When you purchase a predictor tool or service, whether it's a one-time purchase or a subscription depends on the specific product or service you've bought.

1. One-Time Purchase:

- If the predictor is a software or tool that you download and install, it could be a one-time purchase. This means you pay once, and you can use the tool indefinitely or until it becomes outdated.

2. Subscription-Based:

- Some predictor tools, especially those that provide ongoing updates or are web-based, may require a subscription. In this case, you might need to pay monthly, yearly, or according to some other schedule to continue using the service.