Hello Ganon,
If you’re querying the data for one sensor, the initial one million points can provide several years of data. A user commented about this here: PaymentRequiredError making api calls - #14 by dpattee.
If you never received the initial one million points, please contact us at contact@purpleair.com.
If you are on the same network as the sensor, you can visit its IP address with /json to get the data locally without using the API.
We agree that you shouldn’t have to pay for your personal sensor’s data and are looking for ways to improve and implement this in the future. We appreciate your feedback and welcome any other suggestions.