Yes. The monthly Unlimited Jobs Plan is set to automatically recur each month, but it can be canceled at any time and there is no minimum commitment.
If you are looking to just try this out for one month, you can make your purchase and then cancel your subscription.
You will still have access for the rest of your billing cycle and by cancelling immediately, you won't be charged for a second month.
To cancel the subscription from your account: click on Settings, click on Billing, and then under Recurring Subscriptions, click Cancel.