diff --git a/packages/bitcore-node/src/providers/chain-state/evm/api/gnosis.ts b/packages/bitcore-node/src/providers/chain-state/evm/api/gnosis.ts
index 9eaffb4ae6..e55b1e1926 100644
--- a/packages/bitcore-node/src/providers/chain-state/evm/api/gnosis.ts
+++ b/packages/bitcore-node/src/providers/chain-state/evm/api/gnosis.ts
@@ -160,6 +160,10 @@ export class GnosisApi {
     const transactionQuery = getCSP(chain, network).getWalletTransactionQuery(params);
     delete transactionQuery.wallets;
     delete transactionQuery['wallets.0'];
+    // effects.* addresses were stored raw (lowercase) until 1df63364f and were
+    // never backfilled (fixEvmTxToFromAddressesCase.js only rewrites top-level
+    // to/from), so match either casing
+    const eitherCase = (address: string) => ({ $in: [address, address.toLowerCase()] });
     let query;
     if (tokenAddress) {
       query = {
@@ -176,13 +180,13 @@ export class GnosisApi {
           },
           {
             ...transactionQuery,
-            'effects.contractAddress': tokenAddress,
-            'effects.from': normalizedMultisigContractAddress
+            'effects.contractAddress': eitherCase(tokenAddress),
+            'effects.from': eitherCase(normalizedMultisigContractAddress)
           },
           {
             ...transactionQuery,
-            'effects.contractAddress': tokenAddress,
-            'effects.to': normalizedMultisigContractAddress
+            'effects.contractAddress': eitherCase(tokenAddress),
+            'effects.to': eitherCase(normalizedMultisigContractAddress)
           }
         ]
       };
@@ -191,7 +195,7 @@ export class GnosisApi {
         $or: [
           { ...transactionQuery, to: normalizedMultisigContractAddress },
           { ...transactionQuery, 'internal.action.to': normalizedMultisigContractAddress.toLowerCase() },
-          { ...transactionQuery, 'effects.to': normalizedMultisigContractAddress }
+          { ...transactionQuery, 'effects.to': eitherCase(normalizedMultisigContractAddress) }
         ]
       };
     }
diff --git a/packages/bitcore-node/src/providers/chain-state/evm/api/routes.ts b/packages/bitcore-node/src/providers/chain-state/evm/api/routes.ts
index 8c4e3b1545..b3e4ffc600 100644
--- a/packages/bitcore-node/src/providers/chain-state/evm/api/routes.ts
+++ b/packages/bitcore-node/src/providers/chain-state/evm/api/routes.ts
@@ -238,6 +238,15 @@ export class EVMRouter {
   private streamGnosisWalletTransactions(router: Router) { 
     router.get(`/api/${this.chain}/:network/ethmultisig/transactions/:multisigContractAddress`, async (req, res) => {
       const { network, multisigContractAddress } = req.params;
+      const { tokenAddress } = req.query;
+      // Validate and return a helpful 400 before toChecksumAddress throws downstream (which
+      // would surface as a 500). isAddress(x, false) accepts exactly what toChecksumAddress accepts.
+      if (!Web3.utils.isAddress(multisigContractAddress, false)) {
+        return res.status(400).send('Invalid multisig contract address');
+      }
+      if (tokenAddress !== undefined && (typeof tokenAddress !== 'string' || !Web3.utils.isAddress(tokenAddress, false))) {
+        return res.status(400).send('Invalid token address');
+      }
       try {
         return await Gnosis.streamGnosisWalletTransactions({
           chain: this.chain,
diff --git a/packages/bitcore-node/test/unit/models/transaction.test.ts b/packages/bitcore-node/test/unit/models/transaction.test.ts
index e261e31297..189ca6c395 100644
--- a/packages/bitcore-node/test/unit/models/transaction.test.ts
+++ b/packages/bitcore-node/test/unit/models/transaction.test.ts
@@ -504,8 +504,8 @@ describe('Transaction Model', function() {
         expect(findQuery.$or).to.deep.include({
           chain: 'ETH',
           network: 'mainnet',
-          'effects.contractAddress': gnosisBusdToken,
-          'effects.to': gnosisMultisigContractAddress
+          'effects.contractAddress': { $in: [gnosisBusdToken, gnosisBusdToken.toLowerCase()] },
+          'effects.to': { $in: [gnosisMultisigContractAddress, gnosisMultisigContractAddress.toLowerCase()] }
         });
       });
 
@@ -528,8 +528,8 @@ describe('Transaction Model', function() {
         expect(findQuery.$or).to.deep.include({
           chain: 'ETH',
           network: 'mainnet',
-          'effects.contractAddress': gnosisBusdToken,
-          'effects.to': gnosisMultisigContractAddress
+          'effects.contractAddress': { $in: [gnosisBusdToken, gnosisBusdToken.toLowerCase()] },
+          'effects.to': { $in: [gnosisMultisigContractAddress, gnosisMultisigContractAddress.toLowerCase()] }
         });
       });