Then we fund what it proves. Sandbox runs real go-to-market for operators, scores the demand, and deploys capital only into what's proven. Live today on our own paying clients.
We run cheap, fast market experiments on go-to-market ideas (landing pages, outbound, AI search, content) and deploy operators and capital only into the concepts the market has already paid for.
One thesis, proven three times: an established company with real results and a weak market presence. Same problem, same engine.
Sandbox runs the full GTM engine: website, AEO and SEO, content, distribution, reporting. UMS brings 25 years of named proof, including $800M+ saved for the City of New York across 80+ agencies.
Hospitality beachhead. A cost-recovery firm whose clients include Hyatt, Marriott, Hilton, Walmart and Capital One, and who is invisible in search. We make them findable.
NYC market entry on Local Law 97. A decade-old building-optimization product. We build and run the North American site, AI-search presence, and executive LinkedIn.
Engagements run $10K/mo, live in month one, compounding every month after. Every client doubles as live R&D for the product.
Why it matters: the engine is not a slide. It is generating revenue today, and every client program is a measured experiment feeding the dataset.
Validation arrives after commitment: after the build, after the hire, after the check. Everyone in the chain eats the cost.
Spends six months building before talking to a single customer, then learns there was no demand.
Still the GTM person themselves. Can't afford a $450K SDR-and-marketer pair, can't ramp one in six months.
The AI SDR is slop with a quota. The agency is templated work with a markup. Neither produces demand evidence.
Pre-seed is underwritten on narrative and founder charisma. Roughly 1 in 10 bets reaches meaningful revenue.
Accelerators select on founders, not measured demand. Agencies sell hours. GTM tools execute but don't decide. Venture studios bet their own ideas.
None of them produce quantitative demand evidence before the money goes in. The market's answer always arrives after the spend.
Test an idea against the real market for hundreds of dollars, not months of build. Advance only what converts. Fund only what's proven.
The engine drafts angles and ICP variants; landing pages, outbound, AI search and content gather real demand data.
Click-through, reply rates, bookings, price acceptance. Live scoring separates signal from noise.
Validated concepts get matched to operators and playbooks. Capital follows the proof, not the pitch.
Winners compound into a portfolio. Every experiment feeds the engine that runs the next one.
The system does 80% of the work. A real operator nails the last 20% that wins the client. Agentic-only isn't good enough: AI needs human taste and judgment, and the client wants a person who owns the outcome.
First to put validation, operator enablement, GTM intelligence and capital in one loop. Dogfooded daily on paying clients, so the product ships only after it has worked.
We own the whole stack, so all of a client's context lives in one place. One meeting transcript becomes a page, a LinkedIn post and a newsletter in minutes, not a hand-off across 20 tools that don't talk. Every run sharpens the system, and software going to zero only widens the gap.
What took an agency a quarter (landing pages, copy variants, outbound, ad tests) now takes hours. Testing every idea is rational for the first time.
Millions of skilled operators want to start something, and the same wave that gives them the tools is taking the jobs they would leave.
PE, search funds and corporates are sitting on capital they need to deploy on evidence, not narrative.
Product moats are eroding. Execution and distribution are the advantage now, which is exactly what Sandbox systematizes.
Why hasn't this been built? Until this AI generation, one credible market test cost too much to run thousands of them. The engine only became buildable in the last 24 months.
Established service and consultancy firms with marquee clients and almost no digital presence: the UMS and MX3 archetype, the lawyers and cost-saving consultants run by operators with no in-house marketing and no time to build it. The segment we already sell retainers to, and the ICP the closest funded competitor won't serve.
Search funds, PE and corporate venture buying validated deal flow. Founders at the top of the funnel on free and prosumer tiers.
Quantitative pre-seed underwriting. A market that doesn't exist yet, the way storefront-for-anyone e-commerce didn't exist before Shopify.
Before Shopify, selling online meant $20K of developers and months of setup, so only funded businesses did it. After, it was $29/mo and a few hours. Before Sandbox, validating a business takes $5 to 50K and marketing expertise. After, anyone starts in minutes, with a measured path to capital. YC selects on founders. Sandbox selects on measured demand. The math: $100M ARR is roughly 42K customers at a blended $200/mo (illustrative), under 1% of even a conservative operator TAM.
[illustrative] blended pricing and TAM penetration are model assumptions. See Financials for the proof milestones that replace them with data.
| Alternative | What they do | What they don't |
|---|---|---|
| Monaco ($85M+ from Founders Fund and Benchmark; Sam Blond, ex-Brex CRO) | AI revenue platform plus a forward-deployed AE for funded founders. $25K/yr, annual, upfront (GA pricing slated to roughly double). | No validation before capital. Won't serve agencies (their words: "can't think of a good agency demo"). No case studies, no SLA, no pilot. |
| YC & accelerators | Selection, network and capital at scale. | Select on founders and narrative, not measured demand. |
| Venture studios | Build companies from internal ideas. | Concentrated portfolio risk, no external validation engine, fund-economics drag. |
| Agencies & GTM tools | Execute campaigns, sell hours or seats. | Execute decisions they don't make, and keep none of the learning. |
Own the operator and agency ICP the funded-founder players won't touch.
Validation-gated capital with hit-rate data. Monaco's proof is social. Ours is evidentiary.
Cross-vertical GTM dataset no single-client agency or single-portfolio studio can match.
Software engineer turned founder. Built Presscart to 2,000+ clients, 5,600+ articles across 1,500+ publications. Builds Sandbox's validation engine and GTM AI, and owns the product, the systems and the experiment methodology.
Closer and operator. Runs revenue at Source Forward (commercial energy, NYC) and sales across Sandbox's client portfolio. Closed Sandbox's first retainers through warm intros and relationships. Owns the investor network.
One founder builds the engine, one proves the motion. Our first customers were ourselves: every Sandbox feature ships only after it has closed real revenue for a real client. We scale delivery through growth operators: each runs a book of client accounts on the system for base plus commission, with full ownership of the client's GTM. The system does 80%, they own the 20%. Our first operator starts this week, funded from retainer revenue and scaling with the raise.
Our bar before we scale: prove the engine can manufacture a $100M business at a known cost and hit rate. The funnel compounds, reach feeds the upsell, the upsell feeds the stakes.
| Revenue stream | Y1 | Y2 | Y3 | Y4 | Y5 |
|---|---|---|---|---|---|
| SaaS reach, ~$200/mo blended | $0.2M | $1.5M | $8M | $25M | $45M |
| Retainers upsell, $10K/mo | $1.2M | $4.8M | $12M | $20M | $30M |
| Marketplace ~15% of GMV | — | $0.5M | $3M | $10M | $20M |
| Capital pool equity + exit returns | — | — | $1M | $5M | $15M |
| Total revenue | $1.4M | $6.8M | $24M | $60M | $110M |
Use of funds (24 mo): team and the reach engine, a $3 to 5M experiment budget (2,000+ tests), a $6 to 10M capital-pool seed (60 to 80 deployments), and GTM.
Engine GA and first 25 SaaS customers (+2 qtrs); first 10 capital deployments (+4 qtrs); hit rate 2x the pre-seed baseline at N of 30+, which opens LP capital (+6 to 8 qtrs).
[illustrative] a driver-based planning model (client count, paid subs, GMV, hit rate), not a forecast. Today: 3 retainers live (UMS, MX3, Urbana), product in market, first growth operator onboarding.