Why monitor affiliate links at all? The silent-revenue-leak problem

Most website problems are loud. The page throws a 500, the form stops submitting, the layout breaks on mobile and someone emails you about it. You find out because something visibly stops working.

Broken affiliate links are the opposite. They're the quietest failure a publisher has, and that's exactly what makes them expensive.

The failure that doesn't look like a failure

Here's the scenario that costs people the most money, because nothing about it looks wrong.

You wrote a review two years ago. It ranks well, it gets steady traffic, and it carries a handful of affiliate links to the products you recommended. One of those products got discontinued. The retailer, being tidy, set up a redirect: the old product URL now points at a category page. Your link still works. A reader clicks it, lands on a page full of vaguely related products, shrugs, and leaves. No error. No 404. No sign that anything changed. The commission that link used to earn is simply gone, and will stay gone, and nothing on your site will ever tell you.

Multiply that by an archive of hundreds of posts and years of accumulated links, and you have a slow leak. Traffic holds steady. Rankings hold steady. Earnings drift down by a few percent a month and you assume it's the season, or the network changing its rates, or just how things are going lately.

Why the usual defences miss it

The instinct is to say: I'd notice. But the ordinary ways you'd notice all fail on this specific problem.

• You don't click your own old links. Nobody re-reads their two-year-old posts and tests every outbound link. The pages that leak the most are the ones you never look at.
• Analytics won't flag it. Google Analytics sees the click leave your site. It has no idea the destination is wrong or the tag is missing.
• The affiliate dashboard shows an absence, not an alert. A stripped tag doesn't produce an error in your Amazon Associates report — the click just never appears. You can't get alerted about a number that quietly fails to go up.
• "The link works" is a trap. The single most common check — does the link resolve? — passes for almost every one of these failures. A redirect resolves. A tag-stripped link resolves. Resolving is not the same as earning.

So the defences you'd expect to catch it are all looking at the wrong thing. They check whether the link is alive. The question that matters is whether the link still does its job.

What monitoring actually watches for

Monitoring affiliate links means checking, on a schedule, the things that silently break:

• Does the link still reach a real product page — or does it now redirect to a category, a homepage, or an "out of stock" placeholder?
• Did your tracking tag survive? For every affiliate link, is the parameter that credits your account still present, and still yours?
• Did the destination change in a way that matters — a product replaced, a network migrated, a URL quietly rewritten by a plugin or cache?

These are exactly the checks that are tedious to do by hand and easy for a machine to do repeatedly. That's the whole pitch: the failures are invisible to humans and obvious to a crawler that knows what to look for.

What monitoring buys you

Three concrete things.

You find out in days, not quarters. The gap between a link breaking and you noticing shrinks from "whenever the earnings finally look wrong enough to investigate" to "the next scheduled scan." That gap is money.

You fix the highest-value pages first. A monitor tells you which broken links are on your best-performing pages, so you spend your maintenance time where it pays back, instead of guessing.

You stop worrying about the archive. The real cost of link rot isn't any single broken link — it's the low-grade anxiety that some unknown number of your old posts are quietly leaking, and no way to know without a manual audit nobody has time for. Monitoring replaces "I hope my old links are fine" with "I'd know if they weren't."

The honest limitation

Monitoring doesn't fix anything. It tells you. You still have to update the broken link, restore the stripped tag, or swap the discontinued product for one that's in stock. What it removes is the part that actually costs you: the months of silent leaking before you find out there's anything to fix.

That's the case for watching affiliate links at all. Not because links break — everyone knows links break — but because these links break without ever looking broken, and the only way to catch a failure that leaves no trace is to go looking for it on purpose, over and over, forever. Which is a job for a machine.

If you want to see what's currently broken on your own site, the free scan reads your live pages and gives you a verdict in about a minute — no signup, nothing to install.