Cruxfinder: free ecommerce seller intelligence, $15K a month, self-reported

Cruxfinder provides ecommerce sellers with a free newsletter, tools, analysis, and seller deals. Its $15K a month was founder-reported on the Indie Hackers product page (not independently verified), as of September 30, 2026.

What it actually sells

Cruxfinder is a free intelligence brief for people who sell online for a living. It covers major marketplaces, policy changes, and AI tool launches in a weekly read.

The free resources include browser-based calculators and analyzers for Amazon, Shopify, and TikTok Shop sellers, a searchable newsletter archive, a blog, a software directory, and seller tools. The site also lists benchmarks for GPT, Claude, Gemini, and open models across listing copy, ads, ops, and support.

How it charges

The newsletter, back issues, blog, software directory, and free seller tools are free. Crux Pass is a free perk for subscribers that bundles negotiated deals, extended trials, and credits on PPC, repricing, accounting, freight, AI listing, and review tools.

Where customers come from

The site lists Amazon, Shopify, TikTok Shop, and Walmart sellers, including brand owners and ecommerce specialists. Its stated audience also includes agency operators, PPC and listing specialists, aggregators, and software teams selling into the ecommerce market.

Cruxfinder says it has 201K subscribers and reaches 201K active sellers every week. It publishes a weekly newsletter, a searchable archive, and a daily blog, while sponsorships run across the newsletter, blog, and Crux Pass.

What stands out

Cruxfinder combines marketplace news, policy coverage, AI tool launches, seller calculators, software comparisons, model benchmarks, and subscriber deals in one free resource. The site reports 201K subscribers, a 35%-40% average open rate, and 200+ sources monitored weekly.

From the official site

Around 201K subscribers: Amazon and multichannel brand owners, agency operators, PPC and listing specialists, aggregators, and software teams selling into the ecommerce market.

Every Monday, we break down the most important marketplace news, policy changes, and AI tool launches into a fast, actionable read.

Crux Pass is a free perk for subscribers. It bundles negotiated deals, extended trials, and credits on the PPC, repricing, accounting, freight, AI listing, and review tools that sellers already pay for.

Excerpts from the official website, fetched October 1, 2026.

Where it sits in the data

Cruxfinder's $15K a month is higher than 71% of the 6,604 projects with founder-reported monthly revenue in our dataset; the median across them is $2K. Snapshot: 2026-09-30. The dataset only covers founders who chose to publish their numbers, so it leans toward businesses that work; use it for scale, not as an average.

Currency

All figures are in US dollars as published. A rough yuan or euro conversion is not applied here because prices, taxes and acquisition costs differ by country.

Could you build something like this?

My view is that this needs real work because the buyer is specific: ecommerce sellers and the specialists who serve them. The demand signal is a free weekly publication, a searchable archive, daily analysis, no-sign-up tools, and a directory covering marketplace, advertising, operations, and support tasks.

Distribution would need to come from consistent niche content, search, marketplace communities, and relationships with software companies. The hard parts are editorial judgment, keeping marketplace and AI coverage current, maintaining useful tools, handling sponsor relationships, and managing the support load that comes from a broad resource set. Competition would matter in newsletters, directories, seller tools, and software deals.

Verdict: Needs real work.

One thing to take from it

Cruxfinder pairs a free weekly ecommerce brief with free tools, comparisons, benchmarks, archive access, blog coverage, and Crux Pass. The page reports 201K subscribers, a 35%-40% average open rate, and 200+ sources monitored weekly.

Sources

Cruxfinder official website, fetched October 1, 2026
Cruxfinder about page, fetched October 1, 2026
Indie Hackers product page: revenue founder-reported on the Indie Hackers product page (not independently verified), as of September 30, 2026

Revenue, team and start-cost figures are what the founder reported at the interview date, not current figures and not a prediction of what you will earn. Product and pricing facts come from the business's own website as checked on 30 September 2026. Method & sources · Disclosure