SellerKit (working name)
Idea status: Idea stage · Target: an MRR ladder ($1k → $50k) instead of one fixed number · Verdict: No as described. Go, small, as a KDP backlist pricing and promo extension for publishers with 20+ titles · Last updated: 30 Sept 2026
Start here → WHAT-TO-DO-AND-AVOID.md: odds at each MRR level (with conditions: $1k ~40–55%, $5k ~14–22%, $10k ~6–11%, $20k ~2–4%), 12 do's, 14 avoids, checkpoints and a kill switch.
Where this came from. This idea is row C8 of the 30 Sept 2026 micro-SaaS idea catalog ("Chrome extension for marketplace sellers"). It was not a feature list supplied by a founder, so there's no stated team, price or traction. See analysis/09.
Name. "SellerKit" is a working name. Once narrowed to KDP authors and publishers, it's also a poor fit: authors don't call themselves sellers. Check trademark, domain and Chrome Web Store listing names before using any name publicly. Don't use "Kindle", "KDP" or "Amazon" in the product name; Amazon's marks can only describe compatibility.
The idea in one line (as described): a subscription Chrome extension that adds bulk-edit, organisation or analytics features to a seller dashboard that the platform neglects: Amazon Merch, KDP, Etsy, eBay, Amazon Seller Central, Meesho or Flipkart.
The idea in one line (recommended): a Chrome extension that works inside the KDP Bookshelf to change prices and royalty options across many books at once, schedule price promotions that revert on their own, and check the backlist for pricing and metadata mistakes.
Research was run on 30 Sept 2026, with a confidence level on each claim. See research/10-verified-research.md.
Folder layout
sellerkit/
├── WHAT-TO-DO-AND-AVOID.md ← final analysis and decision (read first)
├── README.md ← this index
├── analysis/ ← the investor-style assessment
│ ├── 00-one-page-brief.md
│ ├── 01-verdict.md
│ ├── 02-market-reality-check.md
│ ├── 03-feature-scrutiny.md
│ ├── 04-expanded-feature-catalog.md
│ ├── 05-pre-mortem.md
│ ├── 06-fundability.md
│ ├── 07-gaps.md
│ └── 09-assumptions-and-open-inputs.md
├── plans/ ← execution plans
│ ├── 08-90-day-plan.md
│ └── 11-24-month-gated-roadmap.md
└── research/ ← cited evidence
└── 10-verified-research.md
File numbers match the other ideas in this portfolio, so cross-references like "doc 08" work the same way.
Documents
| # | Document | What it answers |
|---|---|---|
| — | WHAT-TO-DO-AND-AVOID.md | Final decision: MRR ladder with odds, customer math, 12 do's, 14 avoids, checkpoints |
| 00 | analysis/00-one-page-brief.md | The whole assessment on one page |
| 01 | analysis/01-verdict.md | MRR ladder for 5 versions of the idea and 2 time commitments, Tier A/B, fundable yes/no |
| 02 | analysis/02-market-reality-check.md | Six seller platforms scored on pain, native gap, terms risk, competition, price and reach; buyer segments; market size |
| 03 | analysis/03-feature-scrutiny.md | The stated elements of the idea, classified |
| 04 | analysis/04-expanded-feature-catalog.md | About 35 features KDP publishers ask for, classified and prioritised |
| 05 | analysis/05-pre-mortem.md | Top 3 causes of death, warning signs, fixable? |
| 06 | analysis/06-fundability.md | Invest?, the skeptic's questions, proof points, bootstrap vs raise |
| 07 | analysis/07-gaps.md | Gaps to pay, renew and refer, plus Chrome, Amazon terms and privacy |
| 08 | plans/08-90-day-plan.md | First 90 days, week by week |
| 09 | analysis/09-assumptions-and-open-inputs.md | Assumptions made, and the inputs that would change the verdict |
| 10 | research/10-verified-research.md | Cited research with confidence levels, and what's still unverified |
| 11 | plans/11-24-month-gated-roadmap.md | Month 0–24 phases, gates, revenue path, budget guardrails |
Caveat
Team, hours per week available, KDP experience and traction were never provided. The assumptions are in analysis/09. Three things are still unverified and could change the verdict (see research/10):
- that KDP has no native bulk price update (its help pages show per-title editing only, but one search summary claimed otherwise);
- whether Amazon's March 2026 Agent Policy applies, or will be extended, to KDP;
- how many KDP publishers have 20+ titles and pay for tools.
There is no verified base rate for paid Chrome extensions reaching a given MRR.