diff --git a/cspell.json b/cspell.json
index 52c87c7ab5f..409710d0e12 100644
--- a/cspell.json
+++ b/cspell.json
@@ -255,6 +255,7 @@
         "cashtags",
         "celo",
         "endregion",
+        "frameable",
         "Hrefs",
         "linkedin",
         "luma",
diff --git a/packages/plugins/Transak/src/SiteAdaptor/BuyTokenDialog.tsx b/packages/plugins/Transak/src/SiteAdaptor/BuyTokenDialog.tsx
index 3e66d74e180..df0ab09d37d 100644
--- a/packages/plugins/Transak/src/SiteAdaptor/BuyTokenDialog.tsx
+++ b/packages/plugins/Transak/src/SiteAdaptor/BuyTokenDialog.tsx
@@ -1,8 +1,8 @@
 import { InjectedDialog } from '@masknet/shared'
-import { DialogContent, IconButton } from '@mui/material'
-import { makeStyles } from '@masknet/theme'
 import { Close as CloseIcon } from '@mui/icons-material'
-import { useTransakURL } from '../hooks/useTransakURL.js'
+import { DialogContent, IconButton, Stack, Typography } from '@mui/material'
+import { LoadingBase, makeStyles } from '@masknet/theme'
+import { useTransakWidgetURL } from '../hooks/useTransakWidgetURL.js'
 
 const useStyles = makeStyles()((theme) => ({
     dialogPaper: {
@@ -37,6 +37,11 @@ const useStyles = makeStyles()((theme) => ({
         border: 0,
         borderRadius: 12,
     },
+    status: {
+        height: 630,
+        padding: theme.spacing(2),
+        boxSizing: 'border-box',
+    },
 }))
 
 interface BuyTokenDialogProps extends withClasses<'root'> {
@@ -50,7 +55,11 @@ export function BuyTokenDialog(props: BuyTokenDialogProps) {
     const { classes } = useStyles(undefined, { props })
     const { code, address, open, onClose } = props
 
-    const transakURL = useTransakURL({
+    const {
+        data: widgetUrl,
+        isLoading: loading,
+        error,
+    } = useTransakWidgetURL({
         defaultCryptoCurrency: code,
         walletAddress: address,
     })
@@ -69,10 +78,18 @@ export function BuyTokenDialog(props: BuyTokenDialogProps) {
                     <IconButton className={classes.close} size="small" onClick={onClose}>
                         <CloseIcon />
                     </IconButton>
-                    {transakURL ?
+                    {loading ?
+                        <Stack className={classes.status} alignItems="center" justifyContent="center">
+                            <LoadingBase size={36} />
+                        </Stack>
+                    : error || !widgetUrl ?
+                        <Stack className={classes.status} alignItems="center" justifyContent="center">
+                            <Typography variant="body1">
+                                Transak is temporarily unavailable. Please try again later.
+                            </Typography>
+                        </Stack>
                         // eslint-disable-next-line react/dom/no-missing-iframe-sandbox
-                        <iframe className={classes.frame} src={transakURL} />
-                    :   null}
+                    :   <iframe className={classes.frame} src={widgetUrl} allow="camera;microphone;payment" />}
                 </DialogContent>
             </InjectedDialog>
         </div>
diff --git a/packages/plugins/Transak/src/constants.ts b/packages/plugins/Transak/src/constants.ts
index 81abfce878d..56c48b7b44d 100644
--- a/packages/plugins/Transak/src/constants.ts
+++ b/packages/plugins/Transak/src/constants.ts
@@ -3,6 +3,9 @@ import { PluginID } from '@masknet/shared-base'
 export const TRANSAK_API_KEY_PRODUCTION = '253be1f0-c6d8-46e7-9d80-38f33bf973e2'
 export const TRANSAK_API_KEY_STAGING = '4fcd6904-706b-4aff-bd9d-77422813bbb7'
 
+// Worker that mints a Transak session widgetUrl (the bare apiKey URL is no longer frameable).
+export const TRANSAK_PROXY_HOST = 'https://transak-proxy.r2d2.to'
+
 export const PLUGIN_ID = PluginID.Transak
 export const PLUGIN_NAME = 'Transak'
 export const PLUGIN_DESCRIPTION = 'The Fiat On-Ramp Aggregator on Mask Network.'
diff --git a/packages/plugins/Transak/src/hooks/useTransakURL.ts b/packages/plugins/Transak/src/hooks/useTransakURL.ts
index 187ad836875..56cf5c22661 100644
--- a/packages/plugins/Transak/src/hooks/useTransakURL.ts
+++ b/packages/plugins/Transak/src/hooks/useTransakURL.ts
@@ -1,5 +1,5 @@
 import { useMemo } from 'react'
-import { rgbToHex, useTheme } from '@mui/material'
+import { rgbToHex, useTheme, type Theme } from '@mui/material'
 import { TRANSAK_API_KEY_PRODUCTION, TRANSAK_API_KEY_STAGING } from '../constants.js'
 import { formatEthereumAddress } from '@masknet/web3-shared-evm'
 import type { TransakConfig } from '../types.js'
@@ -23,20 +23,30 @@ const DEFAULT_PARAMETERS: TransakConfig = {
     excludeFiatCurrencies: 'KRW',
 }
 
+// Query params shared by the legacy direct URL and the session proxy.
+export function buildTransakSearchParams(config?: Partial<TransakConfig>, theme?: Theme): URLSearchParams {
+    const config_: TransakConfig = {
+        ...DEFAULT_PARAMETERS,
+        referrerDomain: location.origin,
+        themeColor: theme ? rgbToHex(theme.palette.maskColor.dark).slice(1) : undefined,
+        exchangeScreenTitle:
+            config?.walletAddress ? `Buy Crypto to ${formatEthereumAddress(config.walletAddress, 4)}` : undefined,
+        ...config,
+    }
+    const params = new URLSearchParams()
+    Object.entries(config_).forEach(([key, value]) => {
+        if (value === undefined || value === null) return
+        params.append(key, String(value))
+    })
+    return params
+}
+
 export function useTransakURL(config?: Partial<TransakConfig>) {
     const theme = useTheme()
-    const search = useMemo(() => {
-        const config_: TransakConfig = {
-            ...DEFAULT_PARAMETERS,
-            themeColor: rgbToHex(theme.palette.maskColor.dark).slice(1),
-            exchangeScreenTitle:
-                config?.walletAddress ? `Buy Crypto to ${formatEthereumAddress(config.walletAddress, 4)}` : void 0,
-            ...config,
-        }
-        const params = new URLSearchParams()
-        Object.entries(config_).forEach(([key, value = '']) => params.append(key, String(value)))
-        return params.toString()
+    const search = useMemo(
+        () => buildTransakSearchParams(config, theme).toString(),
         // eslint-disable-next-line react-compiler/react-compiler
-    }, [theme.palette.primary.main, JSON.stringify(config)])
+        [theme.palette.primary.main, JSON.stringify(config)],
+    )
     return `${HOST_MAP[process.env.NODE_ENV]}?${search}`
 }
diff --git a/packages/plugins/Transak/src/hooks/useTransakWidgetURL.ts b/packages/plugins/Transak/src/hooks/useTransakWidgetURL.ts
new file mode 100644
index 00000000000..d4986b3e47a
--- /dev/null
+++ b/packages/plugins/Transak/src/hooks/useTransakWidgetURL.ts
@@ -0,0 +1,30 @@
+import { useMemo } from 'react'
+import { useTheme } from '@mui/material'
+import { useQuery } from '@tanstack/react-query'
+import { TRANSAK_PROXY_HOST } from '../constants.js'
+import type { TransakConfig } from '../types.js'
+import { buildTransakSearchParams } from './useTransakURL.js'
+
+// Fetches a single-use, iframe-safe widgetUrl from the session proxy.
+export function useTransakWidgetURL(config?: Partial<TransakConfig>) {
+    const theme = useTheme()
+    const url = useMemo(
+        () => `${TRANSAK_PROXY_HOST}?${buildTransakSearchParams(config, theme).toString()}`,
+        // eslint-disable-next-line react-compiler/react-compiler
+        [theme.palette.primary.main, JSON.stringify(config)],
+    )
+    return useQuery({
+        queryKey: ['transak', 'widget-url', url],
+        queryFn: async () => {
+            const res = await fetch(url)
+            if (!res.ok) throw new Error('Failed to create a Transak session')
+            const json = (await res.json()) as { data?: { widgetUrl?: string } }
+            const widgetUrl = json.data?.widgetUrl
+            if (!widgetUrl) throw new Error('Transak session did not return a widget URL')
+            return widgetUrl
+        },
+        // widgetUrl is single-use (one sessionId, 5 min) — fetch once per open, never refetch or reuse.
+        staleTime: Infinity,
+        gcTime: 0,
+    })
+}
diff --git a/packages/plugins/Transak/src/index.ts b/packages/plugins/Transak/src/index.ts
index 32e1bfa4460..20b28c4ef4d 100644
--- a/packages/plugins/Transak/src/index.ts
+++ b/packages/plugins/Transak/src/index.ts
@@ -1,3 +1,4 @@
 export { PluginTransakMessages } from './messages.js'
 export { useTransakAllowanceCoin } from './hooks/useTransakAllowanceCoin.js'
 export { useTransakURL } from './hooks/useTransakURL.js'
+export { useTransakWidgetURL } from './hooks/useTransakWidgetURL.js'
diff --git a/packages/plugins/Transak/src/types.ts b/packages/plugins/Transak/src/types.ts
index 0cbaa6ead37..8faedcbf5e1 100644
--- a/packages/plugins/Transak/src/types.ts
+++ b/packages/plugins/Transak/src/types.ts
@@ -6,6 +6,7 @@ export interface TransakConfig {
     defaultFiatAmount?: number
     defaultCryptoCurrency?: string
     walletAddress?: string
+    referrerDomain?: string
     themeColor?: string
     countryCode?: string
     fiatCurrency?: string