diff --git a/src/types/account.ts b/src/types/account.ts
index 59d821a..a03a108 100644
--- a/src/types/account.ts
+++ b/src/types/account.ts
@@ -70,7 +70,7 @@ export type ReservedBalance = {
   /** Unique identifier of the reservation */
   identification: string
   /** Available amount(s) in the reservation, one entry per remuneration band */
-  amounts: ReservedBalanceAmount[]
+  availableAmounts: ReservedBalanceAmount[]
 }
 
 export type ReservedBalanceAmount = {
diff --git a/tests/accounts.test.ts b/tests/accounts.test.ts
new file mode 100644
index 0000000..223cdac
--- /dev/null
+++ b/tests/accounts.test.ts
@@ -0,0 +1,113 @@
+import nock from 'nock'
+import { setupAuth } from './utils'
+import { PluggyClient } from '../src/client'
+import { Account } from '../src/types'
+
+const ACCOUNT_ID = 'account-abc'
+const API_URL = process.env.PLUGGY_API_URL!
+
+/**
+ * Account with reserved balances ("caixinhas"), shaped like a real
+ * `GET /accounts/{id}` response from an Open Finance connector.
+ *
+ * Typed as `Account` on purpose: the reserved balance field is named
+ * `availableAmounts` in the API (and in `oas3.json`), but the SDK originally
+ * typed it as `amounts`, so every reservation read as `undefined` at runtime.
+ * Keeping the fixture typed means renaming the field back is a compile error.
+ *
+ * Note this only surfaces under `tsc` / in the editor — `pnpm test` does not
+ * type-check, because `isolatedModules: true` makes ts-jest transpile only.
+ */
+const accountWithReservedBalances: Account = {
+  id: ACCOUNT_ID,
+  itemId: 'item-abc',
+  type: 'BANK',
+  subtype: 'CHECKING_ACCOUNT',
+  number: '123456',
+  balance: 1500.0,
+  name: 'Conta Corrente',
+  marketingName: null,
+  owner: 'John Doe',
+  taxNumber: null,
+  currencyCode: 'BRL',
+  creditData: null,
+  bankData: {
+    transferNumber: '001/1234/123456',
+    closingBalance: 1500.0,
+    automaticallyInvestedBalance: null,
+    overdraftContractedLimit: null,
+    overdraftUsedLimit: null,
+    unarrangedOverdraftAmount: null,
+    hasReservedBalance: true,
+    reservedBalances: [
+      {
+        name: 'Caixinha Para Férias',
+        identification: 'reservation-1',
+        availableAmounts: [
+          {
+            amount: 250.5,
+            currencyCode: 'BRL',
+            remuneration: {
+              preFixedRate: null,
+              postFixedIndexerPercentage: 1.1,
+              rateType: 'LINEAR',
+              indexer: 'CDI',
+              calculation: 'DIAS_UTEIS',
+              ratePeriodicity: 'ANUAL',
+              indexerAdditionalInfo: null,
+            },
+          },
+        ],
+      },
+    ],
+  },
+}
+
+describe('fetchAccount with reserved balances', () => {
+  beforeEach(() => {
+    nock.cleanAll()
+    setupAuth()
+  })
+
+  it('exposes reserved balance amounts under availableAmounts', async () => {
+    const mock = nock(API_URL)
+      .get(`/accounts/${ACCOUNT_ID}`)
+      .reply(200, accountWithReservedBalances)
+
+    const client = new PluggyClient({ clientId: '123', clientSecret: '456' })
+    const account = await client.fetchAccount(ACCOUNT_ID)
+
+    expect(account.bankData.hasReservedBalance).toBe(true)
+
+    const [reserved] = account.bankData.reservedBalances
+    expect(reserved.name).toBe('Caixinha Para Férias')
+    expect(reserved.identification).toBe('reservation-1')
+
+    expect(reserved.availableAmounts).toHaveLength(1)
+    expect(reserved.availableAmounts[0].amount).toBe(250.5)
+    expect(reserved.availableAmounts[0].currencyCode).toBe('BRL')
+    expect(reserved.availableAmounts[0].remuneration.indexer).toBe('CDI')
+
+    expect(mock.isDone()).toBeTruthy()
+  })
+
+  it('leaves reserved balance fields null when the account has none', async () => {
+    const mock = nock(API_URL)
+      .get(`/accounts/${ACCOUNT_ID}`)
+      .reply(200, {
+        ...accountWithReservedBalances,
+        bankData: {
+          ...accountWithReservedBalances.bankData,
+          hasReservedBalance: false,
+          reservedBalances: null,
+        },
+      })
+
+    const client = new PluggyClient({ clientId: '123', clientSecret: '456' })
+    const account = await client.fetchAccount(ACCOUNT_ID)
+
+    expect(account.bankData.hasReservedBalance).toBe(false)
+    expect(account.bankData.reservedBalances).toBeNull()
+    expect(mock.isDone()).toBeTruthy()
+  })
+})