diff --git a/apps/laboratory/src/components/AddTransactionModal.tsx b/apps/laboratory/src/components/AddTransactionModal.tsx
index cf4fb55555..81a50f7292 100644
--- a/apps/laboratory/src/components/AddTransactionModal.tsx
+++ b/apps/laboratory/src/components/AddTransactionModal.tsx
@@ -3,6 +3,9 @@ import { useState } from 'react'
 import {
   Box,
   Button,
+  FormControl,
+  FormHelperText,
+  FormLabel,
   Input,
   Modal,
   ModalBody,
@@ -10,7 +13,8 @@ import {
   ModalContent,
   ModalFooter,
   ModalHeader,
-  ModalOverlay
+  ModalOverlay,
+  Tooltip
 } from '@chakra-ui/react'
 import { ethers } from 'ethers'
 
@@ -19,12 +23,24 @@ import { useChakraToast } from './Toast'
 type IAddTransactionModalProps = {
   isOpen: boolean
   onClose: () => void
-  onSubmit: (params: { eth: string; to: string }) => void
+  onSubmit: (params: { eth: string; to: string; data?: string }) => void
 }
 export function AddTransactionModal({ isOpen, onClose, onSubmit }: IAddTransactionModalProps) {
   const toast = useChakraToast()
   const [eth, setEth] = useState(0)
   const [to, setTo] = useState('')
+  const [data, setData] = useState('')
+  const [mode, setMode] = useState<'simple' | 'advanced'>('simple')
+
+  function isValidHex(value: string): boolean {
+    // Empty is valid (optional field)
+    if (!value) {
+      return true
+    }
+
+    return /^0x[0-9a-fA-F]*$/u.test(value)
+  }
+
   function onAddTransaction() {
     if (!ethers.isAddress(to)) {
       toast({
@@ -44,7 +60,16 @@ export function AddTransactionModal({ isOpen, onClose, onSubmit }: IAddTransacti
 
       return
     }
-    onSubmit({ eth: eth.toString(), to })
+    if (data && !isValidHex(data)) {
+      toast({
+        title: 'Error',
+        description: 'Invalid hex data format. Must start with 0x',
+        type: 'error'
+      })
+
+      return
+    }
+    onSubmit({ eth: eth.toString(), to, data: data || undefined })
     reset()
     onClose()
   }
@@ -52,6 +77,8 @@ export function AddTransactionModal({ isOpen, onClose, onSubmit }: IAddTransacti
   function reset() {
     setEth(0)
     setTo('')
+    setData('')
+    setMode('simple')
   }
 
   return (
@@ -64,21 +91,66 @@ export function AddTransactionModal({ isOpen, onClose, onSubmit }: IAddTransacti
           <ModalBody>
             Transactions will be batched and sent together to your wallet for approval
             <Box mt={4}>
-              <label>Amount ETH</label>
+              <Button
+                size="sm"
+                variant="outline"
+                onClick={() => setMode(mode === 'simple' ? 'advanced' : 'simple')}
+                mb={4}
+              >
+                {mode === 'simple' ? 'Switch to Advanced Mode' : 'Switch to Simple Mode'}
+              </Button>
+            </Box>
+            <FormControl mt={4}>
+              <FormLabel>
+                <Tooltip label="The amount of ETH to send in the transaction" placement="top">
+                  Amount ETH
+                </Tooltip>
+              </FormLabel>
               <Input
                 placeholder="0.001"
                 type="number"
+                value={eth || ''}
                 onChange={event => setEth(event.target.valueAsNumber)}
               />
-            </Box>
-            <Box mt={4}>
-              <label>To</label>
+              <FormHelperText>Amount in ETH (e.g., 0.001)</FormHelperText>
+            </FormControl>
+            <FormControl mt={4}>
+              <FormLabel>
+                <Tooltip label="The recipient address for this transaction" placement="top">
+                  To Address
+                </Tooltip>
+              </FormLabel>
               <Input
                 placeholder="0x0..."
                 type="text"
+                value={to}
                 onChange={event => setTo(event.target.value)}
               />
-            </Box>
+              <FormHelperText>Recipient Ethereum address</FormHelperText>
+            </FormControl>
+            {mode === 'advanced' && (
+              <FormControl mt={4}>
+                <FormLabel>
+                  <Tooltip
+                    label="Optional transaction data as hex string (e.g., contract call data)"
+                    placement="top"
+                  >
+                    Data (Optional)
+                  </Tooltip>
+                </FormLabel>
+                <Input
+                  placeholder="0x..."
+                  type="text"
+                  value={data}
+                  onChange={event => setData(event.target.value)}
+                  isInvalid={data !== '' && !isValidHex(data)}
+                />
+                <FormHelperText>
+                  Hex-encoded transaction data (must start with 0x). Leave empty for simple
+                  transfers.
+                </FormHelperText>
+              </FormControl>
+            )}
           </ModalBody>
           <ModalFooter>
             <Button variant="ghost" mr={3} onClick={onClose}>
diff --git a/apps/laboratory/src/components/Ethers/EthersSendCallsTest.tsx b/apps/laboratory/src/components/Ethers/EthersSendCallsTest.tsx
index 861bd09c1e..61762a8b4c 100644
--- a/apps/laboratory/src/components/Ethers/EthersSendCallsTest.tsx
+++ b/apps/laboratory/src/components/Ethers/EthersSendCallsTest.tsx
@@ -37,9 +37,9 @@ export function EthersSendCallsTest({
   const { chainId } = useAppKitNetwork()
   const { address, isConnected } = useAppKitAccount({ namespace: 'eip155' })
   const { walletProvider } = useAppKitProvider<Eip1193Provider>('eip155')
-  const [transactionsToBatch, setTransactionsToBatch] = useState<{ value: string; to: string }[]>(
-    []
-  )
+  const [transactionsToBatch, setTransactionsToBatch] = useState<
+    { value: string; to: string; data?: string }[]
+  >([])
   const { isMethodSupported } = useEthersActiveCapabilities()
   const { isSupported, currentChainsInfo, supportedChains, supportedChainsName } = useCapabilities({
     capabilities,
@@ -49,13 +49,13 @@ export function EthersSendCallsTest({
   const toast = useChakraToast()
 
   const [isOpen, setIsOpen] = useState(false)
-  function onSubmit(args: { to: string; eth: string }) {
+  function onSubmit(args: { to: string; eth: string; data?: string }) {
     setLastCallsBatchId(null)
     setTransactionsToBatch(prev => [
       ...prev,
       {
         to: args.to as Address,
-        data: '0x' as Hex,
+        data: (args.data || '0x') as Hex,
         value: `0x${parseGwei(args.eth).toString(16)}`
       }
     ])
@@ -176,6 +176,9 @@ export function EthersSendCallsTest({
                         </StatLabel>
                         <StatNumber>{parseInt(tx.value, 16) / 1000000000} ETH</StatNumber>
                         <StatHelpText>to {tx.to}</StatHelpText>
+                        {tx.data && tx.data !== '0x' && (
+                          <StatHelpText>data: {tx.data}</StatHelpText>
+                        )}
                       </Stat>
                     </CardBody>
                   </Card>{' '}
diff --git a/apps/laboratory/src/components/Ethers/EthersTransactionTest.tsx b/apps/laboratory/src/components/Ethers/EthersTransactionTest.tsx
index 91b671e46b..d64f1e7cd5 100644
--- a/apps/laboratory/src/components/Ethers/EthersTransactionTest.tsx
+++ b/apps/laboratory/src/components/Ethers/EthersTransactionTest.tsx
@@ -1,5 +1,6 @@
 import { useState } from 'react'
 
+import { AddIcon } from '@chakra-ui/icons'
 import { Button, Link, Spacer, Stack, Text } from '@chakra-ui/react'
 import { BrowserProvider, JsonRpcSigner, ethers } from 'ethers'
 
@@ -11,6 +12,7 @@ import {
   useAppKitProvider
 } from '@reown/appkit/react'
 
+import { AddTransactionModal } from '@/src/components/AddTransactionModal'
 import { useChakraToast } from '@/src/components/Toast'
 import { vitalikEthAddress } from '@/src/utils/DataUtil'
 
@@ -20,6 +22,12 @@ export function EthersTransactionTest() {
   const { address } = useAppKitAccount({ namespace: 'eip155' })
   const { walletProvider } = useAppKitProvider<Provider>('eip155')
   const [isLoading, setIsLoading] = useState(false)
+  const [customTx, setCustomTx] = useState<{
+    to: string
+    value: bigint
+    data?: string
+  } | null>(null)
+  const [isModalOpen, setIsModalOpen] = useState(false)
 
   async function onSendTransaction() {
     try {
@@ -29,10 +37,13 @@ export function EthersTransactionTest() {
       }
       const provider = new BrowserProvider(walletProvider, chainId)
       const signer = new JsonRpcSigner(provider, address)
-      const tx = await signer.sendTransaction({
+
+      const txParams = customTx || {
         to: vitalikEthAddress,
         value: ethers.parseUnits('0.0001', 'gwei')
-      })
+      }
+
+      const tx = await signer.sendTransaction(txParams)
 
       toast({
         title: 'Success',
@@ -51,30 +62,70 @@ export function EthersTransactionTest() {
     }
   }
 
+  function onConfigureTransaction(params: { eth: string; to: string; data?: string }) {
+    setCustomTx({
+      to: params.to,
+      value: ethers.parseUnits(params.eth, 'gwei'),
+      data: params.data
+    })
+    setIsModalOpen(false)
+  }
+
+  function onCloseModal() {
+    setIsModalOpen(false)
+  }
+
   return chainId !== mainnet.id && address ? (
-    <Stack direction={['column', 'column', 'row']}>
-      <Button
-        data-testid="sign-transaction-button"
-        onClick={onSendTransaction}
-        isDisabled={isLoading}
-      >
-        Send Transaction to Vitalik
-      </Button>
-
-      <Spacer />
-
-      <Link isExternal href="https://sepoliafaucet.com">
-        <Button variant="outline" colorScheme="blue" isDisabled={isLoading}>
-          Sepolia Faucet 1
+    <>
+      <Stack direction={['column', 'column', 'row']}>
+        <Button
+          data-testid="sign-transaction-button"
+          onClick={onSendTransaction}
+          isDisabled={isLoading}
+        >
+          {customTx ? 'Send Custom Transaction' : 'Send Transaction to Vitalik'}
         </Button>
-      </Link>
 
-      <Link isExternal href="https://www.infura.io/faucet/sepolia">
-        <Button variant="outline" colorScheme="orange" isDisabled={isLoading}>
-          Sepolia Faucet 2
+        <Button
+          variant="outline"
+          colorScheme="blue"
+          onClick={() => setIsModalOpen(true)}
+          isDisabled={isLoading}
+        >
+          <AddIcon mr={2} /> Configure Transaction
         </Button>
-      </Link>
-    </Stack>
+
+        {customTx && (
+          <Button
+            variant="outline"
+            colorScheme="red"
+            onClick={() => setCustomTx(null)}
+            isDisabled={isLoading}
+          >
+            Reset to Default
+          </Button>
+        )}
+
+        <Spacer />
+
+        <Link isExternal href="https://sepoliafaucet.com">
+          <Button variant="outline" colorScheme="blue" isDisabled={isLoading}>
+            Sepolia Faucet 1
+          </Button>
+        </Link>
+
+        <Link isExternal href="https://www.infura.io/faucet/sepolia">
+          <Button variant="outline" colorScheme="orange" isDisabled={isLoading}>
+            Sepolia Faucet 2
+          </Button>
+        </Link>
+      </Stack>
+      <AddTransactionModal
+        isOpen={isModalOpen}
+        onSubmit={onConfigureTransaction}
+        onClose={onCloseModal}
+      />
+    </>
   ) : (
     <Text fontSize="md" color="yellow">
       Feature not enabled on Ethereum Mainnet
diff --git a/apps/laboratory/src/components/Wagmi/WagmiSendCallsTest.tsx b/apps/laboratory/src/components/Wagmi/WagmiSendCallsTest.tsx
index e8032c6761..c193e4e48b 100644
--- a/apps/laboratory/src/components/Wagmi/WagmiSendCallsTest.tsx
+++ b/apps/laboratory/src/components/Wagmi/WagmiSendCallsTest.tsx
@@ -1,13 +1,29 @@
 import { useCallback, useState } from 'react'
 
-import { Button, Heading, Stack, Text } from '@chakra-ui/react'
+import { AddIcon, DeleteIcon } from '@chakra-ui/icons'
+import {
+  Box,
+  Button,
+  Card,
+  CardBody,
+  Heading,
+  Link,
+  Spacer,
+  Stack,
+  Stat,
+  StatHelpText,
+  StatLabel,
+  StatNumber,
+  Text
+} from '@chakra-ui/react'
 import { type WalletCapabilities, parseGwei, toHex } from 'viem'
 import { useAccount } from 'wagmi'
 import { useSendCalls } from 'wagmi/experimental'
 
-import type { Address } from '@reown/appkit-common'
+import type { Address, Hex } from '@reown/appkit-common'
 import { useAppKitAccount } from '@reown/appkit/react'
 
+import { AddTransactionModal } from '@/src/components/AddTransactionModal'
 import { useChakraToast } from '@/src/components/Toast'
 import { useCapabilities } from '@/src/hooks/useCapabilities'
 import { useWagmiAvailableCapabilities } from '@/src/hooks/useWagmiActiveCapabilities'
@@ -76,6 +92,10 @@ export function WagmiSendCallsTest({ capabilities }: { capabilities: WalletCapab
 function ConnectedTestContent() {
   const toast = useChakraToast()
   const [lastCallsBatchId, setLastCallsBatchId] = useState<string | null>(null)
+  const [transactionsToBatch, setTransactionsToBatch] = useState<
+    { to: Address; value: bigint; data?: Hex }[]
+  >([])
+  const [isModalOpen, setIsModalOpen] = useState(false)
 
   const { sendCalls, isPending: isLoading } = useSendCalls({
     mutation: {
@@ -86,6 +106,7 @@ function ConnectedTestContent() {
           description: hash.id,
           type: 'success'
         })
+        setTransactionsToBatch([])
       },
       onError: () => {
         toast({
@@ -96,27 +117,105 @@ function ConnectedTestContent() {
       }
     }
   })
+
   const onSendCalls = useCallback(() => {
+    const calls = transactionsToBatch.length ? transactionsToBatch : [TEST_TX_1, TEST_TX_2]
     sendCalls({
-      calls: [TEST_TX_1, TEST_TX_2]
+      calls
     })
-  }, [sendCalls])
+  }, [sendCalls, transactionsToBatch])
+
+  function onSubmit(args: { to: string; eth: string; data?: string }) {
+    setLastCallsBatchId(null)
+    setTransactionsToBatch(prev => [
+      ...prev,
+      {
+        to: args.to as Address,
+        value: parseGwei(args.eth),
+        data: args.data as Hex | undefined
+      }
+    ])
+  }
+
+  function onClose() {
+    setIsModalOpen(false)
+  }
+
+  function onAddTransactionButtonClick() {
+    setIsModalOpen(true)
+  }
+
+  function onRemoveTransaction(index: number) {
+    setTransactionsToBatch(prev => prev.filter((_, i) => i !== index))
+  }
 
   return (
-    <Stack direction={['column', 'column', 'row']}>
-      <Button
-        data-testid="send-calls-button"
-        onClick={onSendCalls}
-        disabled={!sendCalls}
-        isDisabled={isLoading}
-        isLoading={isLoading}
-      >
-        Send Batch Calls to Vitalik
-      </Button>
-      <>
-        <Heading size="xs">Last batch call ID:</Heading>
-        <Text data-testid="send-calls-id">{lastCallsBatchId}</Text>
-      </>
-    </Stack>
+    <>
+      <Box>
+        <Stack direction={['column', 'column', 'row']}>
+          <Stack direction={['column']}>
+            {transactionsToBatch.length ? (
+              transactionsToBatch.map((tx, index) => (
+                <Box key={index}>
+                  <Card>
+                    <CardBody>
+                      <Stat>
+                        <StatLabel>
+                          ({index + 1}) Sending
+                          <DeleteIcon
+                            style={{ float: 'right', cursor: 'pointer' }}
+                            onClick={() => onRemoveTransaction(index)}
+                          />
+                        </StatLabel>
+                        <StatNumber>{Number(tx.value) / 1000000000} ETH</StatNumber>
+                        <StatHelpText>to {tx.to}</StatHelpText>
+                        {tx.data && <StatHelpText>data: {tx.data}</StatHelpText>}
+                      </Stat>
+                    </CardBody>
+                  </Card>
+                  <Spacer />
+                </Box>
+              ))
+            ) : (
+              <Button
+                data-testid="send-calls-button"
+                onClick={onSendCalls}
+                disabled={!sendCalls}
+                isDisabled={isLoading}
+                isLoading={isLoading}
+              >
+                Send Batch Calls to Vitalik
+              </Button>
+            )}
+          </Stack>
+          <Spacer />
+          <Link onClick={onAddTransactionButtonClick}>
+            <Button variant="outline" colorScheme="blue" isDisabled={isLoading}>
+              <AddIcon mr={2} /> Add Transaction
+            </Button>
+          </Link>
+        </Stack>
+        {transactionsToBatch.length ? (
+          <Button
+            data-testid="send-calls-button"
+            onClick={onSendCalls}
+            disabled={!sendCalls}
+            isDisabled={isLoading}
+            isLoading={isLoading}
+          >
+            Send Calls
+          </Button>
+        ) : null}
+      </Box>
+      <AddTransactionModal isOpen={isModalOpen} onSubmit={onSubmit} onClose={onClose} />
+
+      <Spacer m={2} />
+      {lastCallsBatchId && (
+        <>
+          <Heading size="xs">Last batch call ID:</Heading>
+          <Text data-testid="send-calls-id">{lastCallsBatchId}</Text>
+        </>
+      )}
+    </>
   )
 }
diff --git a/apps/laboratory/src/components/Wagmi/WagmiTransactionTest.tsx b/apps/laboratory/src/components/Wagmi/WagmiTransactionTest.tsx
index e6628771e1..fba44546c2 100644
--- a/apps/laboratory/src/components/Wagmi/WagmiTransactionTest.tsx
+++ b/apps/laboratory/src/components/Wagmi/WagmiTransactionTest.tsx
@@ -1,10 +1,12 @@
 import { useCallback, useState } from 'react'
 
+import { AddIcon } from '@chakra-ui/icons'
 import { Button, Link, Spacer, Stack, Text } from '@chakra-ui/react'
-import { type Address, parseGwei } from 'viem'
+import { type Address, type Hex, parseGwei } from 'viem'
 import { useAccount, useEstimateGas, useSendTransaction } from 'wagmi'
 import { mainnet } from 'wagmi/chains'
 
+import { AddTransactionModal } from '@/src/components/AddTransactionModal'
 import { useChakraToast } from '@/src/components/Toast'
 import { vitalikEthAddress } from '@/src/utils/DataUtil'
 
@@ -27,8 +29,17 @@ export function WagmiTransactionTest() {
 
 function AvailableTestContent() {
   const toast = useChakraToast()
+  const [customTx, setCustomTx] = useState<{
+    to: Address
+    value: bigint
+    data?: Hex
+  } | null>(null)
+  const [isModalOpen, setIsModalOpen] = useState(false)
+
+  const txToSend = customTx || TEST_TX
+
   const { refetch: estimateGas, isFetching: isEstimateGasFetching } = useEstimateGas({
-    ...TEST_TX,
+    ...txToSend,
     query: {
       enabled: false
     }
@@ -68,37 +79,77 @@ function AvailableTestContent() {
     } else {
       setLoading(true)
       sendTransaction({
-        ...TEST_TX,
+        ...txToSend,
         gas
       })
     }
-  }, [sendTransaction, estimateGas])
+  }, [sendTransaction, estimateGas, txToSend])
+
+  function onConfigureTransaction(params: { eth: string; to: string; data?: string }) {
+    setCustomTx({
+      to: params.to as Address,
+      value: parseGwei(params.eth),
+      data: params.data as Hex | undefined
+    })
+    setIsModalOpen(false)
+  }
+
+  function onCloseModal() {
+    setIsModalOpen(false)
+  }
 
   return (
-    <Stack direction={['column', 'column', 'row']}>
-      <Button
-        data-testid="sign-transaction-button"
-        onClick={onSendTransaction}
-        disabled={!sendTransaction}
-        isDisabled={isLoading}
-        isLoading={isEstimateGasFetching}
-      >
-        Send Transaction to Vitalik
-      </Button>
-
-      <Spacer />
-
-      <Link isExternal href="https://sepoliafaucet.com">
-        <Button variant="outline" colorScheme="blue" isDisabled={isLoading}>
-          Sepolia Faucet 1
+    <>
+      <Stack direction={['column', 'column', 'row']}>
+        <Button
+          data-testid="sign-transaction-button"
+          onClick={onSendTransaction}
+          disabled={!sendTransaction}
+          isDisabled={isLoading}
+          isLoading={isEstimateGasFetching}
+        >
+          {customTx ? 'Send Custom Transaction' : 'Send Transaction to Vitalik'}
         </Button>
-      </Link>
 
-      <Link isExternal href="https://www.infura.io/faucet/sepolia">
-        <Button variant="outline" colorScheme="orange" isDisabled={isLoading}>
-          Sepolia Faucet 2
+        <Button
+          variant="outline"
+          colorScheme="blue"
+          onClick={() => setIsModalOpen(true)}
+          isDisabled={isLoading}
+        >
+          <AddIcon mr={2} /> Configure Transaction
         </Button>
-      </Link>
-    </Stack>
+
+        {customTx && (
+          <Button
+            variant="outline"
+            colorScheme="red"
+            onClick={() => setCustomTx(null)}
+            isDisabled={isLoading}
+          >
+            Reset to Default
+          </Button>
+        )}
+
+        <Spacer />
+
+        <Link isExternal href="https://sepoliafaucet.com">
+          <Button variant="outline" colorScheme="blue" isDisabled={isLoading}>
+            Sepolia Faucet 1
+          </Button>
+        </Link>
+
+        <Link isExternal href="https://www.infura.io/faucet/sepolia">
+          <Button variant="outline" colorScheme="orange" isDisabled={isLoading}>
+            Sepolia Faucet 2
+          </Button>
+        </Link>
+      </Stack>
+      <AddTransactionModal
+        isOpen={isModalOpen}
+        onSubmit={onConfigureTransaction}
+        onClose={onCloseModal}
+      />
+    </>
   )
 }