diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3fcb874b..c00f755a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+### [4.13.1](https://github.com/nash-io/nash-protocol/compare/v4.12.1...v4.13.1) (2024-07-31)
+
 ### [4.12.1](https://github.com/nash-io/nash-protocol/compare/v4.11.21...v4.12.1) (2024-07-08)
 
 ### [4.11.21](https://github.com/nash-io/nash-protocol/compare/v4.11.19...v4.11.21) (2024-05-22)
diff --git a/package.json b/package.json
index 4be1ca38..30f229c3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@neon-exchange/nash-protocol",
-  "version": "4.12.1",
+  "version": "4.13.1",
   "description": "TypeScript implementation of Nash crypto routines",
   "main": "build/main/index.js",
   "typings": "build/main/index.d.ts",
diff --git a/src/__tests__/signatureVectors.json b/src/__tests__/signatureVectors.json
index 6c70d0a5..4c463582 100644
--- a/src/__tests__/signatureVectors.json
+++ b/src/__tests__/signatureVectors.json
@@ -205,10 +205,10 @@
       "timestamp": 1565362799120,
       "signature": "30440220083a73aaaa2b69476c74b64e0f1a1bdc1f6e5d311472729712eba8b5f3343a0a02204dcd5a5aac2693865b140c041cf85d6bd079c9a4803fe83caa218bb09d13d2c2",
       "raw": {
-        "polygon": "03FA39FDDDE46CEA3060B91F80ABED8672F77C5BEA000300000000121278900052E62CFA39FDDDE46CEA3060B91F80ABED8672F77C5BEA"
+        "polygon": "03FA39FDDDE46CEA3060B91F80ABED8672F77C5BEAFFFF00000000121278900052E62CFA39FDDDE46CEA3060B91F80ABED8672F77C5BEA"
       },
       "blockchainSignatures": {
-        "polygon": "e0b4e31781887a3639f24a0dee44356118f9ccc65158e7e06ef90581c7833be620ac6c6ff8906d3d0f87563c442944140b0da5ffb60d2cbfc8017a58d969bfc401"
+        "polygon": "1353f7e60784ef9a2b0826cd5c42bc8e09e6eaf74a22265f21464067642a2044f26c3de33d237f0be1e89a2b83a4fa0503f795826784de79d25521bdde9cd0cf00"
       }
     }
   },
diff --git a/src/generateWallet/generateWallet.ts b/src/generateWallet/generateWallet.ts
index 55e5c19b..4de333cd 100644
--- a/src/generateWallet/generateWallet.ts
+++ b/src/generateWallet/generateWallet.ts
@@ -28,6 +28,7 @@ export enum CoinType {
   ERD = 508,
   NEO = 888,
   NEO3 = 888,
+  NEO_X = 888,
   POLYGON = 966,
   AVAXC = 9000,
   ABRITRUM = 9001
@@ -108,6 +109,8 @@ export const coinTypeFromString = (s: string): CoinType => {
     ltc: CoinType.LTC,
     neo: CoinType.NEO,
     neo3: CoinType.NEO3,
+    neo_x: CoinType.NEO_X,
+    neox: CoinType.NEO_X,
     polygon: CoinType.POLYGON
   }
 
@@ -132,6 +135,9 @@ export const blockchainFromString = (name: string): Blockchain => {
       return Blockchain.POLYGON
     case 'neo3':
       return Blockchain.NEO3
+    case 'neox':
+    case 'neo_x':
+      return Blockchain.NEO_X
     case 'arbitrum':
       return Blockchain.ARBITRUM
     default:
@@ -220,6 +226,7 @@ function generateWalletForCoinType(
     case CoinType.AVAXC:
     case CoinType.POLYGON:
     case CoinType.ABRITRUM:
+    case CoinType.NEO_X:
       // TODO: can we replace this with the elliptic package which we already
       // use to trim bundle size?
       const pubkey = tiny.pointFromScalar(key.privateKey, false)
diff --git a/src/mpc/generateAPIKeys.ts b/src/mpc/generateAPIKeys.ts
index 49b793f6..029f508e 100644
--- a/src/mpc/generateAPIKeys.ts
+++ b/src/mpc/generateAPIKeys.ts
@@ -61,6 +61,14 @@ export async function generateAPIKeys(params: GenerateApiKeysParams): Promise<AP
     Blockchain.ARBITRUM
   )
 
+  const neoXWallet = generateWallet(
+    masterSeed,
+    coinTypeFromString('neo_x'),
+    params.walletIndices.neoX,
+    params.net,
+    Blockchain.NEO_X
+  )
+
   const btcSecret = btcWallet.privateKey
   const ethSecret = ethWallet.privateKey
   const neoSecret = neoWallet.privateKey
@@ -68,6 +76,7 @@ export async function generateAPIKeys(params: GenerateApiKeysParams): Promise<AP
   const polygonSecret = polygonWallet.privateKey
   const neo3Secret = neo3Wallet.privateKey
   const arbitrumSecret = arbitrumWallet.privateKey
+  const neoXSecret = neoXWallet.privateKey
 
   const btc = await createAPIKey({
     ...params,
@@ -105,6 +114,12 @@ export async function generateAPIKeys(params: GenerateApiKeysParams): Promise<AP
     secret: arbitrumSecret
   })
 
+  const neoX = await createAPIKey({
+    ...params,
+    curve: 'Secp256k1',
+    secret: neoXSecret
+  })
+
   return {
     child_keys: {
       [BIP44.BTC]: {
@@ -143,6 +158,12 @@ export async function generateAPIKeys(params: GenerateApiKeysParams): Promise<AP
         public_key: neo3Wallet.publicKey,
         server_secret_share_encrypted: neo3.server_secret_share_encrypted
       },
+      [BIP44.NEO_X]: {
+        address: neoXWallet.address,
+        client_secret_share: neoX.client_secret_share,
+        public_key: neoXWallet.publicKey,
+        server_secret_share_encrypted: neoX.server_secret_share_encrypted
+      },
       [BIP44.ARBITRUM]: {
         address: arbitrumWallet.address,
         client_secret_share: arbitrum.client_secret_share,
diff --git a/src/signPolygonBlockchainData/signPolygonBlockchainData.spec.ts b/src/signPolygonBlockchainData/signPolygonBlockchainData.spec.ts
index 946df428..f9b2249e 100644
--- a/src/signPolygonBlockchainData/signPolygonBlockchainData.spec.ts
+++ b/src/signPolygonBlockchainData/signPolygonBlockchainData.spec.ts
@@ -86,7 +86,7 @@ test('sign derc20 withdraw movement', async () => {
   expect(payloadRes.blockchainMovement).toEqual({
     address: 'fa39fddde46cea3060b91f80abed8672f77c5bea',
     amount: '303200400',
-    asset: '0003',
+    asset: 'ffff',
     nonce: '0052e62c',
     prefix: '03',
     userPubKey: 'fa39fddde46cea3060b91f80abed8672f77c5bea',
@@ -118,7 +118,7 @@ test('sign MATIC/DERC20 market buy order', async () => {
     orderData
   )
   expect(rawData).toBe(
-    '019BAE2051097DC5DDF68D3C01D5FA5CCC7833109D000300000000001700000005FFFFFFFFFFFFFFFF0000000000000000FFFFFFFFFFFFFFFF00000000000000000000002A'
+    '019BAE2051097DC5DDF68D3C01D5FA5CCC7833109DFFFF00000000001700000005FFFFFFFFFFFFFFFF0000000000000000FFFFFFFFFFFFFFFF00000000000000000000002A'
   )
 })
 
@@ -145,7 +145,7 @@ test('sign USDC/WBTC market buy order', async () => {
   )
 
   expect(rawData).toBe(
-    '019BAE2051097DC5DDF68D3C01D5FA5CCC7833109D000300000000001700000005FFFFFFFFFFFFFFFF0000000000000000FFFFFFFFFFFFFFFF00000000000000000000002A'
+    '019BAE2051097DC5DDF68D3C01D5FA5CCC7833109DFFFF000100000001FFFFFFFFFFFFFFFFFFFFFFFF0000000000000000FFFFFFFFFFFFFFFF00000000000000000000002A'
   )
   // console.log("Raw data: ", rawData)
 
diff --git a/src/types/MPC.ts b/src/types/MPC.ts
index e69b889e..7c92795a 100644
--- a/src/types/MPC.ts
+++ b/src/types/MPC.ts
@@ -3,6 +3,7 @@ export enum Blockchain {
   ETH = 'ETH',
   NEO = 'NEO',
   NEO3 = 'NEO3',
+  NEO_X = 'NEO_X',
   AVAXC = 'AVAXC',
   POLYGON = 'POLYGON',
   ARBITRUM = 'ARBITRUM'
@@ -18,6 +19,7 @@ export const BlockchainCurve: Record<Blockchain, Curve> = {
   [Blockchain.BTC]: 'Secp256k1',
   [Blockchain.ETH]: 'Secp256k1',
   [Blockchain.NEO]: 'Secp256r1',
+  [Blockchain.NEO_X]: 'Secp256k1',
   [Blockchain.AVAXC]: 'Secp256k1',
   [Blockchain.POLYGON]: 'Secp256k1',
   [Blockchain.NEO3]: 'Secp256r1',
@@ -90,6 +92,7 @@ export enum BIP44 {
   ETH = "m/44'/60'/0'/0/0",
   NEO = "m/44'/888'/0'/0/0",
   NEO3 = "m/44'/888'/1'/0/0",
+  NEO_X = "m/44'/888'/2'/0/0",
   POLYGON = "m/44'/966'/0'/0/0",
   AVAXC = "m/44'/9000'/0'/0/0",
   ARBITRUM = "m/44'/9001'/0'/0/0"
@@ -116,6 +119,7 @@ export interface APIKey {
     [BIP44.AVAXC]?: ChildKey
     [BIP44.POLYGON]?: ChildKey
     [BIP44.NEO3]?: ChildKey
+    [BIP44.NEO_X]?: ChildKey
     [BIP44.ARBITRUM]?: ChildKey
   }
   payload_signing_key: string