The quick answer: any Jar created with one of our partner merchants, featured on the Explore screen of the app.
The details: HyperJar has partnered with some of the best-known merchants in the UK. When you create a Jar with one of them it's called a Merchant Jar. Advance payments made to these Jars get a 4.8% Annual Growth Rate (AGR) from our partners, calculated and added to your Jar daily to boost your spending power with them.
You can find the list of our partners, and the terms and conditions that apply to their advance payment and reward offers, in the Explore section of the app.
You can spend the advance payments in these Jars and any rewards with that merchant using your HyperJar card.