No — Cash Sans isn’t listed as a free font. The link at the top of this page goes to the source, where you can check licence options.
Our typeface is Cash Sans, a customized version of Söhne by Klim Type Foundry. A neo-grotesque sans serif, it offers a range of styles, allowing it to perform equally well in a variety of contexts: expressive headlines, body text, and small sizes.
A1 features 2 websites using Cash Sans, including Buzz and Cash App. They lean towards Big type, Fun, and Illustration design styles.