Q: What IP address would eBay see
A: When you authorize the application via eCom Syndicator or WooHosted in your eBay account, eBay obtains your IP. this marketplace, therefore, has the ability to see your IP when using the application.
Note: If you're listing, then Wise Lister would also have to be authorized in your eBay account, but again, that is a different entity and is not Sku Grid itself.