fix: fixed potential conformity tests regression

packages/relay/src/lib/services/ethService/contractService/ContractService.ts

@@ -523,6 +523,20 @@ export class ContractService implements IContractService {
       return constants.EMPTY_HEX;
     }
 
+    // Map additional Mirror Node 400 precheck failures during eth_call to a non-error empty result
+    // Only for entity-nonexistence style messages; do not swallow genuine EVM reverts
+    if (e.statusCode === 400) {
+      const nonExistenceMessages = new Set<string>([
+        'INVALID_ACCOUNT_ID',
+        'ACCOUNT_ID_DOES_NOT_EXIST',
+        'INVALID_CONTRACT_ID',
+        'CONTRACT_ID_DOES_NOT_EXIST',
+      ]);
+      if (e.message && nonExistenceMessages.has(e.message)) {
+        return constants.EMPTY_HEX;
+      }
+    }
+
     if (e.isContractReverted()) {
       if (this.logger.isLevelEnabled('trace')) {
         this.logger.trace(

packages/relay/tests/lib/eth/eth_call.spec.ts

@@ -420,6 +420,39 @@ describe('@ethCall Eth Call spec', async function () {
       expect((result as JsonRpcError).data).to.equal(defaultErrorMessageHex);
     });
 
+    it('eth_call view with non-existing from succeeds', async function () {
+      const NON_EXISTENT_FROM = '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa';
+      const callData = {
+        ...defaultCallData,
+        from: NON_EXISTENT_FROM,
+        to: CONTRACT_ADDRESS_2,
+        data: CONTRACT_CALL_DATA,
+        gas: MAX_GAS_LIMIT,
+      };
+
+      restMock.onGet(`contracts/${CONTRACT_ADDRESS_2}`).reply(200, JSON.stringify(DEFAULT_CONTRACT_2));
+      await mockContractCall({ ...callData, block: 'latest' }, false, 200, { result: '0x00' }, requestDetails);
+      const result = await contractService.call(callData, 'latest', requestDetails);
+      expect(result).to.equal('0x00');
+    });
+
+    it('eth_call tx with non-existing from and value=0 succeeds', async function () {
+      const NON_EXISTENT_FROM = '0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb';
+      const callData = {
+        ...defaultCallData,
+        from: NON_EXISTENT_FROM,
+        to: CONTRACT_ADDRESS_2,
+        data: CONTRACT_CALL_DATA,
+        gas: MAX_GAS_LIMIT,
+        value: null,
+      };
+
+      restMock.onGet(`contracts/${CONTRACT_ADDRESS_2}`).reply(200, JSON.stringify(DEFAULT_CONTRACT_2));
+      await mockContractCall({ ...callData, block: 'latest' }, false, 200, { result: '0x00' }, requestDetails);
+      const result = await contractService.call(callData, 'latest', requestDetails);
+      expect(result).to.equal('0x00');
+    });
+
     it('eth_call with wrong `to` field', async function () {
       const args = [
         {

packages/server/tests/acceptance/data/conformity-tests-batch-4.json

@@ -25,7 +25,7 @@
   },
   "eth_call - existing contract tx, non-existing from and positive value": {
     "request": "{\"method\":\"eth_call\",\"params\":[{\"from\":\"0x6b175474e89094c44da98b954eedeac495271d0f\",\"to\":\"0x6b175474e89094c44da98b954eedeac495271d0f\",\"data\":\"0x70a082310000000000000000000000006E0d01A76C3Cf4288372a29124A26D4353EE51BE\",\"value\":\"0x2540be400\"},\"latest\"],\"id\":1,\"jsonrpc\":\"2.0\"}",
-    "response": "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":[]}"
+    "response": "{\"jsonrpc\":\"2.0\",\"id\":1,\"error\":{\"code\":-32000,\"message\":\"insufficient funds for transfer\"}}"
   },
   "eth_estimateGas - non existing contract": {
     "request": "{\"method\":\"eth_estimateGas\",\"params\":[{\"from\":\"0x6b175474e89094c44da98b954eedeac495271d0f\",\"to\":\"0x6b175474e89094c44da98b954eedeac495271d0f\",\"data\":\"0x70a082310000000000000000000000006E0d01A76C3Cf4288372a29124A26D4353EE51BE\"},\"latest\"],\"id\":1,\"jsonrpc\":\"2.0\"}",