diff --git a/package-lock.json b/package-lock.json
index a16f71a1..f7654034 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "gridplus-sdk",
-  "version": "2.5.1",
+  "version": "2.5.2",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "gridplus-sdk",
-      "version": "2.5.1",
+      "version": "2.5.2",
       "hasInstallScript": true,
       "license": "MIT",
       "dependencies": {
diff --git a/package.json b/package.json
index 48c22567..7514a662 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "gridplus-sdk",
-  "version": "2.5.1",
+  "version": "2.5.2",
   "description": "SDK to interact with GridPlus Lattice1 device",
   "scripts": {
     "build": "NODE_ENV=production tsc -p tsconfig.json",
@@ -109,4 +109,4 @@
     "vitest": "^0.15.2"
   },
   "license": "MIT"
-}
+}
\ No newline at end of file
diff --git a/src/__test__/e2e/eth.msg.test.ts b/src/__test__/e2e/eth.msg.test.ts
index b13789cf..515a379f 100644
--- a/src/__test__/e2e/eth.msg.test.ts
+++ b/src/__test__/e2e/eth.msg.test.ts
@@ -273,6 +273,41 @@ describe('ETH Messages', () => {
       await runEthMsg(buildEthMsgReq(msg, 'eip712'), client);
     });
 
+    it('Should test Vertex message', async () => {
+      const msg = {
+        'types': {
+            'EIP712Domain': [
+                {'name': 'name', 'type': 'string'},
+                {'name': 'version', 'type': 'string'},
+                {'name': 'chainId', 'type': 'uint256'},
+                {'name': 'verifyingContract', 'type': 'address'}
+            ],
+            'Order': [
+                {'name': 'sender', 'type': 'bytes32'},
+                {'name': 'priceX18', 'type': 'int128'},
+                {'name': 'amount', 'type': 'int128'},
+                {'name': 'expiration', 'type': 'uint64'},
+                {'name': 'nonce', 'type': 'uint64'},
+            ],
+        },
+        'primaryType': 'Order',
+        'domain': {
+            'name': 'Vertex',
+            'version': '0.0.1',
+            'chainId': '42161',  
+            'verifyingContract': '0xf03f457a30e598d5020164a339727ef40f2b8fbc'
+        },
+        'message': {
+            'sender': '0x841fe4876763357975d60da128d8a54bb045d76a64656661756c740000000000',
+            'priceX18': '28898000000000000000000',
+            'amount': '-10000000000000000',
+            'expiration': '4611687701117784255',
+            'nonce': '1764428860167815857',
+        },
+      };
+      await runEthMsg(buildEthMsgReq(msg, 'eip712'), client);
+    })
+
     it('Should test a large 1inch transaction', async () => {
       const msg = {
         domain: {
diff --git a/src/ethereum.ts b/src/ethereum.ts
index 2dc1d902..1c9db291 100644
--- a/src/ethereum.ts
+++ b/src/ethereum.ts
@@ -868,10 +868,27 @@ function parseEIP712Item(data, type, forJSParser = false) {
     if (forJSParser) {
       data = `0x${data.toString('hex')}`;
     }
+  } else if (
+    ethMsgProtocol.TYPED_DATA.typeCodes[type] &&
+    (type.indexOf('uint') === -1 && type.indexOf('int') > -1)
+  ) {
+    // Handle signed integers using bignumber.js directly
+    // `bignumber.js` is needed for `cbor` encoding, which gets sent to the Lattice and plays
+    // nicely with its firmware cbor lib.
+    // NOTE: If we instantiate a `bignumber.js` object, it will not match what `borc` creates
+    // when run inside of the browser (i.e. MetaMask). Thus we introduce this hack to make sure
+    // we are creating a compatible type.
+    // TODO: Find another cbor lib that is compataible with the firmware's lib in a browser
+    // context. This is surprisingly difficult - I tried several libs and only cbor/borc have
+    // worked (borc is a supposedly "browser compatible" version of cbor)
+    data = new cbor.Encoder().semanticTypes[1][0](data);
   } else if (
     ethMsgProtocol.TYPED_DATA.typeCodes[type] &&
     (type.indexOf('uint') > -1 || type.indexOf('int') > -1)
   ) {
+    // For uints, convert to a buffer and do some sanity checking.
+    // Note that we could probably just use bignumber.js directly as we do with
+    // signed ints, but this code is battle tested and we don't want to change it.
     let b = ensureHexBuffer(data);
     // Edge case to handle 0-value bignums
     if (b.length === 0) {
@@ -882,14 +899,7 @@ function parseEIP712Item(data, type, forJSParser = false) {
       // For EIP712 encoding in this module we need strings to represent the numbers
       data = `0x${b.toString('hex')}`;
     } else {
-      // `bignumber.js` is needed for `cbor` encoding, which gets sent to the Lattice and plays
-      // nicely with its firmware cbor lib.
-      // NOTE: If we instantiate a `bignumber.js` object, it will not match what `borc` creates
-      // when run inside of the browser (i.e. MetaMask). Thus we introduce this hack to make sure
-      // we are creating a compatible type.
-      // TODO: Find another cbor lib that is compataible with the firmware's lib in a browser
-      // context. This is surprisingly difficult - I tried several libs and only cbor/borc have
-      // worked (borc is a supposedly "browser compatible" version of cbor)
+      // Load into bignumber.js used by cbor lib
       data = new cbor.Encoder().semanticTypes[1][0](b.toString('hex'), 16);
     }
   } else if (type === 'bool') {