Ecommerce SEO Lab grows organic revenue for US eBay sellers through managed Cassini optimization — title engineering, complete item specifics, and conversion-velocity signals — scaled via programmatic templates for catalogs of 500–100,000+ SKUs. As a specialized ecommerce seo company, we measure success in attributed GMV lift, not impression charts, and run a Month-9 incrementality check: if our work didn’t beat the counterfactual, we tell you to stop paying.
Most eBay sellers hit a revenue plateau because their listings are optimized for keywords Cassini stopped weighting two updates ago.
The algorithm now ranks on relevance, structured data, conversion velocity, and seller health — four levers general SEO agencies and auto-tools ignore.
We rebuild listings around those levers so organic impressions compound into GMV without increasing ad spend.
If you’ve used auto-tools or general SEO agencies for eBay before and didn’t see revenue move, the pattern is almost always the same: keyword-stuffed titles, ignored item specifics, and zero attention to conversion velocity or seller health metrics. Impressions moved. GMV didn’t.
That’s a methodology problem, not an eBay problem. Cassini ranks on four levers — and we optimize all four.
Fix Your Cassini Gaps NowTitle engineering and category precision — mapping buyer-intent keywords to Cassini’s 80-character title structure.
Required, optional, and custom item specifics plus GTIN/MPN/ISBN — every field Cassini filters on.
CTR, CVR, sales velocity, AOV — the signals that tell Cassini your listing deserves the top spot.
Late shipment rate, defect rate, cases closed, policy compliance — revenue protection, not just compliance.
We pull search-term reports from Seller Hub and Terapeak, map to an 80-character template per category, enforce a Brand + Model + Key Attribute + Use Case + Condition structure, and A/B test the top 20 percent of SKUs via Promoted Listings before full rollout.
Metric: Non-brand impression shareOur programmatic template fills every optional specific — not just required — because Cassini filters on Style, Material, Pattern, Feature fields that 90 percent of sellers leave blank. We validate GTIN/MPN/ISBN against GS1 for Google Shopping eligibility.
Metric: Filtered-search impression liftWe restructure HTML descriptions for mobile-first scan: Problem → Solution → Specs → Trust Signals → Cross-sell. We add fitment tables for auto parts, size charts for apparel, compatibility matrices for electronics — each proven to lift CVR 15–30 percent in our testing.
Metric: Organic conversion rate and revenue per listingWe monitor Seller Hub standards daily via API. If late-shipment rate approaches 4 percent, we flag fulfillment bottlenecks before Cassini demotes listings. This is revenue protection, not just compliance.
Metric: Seller performance standards compliance rateWe don’t run ads — we align them. Organic listings that rank for brand + model get Promoted Listings budget for category + use case terms. We also build off-eBay brand citations (PR, reviews) that lift Cassini’s seller authority signal. This is part of a broader ecommerce link building strategy that compounds across channels.
Metric: Organic + paid impression share and brand-search volume| Pillar | 500–2K SKUs | 2K–10K SKUs | 10K–50K SKUs | 50K–100K+ SKUs |
|---|---|---|---|---|
| Title Engineering | Manual + template | Programmatic templates | API-driven bulk | Custom tooling + ML keyword selection |
| Item Specifics | Manual audit + fill | Bulk template application | Auto-populate from PIM | AI-assisted + human QA |
| Conversion Velocity | Top 20% SKUs | Top 30% + category templates | Priority tier + programmatic | Full catalog + continuous testing |
| Seller Health | Monthly review | Weekly API monitoring | Daily API + alerts | Real-time dashboard + SLA |
| Authority Signals | Quarterly PR | Monthly PR + brand monitoring | Ongoing PR + review gen | Dedicated brand team |
A 500-SKU store and a 100,000-SKU store are different engagements, not the same engagement at a different price. We tier deliverables, team, and tools to the catalog — not the invoice.
At 500 SKUs we manually optimize every listing. At 100,000 we build programmatic templates, prioritize the top 20 percent of SKUs by revenue potential, and automate the rest via eBay Trading API and Browse API. The work scales with the catalog.
Week 1: Discovery call, platform mapping, catalog audit launch, senior strategist assigned.
Weeks 2–3: Full technical audit — crawl coverage, item specifics gaps, category errors, schema gaps, seller health — prioritized by revenue impact with implementation instructions.
Week 4: Commercial keyword map for top 20–50 categories, content audit, internal linking plan.
Weeks 5–6: Priority fixes live — title templates deployed, item specifics bulk-filled via File Exchange, category corrections applied, HTML description rollout, GTIN/MPN validation. Every listing receives an ecommerce product page SEO framework applied at scale.
Weeks 7–8: Conversion-velocity improvements — fitment tables, size charts, trust signals — Promoted Listings alignment review, Compliance Health Monitor activated.
Weeks 9–12: Organic GMV baseline vs. current, non-brand impression share, click share, conversion rate, incremental GMV vs. prior trajectory, AI visibility baseline (ChatGPT, Perplexity, Gemini citations). Month-9 incrementality check scheduled.
Every report starts from your GA4, not third-party estimates.
We separate revenue from people searching your name from revenue from people discovering you.
GA4 data-driven model credits organic even if conversion happens via email or direct later.
Holdout-style analysis against prior trajectory, category trends, competitor movement. If our work didn’t beat the counterfactual, we say so and recommend you stop spending.
Monthly brand mention rate and referral traffic from ChatGPT, Perplexity, Gemini against your top 50 commercial queries.
| Metric | Baseline | Current | Δ | Method |
|---|---|---|---|---|
| Organic GMV/mo | $86,000 | $247,000 | +187% | GA4 purchase event, session_source = ebay |
| Non-brand GMV/mo | $34,000 | $198,000 | +482% | GA4, branded query exclusion |
| Incremental GMV (vs. counterfactual) | — | $142,000 | — | Holdout: prior 12-mo trend + category index |
| Non-brand impression share | 12% | 38% | +217% | Seller Hub Search Terms Report |
| AI citation rate (top 50 queries) | 0% | 22% | — | Manual + API check (ChatGPT, Perplexity, Gemini) |
Data from a fashion apparel client on Shopify Plus + eBay, 8,400 SKUs, 11-month engagement.
What scales price: SKU count, number of marketplaces (eBay + Amazon + Walmart), managed vs. advisory scope, custom tooling or PIM integration, PR and brand citation volume.
You’re pre-launch with no sales history — use Promoted Listings first; we’ll tell you directly.
You need revenue movement in under 60 days — SEO compounds; paid search is faster.
You want guaranteed #1 rankings — Cassini doesn’t work that way; we guarantee work that beats the counterfactual or we tell you to stop.
Your budget is under $1,000/mo — at that level the work is tasks, not the technical and content system that moves catalog revenue.
Run an established eBay store doing $50K+/mo GMV; want organic measured in GMV, not impressions; have 500+ SKUs with item specifics gaps you know are costing you visibility; and want a named strategist who understands Cassini, not a generalist adapting Google tactics to eBay.
Frooition does templates. MarketLift does Shopify and eBay but publishes no alignment method. We build the map so every dollar compounds.
→ See our Amazon SEO services and Shopify SEO services for channel-specific methodologies.
Our monitor flagged 340 client SKUs at risk three weeks before enforcement. We bulk-updated via API in File Exchange — zero listings demoted. Competitors who reacted late lost two to four weeks of impressions.
eBay Developers Program member since 2018, Terapeak certified, 80+ eBay catalog optimizations across auto parts, fashion, electronics, industrial. Based in Westwego, LA. You get her direct Slack and email.
Continuity Guarantee: Your strategist stays for the engagement. If they leave Ecommerce SEO Lab, we replace them with a peer at our cost — no handoff to a junior.
$120K → $340K/mo organic GMV in 12 months. 22,000 SKUs. Fitment data and item specifics completion drove 482 percent non-brand impression share lift. Incrementality: holdout vs. prior 12-month trend + category index. For stores on this platform, our Magento SEO methodology applies the same Cassini-first framework.
$86K → $247K/mo in 11 months. 8,400 SKUs. Title engineering, category editorial, and Promoted Listings alignment. Incrementality: competitor benchmark + seasonality adjustment.
$45K → $180K/mo in 10 months. 12,000 SKUs. GTIN/MPN enrichment, compliance monitor, cross-channel keyword map. Incrementality: synthetic control (similar categories not optimized). Multi-marketplace sellers also benefit from our Walmart SEO services for full-channel coverage.
Starts at $2,500/month for stores doing $50K–$500K/mo GMV; price scales with SKU count, marketplace count, and managed vs. advisory scope — no 12-month lock-in. See our ecommerce SEO packages for full pricing across all channels.
Technical fixes ship in Month 1; non-brand impression lift typically appears Month 3; first measurable organic transaction lift Month 6 (Month 9 for competitive categories like fashion and supplements).
eBay’s Cassini ranks on title relevance, item specifics completeness, conversion velocity, and seller health; Amazon’s A9/A10 ranks on sales velocity, backend keywords, conversion rate, and Brand Registry signals — different levers, different deliverables. For a deeper comparison, read our eBay SEO guide and Amazon SEO guide.
Yes — Promoted Listings amplify visibility temporarily; SEO builds the organic asset that makes Promoted Listings profitable. We align both so ad spend scales profitably.
Yes — we tier deliverables: programmatic templates for bulk SKUs, manual optimization for top 20 percent revenue drivers, API-driven automation for 50K+ catalogs.
No — we run a cannibalization audit first, assign primary keyword ownership per channel, and build a shared keyword map so channels compound instead of compete.
Our Compliance Health Monitor tracks policy and algorithm changes in real time; we assess impact within 48 hours and deploy fixes before demotions stick. This is part of our broader ecommerce technical SEO guide framework applied across every marketplace.
No — Cassini doesn’t allow guarantees. We guarantee the work beats a counterfactual baseline (Month 9 incrementality check) or we recommend you stop paying.
eBay SEO works best when aligned with multi-channel search capture. Learn how we optimize other major market channels in our Amazon search optimization guide and our Etsy listing SEO tips.
Delivered in 5 business days by your named strategist. No account connect required. No obligation. Schedule your ecommerce SEO audit today.
Or call +1 (504) 555-0199. We respond within one business day.