diff --git a/backend/src/__tests__/e2e/demo-flow.test.ts b/backend/src/__tests__/e2e/demo-flow.test.ts
index 42ad154..2f8dade 100644
--- a/backend/src/__tests__/e2e/demo-flow.test.ts
+++ b/backend/src/__tests__/e2e/demo-flow.test.ts
@@ -50,6 +50,9 @@ const { mockBalanceOf, mockGetReserves, mockTotalSupply, mockToken0 } = vi.hoist
 }));
 
 vi.mock("../../providers/chain.provider", () => ({
+  getProvider: vi.fn(() => ({
+    estimateGas: vi.fn().mockResolvedValue(100_000n),
+  })),
   getContract: vi.fn(() => ({
     balanceOf:    mockBalanceOf,
     getReserves:  mockGetReserves,
diff --git a/backend/src/__tests__/integration/routes.test.ts b/backend/src/__tests__/integration/routes.test.ts
index 38ffff2..67bd913 100644
--- a/backend/src/__tests__/integration/routes.test.ts
+++ b/backend/src/__tests__/integration/routes.test.ts
@@ -66,6 +66,9 @@ vi.mock("../../modules/liquid-staking/config/staking-pools", () => ({
 
 // Prevent real chain calls from getContract
 vi.mock("../../providers/chain.provider", () => ({
+  getProvider: vi.fn(() => ({
+    estimateGas: vi.fn().mockResolvedValue(100_000n),
+  })),
   getContract: vi.fn(() => ({
     balanceOf: mockBalanceOf,
     getReserves: vi.fn().mockResolvedValue([1_000_000n, 2_000_000n, 0n]),
diff --git a/backend/src/__tests__/modules/liquid-staking/prepare-claim-rewards.test.ts b/backend/src/__tests__/modules/liquid-staking/prepare-claim-rewards.test.ts
index 6942a27..4172583 100644
--- a/backend/src/__tests__/modules/liquid-staking/prepare-claim-rewards.test.ts
+++ b/backend/src/__tests__/modules/liquid-staking/prepare-claim-rewards.test.ts
@@ -13,6 +13,12 @@ vi.mock("../../../config/chains", () => ({
   })),
 }));
 
+vi.mock("../../../providers/chain.provider", () => ({
+  getProvider: vi.fn(() => ({
+    estimateGas: vi.fn().mockResolvedValue(100_000n),
+  })),
+}));
+
 vi.mock("../../../shared/services/aerodrome.service", () => ({
   aerodromeService: {
     resolvePoolAndGauge: vi.fn(),
diff --git a/backend/src/__tests__/modules/liquid-staking/prepare-enter-strategy.test.ts b/backend/src/__tests__/modules/liquid-staking/prepare-enter-strategy.test.ts
index 0fa678d..f0a8ee8 100644
--- a/backend/src/__tests__/modules/liquid-staking/prepare-enter-strategy.test.ts
+++ b/backend/src/__tests__/modules/liquid-staking/prepare-enter-strategy.test.ts
@@ -26,6 +26,9 @@ vi.mock("../../../shared/services/aerodrome.service", () => ({
 }));
 
 vi.mock("../../../providers/chain.provider", () => ({
+  getProvider: vi.fn(() => ({
+    estimateGas: vi.fn().mockResolvedValue(100_000n),
+  })),
   getContract: vi.fn(() => ({
     balanceOf: vi.fn().mockResolvedValue(10_000n),
   })),
diff --git a/backend/src/__tests__/modules/liquid-staking/prepare-exit-strategy.test.ts b/backend/src/__tests__/modules/liquid-staking/prepare-exit-strategy.test.ts
index de0962e..bc0608f 100644
--- a/backend/src/__tests__/modules/liquid-staking/prepare-exit-strategy.test.ts
+++ b/backend/src/__tests__/modules/liquid-staking/prepare-exit-strategy.test.ts
@@ -25,6 +25,9 @@ vi.mock("../../../shared/services/aerodrome.service", () => ({
 }));
 
 vi.mock("../../../providers/chain.provider", () => ({
+  getProvider: vi.fn(() => ({
+    estimateGas: vi.fn().mockResolvedValue(100_000n),
+  })),
   getContract: vi.fn(() => ({
     balanceOf: vi.fn().mockResolvedValue(10_000n),
     getReserves: vi.fn().mockResolvedValue([1_000_000n, 2_000_000n, 0n]),
diff --git a/backend/src/__tests__/modules/swap/prepare-swap.test.ts b/backend/src/__tests__/modules/swap/prepare-swap.test.ts
index 4ead1d6..1ce91c3 100644
--- a/backend/src/__tests__/modules/swap/prepare-swap.test.ts
+++ b/backend/src/__tests__/modules/swap/prepare-swap.test.ts
@@ -11,6 +11,12 @@ vi.mock("../../../config/chains", () => ({
   })),
 }));
 
+vi.mock("../../../providers/chain.provider", () => ({
+  getProvider: vi.fn(() => ({
+    estimateGas: vi.fn().mockResolvedValue(100_000n),
+  })),
+}));
+
 vi.mock("../../../shared/services/aerodrome.service", () => ({
   aerodromeService: {
     getQuote: vi.fn(),
diff --git a/backend/src/__tests__/shared/services/aerodrome.service.test.ts b/backend/src/__tests__/shared/services/aerodrome.service.test.ts
index 9ba1b52..f71f393 100644
--- a/backend/src/__tests__/shared/services/aerodrome.service.test.ts
+++ b/backend/src/__tests__/shared/services/aerodrome.service.test.ts
@@ -3,6 +3,9 @@ import { ethers } from "ethers";
 
 // Mock chain.provider and protocols before importing the service
 vi.mock("../../../providers/chain.provider", () => ({
+  getProvider: vi.fn(() => ({
+    estimateGas: vi.fn().mockResolvedValue(100_000n),
+  })),
   getContract: vi.fn(),
 }));