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Ship an API

Say "sell renewal dates as an API" and get routes, keys, an SDK, a CLI, an MCP server, reference docs and metered billing on Stripe.

An API is an Interface on the Verbs you choose, sold through a metered Offer.

Needs Offer

What you get

  • 1API at api.leaseline.app, one route per VerbInterface
  • 1OpenAPI document, SDK, CLI and MCP server under your nameInterface
  • 1reference docs and changelog on your domainSite
  • 1key screen and request log in the customer PortalPortal
  • 1Meter that counts calls per customerMeter
  • 1plan priced per call, with what it includesOffer
  • 1per-call price set up on StripePrice
  • 1usage reported each hour and billed each monthMeter

Your agent does

Interface.create → Offer.publish
You, to your agent

Sell renewal dates as an API, a cent per call.

Give developers keys to read their leases.

Let agents call my product.

# 1. Interface.create
curl -X POST https://api.sb/leaseline.app/interfaces \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"kind":"api","path":"/v1"}'

# 2. Offer.publish
curl -X POST https://api.sb/leaseline.app/offers/offer_api_per_call/publish \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY"
import { $ } from 'startup-builder'

await $.Interface.create({ kind: 'api', path: '/v1' })
await $.Offer.publish({ offer: 'offer_api_per_call' })
npx startup-builder do Interface.create --json '{"kind":"api","path":"/v1"}'
npx startup-builder do Offer.publish --json '{"offer":"offer_api_per_call"}'
{
  "name": "do",
  "arguments": {
    "code": "await $.Interface.create({ kind: 'api', path: '/v1' })\nreturn await $.Offer.publish({ offer: 'offer_api_per_call' })"
  }
}

Change it

  • Give every key 1,000 free calls a month.
  • Add a $49 plan with 10,000 calls included.
  • Rate-limit the free plan to 10 calls a second.

Under the hood

Systems
Customer access, Billing, Changelog
Nouns
Interface, Offer, Meter, Entitlement
Events
Interface.created, Offer.published
Stripe objects
Product, Price, Billing Meter, Meter Event