LinkBourse

The answer on the page where you ask the question

Nobody finds donor sites by browsing a catalogue. They search their topic, read the results, and think “a link from that one would be worth having” — and then every marketplace makes them leave the page, open a catalogue and search again by domain, one at a time. This puts the answer under the result: whether the site sells links here, from how much, and what our own nightly readings found on the links already sold on it.

LinkBourse · from $180 · DR 54 · 97% held over 214 nights · live in ~4d

What one badge looks like. Everything after the price is measured by us: the share of nightly readings that found the link exactly as sold, over the number of nights we have been reading. A domain with fewer than five readings shows the count instead of a percentage — one night is not a record.

Install it

It is not in the Chrome Web Store yet. Until it is, the load-unpacked route takes a minute and gives you exactly the same thing — with the advantage that you can read every line of it first, which is worth doing before you let anything watch your search results.

  1. 1. Download the extension (version 1.0.0) and unzip it.
  2. 2. Open chrome://extensions and turn on Developer mode, top right.
  3. 3. Press “Load unpacked” and choose the unzipped folder.
  4. 4. Search for anything on Google. Sites we list get a line under the result; nothing else on the page changes.

What it sends, and what it does not

One request per results page, carrying the domains on it and nothing else — not your query, not the URLs, not who you are. There is no account, no key and no login: everything it shows is already on the public listing pages, so there is nothing to sign in to. It reads no page but a search results page and the address bar of the tab you open the popup on.

It answers from /api/extension/lookup, which is public and documented in the source. If you would rather call it yourself than install anything, that is a perfectly good way to use it — and the fuller version, with your own orders and their readings, is the API.

Also in the popup

Open it while reading any site and it says whether that domain sells links here, at what price, in which rel, how long a placement typically takes to go live, and whether ownership was proved or merely claimed. If it is your own site and it is not listed, it takes a few minutes to list it.