diff --git a/packages/0xsequence/tests/browser/wallet-provider/dapp.test.ts b/packages/0xsequence/tests/browser/wallet-provider/dapp.test.ts
index e66c376c7..98cc1ede7 100644
--- a/packages/0xsequence/tests/browser/wallet-provider/dapp.test.ts
+++ b/packages/0xsequence/tests/browser/wallet-provider/dapp.test.ts
@@ -123,6 +123,8 @@ export const tests = async () => {
   })
 
   await test('multiple networks', async () => {
+    const toHexString = n => `0x${n.toString(16)}`
+
     // chainId 31337
     {
       assert.equal(provider.getChainId(), 31337, 'provider chainId is 31337')
@@ -134,7 +136,7 @@ export const tests = async () => {
       assert.equal(netVersion, '31337', 'net_version check')
   
       const chainId = await provider.send('eth_chainId', [])
-      assert.equal(chainId, 31337, 'eth_chainId check')
+      assert.equal(chainId, toHexString(31337), 'eth_chainId check')
   
       const chainId2 = await signer.getChainId()
       assert.equal(chainId2, 31337, 'chainId check')
@@ -152,7 +154,7 @@ export const tests = async () => {
       assert.equal(netVersion, '31338', '2nd chain, net_version check - 4')
   
       const chainId = await provider2.send('eth_chainId', [])
-      assert.equal(chainId, 31338, '2nd chain, eth_chainId check - 5')
+      assert.equal(chainId, toHexString(31338), '2nd chain, eth_chainId check - 5')
   
       const chainId2 = await provider2.getSigner().getChainId()
       assert.equal(chainId2, 31338, '2nd chain, chainId check - 6')
diff --git a/packages/provider/src/provider.ts b/packages/provider/src/provider.ts
index 91ef7248c..88be9c51f 100644
--- a/packages/provider/src/provider.ts
+++ b/packages/provider/src/provider.ts
@@ -247,7 +247,7 @@ export class SequenceProvider extends ethers.providers.BaseProvider implements I
   async perform(method: string, params: any): Promise<any> {
     // First we check if the method should be handled by the client
     if (method === 'eth_chainId') {
-      return this.useChainId()
+      return `0x${(await this.useChainId()).toString(16)}`
     }
 
     if (method === 'eth_accounts') {
diff --git a/packages/provider/tests/provider.spec.ts b/packages/provider/tests/provider.spec.ts
index 332fb132c..4c39f1146 100644
--- a/packages/provider/tests/provider.spec.ts
+++ b/packages/provider/tests/provider.spec.ts
@@ -1188,27 +1188,29 @@ describe('SequenceProvider', () => {
     })
 
     describe('perform implementation', () => {
+      const toHexString = n => `0x${n.toString(16)}`
+
       describe('perform eth_chainId', async () => {
         it('should return initial default chainId', async () => {
           const provider = new SequenceProvider(basicMockClient, providerFor)
-          expect(await provider.perform('eth_chainId', [])).to.equal(31337)
+          expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31337))
         })
 
         it('should return new default chainId', async () => {
           const provider = new SequenceProvider(basicMockClient, providerFor)
           provider.setDefaultChainId(31338)
-          expect(await provider.perform('eth_chainId', [])).to.equal(31338)
+          expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31338))
         })
 
         it('should return static chainId', async () => {
           const provider = new SequenceProvider(basicMockClient, providerFor)
-          expect(await provider.getProvider(31337).perform('eth_chainId', [])).to.equal(31337)
-          expect(await provider.getProvider(31338).perform('eth_chainId', [])).to.equal(31338)
+          expect(await provider.getProvider(31337).perform('eth_chainId', [])).to.equal(toHexString(31337))
+          expect(await provider.getProvider(31338).perform('eth_chainId', [])).to.equal(toHexString(31338))
         })
 
         it('should return chainId using request', async () => {
           const provider = new SequenceProvider(basicMockClient, providerFor)
-          expect(await provider.request({ method: 'eth_chainId' })).to.equal(31337)
+          expect(await provider.request({ method: 'eth_chainId' })).to.equal(toHexString(31337))
         })
       })
 
@@ -1241,7 +1243,7 @@ describe('SequenceProvider', () => {
       describe('perform wallet_switchEthereumChain', async () => {
         it('should switch default chainId using request', async () => {
           const provider = new SequenceProvider(basicMockClient, providerFor)
-          expect(await provider.request({ method: 'eth_chainId' })).to.equal(31337)
+          expect(await provider.request({ method: 'eth_chainId' })).to.equal(toHexString(31337))
 
           await provider.request({ method: 'wallet_switchEthereumChain', params: [{ chainId: '0x7a6a' }] })
           expect(defaultChainId).to.equal(31338)
@@ -1249,38 +1251,38 @@ describe('SequenceProvider', () => {
 
         it('should switch default chainId using object', async () => {
           const provider = new SequenceProvider(basicMockClient, providerFor)
-          expect(await provider.perform('eth_chainId', [])).to.equal(31337)
+          expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31337))
 
           await provider.perform('wallet_switchEthereumChain', [{ chainId: '0x7a6a' }])
           expect(defaultChainId).to.equal(31338)
-          expect(await provider.perform('eth_chainId', [])).to.equal(31338)
+          expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31338))
         })
 
         it('should switch default chainId using hex string', async () => {
           const provider = new SequenceProvider(basicMockClient, providerFor)
-          expect(await provider.perform('eth_chainId', [])).to.equal(31337)
+          expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31337))
 
           await provider.perform('wallet_switchEthereumChain', ['0x7a6a'])
           expect(defaultChainId).to.equal(31338)
-          expect(await provider.perform('eth_chainId', [])).to.equal(31338)
+          expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31338))
         })
 
         it('should switch default chainId using number', async () => {
           const provider = new SequenceProvider(basicMockClient, providerFor)
-          expect(await provider.perform('eth_chainId', [])).to.equal(31337)
+          expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31337))
 
           await provider.perform('wallet_switchEthereumChain', [31338])
           expect(defaultChainId).to.equal(31338)
-          expect(await provider.perform('eth_chainId', [])).to.equal(31338)
+          expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31338))
         })
 
         it('should switch default chainId using string', async () => {
           const provider = new SequenceProvider(basicMockClient, providerFor)
-          expect(await provider.perform('eth_chainId', [])).to.equal(31337)
+          expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31337))
 
           await provider.perform('wallet_switchEthereumChain', ['31338'])
           expect(defaultChainId).to.equal(31338)
-          expect(await provider.perform('eth_chainId', [])).to.equal(31338)
+          expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31338))
         })
 
         it('should fail to switch default chainId on static network provider', async () => {
@@ -1292,38 +1294,38 @@ describe('SequenceProvider', () => {
         describe('using the setDefaultChainId method', async () => {
           it('should switch default chainId using name', async () => {
             const provider = new SequenceProvider(basicMockClient, providerFor)
-            expect(await provider.perform('eth_chainId', [])).to.equal(31337)
+            expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31337))
 
             provider.setDefaultChainId('hardhat2')
             expect(defaultChainId).to.equal(31338)
-            expect(await provider.perform('eth_chainId', [])).to.equal(31338)
+            expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31338))
           })
 
           it('should switch default chainId using number', async () => {
             const provider = new SequenceProvider(basicMockClient, providerFor)
-            expect(await provider.perform('eth_chainId', [])).to.equal(31337)
+            expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31337))
 
             provider.setDefaultChainId(31338)
             expect(defaultChainId).to.equal(31338)
-            expect(await provider.perform('eth_chainId', [])).to.equal(31338)
+            expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31338))
           })
 
           it('should switch default chainId using string', async () => {
             const provider = new SequenceProvider(basicMockClient, providerFor)
-            expect(await provider.perform('eth_chainId', [])).to.equal(31337)
+            expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31337))
 
             provider.setDefaultChainId('31338')
             expect(defaultChainId).to.equal(31338)
-            expect(await provider.perform('eth_chainId', [])).to.equal(31338)
+            expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31338))
           })
 
           it('should switch default chainId using hex string', async () => {
             const provider = new SequenceProvider(basicMockClient, providerFor)
-            expect(await provider.perform('eth_chainId', [])).to.equal(31337)
+            expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31337))
 
             provider.setDefaultChainId('0x7a6a')
             expect(defaultChainId).to.equal(31338)
-            expect(await provider.perform('eth_chainId', [])).to.equal(31338)
+            expect(await provider.perform('eth_chainId', [])).to.equal(toHexString(31338))
           })
 
           it('should fail to switch default chainId on static network provider', async () => {