If you source links from both pr-x.net and serpzilla.com, one number decides how much you overwrite yourself: how much do their site databases overlap? We matched both catalogs on the normalized domain (lowercased, no scheme or www) inside our Backlink Pricing dataset.
The overlap
The two databases share 24,134 domains — 71% of pr-x.net and 18% of serpzilla.com. As a Jaccard index (shared ÷ combined) the catalogs are 17% identical, so about 83% of the combined pool is exclusive to one side.
Unique inventory
- 9,781 domains on pr-x.net only (29% of its catalog).
- 107,387 domains on serpzilla.com only (82% of its catalog).
Where they overlap, who's cheaper?
For the 24,134 shared domains priced on both platforms, comparing the cheapest listing on each:
On identical inventory, pr-x.net is the cheaper source 26% of the time (median $72 vs $68 for the same sites). The average absolute price gap per shared domain is $38 — always price-check a placement across platforms before buying.
Quality (Domain Rating)
| DR band | On both | pr-x.net only | serpzilla.com only |
|---|---|---|---|
| DR 80–100 | 0% | 1% | 1% |
| DR 60–79 | 3% | 5% | 4% |
| DR 40–59 | 17% | 9% | 14% |
| DR 20–39 | 22% | 23% | 29% |
| DR 0–19 | 58% | 63% | 53% |
Median DR: 14 shared, 13 pr-x.net-exclusive, 17 serpzilla.com-exclusive.
Geography
| # | pr-x.net | domains | serpzilla.com | domains |
|---|---|---|---|---|
| 1 | United States | 4,235 | United States | 14,578 |
| 2 | India | 1,854 | France | 6,720 |
| 3 | United Kingdom | 685 | Russia | 5,564 |
| 4 | France | 680 | India | 5,431 |
| 5 | DK | 423 | Germany | 4,113 |
| 6 | Ukraine | 411 | Italy | 3,247 |
FAQ
Does "on both" mean the same seller?
Not necessarily — a domain can be listed on both marketplaces by the same publisher or different resellers. What's shared is the placement opportunity, which is what you dedupe before buying.
Is a bigger database always better?
No. Overlap, price spread, DR/traffic quality and geography decide value for a specific campaign. Comparing databases is how you buy the same link for less and find inventory a single platform can't offer.