§ 04 · Instrument · Live
Freshness Lag
Planted sentinel pages with known publish times, probed every 6 hours. The lag between a page existing and a vendor being able to retrieve it.
9.4 hmedian time-to-retrievability, all vendors−12% vs prior 7d
48 sentinel pages · Kaplan–Meier, right-censored 30d · 24-cell matrix: domain age × rendering × discoverability × region
Tavily
Serper
Exa
Brave
Jun 03Jun 04Jun 05Jun 06Jun 07Jun 08Jun 09
§ 04.1
Per Vendor
| Vendor | retrievability h | extraction h | fresh-domain penalty × | censored @30d % |
|---|---|---|---|---|
| 1Tavily | 7.8 | 0.4 | 1.9 | 4.2 |
| 2Serper | 10.6 | 0.3 | 2.8 | 6.3 |
| 3Exa | 11.2 | 0.5 | 3.4 | 8.3 |
| 4Brave | 13.9 | 0.4 | 2.2 | 10.4 |
| 5Firecrawl | 15.4 | 0.2 | 4.1 | 12.5 |
Extraction is near-instant everywhere — fetch-on-demand works. The spread is in retrievability: index freshness is the real differentiator.