diff --git a/lib/rpc/UniJsonRpcProvider.ts b/lib/rpc/UniJsonRpcProvider.ts
index 712abbdccd..4bcc0116db 100644
--- a/lib/rpc/UniJsonRpcProvider.ts
+++ b/lib/rpc/UniJsonRpcProvider.ts
@@ -297,10 +297,10 @@ export class UniJsonRpcProvider extends StaticJsonRpcProvider {
           case 'eth_call':
           // eth_estimateGas result type is number, so we can compare directly without casting to number type
           case 'eth_estimateGas':
-            if (castedProviderResponse.result !== castedProviderResponse.result) {
+            if (castedProviderResponse.result !== castedEvaluatedProviderResponse.result) {
               this.log.error(
                 { stitchedMethodName, args },
-                `Provider result mismatch: ${castedProviderResponse.result} from ${selectedProvider.providerId} vs ${castedProviderResponse.result} from ${otherProvider.providerId}`
+                `Provider result mismatch: ${castedProviderResponse.result} from ${selectedProvider.providerId} vs ${castedEvaluatedProviderResponse.result} from ${otherProvider.providerId}`
               )
               selectedProvider.logRpcResponseMismatch(stitchedMethodName, otherProvider)
             } else if (castedProviderResponse.error?.data !== castedEvaluatedProviderResponse.error?.data) {
@@ -342,6 +342,7 @@ export class UniJsonRpcProvider extends StaticJsonRpcProvider {
                 selectedProvider.logRpcResponseMatch(stitchedMethodName, otherProvider)
               }
             } else if (castedProviderResponse.error?.data !== castedEvaluatedProviderResponse.error?.data) {
+              // when comparing the error, the most important part is the data field
               this.log.error(
                 { stitchedMethodName, args },
                 `Provider error mismatch: ${JSON.stringify(castedProviderResponse.error)} from ${
diff --git a/lib/util/eth_feeHistory.ts b/lib/util/eth_feeHistory.ts
index 6963d58f81..bae458ced8 100644
--- a/lib/util/eth_feeHistory.ts
+++ b/lib/util/eth_feeHistory.ts
@@ -1,5 +1,5 @@
 export type EthFeeHistory = {
-  oldestBlock: number
+  oldestBlock: string
   reward: string[]
   baseFeePerGas: string[]
   gasUsedRatio: number[]
diff --git a/test/mocha/unit/rpc/UniJsonRpcProvider.test.ts b/test/mocha/unit/rpc/UniJsonRpcProvider.test.ts
index b641c48020..4d61316aff 100644
--- a/test/mocha/unit/rpc/UniJsonRpcProvider.test.ts
+++ b/test/mocha/unit/rpc/UniJsonRpcProvider.test.ts
@@ -11,6 +11,8 @@ import {
 import { SingleJsonRpcProvider } from '../../../../lib/rpc/SingleJsonRpcProvider'
 import { default as bunyan } from 'bunyan'
 import { ProviderHealthiness } from '../../../../lib/rpc/ProviderHealthState'
+import { JsonRpcResponse } from 'hardhat/types'
+import { EthFeeHistory } from '../../../../lib/util/eth_feeHistory'
 
 const UNI_PROVIDER_TEST_CONFIG: UniJsonRpcProviderConfig = {
   HEALTH_EVALUATION_WAIT_PERIOD_IN_S: 0,
@@ -1008,14 +1010,155 @@ describe('UniJsonRpcProvider', () => {
     expect(spy2.callCount).to.equal(1)
   })
 
-  it('Test compare RPC response for eth_blockNumber', async () => {
-    uniProvider = new UniJsonRpcProvider(
-      ChainId.MAINNET,
-      SINGLE_RPC_PROVIDERS[ChainId.MAINNET],
-      log,
-      UNI_PROVIDER_TEST_CONFIG,
-      1.0,
-      1
-    )
+  it('Test compare RPC result for eth_call with same results', async () => {
+    const rpcProviders = createNewSingleJsonRpcProviders()
+    const selectedProvider = rpcProviders[0]
+    const otherProvider = rpcProviders[1]
+    const spy = sandbox.spy(selectedProvider, 'logRpcResponseMatch')
+
+    uniProvider = new UniJsonRpcProvider(ChainId.MAINNET, rpcProviders, log, UNI_PROVIDER_TEST_CONFIG, 1.0, 1)
+
+    uniProvider.compareRpcResponses('0x123', '0x123', selectedProvider, otherProvider, 'call', [])
+
+    expect(spy.callCount).to.equal(1)
+  })
+
+  it('Test compare RPC result for eth_call with different results', async () => {
+    const rpcProviders = createNewSingleJsonRpcProviders()
+    const selectedProvider = rpcProviders[0]
+    const otherProvider = rpcProviders[1]
+    const spy = sandbox.spy(selectedProvider, 'logRpcResponseMismatch')
+
+    uniProvider = new UniJsonRpcProvider(ChainId.MAINNET, rpcProviders, log, UNI_PROVIDER_TEST_CONFIG, 1.0, 1)
+
+    uniProvider.compareRpcResponses('0x321', '0x123', selectedProvider, otherProvider, 'call', [])
+
+    expect(spy.callCount).to.equal(1)
+  })
+
+  it('Test compare RPC result for eth_estimateGas with same results', async () => {
+    const rpcProviders = createNewSingleJsonRpcProviders()
+    const selectedProvider = rpcProviders[0]
+    const otherProvider = rpcProviders[1]
+    const spy = sandbox.spy(selectedProvider, 'logRpcResponseMatch')
+
+    uniProvider = new UniJsonRpcProvider(ChainId.MAINNET, rpcProviders, log, UNI_PROVIDER_TEST_CONFIG, 1.0, 1)
+
+    const providerResult: JsonRpcResponse = { jsonrpc: '2.0', result: '0x123', id: 76 }
+    const otherProviderResult: JsonRpcResponse = { jsonrpc: '2.0', result: '0x123', id: 76 }
+    uniProvider.compareRpcResponses(providerResult, otherProviderResult, selectedProvider, otherProvider, 'send', [
+      'eth_call',
+    ])
+
+    expect(spy.callCount).to.equal(1)
+  })
+
+  it('Test compare RPC result for eth_estimateGas with different results', async () => {
+    const rpcProviders = createNewSingleJsonRpcProviders()
+    const selectedProvider = rpcProviders[0]
+    const otherProvider = rpcProviders[1]
+    const spy = sandbox.spy(selectedProvider, 'logRpcResponseMismatch')
+
+    uniProvider = new UniJsonRpcProvider(ChainId.MAINNET, rpcProviders, log, UNI_PROVIDER_TEST_CONFIG, 1.0, 1)
+
+    const providerResult: JsonRpcResponse = { jsonrpc: '2.0', result: '0x123', id: 76 }
+    const otherProviderResult: JsonRpcResponse = { jsonrpc: '2.0', result: '0x321', id: 76 }
+    uniProvider.compareRpcResponses(providerResult, otherProviderResult, selectedProvider, otherProvider, 'send', [
+      'eth_call',
+    ])
+
+    expect(spy.callCount).to.equal(1)
+  })
+
+  it('Test compare RPC error for eth_estimateGas with same errors', async () => {
+    const rpcProviders = createNewSingleJsonRpcProviders()
+    const selectedProvider = rpcProviders[0]
+    const otherProvider = rpcProviders[1]
+    const spy = sandbox.spy(selectedProvider, 'logRpcResponseMatch')
+
+    uniProvider = new UniJsonRpcProvider(ChainId.MAINNET, rpcProviders, log, UNI_PROVIDER_TEST_CONFIG, 1.0, 1)
+
+    const providerError = { code: '123', data: '0x123', error: 'CALL_EXCEPTION' }
+    const otherProviderError = { code: '123', data: '0x123', error: 'CALL_EXCEPTION' }
+    uniProvider.compareRpcResponses(providerError, otherProviderError, selectedProvider, otherProvider, 'send', [
+      'eth_call',
+    ])
+
+    expect(spy.callCount).to.equal(1)
+  })
+
+  it('Test compare RPC error for eth_estimateGas with different errors', async () => {
+    const rpcProviders = createNewSingleJsonRpcProviders()
+    const selectedProvider = rpcProviders[0]
+    const otherProvider = rpcProviders[1]
+    const spy = sandbox.spy(selectedProvider, 'logRpcResponseMatch')
+
+    uniProvider = new UniJsonRpcProvider(ChainId.MAINNET, rpcProviders, log, UNI_PROVIDER_TEST_CONFIG, 1.0, 1)
+
+    const providerError = { code: '123', data: '0x321', error: 'CALL_EXCEPTION' }
+    const otherProviderError = { code: '123', data: '0x123', error: 'CALL_EXCEPTION' }
+    uniProvider.compareRpcResponses(providerError, otherProviderError, selectedProvider, otherProvider, 'send', [
+      'eth_call',
+    ])
+
+    expect(spy.callCount).to.equal(1)
+  })
+
+  it('Test compare RPC result for eth_feeHistory with different results, but one is a number and the other is a string', async () => {
+    const rpcProviders = createNewSingleJsonRpcProviders()
+    const selectedProvider = rpcProviders[0]
+    const otherProvider = rpcProviders[1]
+    const spy = sandbox.spy(selectedProvider, 'logRpcResponseMatch')
+
+    uniProvider = new UniJsonRpcProvider(ChainId.MAINNET, rpcProviders, log, UNI_PROVIDER_TEST_CONFIG, 1.0, 1)
+
+    const ethFeeHistory: EthFeeHistory = {
+      oldestBlock: '0x1347665',
+      reward: ['0x21f43815'],
+      baseFeePerGas: ['0x7750ad57'],
+      gasUsedRatio: [0.4496709],
+      baseFeePerBlobGas: ['0x1'],
+      blobGasUsedRatio: [0.4496709],
+    }
+    const providerResult: JsonRpcResponse = { jsonrpc: '2.0', result: ethFeeHistory, id: 76 }
+    const otherProviderResult: JsonRpcResponse = { jsonrpc: '2.0', result: ethFeeHistory, id: 76 }
+    uniProvider.compareRpcResponses(providerResult, otherProviderResult, selectedProvider, otherProvider, 'send', [
+      'eth_feeHistory',
+    ])
+
+    expect(spy.callCount).to.equal(1)
+  })
+
+  it('Test compare RPC result for eth_feeHistory with different results', async () => {
+    const rpcProviders = createNewSingleJsonRpcProviders()
+    const selectedProvider = rpcProviders[0]
+    const otherProvider = rpcProviders[1]
+    const spy = sandbox.spy(selectedProvider, 'logRpcResponseMismatch')
+
+    uniProvider = new UniJsonRpcProvider(ChainId.MAINNET, rpcProviders, log, UNI_PROVIDER_TEST_CONFIG, 1.0, 1)
+
+    const ethFeeHistory: EthFeeHistory = {
+      oldestBlock: '0x1347665',
+      reward: ['0x21f43815'],
+      baseFeePerGas: ['0x7750ad57'],
+      gasUsedRatio: [0.4496709],
+      baseFeePerBlobGas: ['0x1'],
+      blobGasUsedRatio: [0.4496709],
+    }
+    const ethFeeHistory2: EthFeeHistory = {
+      oldestBlock: '0x1347661',
+      reward: ['0x21f43815'],
+      baseFeePerGas: ['0x7750ad57'],
+      gasUsedRatio: [0.4496709],
+      baseFeePerBlobGas: ['0x1'],
+      blobGasUsedRatio: [0.4496709],
+    }
+    const providerResult: JsonRpcResponse = { jsonrpc: '2.0', result: ethFeeHistory, id: 76 }
+    const otherProviderResult: JsonRpcResponse = { jsonrpc: '2.0', result: ethFeeHistory2, id: 76 }
+    uniProvider.compareRpcResponses(providerResult, otherProviderResult, selectedProvider, otherProvider, 'send', [
+      'eth_feeHistory',
+    ])
+
+    expect(spy.callCount).to.equal(1)
   })
 })