Two providers promise your unused traffic rolls over. Six do not say

Of eight providers' pricing pages we read on 15 August 2026, two state what happens to traffic you paid for and did not use. Six do not mention it at all. On a monthly plan that silence is worth money, and it is not a promise.

What the two say

IPRoyal, on its pricing page:

Control your IP changes with no restrictions, no contracts, and traffic that never expires.

NodeMaven, on its pricing page, and it lists "Traffic rollover" as a plan feature as well:

There are no free plans, but unused traffic always rolls over to the next billing period so you never lose what you paid for.

Both are unambiguous, both are on the page where you are deciding, and both are checkable at the links in the sources below.

What the other six say

Nothing. We looked at the pricing pages of Webshare, Decodo, Oxylabs, Proxy-Cheap, DataImpulse and Bright Data and found no statement either way about unused traffic in the visible text.

That is a finding rather than an accusation. Not stated is not the same as expires, and several of these may well roll traffic over without advertising it. What it does mean is that you cannot know from the page you are buying on, and the number you are comparing is missing a term.

It matters because of how this market bills. Of the 454 plans we track, 402 are billed monthly, 36 are pay as you go and 16 are annual. The monthly majority is exactly where the question bites, and it is the group least likely to answer it.

Why an unused gigabyte is more expensive than it looks

Expiry does not cost you the gigabyte. It costs you the rate.

Buy 100 GB at $2.50 and use 60 of them, and you did not pay $2.50 a gigabyte. You paid $4.17 for every gigabyte you actually used. That is worse than a plan advertised at $3.50 that you would have finished.

Run that across a ladder and the ranking inverts:

What you buy	Rate	You use	Real cost per used GB
100 GB	$2.50	100 GB	$2.50
100 GB	$2.50	60 GB	$4.17
100 GB	$2.50	40 GB	$6.25
30 GB	$3.50	30 GB	$3.50

So the cheaper headline rate loses to the dearer one at any usage below about 70%. This is the same trap as the volume ladder from the other direction: the deep tiers are cheap per gigabyte and only if you fill them, which is most of why the market's prices spread thirtyfold.

Three questions to ask before you buy

1. Does unused traffic carry over, and for how long? Rollover with a 30-day limit is a different product from rollover without one.
2. What happens if I cancel with a balance? A non-expiring balance you cannot access after cancelling has expired by another name.
3. Does topping up extend what I already have? On some pay-as-you-go models a new purchase resets the clock on the old one.

Get the answers in writing from support, because for six of these eight the pricing page will not give them to you. And work out how much you actually need first, since the whole question only matters when you are buying more than you will use.

One last thing about the six that say nothing. Silence is not a policy, and it is also not evidence of a bad one. Several of these providers may roll traffic over perfectly happily and have simply never written it down. What silence removes is your ability to hold them to it later, which is the entire reason to get an answer in writing before you pay rather than after you have lost a month's allowance.