Founded 2024. Headquartered in Kingston, Herefordshire. Built by two practitioners who got burned by bad Amazon data before they built the fix.
01 · Who we serve
The Amazon seller data market has a structural gap: cheap scraped lists deliver 30–40% bounce rates and no company registration context. Bespoke research costs £3–10 per lead and takes weeks. Neither option works for agencies and service businesses that need verified, current data at volume.
The Sellers Index was founded in 2024 to occupy the space between those two failure modes — systematic verification at £1.25–£5.00 per lead, with four fields no scraped provider can offer: VAT number, base country, active marketplaces, and a seller business summary sourced from national registries.
02 · How we verify
Every record passes through four mandatory checkpoints. Fail any one — suppressed, not flagged. We do not ship partially verified data.
Every record is verified against Companies House (UK), Handelsregister (Germany), and INSEE SIRENE (France). Records without a traceable business registration are suppressed before delivery.
VAT numbers are validated in real time via the EU VIES system at the point of enrichment. This is the data compliance buyers require — and the field scraped providers cannot produce.
Every email address undergoes a live SMTP handshake to confirm the mailbox exists and accepts mail before inclusion. Not a format check. Not a domain ping. A full deliverability test, repeated at every 30-day re-verification cycle.
No record older than 30 days reaches a delivered dataset. Every record in the verified seller database is re-verified on a rolling cycle — not batch-refreshed annually. Sellers change status. Storefronts close. We track it.
Verified records are enriched to 11 fields: seller ID, trading name, legal name, base country, active marketplaces, VAT number, verified email, domain, business summary, product categories, and seller summary. Our Full Intelligence tier adds tech stack, traffic indicators, and revenue estimates.
We operate under GDPR legitimate interests for B2B data. All records relate to registered business entities, not private individuals. The business is ICO registered in the United Kingdom. Any seller may request removal via [email protected] — processed within 72 hours. See our GDPR compliance framework.
03 · Verified vs scraped
You've bought seller lists before. You know the pattern.
Forty percent bounce. Half the storefronts closed. The emails are generic info@ addresses that go nowhere. The data is six months old, recycled from the same sources everyone else uses.
According to Marketplace Pulse, Amazon's seller base is in constant flux — a scraper with no SMTP or registry checks contains 30–40% stale contacts by delivery. Your SDRs are paying for that with their time.
The Sellers Index occupies the middle ground: systematic verification at £1.25–£5.00 per lead. Verified VAT numbers. Confirmed emails. Base-country flags. Data that compliance buyers require — sourced from registries, not Amazon storefronts.
See the full data schema →Scraped lists
The Sellers Index
04 · Trust and compliance
Five credentials underpin every delivered dataset. Specifically designed for buyers in compliance-sensitive industries.
UK data protection compliant under GDPR Article 6(1)(f) legitimate interests. B2B contact data only — no private individuals.
Security verified annually against UK government standards. Infrastructure audited, not self-assessed.
Payment processing at the highest grade. No card data stored on our systems — ever.
No record older than 30 days at point of sale. Enforced by the rolling verification cycle — not a policy, a pipeline constraint.
Any seller may request removal via [email protected]. Processed within 72 hours. No bureaucracy.
05 · The founders
Co-founder · United Kingdom
Twenty years in UK ecommerce and brand building — from high-street retail to Amazon FBA. When I tried to source reliable B2B seller data for our own outreach, the process was baffling. Poor quality scraped lists, high bounce rates, and nobody providing the actual intelligence needed to close deals.
That's why The Sellers Index exists.
Co-founder · Estonia
Based in Tallinn — inside the EU. A decade navigating ecommerce, B2B data intelligence, and marketplace dynamics while running my own brands across European markets. When Mark and I met, the idea was obvious: turn our combined knowledge into a verified data platform that actually works for B2B outreach.
One platform. Verified intelligence. Handled properly.
Registered: 61 Bridge Street, Kingston, Herefordshire, HR5 3DJ, United Kingdom
06 · Common questions
About the Sellers Index team: co-founded in 2024 by Mark (UK, ecommerce and Amazon FBA background) and Kristoph (B2B data intelligence and European marketplace dynamics). Registered at 61 Bridge Street, Kingston, Herefordshire, HR5 3DJ.
Each record passes through four stages: company registry check (Companies House, Handelsregister, INSEE SIRENE), VIES VAT validation, SMTP deliverability testing, and a rolling 30-day re-verification cycle. Records that fail any stage are suppressed rather than flagged for manual review.
The Sellers Index covers Amazon UK, USA, Germany, France, Spain, and Italy — 6 marketplaces in total. Each record includes up to 11 enriched fields: verified email, VAT number, base country, active marketplaces, and seller summary. Coverage also includes cross-border sellers from outside their primary market.
Every record is re-verified on a rolling 30-day cycle. Because email deliverability is retested at each refresh, no record older than 30 days is delivered. The 30-day freshness guarantee is contractual.
Scraped lists contain no registry verification, no VAT validation, and no SMTP testing. The Sellers Index runs all three before delivery, producing verified VAT numbers and base-country flags that compliance buyers require — data that scraped lists cannot produce.
Get 4 verified seller records for free. Test our deliverability yourself — one record per tier.
