You can cancel your market quotes subscriptions:

For iOS users:

1. Go to your iPhone's "Settings"

2. Tap "Apple ID"

3. Tap "Subscriptions"

4. Tap the market quotes subscription you would like to cancel and tap "Unsubscribe"

For Android users:

1. Go to "Google Play Store"

2. Tap your "Account"

3. Tap "Payments and subscriptions"

4. Tap the "Subscriptions"

5. Tap the market quotes subscription you would like to cancel and tap "Cancel Subscriptions"