diff --git a/packages/api-kit/src/SafeApiKit.ts b/packages/api-kit/src/SafeApiKit.ts
index 5e6babc8a..a553bae02 100644
--- a/packages/api-kit/src/SafeApiKit.ts
+++ b/packages/api-kit/src/SafeApiKit.ts
@@ -262,10 +262,10 @@ class SafeApiKit {
       // FIXME remove when the transaction service returns the singleton property instead of masterCopy
       if (!response?.singleton) {
         const { masterCopy, ...rest } = response
-        return { ...rest, singleton: masterCopy } as SafeInfoResponse
+        return { ...rest, singleton: masterCopy, nonce: Number(response.nonce) } as SafeInfoResponse
       }
 
-      return response as SafeInfoResponse
+      return { ...response, nonce: Number(response.nonce) } as SafeInfoResponse
     })
   }
 
@@ -851,6 +851,16 @@ class SafeApiKit {
     return sendRequest({
       url: `${this.#txServiceBaseUrl}/v1/safe-operations/${safeOperationHash}/`,
       method: HttpMethod.Get
+    }).then((response: any) => {
+      return {
+        ...response,
+        nonce: Number(response.nonce),
+        callGasLimit: Number(response.callGasLimit),
+        verificationGasLimit: Number(response.verificationcallGasLimit),
+        preVerificationGas: Number(response.preVerificationGas),
+        maxFeePerGas: Number(response.maxFeePerGas),
+        maxPriorityFeePerGas: Number(response.maxPriorityFeePerGas)
+      } as SafeOperationResponse
     })
   }
 
diff --git a/packages/api-kit/tests/e2e/getSafeOperationsByAddress.test.ts b/packages/api-kit/tests/e2e/getSafeOperationsByAddress.test.ts
index 95a283d9b..da7202eca 100644
--- a/packages/api-kit/tests/e2e/getSafeOperationsByAddress.test.ts
+++ b/packages/api-kit/tests/e2e/getSafeOperationsByAddress.test.ts
@@ -56,14 +56,23 @@ describe('getSafeOperationsByAddress', () => {
       chai.expect(safeOperation.userOperation).to.have.property('ethereumTxHash')
       chai.expect(safeOperation.userOperation).to.have.property('sender').to.eq(SAFE_ADDRESS)
       chai.expect(safeOperation.userOperation).to.have.property('userOperationHash')
-      chai.expect(safeOperation.userOperation).to.have.property('nonce')
+      chai.expect(safeOperation.userOperation).to.have.property('nonce').to.be.a('number')
       chai.expect(safeOperation.userOperation).to.have.property('initCode')
       chai.expect(safeOperation.userOperation).to.have.property('callData')
-      chai.expect(safeOperation.userOperation).to.have.property('callGasLimit')
-      chai.expect(safeOperation.userOperation).to.have.property('verificationGasLimit')
-      chai.expect(safeOperation.userOperation).to.have.property('preVerificationGas')
-      chai.expect(safeOperation.userOperation).to.have.property('maxFeePerGas')
-      chai.expect(safeOperation.userOperation).to.have.property('maxPriorityFeePerGas')
+      chai.expect(safeOperation.userOperation).to.have.property('callGasLimit').to.be.a('number')
+      chai
+        .expect(safeOperation.userOperation)
+        .to.have.property('verificationGasLimit')
+        .to.be.a('number')
+      chai
+        .expect(safeOperation.userOperation)
+        .to.have.property('preVerificationGas')
+        .to.be.a('number')
+      chai.expect(safeOperation.userOperation).to.have.property('maxFeePerGas').to.be.a('number')
+      chai
+        .expect(safeOperation.userOperation)
+        .to.have.property('maxPriorityFeePerGas')
+        .to.be.a('number')
       chai.expect(safeOperation.userOperation).to.have.property('paymaster')
       chai.expect(safeOperation.userOperation).to.have.property('paymasterData')
       chai.expect(safeOperation.userOperation).to.have.property('signature')