/wallets/ethAddresses'
 import {
-  TransactionProps,
   PendingActionType,
+  TransactionProps,
   TransactionStatus,
   TransactionTypes,
 } from 'src/routes/safe/store/models/types/transaction'
@@ -24,7 +24,7 @@ export const makeTransaction = Record<TransactionProps>({
   executionTxHash: undefined,
   executor: '',
   factoryAddress: '',
-  gasPrice: 0,
+  gasPrice: '0',
   gasToken: ZERO_ADDRESS,
   isCancellationTx: false,
   isCollectibleTransfer: false,
diff --git a/src/routes/safe/store/models/types/transaction.ts b/src/routes/safe/store/models/types/transaction.ts
index 83c7bd9c..83815f60 100644
--- a/src/routes/safe/store/models/types/transaction.ts
+++ b/src/routes/safe/store/models/types/transaction.ts
@@ -1,3 +1,7 @@
+import { List, Map, RecordOf } from 'immutable'
+import { DecodedMethods } from 'src/logic/contracts/methodIds'
+import { Confirmation } from './confirmation'
+
 export enum TransactionTypes {
   INCOMING = 'incoming',
   OUTGOING = 'outgoing',
@@ -32,19 +36,19 @@ export type TransactionProps = {
   baseGas: number
   blockNumber?: number | null
   cancelled?: boolean
-  confirmations: import('immutable').List<any>
+  confirmations: List<Confirmation>
   created: boolean
   creator: string
   creationTx: boolean
   customTx: boolean
   data?: string | null
   decimals?: (number | string) | null
-  decodedParams: import('src/logic/contracts/methodIds').DecodedMethods
+  decodedParams: DecodedMethods
   executionDate?: string | null
   executionTxHash?: string | null
   executor: string
   factoryAddress: string
-  gasPrice: number
+  gasPrice: string
   gasToken: string
   isCancellationTx: boolean
   isCollectibleTransfer: boolean
@@ -58,7 +62,7 @@ export type TransactionProps = {
   nonce?: number | null
   operation: number
   origin: string | null
-  ownersWithPendingActions: import('immutable').Map<PendingActionValues, import('immutable').List<any>>
+  ownersWithPendingActions: Map<PendingActionValues, List<any>>
   recipient: string
   refundParams: any
   refundReceiver: string
@@ -68,26 +72,26 @@ export type TransactionProps = {
   status?: TransactionStatus
   submissionDate?: string | null
   symbol?: string | null
-  transactionHash: string
+  transactionHash: string | null
   type: TransactionTypes
   upgradeTx: boolean
   value: string
 }
 
-export type Transaction = import('immutable').RecordOf<TransactionProps>
+export type Transaction = RecordOf<TransactionProps>
 
 export type TxArgs = {
-  data: any
   baseGas: number
+  data?: string | null
+  gasPrice: string
   gasToken: string
-  safeInstance: any
   nonce: number
-  valueInWei: any
-  safeTxGas: number
+  operation: number
   refundReceiver: string
-  sender: any
+  safeInstance: any
+  safeTxGas: number
+  sender?: string
   sigs: string
-  to: any
-  operation: any
-  gasPrice: number
+  to: string
+  valueInWei: string
 }
diff --git a/src/routes/safe/store/reducer/safe.ts b/src/routes/safe/store/reducer/safe.ts
index 45323c04..73e9c55e 100644
--- a/src/routes/safe/store/reducer/safe.ts
+++ b/src/routes/safe/store/reducer/safe.ts
@@ -12,7 +12,7 @@ import { SET_DEFAULT_SAFE } from 'src/routes/safe/store/actions/setDefaultSafe'
 import { SET_LATEST_MASTER_CONTRACT_VERSION } from 'src/routes/safe/store/actions/setLatestMasterContractVersion'
 import { UPDATE_SAFE } from 'src/routes/safe/store/actions/updateSafe'
 import { makeOwner } from 'src/routes/safe/store/models/owner'
-import SafeRecord from 'src/routes/safe/store/models/safe'
+import makeSafe from 'src/routes/safe/store/models/safe'
 import { checksumAddress } from 'src/utils/checksumAddress'
 
 export const SAFE_REDUCER_ID = 'safes'
@@ -74,7 +74,7 @@ export default handleActions(
         return state.updateIn([SAFE_REDUCER_ID, safe.address], (prevSafe) => prevSafe.merge(safe))
       }
 
-      return state.setIn([SAFE_REDUCER_ID, safe.address], SafeRecord(safe))
+      return state.setIn([SAFE_REDUCER_ID, safe.address], makeSafe(safe))
     },
     [REMOVE_SAFE]: (state, action) => {
       const safeAddress = action.payload
diff --git a/src/test/builder/safe.redux.builder.ts b/src/test/builder/safe.redux.builder.ts
index f7efb91c..a6b6e50a 100644
--- a/src/test/builder/safe.redux.builder.ts
+++ b/src/test/builder/safe.redux.builder.ts
@@ -1,7 +1,5 @@
-// 
-/* eslint-disable max-classes-per-file */
-import SafeRecord, { } from 'src/routes/safe/store/models/safe'
-import addSafe, { buildOwnersFrom } from 'src/routes/safe/store/actions/addSafe'
+import makeSafe from 'src/routes/safe/store/models/safe'
+import { buildOwnersFrom } from 'src/routes/safe/store/actions/addSafe'
 import {
   FIELD_NAME,
   FIELD_CONFIRMATIONS,
@@ -11,7 +9,6 @@ import {
 } from 'src/routes/open/components/fields'
 import { getWeb3, getProviderInfo } from 'src/logic/wallets/getWeb3'
 import { createSafe, } from 'src/routes/open/container/Open'
-import { } from 'src/store/index'
 import { makeProvider } from 'src/logic/wallets/store/model/provider'
 import addProvider from 'src/logic/wallets/store/actions/addProvider'
 
@@ -19,7 +16,7 @@ class SafeBuilder {
   safe
 
   constructor() {
-    this.safe = SafeRecord()
+    this.safe = makeSafe()
   }
 
   withAddress(address) {
@@ -90,7 +87,7 @@ export const aMinedSafe = async (
     form[getOwnerNameBy(i)] = `Adol ${i + 1} Eth Account`
     form[getOwnerAddressBy(i)] = accounts[i]
   }
-  
+
   const openSafeProps = await createSafe(form, accounts[0])
 
   return openSafeProps.safeAddress
diff --git a/src/test/utils/safeHelper.ts b/src/test/utils/safeHelper.ts
index af091c18..8f34e51e 100644
--- a/src/test/utils/safeHelper.ts
+++ b/src/test/utils/safeHelper.ts
@@ -1,4 +1,4 @@
-// 
+//
 import { } from 'react-router-dom'
 import { buildMatchPropsFrom } from 'src/test/utils/buildReactRouterProps'
 import { safeSelector } from 'src/routes/safe/store/selectors/index'