Filter exception musd

packages/assets-controller/CHANGELOG.md

@@ -15,6 +15,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Bump `@metamask/keyring-snap-client` from `^8.2.0` to `^9.0.1` ([#8464](https://github.com/MetaMask/core/pull/8464))
 - Bump `@metamask/transaction-controller` from `^64.2.0` to `^64.3.0` ([#8482](https://github.com/MetaMask/core/pull/8482))
 
+### Fixed
+
+- Exempt mUSD token from EVM ERC-20 minimum-occurrence spam filter so it is no longer incorrectly hidden ([#8541](https://github.com/MetaMask/core/pull/8541))
+
 ## [6.0.0]
 
 ### Added

packages/assets-controller/src/data-sources/TokenDataSource.test.ts

@@ -779,6 +779,39 @@ describe('TokenDataSource', () => {
     );
   });
 
+  it.each([
+    { occurrences: 1, label: 'low occurrences' },
+    { occurrences: undefined, label: 'no occurrences' },
+  ])('middleware keeps MUSD token despite $label', async ({ occurrences }) => {
+    const musdAsset =
+      'eip155:1/erc20:0xaca92e438df0b2401ff60da7e4337b687a2435da' as Caip19AssetId;
+
+    const { controller } = setupController({
+      messenger: createTestMessenger(),
+      supportedNetworks: ['eip155:1'],
+      assetsResponse: [
+        createMockAssetResponse(musdAsset, {
+          name: 'mUSD',
+          symbol: 'MUSD',
+          occurrences,
+        }),
+      ],
+    });
+
+    const next = jest.fn().mockResolvedValue(undefined);
+    const context = createMiddlewareContext({
+      response: {
+        detectedAssets: {
+          'mock-account-id': [musdAsset],
+        },
+      },
+    });
+
+    await controller.assetsMiddleware(context, next);
+
+    expect(context.response.assetsInfo?.[musdAsset]).toBeDefined();
+  });
+
   it('middleware filters out erc20 assets with missing occurrences', async () => {
     const noOccurrenceAsset =
       'eip155:1/erc20:0x2222222222222222222222222222222222222222' as Caip19AssetId;

packages/assets-controller/src/data-sources/TokenDataSource.ts

@@ -49,6 +49,8 @@ enum CaipAssetNamespace {
   Token = 'token',
 }
 
+const MUSD_ADDRESS_LOWERCASE = '0xaca92e438df0b2401ff60da7e4337b687a2435da';
+
 // ============================================================================
 // OPTIONS
 // ============================================================================
@@ -419,7 +421,8 @@ export class TokenDataSource {
           evmErc20Ids.filter(
             (id) =>
               customAssetIds.has(id) ||
-              (occurrencesByAssetId.get(id) ?? 0) >= MIN_TOKEN_OCCURRENCES,
+              (occurrencesByAssetId.get(id) ?? 0) >= MIN_TOKEN_OCCURRENCES ||
+              id.includes(`/erc20:${MUSD_ADDRESS_LOWERCASE}`),
           ),
         );