fix: use aggregate3 function to fetch balances for all accounts

Author: salimtb

eslint-warning-thresholds.json

@@ -53,15 +53,13 @@
     "import-x/order": 1
   },
   "packages/assets-controllers/src/Standards/ERC20Standard.test.ts": {
-    "prettier/prettier": 1
+    "jest/no-commented-out-tests": 1
   },
   "packages/assets-controllers/src/Standards/NftStandards/ERC721/ERC721Standard.ts": {
     "prettier/prettier": 1
   },
-  "packages/assets-controllers/src/TokenBalancesController.ts": {
-    "@typescript-eslint/prefer-readonly": 4,
-    "jsdoc/check-tag-names": 4,
-    "jsdoc/tag-lines": 11
+  "packages/assets-controllers/src/TokenBalancesController.test.ts": {
+    "no-empty-function": 1
   },
   "packages/assets-controllers/src/TokenDetectionController.test.ts": {
     "import-x/namespace": 11,
@@ -102,8 +100,8 @@
   "packages/assets-controllers/src/assetsUtil.ts": {
     "jsdoc/tag-lines": 2
   },
-  "packages/assets-controllers/src/multi-chain-accounts-service/multi-chain-accounts.ts": {
-    "jsdoc/tag-lines": 2
+  "packages/assets-controllers/src/multi-chain-accounts-service/api-balance-fetcher.test.ts": {
+    "@typescript-eslint/no-unused-vars": 1
   },
   "packages/assets-controllers/src/multicall.test.ts": {
     "@typescript-eslint/prefer-promise-reject-errors": 2

packages/assets-controllers/CHANGELOG.md

@@ -15,6 +15,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - Supports up to 300 calls per batch with automatic fallback to individual calls on unsupported chains
   - Returns organized balance data as nested maps for easy consumption by client applications
 
+### Changed
+
+- Improved `TokenBalancesController` performance with two-tier balance fetching strategy ([#6232](https://github.com/MetaMask/core/pull/6232))
+  - Implements Accounts API as primary fetching method for supported networks (faster, more efficient)
+  - Falls back to RPC calls using Multicall3's `aggregate3` for unsupported networks or API failures
+  - Significantly reduces RPC calls from N individual requests to batched calls of up to 300 operations
+  - Provides comprehensive network coverage with graceful degradation when services are unavailable
+
 ### Fixed
 
 - Use a narrow selector when listening to `CurrencyRateController:stateChange` ([#6217](https://github.com/MetaMask/core/pull/6217))

packages/assets-controllers/package.json

@@ -99,6 +99,7 @@
     "jest": "^27.5.1",
     "jest-environment-jsdom": "^27.5.1",
     "nock": "^13.3.1",
+    "reselect": "^5.1.1",
     "sinon": "^9.2.4",
     "ts-jest": "^27.1.4",
     "typedoc": "^0.24.8",