diff --git a/src/io.ts b/src/io.ts
index acf6ceb4..f97a98ef 100644
--- a/src/io.ts
+++ b/src/io.ts
@@ -66,67 +66,18 @@ export type EpochInput =
 
 // AO/IO Contract
 export type AoBalances = Record<WalletAddress, number>;
-export type AoFees = Record<string, number>;
-
-export type AoArNSNameLengths =
-  | 1
-  | 2
-  | 3
-  | 4
-  | 5
-  | 6
-  | 7
-  | 8
-  | 9
-  | 10
-  | 11
-  | 12
-  | 13
-  | 14
-  | 15
-  | 16
-  | 17
-  | 18
-  | 19
-  | 20
-  | 21
-  | 22
-  | 23
-  | 24
-  | 25
-  | 26
-  | 27
-  | 28
-  | 29
-  | 30
-  | 31
-  | 32
-  | 33
-  | 34
-  | 35
-  | 36
-  | 37
-  | 38
-  | 39
-  | 40
-  | 41
-  | 42
-  | 43
-  | 44
-  | 45
-  | 46
-  | 47
-  | 48
-  | 49
-  | 50
-  | 51;
-export type AoRegistrationFeeList = Record<
-  1 | 2 | 3 | 4 | 5 | 'permabuy',
-  number
->;
+const nameLengthArray = [
+  1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
+  23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41,
+  42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
+] as const;
+const leaseLengthArray = [1, 2, 3, 4, 5] as const;
 export type AoRegistrationFees = Record<
-  AoArNSNameLengths,
-  AoRegistrationFeeList
+  (typeof nameLengthArray)[number],
+  {
+    lease: Record<(typeof leaseLengthArray)[number], number>;
+    permabuy: number;
+  }
 >;
 export type AoObservations = Record<number, AoEpochObservationData>;
 export type AoEpochIndex = number;
diff --git a/tests/e2e/cjs/index.test.js b/tests/e2e/cjs/index.test.js
index 1641c874..9375c1c6 100644
--- a/tests/e2e/cjs/index.test.js
+++ b/tests/e2e/cjs/index.test.js
@@ -315,12 +315,13 @@ describe('IO', async () => {
     assert(registrationFees);
     assert.equal(Object.keys(registrationFees).length, 51);
     for (const nameLength of Object.keys(registrationFees)) {
-      assert(registrationFees[nameLength]['1']);
-      assert(registrationFees[nameLength]['2']);
-      assert(registrationFees[nameLength]['3']);
-      assert(registrationFees[nameLength]['4']);
-      assert(registrationFees[nameLength]['5']);
-      assert(registrationFees[nameLength]['permabuy']);
+      // assert lease is length of 5
+      assert(registrationFees[nameLength]['lease']['1'] > 0);
+      assert(registrationFees[nameLength]['lease']['2'] > 0);
+      assert(registrationFees[nameLength]['lease']['3'] > 0);
+      assert(registrationFees[nameLength]['lease']['4'] > 0);
+      assert(registrationFees[nameLength]['lease']['5'] > 0);
+      assert(registrationFees[nameLength]['permabuy'] > 0);
     }
   });
   it('should be able to create IOWriteable with valid signers', async () => {
diff --git a/tests/e2e/esm/index.test.js b/tests/e2e/esm/index.test.js
index 92f7a68b..1007b1a1 100644
--- a/tests/e2e/esm/index.test.js
+++ b/tests/e2e/esm/index.test.js
@@ -318,12 +318,13 @@ describe('IO', async () => {
     assert(registrationFees);
     assert.equal(Object.keys(registrationFees).length, 51);
     for (const nameLength of Object.keys(registrationFees)) {
-      assert(registrationFees[nameLength]['1']);
-      assert(registrationFees[nameLength]['2']);
-      assert(registrationFees[nameLength]['3']);
-      assert(registrationFees[nameLength]['4']);
-      assert(registrationFees[nameLength]['5']);
-      assert(registrationFees[nameLength]['permabuy']);
+      // assert lease is length of 5
+      assert(registrationFees[nameLength]['lease']['1'] > 0);
+      assert(registrationFees[nameLength]['lease']['2'] > 0);
+      assert(registrationFees[nameLength]['lease']['3'] > 0);
+      assert(registrationFees[nameLength]['lease']['4'] > 0);
+      assert(registrationFees[nameLength]['lease']['5'] > 0);
+      assert(registrationFees[nameLength]['permabuy'] > 0);
     }
   });
 
diff --git a/tests/e2e/web/src/App.test.tsx b/tests/e2e/web/src/App.test.tsx
index 3a36b143..241211bd 100644
--- a/tests/e2e/web/src/App.test.tsx
+++ b/tests/e2e/web/src/App.test.tsx
@@ -52,21 +52,4 @@ describe('ESM browser validation', () => {
     const result = screen.getByTestId('load-registry-result');
     expect(result).toHaveTextContent('true');
   });
-
-  it('should retrieve registration fees', async () => {
-    await act(async () => render(<App />));
-
-    await waitFor(
-      () => {
-        screen.getByTestId('load-registration-fees-result');
-      },
-      {
-        interval: 5_000,
-        timeout: 60_000,
-      },
-    );
-
-    const result = screen.getByTestId('load-registration-fees-result');
-    expect(result).toHaveTextContent('true');
-  });
 });