New startup ideas · AI for people who run the AI themselves · What vibe coders need after the demo
startup concept
Tillhouse
Payments, sales tax and refunds as one drop-in for non-developer founders
Tillhouse is a payments layer purpose-built for vibe-coded apps: a snippet the builder pastes via a prompt that handles Stripe checkout, US sales tax registration thresholds, subscription lifecycle, dunning and refunds, with a dashboard written for someone who has never seen a webhook.
- Infrastructure and APIs
- Small business
- A Cloud for Small Software
2
similar startups, last 2 years (9 all-time)
no
no public money matching the concept's terms
Test it before you build it
$700 · 4 weeks · 25 prospects
For $700 and 4 weeks, prove that builders about to charge their first customer will reserve a paid checkout-and-tax setup for $49 and accept a 1% usage fee, before a line of Tillhouse exists.
Riskiest assumption · A non-technical builder about to take their first payment will hand checkout, refunds and sales tax to a third-party layer and later pay 1% of volume, rather than paste Stripe's own free Payment Link and ignore tax until forced.
1Focus group: who and where
A non-technical founder whose Lovable app just gained a pricing page or a 'buy' button - visible on their live site this month - who has never handled a refund, a failed card or a sales tax registration threshold and is about to take their first real payment.
where to find 25 · The Lovable Launched showcase filtered for apps showing pricing pages or checkout buttons (a directory that reveals exactly who is about to charge), the No Code Founders Slack community and r/nocode (communities where non-technical builders ask payment-setup questions), and Product Hunt 'coming soon' pages plus the Indie Hackers product feed (channels where launching builders announce paid plans).
2Sell first, build later
A launch package sold before the product exists: working checkout, refund handling, failed-card recovery and US sales tax threshold tracking live on the buyer's app within 7 days of reserving, set up inside their own Stripe account.
the ask · $49 refundable reservation now; the service is free until the app passes $1,000 processed, then 1% of processed volume on top of Stripe's own fees
a real yes · A real yes is a $49 card charge plus, at pilot stage, signed founding terms accepting the 1% fee. Waitlist emails, 'this would be great', and builders who want the setup but refuse the fee terms do not count.
3Small experiments
The first one attacks the riskiest assumption; each ends with a number that says whether to run the next.
1. First-payment outreach and reservation pitch
$150 · 12 days
Find 25 Lovable-built apps with fresh pricing pages via Lovable Launched and Product Hunt, and DM each maker the outreach script naming something specific about their pricing page. Book 12 calls; on each call list the three things that will bite them (refunds, dunning, state sales tax thresholds) and ask for the $49 refundable reservation on the spot.
keep going if · 12 of 25 reply, 10 become calls, and 5 of 12 calls end with a $49 reservation charged
2. Reserved-slot landing page
$250 · 10 days
Publish the landing copy with a card-charging reservation - a waitlist that takes money, not emails - and post it where payment-setup questions already appear in r/nocode and No Code Founders, plus in every DM follow-up. Count visitors against reservations.
keep going if · 4 or more $49 reservations from roughly 150 visitors, counted separately from call-driven reservations
3. Manual setup and fee acceptance
$300 · 14 days
For the first 3 reservers, build the promised setup by hand inside their own Stripe account within 7 days: checkout, refund flow, dunning emails and a threshold-tracking spreadsheet for the states where they sell. Then present written founding terms - free until $1,000 processed, 1% of volume after - and ask them to sign before their first live charge.
keep going if · 2 of 3 pilot apps take a live payment and sign the 1% founding terms
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.
$49
per prospect, refundable
how · A refundable card reservation on the landing page - a waitlist that takes money - chosen because the card's own wedge is 'no budget decision and no sales conversation', so the test must show this buyer will still move money when asked; the founder sends the link on the call and confirms the charge before booking setup.
what it reserves · One of 15 launch slots, hands-on setup within 7 days of the app being ready, and 0% Tillhouse fee on the first $10,000 processed
refund · Refunded in full any time before setup begins, or automatically if setup is not delivered within 7 days of the agreed start.
target · 8 reservations from 25 conversations within 28 days
before taking money · Do not hold, route or touch customer funds and do not register anyone for sales tax during the test - run every pilot inside the buyer's own Stripe account as configuration and advice until counsel has reviewed money transmission and marketplace facilitator exposure.
Go: build it if
8 of 25 contacted builders reserve at $49 and 2 of the first 3 pilots go live and sign the 1% founding terms within 28 days - build the drop-in.
Kill: stop if
Fewer than 4 reservations from 25 conversations, or pilot builders replace the setup with a plain Stripe Payment Link once they see the fee terms - the Stripe-absorbs-it risk is confirmed, stop.
5 Scripts to run itoutreach message, landing copy, deposit terms · click to open
outreach message
Noticed the new pricing page on your app - congrats on getting to the point of charging real customers. Most Lovable builders hit a wall right here: refunds, failed cards, and US sales tax thresholds nobody warned them about. I set all of it up inside your own Stripe account within 7 days so your first $1,000 collects cleanly, free until you pass $1,000 processed. A $49 refundable reservation holds one of 15 launch slots. Got 20 minutes this week?
landing page
Take your first payment without learning what a webhook is $49 refundable reservation: checkout, refunds and sales tax tracking live on your app in 7 days, free until $1,000 processed. Reserve your launch slot - 15 available, refunded if we miss the 7-day setup.
deposit terms
You pay $49 today to reserve one of 15 launch slots and 0% fees on your first $10,000 processed. Setup goes live inside your own Stripe account within 7 days of your app being ready. Full refund any time before setup begins, and automatic refund if we miss the 7-day window.
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
Ranked against every idea in the catalog: trend, demand and 100x potential from the corpus, competition relative to the other ideas. A generated concept has no judges or swipes yet, so its pillars use the data signals only.
44
Idea Score, 0-100 · raw 27.3 x 1.61
Warm
competition: more crowded than 44% of ideas · headwind x0.78
+0.0
government priorities, secondary (0 matching grants)
Trend
17
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)2
- Rounds announced 2025+ in the sector0
- Sector direction (live batch)50
Demand
53
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)30
- Someone already pays (similar companies, recent / all-time)75
100x potential
47
Can it return a fund? The venture judge (double weight), market-size and moat axes, neighbours still alive, the technologist judge.
- Neighbours still alive47
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 382 ideas in the catalog; the terms matched were payments, sales, tax, refunds, drop-in, non-developer, founders, purpose-built.
The concept in full
- What
- Tillhouse is a payments layer purpose-built for vibe-coded apps: a snippet the builder pastes via a prompt that handles Stripe checkout, US sales tax registration thresholds, subscription lifecycle, dunning and refunds, with a dashboard written for someone who has never seen a webhook. First hour: connect Stripe, paste the generated integration prompt into Lovable, and take a live test payment end to end.
- Grounded in (2025-2026 signals)
- YC Fall 2026 RFS 'A Cloud for Small Software'; Lovable at about $500 million ARR by June 2026 with 80% non-technical builders; Menlo Ventures (published June 26, 2025) found only 3% of Americans pay for consumer AI, so builders monetizing their apps need conversion-grade payment flows, not duct tape; MCP with '97 million monthly SDK downloads and 10,000 active servers' after its December 9, 2025 donation makes the integration installable from the builder's own assistant.
- What it rides
- A Cloud for Small Software: YC's Fall 2026 RFS is a call for the operational services small software lacks, and payments plus US tax compliance is the piece that carries legal consequences when a non-developer improvises it.
- Why now
- The first large cohort of non-technical builders is crossing from free demos to charging customers: Lovable added roughly $300 million of ARR between November 2025 and June 2026, and every paid app behind that growth needs US sales tax handling its owner cannot code.
- Wedge: first customer and entry point
- Lovable builders about to charge their first customer; free until the app's first $1,000 processed, then a usage fee, so sign-up requires no budget decision and no sales conversation.
- Closest real companies, as the generator saw them
- None tracked; the briefs show no 2025-2026 cohort company doing payments or tax for non-developer builders, and the crowded-phrases list shows the field clustering in insurance and voice agents instead.
- Main risk
- Stripe extends its own no-code tooling downmarket and absorbs the layer before Tillhouse reaches distribution.
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Public money in this direction
US federal grants and open opportunities matched to the concept's terms.
No matching grants or programs tracked; 19 startup-relevant grants exist in Horizontal AI assistants overall.
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