Unfortunately, as of now, our system only supports Amazon marketplaces, and we do not support Walmart, eBay, or Shopify marketplaces.
Every marketplace behaves differently, so we must develop algorithms for each store and category and consider specific sales velocity. To ensure that we have the most accurate sales estimates available for you, gathering and processing the hundreds of millions of data points needed to achieve this requires some time.
In the meantime, you can see a comprehensive list of which product feature is available or each of the Amazon marketplaces we support in our Help Center → List of SupportedCountries (Amazon Marketplaces)