For me it's free (I joined a long time ago), but their support team told me they're rolling out a paid subscription program on certain countries. Should be around $1 per month. My advice is to try Mine out to secure the free plan, or just use one of their competitors. The startup Rita (https://ritapersonaldata.com) also got funded recently and seem to get high reviews... Source: about 2 years ago

Go is a statically typed, compiled programming language designed at Google, it is syntactically similar to C, but with memory safety, garbage collection, structural typing, and CSP-style concurrency. In my case, I needed to run Go for JSON schema validations, in other cases, you might want to perform a CPU-intensive task or use a CLI tool written in Go. - Source: dev.to / about 2 years ago