What is Port Pricing?

What you rent is an endpoint - a host, a port number and credentials - backed by one modem for the term. Data is described as unlimited or capped by the SIM's plan, with throttling once the bundle runs out, and providers often attach a concurrency ceiling and a rotation policy to the same port. The wording confuses people, since a rented port is a commercial unit rather than the TCP port in your proxy string, even though the two are usually the same integer.

The model is predictable and suits one identity using a single address heavily and continuously, such as account warming, long-lived logins or a job pulling steady volume through one IP. It scales badly across breadth. Twenty markets and forty parallel identities means forty rentals billed whether they run or not, and an idle port is pure loss. Look at the extras as well - setup fees, charges to change country, per-rotation costs and minimum terms that outlast the campaign.

Comparing a port rental with per-gigabyte billing takes one division. Divide the monthly fee by the gigabytes you push through that port to get an effective rate, then compare. Below your crossover volume the metered plan is cheaper; above it the flat port wins. Most teams overestimate what they will consume. Some networks take one side of that comparison away, PROXIES.SX among them, with no per-port charge and no monthly fee, so the endpoint count becomes a technical decision rather than a cost.

Whichever way you buy, count endpoints for what they give you beyond data. A separate egress per identity keeps accounts isolated, so one flagged address leaves the rest alone, and a stable entry point is what IP whitelists and firewall rules attach to. Those are reasons to hold several endpoints even on a metered plan, and they explain why per-port pricing persists, since it maps directly to hardware someone keeps powered.