Marketplace entry runs a spectrum from open registration to invitation-only, and new sellers routinely aim at the wrong end, courting gated channels while the open doors sit unworked. The open platforms are not unguarded, though: they replace the entry gate with performance gates, limits, holds, and metrics that vet you AFTER you start. Knowing where each platform puts its gate is the practical map.
The genuinely open doors
eBay: register and list today. No application, no catalog review, the openest major marketplace there is. The gates come after: new-seller limits around ten items to start, payout holds while you build history (the payouts timeline), and defect metrics that decide whether the account grows or stalls.
Etsy: open for qualifying goods. Anyone can open a shop (a one-time setup fee applies); the gate is what you sell, handmade, vintage, and craft supplies under its policies, enforced after the fact. The performance layer: processing-time promises, the experience score in search, and case history.
Amazon: open account, gated shelves. Registration is open (identity verification is real but procedural); the nuance is category and brand gating, much of the catalog is ungated, while specific categories, brands, and conditions need approval with invoices behind them. New accounts also meet FBA capacity limits and account-level holds (the account-hold mechanics).
Your own store: no gate at all. Shopify, WooCommerce, or OpenCart, nobody approves you, and nobody sends traffic either: the gate relocates to marketing spend, the store-versus-marketplace trade in its purest form.
The gated end, for calibration
Walmart Marketplace runs application-based approval favoring track records; Target Plus is invitation-only (via platforms like Zentail and StoreAutomator where it appears at all); many niche and EU verticals vet catalogs before entry. None of this is where a new seller starts, gated channels read your history on the open ones, which makes the open doors the application form.
Playing the open doors well
The strategy the spectrum implies: start where entry is free, and treat the first months as record-building, because that record IS the currency the whole ecosystem trades on.
- Pick one or two open channels that fit the catalog, the channel-fit math, rather than everything at once.
- Run the early limits as an allocation exercise: proven movers, honest stock, tracking on everything, the small-limit playbook.
- Keep the record clean mechanically, not heroically: synced quantities so no channel promises what another just sold, honest handling times, fast case responses. The performance gates all read the same underlying facts.
- Add channels on evidence: velocity and margin per channel decide the next door, the mix data, and by then your record opens gated ones.
Common questions
Which single marketplace is easiest to actually start on?
eBay: no entry gate, no catalog restriction beyond policy, buyers arrive without marketing. The limits are small but they grow on performance.
Are the no-approval marketplaces lower quality?
No, they are the highest-traffic consumer marketplaces in the West. Open entry reflects their moderation model (police behavior, not applications), not their buyer quality.
Do I need a registered business to start?
Generally no for individual selling; thresholds and tax rules arrive with volume, the business-account transition and tax basics cover when formality becomes mandatory.
What about Facebook, TikTok, and local channels?
Social commerce entry varies by region and program, and local channels (classifieds, regional marketplaces) are mostly open. They make fine experiments; the inventory behind them still needs one truth.
Open doors, clean record, one truth
Start on the open marketplaces with stock that never lies, the record that opens every gated door later, from $49/month with unlimited orders. See pricing.