Test the market before you build the productRun a proof →
For founders & product teams

Prove there's a market before you build it.

Turn a concept into a working prototype, host it live on Runcept, and put it in front of real buyers. Watch who runs it, who pays, and what they say — real demand signal before you commit an engineering roadmap.

Run a proof →See a live example

No pitch deck. No landing-page mock. A thing people can actually run.

Prototype fast
Build the concept, no infra.
Hosted live
A real URL people can run.
Real buyers
Exposure on the marketplace.
Demand dashboard
Runs, revenue, requests.
The old way vs. a proof

Stop guessing from a waitlist. Get demand from a thing people run.

Landing page + waitlist
A signup form measures curiosity, not willingness to pay.
You build for months before anyone touches it.
Feedback is opinions, not behavior.
No artifact to show investors or teammates.
A Runcept proof
A paid run is a hard signal that someone values it.
You prototype in a day and learn in a week.
You measure real usage, drop-off, and repeat runs.
You end with a working thing — and the numbers to back it.
How a proof works

From idea to real demand in four steps

1

Shape the concept

Define the inputs and the one deliverable your concept promises. Describe it — no engineering roadmap needed.

2

Prototype it live

Build it on Runcept from a prompt, script, or endpoint — or wire it up on the canvas. It hosts and scales itself.

3

Put it in front of buyers

Publish it as a concept listing on the marketplace. Real people discover it, run it, and pay per run.

4

Read the signal

Track runs, paid conversions, and requests. Strong signal? Convert the proof into a full agent in one click.

// the signal

Demand you can measure, not vibes you hope for.

Every proof comes with a dashboard: who ran it, who paid, where they dropped off, and what they asked for next. Willingness to pay is the clearest signal there is — and a paid run is exactly that.

See the proof dashboard →
14-day proof · Lease Clause Explainer
Unique runners31
Paid conversion39%
Repeat runs18
Asked for an API4

Verdict: strong enough to build. Convert the proof into a full agent with one click.

Once the signal is there

The proof works. Now pick how you ship it.

Keep earning on the marketplace, or pull the exact concept into your own product with the CLI and API. Same hosted logic either way — no rebuild.

Sell on Runcept

Publish it permanently

Flip the proof into a full agent in one click. It keeps its listing, inputs, price, and demand history — and starts earning per run right away.

Earn per run with no rebuild or migration.
Keep the demand history as social proof on the listing.
Runcept handles hosting, scaling, and billing.
Publish & sell →
>_CLI & API

Drop it into your own app

Call the same hosted concept from your product. Install the CLI, grab an API key, and it's a single request — no infra to run.

$ npm i -g runcept
$ runcept run meeting-notetaker \
--input call.mp3
Read the API docs →

What makes a testable concept

The concepts that get a clean read are narrow enough to prototype in a day and valuable enough that someone will pay to run them.

Narrow

Prototypes in a day

One task, one deliverable. If it takes a month to prototype, it takes too long to get a read on demand.

Valuable

Someone will pay to run it

The concept saves real time or money. Willingness to pay — even a little — is the signal you are testing for.

Measurable

Has a clear success moment

You can tell when it worked: a file produced, a question answered. Clear outcomes make clean signal.

// proof faq

Questions founders ask

How is a proof different from Build & sell?
Build & sell is for a workflow you already know people want. A proof is for a concept you are not sure about yet — you prototype it, expose it to buyers, and let paid runs tell you whether the market is there before you invest in building the real thing.
Do I need to have built anything?
+
No. You can prototype the concept directly on Runcept — from a prompt, a script, an endpoint, or the visual canvas. If it takes defined inputs and returns a defined result, you can stand up a proof.
What signal do I actually get?
+
A dashboard of real behavior: unique runners, paid conversion, repeat runs, where people drop off, and follow-up requests (like asking for an API). Willingness to pay is the headline number.
What if the concept works?
+
Convert the proof into a full agent in one click — it keeps its listing, inputs, and price. If the signal is weak, you learned that in a week instead of a quarter.
Does it cost me to run a proof?
+
You publish the proof for free and set a per-run price for buyers. Runcept takes a platform fee on paid runs, the same as any agent. Failed runs are refunded and never charged a fee.

Put your concept in front of real buyers.

Prototype it on Runcept, run a proof, and let paid runs tell you whether to build. If the signal is strong, ship it as a full agent the same day.

Run a proof →Already validated? Build & sell