Service telemetry
Accuracy leaderboard — per-source confidence scores
We publish monthly accuracy stats per source. Currently averaging 87% on email verification, 94% on company website, 91% on DUNS. No black-box — see exactly which source returned what.
Accuracy leaderboard
10 live sources · last 30 days · 100K+ records enriched
| Source | Coverage | Email accuracy | Website accuracy | Tax ID accuracy | Phone accuracy | Last 30d records | Trend |
|---|---|---|---|---|---|---|---|
| DuckDuckGo | Global | 78% | 89% | n/a | n/a | 12K | stable |
| Bing | Global | 81% | 91% | n/a | n/a | 14K | up |
| Global | 82% | 92% | n/a | n/a | 15K | up | |
| Clearbit | Global | 91% | 95% | n/a | 85% | 18K | stable |
| SAM.gov | USA | n/a | 99% | 99% (DUNS+EIN) | n/a | 3K | stable |
| OpenCorporates | Global | n/a | 96% | 88% | n/a | 8K | stable |
| UK Companies House | UK | n/a | 99% | 99% (company_number) | n/a | 2K | stable |
| BR CNPJ ReceitaWS | Brazil | n/a | 99% | 99% (CNPJ) | n/a | 1.5K | stable |
| EU VAT VIES | EU | n/a | n/a | 97% (VAT) | n/a | 1K | stable |
| Website scraping | Global | 85% | 95% | n/a | 76% | 22K | up |
Green: ≥90% accuracy · amber: 80-90% · gray: <80% or n/a. Stats sourced from the public NexusCold MCP server telemetry.
SLA guarantee
Our accuracy SLA
If we don't return at least 80% valid fields on any enriched record, that record is free.
Auto-refund applies to your next billing cycle. No need to contact support.
Methodology
How we measure accuracy
Sample size: last 30 days, 100K+ records enriched across all sources.
- Email — SMTP verification + catch-all detection + deliverability score.
- Website — HTTP HEAD request + domain validation + SSL cert check.
- Tax IDs — direct registry validation (SAM.gov API, ReceitaWS API, VIES API, etc.).
- Phone — E.164 format validation + carrier lookup (where available).
Historical trend
Monthly trend — average accuracy
6 months · averaged across all sources
100%
90%
80%
70%
83%Apr
85%May
86%Jun
87%Jul
87%Aug
87%Sep
Last 6 months+4 pts in 6 months
Want to see real-time accuracy?
The MCP server returns a `_source` and `_confidence` field for every enriched field. Audit where each piece of data came from.