diff --git a/package.json b/package.json
index 0dfc0150f..05c4d7d42 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "@babel/helper-builder-react-jsx-experimental": "7.12.11",
     "@cosmjs/stargate": "0.24.1",
     "@crypto-org-chain/chain-jslib": "1.0.3",
+    "@ethersproject/rlp": "^5.5.0",
     "@ledgerhq/hw-app-eth": "^6.6.0",
     "@ledgerhq/hw-transport-node-hid": "^6.6.0",
     "@ledgerhq/hw-transport-webhid": "5.48.0",
@@ -36,6 +37,7 @@
     "eth-sig-util": "3.0.1",
     "ethereumjs-tx": "2.1.2",
     "ethers": "5.4.4",
+    "fast-check": "^2.20.0",
     "i18next": "20.3.2",
     "i18next-browser-languagedetector": "6.1.2",
     "isutf8": "4.0.0",
diff --git a/src/service/signers/LedgerSigner.spec.ts b/src/service/signers/LedgerSigner.spec.ts
new file mode 100644
index 000000000..6d59d6c96
--- /dev/null
+++ b/src/service/signers/LedgerSigner.spec.ts
@@ -0,0 +1,19 @@
+import 'mocha';
+import * as fc from 'fast-check';
+import { DefaultWalletConfigs } from '../../config/StaticConfig';
+import sdk from '@crypto-org-chain/chain-jslib';
+import { Units } from '../../utils/ChainJsLib';
+import { assert } from 'console';
+
+test('should declare coin in ledger correctly', () => {
+  fc.assert(
+    // both inclusive
+    fc.property(fc.bigInt(BigInt('1'), BigInt('10000000000000000000')), coinAmount => {
+      const cro = sdk.CroSDK({ network: DefaultWalletConfigs.TestNetConfig.network });
+      const fee = new cro.Coin(coinAmount.toString(), Units.BASE);
+      assert(fee.toString() === coinAmount.toString());
+      return true;
+    }),
+    { verbose: true },
+  );
+});
diff --git a/src/service/signers/TransactionSigner.spec.ts b/src/service/signers/TransactionSigner.spec.ts
index f2003578d..018f59c53 100644
--- a/src/service/signers/TransactionSigner.spec.ts
+++ b/src/service/signers/TransactionSigner.spec.ts
@@ -1,10 +1,11 @@
 import 'mocha';
 import { expect } from 'chai';
+import * as fc from 'fast-check';
 import { DefaultWalletConfigs, WalletConfig } from '../../config/StaticConfig';
 import { TransactionSigner } from './TransactionSigner';
 import { TransactionUnsigned } from './TransactionSupported';
 import { evmTransactionSigner } from './EvmTransactionSigner';
-
+import * as RLP from '@ethersproject/rlp';
 const testNet = DefaultWalletConfigs.TestNetConfig;
 // Overridden testnet chainId
 const testNetConfig: WalletConfig = {
@@ -120,3 +121,36 @@ describe('Testing TransactionSigner', () => {
     );
   });
 });
+
+test('should transfer correctly', async () => {
+  const phrase =
+    'team school reopen cave banner pass autumn march immune album hockey region baby critic insect armor pigeon owner number velvet romance flight blame tone';
+
+  fc.assert(
+    fc.asyncProperty(
+      fc.integer({ min: 1, max: 100000000000 }) /* gas limit range */,
+      fc.bigInt(BigInt('1'), BigInt('100000000000000000000000000000000')) /* amount range */,
+      async (gasLimit, amount) => {
+        const transferTxSignedHex = await evmTransactionSigner.signTransfer(
+          {
+            amount: amount.toString(),
+            fromAddress: '0xc2aFcEC3DAfAF1a4f47030eE35Fd1A1231C08256',
+            gasLimit: gasLimit,
+            gasPrice: 5_000_000,
+            nonce: 12,
+            toAddress: '0x8875bF87684f46111dbc27725332CEA9C0f12D39',
+            accountNumber: 0,
+            accountSequence: 0,
+            memo: '',
+          },
+          phrase,
+        );
+        const decodedTransaction = RLP.decode(transferTxSignedHex);
+        expect(transferTxSignedHex !== '').to.eq(true);
+        expect(BigInt(decodedTransaction[4]) === amount).to.eq(true);
+        return true;
+      },
+    ),
+    { verbose: true },
+  );
+});
diff --git a/src/utils/NumberUtils.spec.ts b/src/utils/NumberUtils.spec.ts
index a5a50828d..6887a977a 100644
--- a/src/utils/NumberUtils.spec.ts
+++ b/src/utils/NumberUtils.spec.ts
@@ -1,5 +1,7 @@
 import 'mocha';
 import { expect } from 'chai';
+import * as fc from 'fast-check';
+import { Big } from 'big.js';
 import {
   adjustedTransactionAmount,
   fromScientificNotation,
@@ -97,3 +99,55 @@ describe('Testing Number utils', () => {
     expect(adjustedTransactionAmount('0.1223', asset, networkFee)).to.eq('0.1223');
   });
 });
+
+test('should adjust transaction correctly', () => {
+  fc.assert(
+    fc.property(
+      fc.integer({ min: 4, max: 16 }),
+      fc.bigInt(BigInt('0'), BigInt('100000000000000000000000000000000')),
+      fc.bigInt(BigInt('0'), BigInt('100000000000000000000000000000000')),
+
+      (decimals, formamount, balance) => {
+        const { networkFee } = DefaultWalletConfigs.TestNetConfig.fee;
+        const asset: UserAsset = {
+          decimals: decimals,
+          mainnetSymbol: '',
+          balance: balance.toString(),
+          description: 'The best asset',
+          icon_url: 'some url',
+          identifier: 'cbd4bab2cbfd2b3',
+          name: 'Best Asset',
+          symbol: 'BEST',
+          walletId: '',
+          stakedBalance: '0',
+          unbondingBalance: '0',
+          rewardsBalance: '0',
+        };
+
+        const adjustedAmount = adjustedTransactionAmount(formamount.toString(), asset, networkFee);
+        expect(Big(adjustedAmount).gte(Big('0'))).to.eq(true);
+        expect(Big(adjustedAmount).lte(Big(formamount.toString()))).to.eq(true);
+        return true;
+      },
+    ),
+    { verbose: true },
+  );
+});
+
+test('should scale amount correctly', () => {
+  fc.assert(
+    fc.property(
+      fc.integer({ min: 4, max: 16 }),
+      fc.bigInt(BigInt('1'), BigInt('100000000000000000000000000000000')),
+      (decimals, baseAmount) => {
+        const decimalAmount = getUINormalScaleAmount(baseAmount.toString(), decimals, decimals);
+        const restoredBaseAmount = Big(10)
+          .pow(decimals)
+          .mul(Big(decimalAmount));
+        expect(restoredBaseAmount.toFixed()).to.eq(Big(baseAmount.toString()).toFixed());
+        return true;
+      },
+    ),
+    { verbose: true },
+  );
+});
diff --git a/src/utils/NumberUtils.ts b/src/utils/NumberUtils.ts
index 295a4a149..2f47f1d90 100644
--- a/src/utils/NumberUtils.ts
+++ b/src/utils/NumberUtils.ts
@@ -76,18 +76,20 @@ export function getCurrentMinAssetAmount(userAsset: UserAsset) {
 // When user selects option to send max amount,
 // transaction fee gets deduced to the sent amount for the transaction to be successful
 export function adjustedTransactionAmount(
-  formAmount: string = '0',
+  formAmount: string = '0' /* decimal unit */,
   walletAsset: UserAsset,
   fee: string,
 ): string {
   // Handle case for existing users
   const currentFee = fee ?? FIXED_DEFAULT_FEE;
-  // const availableBalance = Big('10000000000000000000000000');
   const availableBalance = Big(scaledBalance(walletAsset));
   const fixedFee = getNormalScaleAmount(currentFee, walletAsset);
   const amountAndFee = Big(formAmount).add(fixedFee);
   if (amountAndFee.gt(availableBalance)) {
-    return availableBalance.minus(fixedFee).toFixed();
+    if (availableBalance.gte(fixedFee)) {
+      return availableBalance.minus(fixedFee).toFixed();
+    }
+    return '0';
   }
   return formAmount.toString();
 }