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StartupBuilderby Startups.Studio
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The startup-builder framework and platform, where a Startup is files compiled by five Builders into a business with an API, SDK, CLI and MCP server.

StartupBuilder builds a business as code. A startup.ts and a few folders compile into a running Startup, with an API, SDK, CLI and MCP server for every Verb.

Three ways in

You haveStart with
Nothing yetGetting started: npm create startups to a deployed Startup that takes a test payment
A Startup built on startups.newIts repository. Repositories mirrors it to GitHub; clone the mirror and run npx startup-builder dev
A Startup and a keyCall it from your own code: API, SDK, CLI or MCP
A coding agentBuild with a coding agent

One file, one business

startup.ts
import { Startup } from 'startup-builder'

export default Startup({
  name: 'Leaseline',
  domain: 'leaseline.app',
  extends: 'solo-saas',
  idea: 'Small property managers pay to never miss a lease renewal.',
  offers: {
    pro: {
      price: { amount: 29, currency: 'USD' },
      interval: 'month',
      terms: 'Every renewal noticed at 60 days.',
    },
  },
})

Each line is read by one Builder, and everything the file leaves out comes from the Startup Template:

LineBuilderCompiles to
extends: 'solo-saas'StartupBuilderTeams, a role agent in every seat, Processes and Workflows, Settings
domainSiteBuilderA Site at leaseline.app with pricing, terms and sign-in
offers.proSalesBuilderAn Offer and its Price, the Stripe objects behind them, checkout, a billing portal
Every inherited NounSoftwareBuilderapi.sb/leaseline.app, typed $, CLI operations, MCP tools, an App

Builders as compilers shows the six steps of one compile.

One call, every Interface

Every Interface reaches the same api.sb route: Order.place is one operation, with one input and one result.

One call, from any Interface to the Workflows it wakes: Order.placePOST /{namespace}/orders/place, $.Order.place, do Order.place and do · Order.place all reach https://api.sb/{namespace}. Order.place records one Action and emits Order.placed, which also goes to webhooks and starts Deliver an outcome.APIPOST /orders/placeSDK$.Order.placeCLIdo Order.placeMCPdo · Order.placeThe one APIapi.sb/{namespace}one name, one JSON inputVerbOrder.placerecords one ActionEventOrder.placedalso sent to webhooksWorkflowDeliver an outcomeOperations TeamOne call, from any Interface to the Workflows it wakes: Order.placePOST /{namespace}/orders/place, $.Order.place, do Order.place and do · Order.place all reach https://api.sb/{namespace}. Order.place records one Action and emits Order.placed, which also goes to webhooks and starts Deliver an outcome.APIPOST /orders/placeSDK$.Order.placeCLIdo Order.placeMCPdo · Order.placeThe one APIapi.sb/{namespace}one name, one JSON inputVerbOrder.placerecords one ActionEventOrder.placedalso sent to webhooksWorkflowDeliver an outcomeOperations Team
One call, four Interfaces, one path: the client reaches the API, the Verb records an Action, its Event goes out, and every Workflow whose Trigger names that Event starts.
Read as text
  • Clients: POST /{namespace}/orders/place, $.Order.place, do Order.place, do · Order.place.
  • API: https://api.sb/{namespace}.
  • Verb: Order.place, which records one Action.
  • Event: Order.placed, also sent to webhooks.
  • Workflow: Deliver an outcome (Operations Team).

The tab

PartHolds
FrameworkThe project structure, startup.ts, every file convention, the Builders and routing
PlatformDatabase, auth, storage, functions and realtime, and Stripe underneath every charge
InterfacesAPI, SDK, CLI, MCP, UI components
ShipShip my changes, the CLI in CI, verification
For agentsdocs for agents, /llms.txt, /asks.json, the agent files

Guides

What a founder says to their agent, and the guide that does it.

You sayGuideCallsStatus
Ship my changesShip my changesChange.review, Change.merge, Version.deploylive

Getting started

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