By Lucy Kim, co-founder of Karma.Domains
If you've ever debugged a production system, you know a single snapshot of state rarely explains anything. You need the log: what happened, in what order, and for how long. Evaluating an expired domain works the same way, and that idea is what Karma Score is built on.
The problem with snapshot metrics
Most domain metrics describe a domain right now: how many links, what DR, DA, TF or AS, whether there's traffic. That's useful, but when you buy dropped, auctioned or restored domains, the bigger question is what the site used to be:
- what content it hosted;
- how often and how sharply that content changed;
- whether it went through phases of spam, doorways or junk;
- whether the project developed consistently.
A domain can have a strong link profile today and a toxic past. Link metrics can't see that.
The data source: one, and it's the archive
Karma Score uses one mandatory source: the Wayback Machine. The algorithm reads archived page versions, their text, recurring patterns and the temporal order of changes. It doesn't score a single snapshot. It scores a chain of states.
The algorithm: flags over time
Think of it as a classifier running over each archived period, emitting flags.
Positive flags include meaningful text, thematic consistency, readable structure, no SEO templates, and a stable site type over time.
Negative flags are risk patterns rather than errors: doorways, auto-generated text, SEO spam, parasite pages, sharp topic changes, and empty or placeholder sites.
The final number isn't a sum of points. It's the balance of flags accumulated over time, shown on a 0 to 100 scale.
Why order and duration matter
This is the part that makes it a time-series problem. The score responds to how long a period lasted, the order of events, and whether patterns repeat.
- A short spam period ten years ago: weak negative.
- Normal content alternating with spam: strong negative.
- Years of steady work on one topic: strong positive.
One bad period doesn't sink a domain. Repeated or long negative patterns pull the score down hard. A static metric would treat all three cases the same.
Scale is irrelevant
Karma Score isn't a popularity metric. A small honest site can score high. A huge domain with a spam history scores low. A domain with no links at all can still score high if its content was clean for years.
Karma Score and Karma Metric
We pair it with Karma Metric, which measures how visible and active a domain was in the archive over time. Karma Metric is about volume. Karma Score is about meaning. Used together with backlink authority data, they catch things neither catches alone.
Can it be gamed?
In theory. A carefully maintained doorway or a long-lived artificial project could score decently. In practice those domains show repeating templates and a weak link to Karma Metric, and they stand out in combined analysis. Gaming it means keeping clean content for a long time with no sharp topic changes, which is slow and expensive.
What it isn't
It isn't a Google ranking factor. We don't know Google's internal weights and don't try to reproduce them. It's a research metric and a decision tool for a question we know matters: what happened on this domain before?
Using it in your own pipeline
In the app, Karma Score is a filter: a minimum of 80 is my default for link-building candidates, and under 50 usually signals spam, redirects or a hack. The Pro plan includes API and MCP access, so you can filter by Karma Score in scripts or ask an MCP-compatible assistant for candidates above a threshold.
For a quick single-domain check, I put content history next to link authority. Our free Karma.Domains domain authority checker gives the authority side, and the domain report gives the history. If both look good, the domain earns a closer manual review.