diff --git a/packages/snaps-controllers/src/multichain/MultichainRouter.ts b/packages/snaps-controllers/src/multichain/MultichainRouter.ts
index 702bd6b13b..917c43ec1f 100644
--- a/packages/snaps-controllers/src/multichain/MultichainRouter.ts
+++ b/packages/snaps-controllers/src/multichain/MultichainRouter.ts
@@ -8,7 +8,11 @@ import {
 import type { Json, JsonRpcRequest, SnapId } from '@metamask/snaps-sdk';
 import type { Caip2ChainId } from '@metamask/snaps-utils';
 import { HandlerType } from '@metamask/snaps-utils';
-import type { CaipAccountId, CaipChainId } from '@metamask/utils';
+import type {
+  CaipAccountId,
+  CaipChainId,
+  JsonRpcParams,
+} from '@metamask/utils';
 import { hasProperty, parseCaipAccountId } from '@metamask/utils';
 
 import { getRunnableSnaps } from '../snaps';
@@ -245,7 +249,7 @@ export class MultichainRouter {
           scope,
           request: {
             method,
-            params,
+            params: params as JsonRpcParams,
           },
         }),
       );
diff --git a/packages/snaps-controllers/src/test-utils/multichain.ts b/packages/snaps-controllers/src/test-utils/multichain.ts
index c4f7a39269..6a28f1513a 100644
--- a/packages/snaps-controllers/src/test-utils/multichain.ts
+++ b/packages/snaps-controllers/src/test-utils/multichain.ts
@@ -2,7 +2,7 @@ import type { PermissionConstraint } from '@metamask/permission-controller';
 import { SnapEndowments } from '@metamask/snaps-rpc-methods';
 import { SnapCaveatType } from '@metamask/snaps-utils';
 import { MOCK_SNAP_ID } from '@metamask/snaps-utils/test-utils';
-import type { CaipAccountId, CaipChainId } from '@metamask/utils';
+import type { CaipAccountId, CaipChainId, Json } from '@metamask/utils';
 
 export const BTC_CAIP2 =
   'bip122:000000000019d6689c085ae165831e93' as CaipChainId;
@@ -89,13 +89,13 @@ export const MOCK_SOLANA_SNAP_PERMISSIONS: Record<
 };
 
 type MockSnapKeyring = {
-  submitRequest: (request: unknown) => Promise<unknown>;
-  resolveAccountAddress: (options: unknown) => Promise<unknown>;
+  submitRequest: (request: unknown) => Promise<Json>;
+  resolveAccountAddress: (
+    options: unknown,
+  ) => Promise<{ address: CaipAccountId } | null>;
 };
 
-type MockOperationCallback = <ReturnType>(
-  keyring: MockSnapKeyring,
-) => Promise<ReturnType>;
+type MockOperationCallback = (keyring: MockSnapKeyring) => Promise<Json>;
 
 export const getMockWithSnapKeyring = (
   { submitRequest = jest.fn(), resolveAccountAddress = jest.fn() } = {