Aside from the connection API - What we do it we have a mapping of ASNs that are flagged as metered. When your client comes online we take the IP, map to the ASN and determine if it is able to upload (e.g. on cellular/metered etc). We buy this data today and you can always drop an email to [email protected] with your IP and we will add it in. We also prioritize upload partners for known ASNs (e.g. you're more likely to be chosen for upload if you are on Verizon Business than Verizon Fios than Telstra).