New startup ideas · Consumer and commerce · Consumer
startup idea
Listwire
One API that lists any secondhand item everywhere and prices it from real comps.
Small resellers and secondhand shops connect once to Listwire and their inventory appears, correctly categorised and priced, across every consumer resale marketplace, with orders, cancellations and payouts flowing back through the same endpoints.
- Infrastructure and APIs
- Small business
- $100B+ market
- Network effects, winner takes most
- US first
4/5
venture judge
6
similar startups, last 2 years (41 all-time)
94%
of 3 nearest real companies still alive
yes
6 matching federal grants and programs
Direction supported by government programs and grants
Test it before you build it
$1,100 · 3 weeks · 20 prospects
For $1,100 and 3 weeks, prove that sneaker resellers doing 200-2,000 listings a month will prepay $99, triple what Vendoo charges, because pricing from real sold comps is worth it.
Riskiest assumption · Resellers doing 200-2,000 listings a month will switch from Vendoo or List Perfectly and pay roughly triple their current bill because pricing built from real sold comps changes what they earn per shoe
1Focus group: who and where
A solo sneaker and streetwear reseller running 200 to 2,000 active listings across eBay, Depop and Grailed, currently repricing by eyeballing sold listings one shoe at a time and paying $30-70 a month for a cross-lister like Vendoo or List Perfectly
where to find 20 · r/Flipping and r/sneakermarket on Reddit (community); eBay advanced search filtered to sellers with 300+ active sneaker listings, messaged through eBay (list); the next Sneaker Con event, which runs in major US cities year round (event); Whatnot sneaker livestream sellers (channel)
2Sell first, build later
A founding account, one of 10: within 14 days of payment we put your next 200 listings live across eBay, Depop and Grailed, priced from real sold comps, with orders flowing back to one dashboard; the first month is concierge-run by us
the ask · $99 for the first month, founding rate locked at $99 per month for 12 months, then usage-based per listed item
a real yes · A real yes is $99 charged and marketplace credentials or an inventory export handed over; a real no is 'looks great', a free trial request, or anyone who will not connect at least one live venue
3Small experiments
The first one attacks the riskiest assumption; each ends with a number that says whether to run the next.
1. Sold-comp report to paid conversion
$150 · 10 days
Pick 15 resellers from eBay search and r/Flipping, hand-build each a repricing report on 20 of their live listings using real eBay sold data and Terapeak, showing where they are over or under market. Deliver it free, then ask for the $99 prepaid founding month on a call. One founder builds reports, the other runs calls.
keep going if · 4 of 15 report recipients pay the $99 founding month on the call
2. Sneaker Con floor interviews
$450 · 2 days
Work the seller tables at the nearest Sneaker Con with a printed sample report and the founding offer. Ask 25 sellers what they pay for cross-listing today, whether sold-comp pricing would change what they charge, and close for the $99 prepay on the spot with a payment link.
keep going if · 12 of 25 sellers say they misprice weekly and at least 2 pay the $99 founding month at the table
3. Priced landing page
$500 · 14 days
Publish a one-page site with the founding offer and checkout, drive traffic with the free report as the hook via posts in r/Flipping and $400 of Reddit ads. Count visitors, report requests and paid conversions.
keep going if · 5% of visitors request the report and 2 more resellers pay $99
4Collect a deposit up front
Tesla took $1,000 refundable reservations for the Model 3 and $100 for the Cybertruck before building either: the deposit is the measurement, not the revenue.
$99
per prospect, refundable
how · First month prepaid at checkout or by payment link on the call, the standard instrument for a small business buying software; the reseller gets a receipt naming their founding slot and their 14-day go-live date set up: Stripe Payment Links ↗
what it reserves · One of 10 founding accounts, the $99 rate locked for 12 months, and their three venues integrated first
refund · Refunded in full if their 200 listings are not live across the promised venues within 14 days of payment
target · 6 prepaid founding months from 20 conversations within 21 days
Go: build it if
6 or more resellers prepay $99 and hand over credentials, and at least half say the sold-comp pricing, not the cross-listing, is why: build the API
Kill: stop if
1 or fewer payments from 20 conversations, or every prospect says Vendoo at $30 is good enough: the pricing data is not worth a 3x price, stop
5 Scripts to run itoutreach message, landing copy, deposit terms · click to open
outreach message
You are running a few hundred sneaker listings across eBay and Depop and repricing them by scrolling sold comps one shoe at a time. I will build you a free repricing report on 20 of your live listings using real sold data, showing exactly which ones are leaving money on the table. If it is useful, I am taking 10 founding accounts at $99 a month, everything listed everywhere and priced automatically. Got 20 minutes this week to go through your report?
landing page
List once, sell on every sneaker marketplace at sold-comp prices $99 founding month: your next 200 listings live on eBay, Depop and Grailed within 14 days, priced from real sold data Get your free repricing report and claim 1 of 10 founding accounts
deposit terms
You pay $99 today for your founding month, which reserves 1 of 10 founding accounts and locks the $99 monthly rate for 12 months. If your 200 listings are not live across eBay, Depop and Grailed within 14 days of payment, the full $99 is refunded, no questions.
Would you run this test?
One tap. The yes-share feeds the Demand pillar of this idea's score; nobody sees who answered.
Budgets are out-of-pocket estimates for a team of one to three, US market. Size the deposit to the deal, and check the terms before taking money in a regulated line.
Scorecard
One score that balances how trendy the idea is, the demand for it and its potential for 100x, with competition measured relative to every other idea in the catalog. Recent startup trends first, government priorities second.
63
Idea Score, 0-100 · raw 38.9 x 1.61
Active
competition: more crowded than 56% of ideas · headwind x0.72
+2.0
government priorities, secondary (6 matching grants)
Trend
30
Is the wave forming now? 2025-26 entrants vs 2023-24, rounds since 2025, the sector's live-batch direction, the 2026 trend analyst.
- Entrants 2025-26 vs 2023-24 (similar companies)56
- Rounds announced 2025+ in the sector38
- Sector direction (live batch)0
- 2026 trend analyst25
Demand
70
Does anyone want it? YC's current RFS, companies already paid for something similar, the operator judge, founders' yes-rate in decks, readers who would run the test.
- YC asks for it (current RFS: idea / sector)60
- Someone already pays (similar companies, recent / all-time)100
- Operator judge: real pain50
100x potential
64
Can it return a fund? The venture judge (double weight), market-size and moat axes, neighbours still alive, the technologist judge.
- Venture judge75
- Market size axis100
- Moat axis100
- Neighbours still alive12
- Technologist judge25
Score = 100 x cbrt(Trend x Demand x 100x) x (1 - 0.5 x crowding) + government bonus (max 5), calibrated so the 95th-percentile idea scores 90 (order never changes). A geometric mean: a weak pillar cannot be papered over. Percentiles are among the 272 ideas in the catalog; the terms matched were lists, secondhand, item, everywhere, prices, resellers, shops, connect.
The idea in full
- What
- Small resellers and secondhand shops connect once to Listwire and their inventory appears, correctly categorised and priced, across every consumer resale marketplace, with orders, cancellations and payouts flowing back through the same endpoints. Pricing comes from the actual sold-price stream running through the API, not from scraped asking prices, so the recommendation gets sharper with every transaction routed. Self-serve signup, usage-based pricing per listed item and per completed sale, with a catalog operations team normalising the messy long tail behind the scenes.
- Why now
- The cluster shows the demand side without the plumbing: SellRaze (yc F25) sells speed of listing, Miniswap (yc F25) sells a hobby marketplace and Maison Safqa Holdings Limited runs luxury flash sales, while 81% of tracked sites in this cluster are still alive, meaning the marketplace count keeps growing and nobody is aggregating the connections.
- Wedge: first customer and entry point
- Sneaker and streetwear resellers doing 200 to 2,000 listings a month across three venues: one integration and a pricing endpoint is enough to win them.
- Path to 100x
- Secondhand and resale commerce is a $100B+ GMV market and the sold-price stream is a data asset that only the router can assemble, so better pricing pulls more sellers and more sellers make pricing better in a loop competitors cannot cold-start. At $10B of routed GMV and about 1.5% captured across listing and transaction fees that is roughly $150M of revenue on infrastructure margins.
- Ceiling
- If the platform stays stuck at hobbyist sellers, average revenue per account never covers the catalog operations cost and the loop never reaches escape velocity.
- Closest real companies, as the generator saw them
- SellRaze is a consumer-facing selling app and Miniswap and Maison Safqa Holdings Limited are marketplaces competing for the same supply. Listwire never owns the buyer or the listing surface, it sells the pipes, so marketplaces integrate it instead of fighting it.
- Main risk
- The two or three largest marketplaces restrict or price their APIs to stop an aggregator sitting between them and their sellers.
Five judges
Each judge scores every idea in the catalog with a named rubric; the venture judge decides whether a card is shown at all (4-5 is venture-grade).
Venture investor
4/5
Sold-price stream nobody else can assemble across $100B+ resale GMV is a real data flywheel, discounted by marketplace API hostility.
Bootstrapper
3/5
Sneaker resellers doing 2,000 listings a month pay today, but a catalog operations team for the long tail is a real payroll before scale.
Operator
3/5
Cross-listing is a real daily chore, but sneaker resellers doing 200 listings a month are a thin-wallet buyer and marketplaces control the APIs.
Technologist
2/5
The card names its own killer: the two or three largest marketplaces can price or close the APIs the entire router depends on.
Risk
1/5
The entire product is a router across marketplace APIs the two or three largest owners can restrict at will, exactly the platform dependence this lens rejects.
trends
2/5
Multichannel resale listing tools predate 2023; the card never connects its pipes to agent-driven shopping, the one relevant 2026 shift.
Similar startups in the directory
Companies whose pitch matches most of the idea's terms (lists, secondhand, item, everywhere, prices, resellers, shops, connect): 41 all-time, 6 from the last two years. Same matching as Idea Check.
Operator of WhatTime, a global B2B luxury watch re-commerce platform designed to deliver instant liquidity at competitive prices. Unlike traditional resale channels—where peer-to-peer transactions are slow and dealer buybacks undervalue assets—WhatTime combines speed with high-value outcomes. The platform sources pre-owned watches from domestic sellers through a real-time appraisal and pricing engine, then connects listings to a vetted global buyer network spanning Japan, Germany, Hong Kong, and China, with more than 20 secondary resellers across four countries. By doing so, WhatTime enables sellers to capture 90–105% of typical C2C listing prices with a transaction success rate above 70%, while completing the entire resale process in as little as one hour.
Marketplace to get stuff from overseas
Operator of an online marketplace intended to help people to rent short term retail space. The company's marketplace connects retailers, brands and designers with their customers through short-term retail stores, also known as pop-up shops, as well as helps realtors and space owners to list their property on the site and name their price and approve all bookings, enabling clients to benefit from each other and grow in terms of revenue.
Ambassadors for top-quality Japanese products, connecting Japanese boutiques and artisans with international consumers through an exceptional shopping experience
DOUZO is a global OMIYAGE Platform which makes new travel, cross-border commerce and international logistics.
The fastest way to sell online.
The Marketplace for Complex Hobbies
AI Driven EPC - Weld Fabrication Contractor
Misprint is building Robinhood for Pokemon cards
The Heart of Foodservice Equipment Procurement | Backhouse
Expedia for ordering blank apparel
The generator's reference companies
Real companies the model named as closest when it wrote the card, with their fate. A check mark is a company the radar could verify in its directory.
Public money in this direction
US federal grants, SBIR/STTR awards and open opportunities from the radar's public-money feed, matched to the idea's terms; the sector totals give the context.
6
grants and programs matching the idea
33
startup-relevant grants in Consumer
$10M
awarded in the sector, tracked
1
opportunities open now in the sector
- Collaborative Research: III: Graph-based Vector Databases, from Theory to Practiceawardhigh relevance
National Science Foundation · Info Integration & Informatics · $200K · posted 2026-07-13
- Collaborative Research: III: Graph-based Vector Databases, from Theory to Practiceawardhigh relevance
National Science Foundation · Info Integration & Informatics · $200K · posted 2026-07-13
- Collaborative Research: III: Graph-based Vector Databases, from Theory to Practiceawardhigh relevance
National Science Foundation · Info Integration & Informatics · $400K · posted 2026-07-13
- Collaborative Research: Activity-Based Modeling and Optimization for Urban Curb Managementawardmedium relevance
National Science Foundation · ISP-Infrastructre Systms & Ppl · $325K · posted 2026-08-04
- Collaborative Research: Activity-Based Modeling and Optimization for Urban Curb Managementawardmedium relevance
National Science Foundation · ISP-Infrastructre Systms & Ppl · $325K · posted 2026-08-04
- Collaborative Research: III: Graph-based Vector Databases, from Theory to Practiceawardmedium relevance
National Science Foundation · Info Integration & Informatics · $200K · posted 2026-07-13
Market signal
What the radar sees in Consumer: new companies by cohort year, the forming YC batch, and outcomes since the February snapshot.
Consumer · 182 → 222 → 211 → 156 → 64 new companies 2022 → 2026 · 86% aliveYC F26 live: 4 in this cluster, 3% of the batch (was 3% in S26)Since February, of 782 YC companies here: 6 acquired, 4 shut down, 45 rewrote their pitch
Design attributes
The card is one cell of a designed set: every axis below was chosen before the text was written, and the text had to realize it.
- Buyer
- Small business
- Business model
- Infrastructure and APIs
- Path to 100x
- Network effects, winner takes most
- Market size
- $100B+ market
- Capital intensity
- Capital-medium (ops, field teams)
- Speed to revenue
- Revenue in 1-3 years
- Technical depth
- Integrations, no-code
- Go-to-market
- Self-serve
- Moat
- Data moat
- Geography
- US first
- Regulation
- Unregulated
- Vibe
- Boring business
Listed under
An idea sits in its own sector and in any sector its text clearly touches.
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