Receipt-verified build packs
Build packs your coding agent executes.
Complete PRD, architecture, task graph, and acceptance tests — feed one to your own agent and it builds the complex, universal part of your product. Every listing carries a public execution receipt proving the build works before you spend anything.
01
Buy the pack
A complete PRD, architecture decisions, task graph, acceptance tests, scaffold, and prompts — every decision pre-made.
02
Feed it to your agent
Claude Code or Cursor builds inside the pinned scaffold, task by task, with no context beyond the pack.
03
Verify
Run the pack's own acceptance script and compare against the published receipt. The destination is proven, not promised.
Catalog
App Store Machinery
$129StoreKit 2 IAP with server-side JWS validation, fastlane + TestFlight pipeline, privacy manifest, and a review-rejection preflight — the complete shipping rig for an existing iOS app.
swiftui-storekit2-node · complex-universal · ~730,000 tokens (estimate)
3 of 3 runs passedTransactional Email Deliverability Core
$79Production transactional email machinery for a Next.js app: Resend integration behind a provider seam, local suppression list with correct bounce/complaint semantics, signature-verified webhooks, a domain warmup governor, staged DKIM/SPF/DMARC rollout with an automated DNS checker, and a template preview/test harness — with the tests already written.
nextjs-postgres-resend · complex-universal · ~370,000 tokens (estimate)
3 of 3 runs passedMarketplace Payouts & Connected Accounts
$199Two-sided marketplace money on Stripe Connect Accounts V2 — charge-type architecture, hosted onboarding/KYC, fulfillment holds and payout timing, refunds and disputes against connected accounts, negative balances, and the US 1099 reporting surface — as a receipt-backed build pack for your own coding agent.
nextjs-prisma-postgres · complex-universal · ~850,000 tokens (estimate)
Verification pendingProduct Feed & Merchant Center Compliance
$129A Google Shopping product feed that survives the reviewer: spec-valid RSS 2.0 output validated offline against the transcribed product data spec, a feed-to-landing-page price and availability consistency crawler, GS1-correct GTIN handling with honest identifier_exists semantics, on-page structured data generated from the same source as the feed, and a diagnostic that reports each named disapproval cause — including the one it cannot check.
nextjs-feed · complex-universal · ~430,000 tokens (estimate)
Verification pendingMulti-Tenant Auth & RBAC Core
$149Orgs, invites, roles, sessions, and Postgres-RLS tenant isolation — the auth spine of a B2B SaaS, with cross-tenant isolation proven by the verify suite.
nextjs-postgres · complex-universal · ~550,000 tokens (estimate)
3 of 3 runs passedOffline Sync Engine
$99Local-first app core — client store, sync protocol, per-field LWW conflict resolution, offline queue, and a schema-migration story that survives queued mutations — an agent-executable blueprint with a runnable convergence proof.
nextjs-dexie-postgres · complex-universal · ~510,000 tokens (estimate)
3 of 3 runs passedPlay Billing Machinery
$149Google Play subscriptions and one-time products done server-authoritatively — Billing Library 9 (which clears the August 2026 v8 mandate), RTDN-driven entitlements verified against the Play Developer API, the three-day acknowledgement window, and a Play Console review preflight.
android-kotlin-node · complex-universal · ~800,000 tokens (estimate)
Verification pendingSaaS Billing + Tax Core
$149Production Stripe Billing core for a seat-based SaaS — plans, seats, proration, dunning, idempotent webhooks, Stripe Tax, invoices, customer portal — as a receipt-backed build pack for your own coding agent.
nextjs-prisma-postgres · complex-universal · ~660,000 tokens (estimate)
3 of 3 runs passedScheduling & Availability Core
$99Recurrence, timezones, DST and double-booking done correctly inside your own product: RFC 5545 expansion in floating wall-clock time, IANA zone-identity handling with a pinned gap/overlap policy, buffers and multi-seat capacity, and a booking path that is safe under real concurrency — an agent-executable blueprint with a 39-check acceptance harness that runs property tests over real DST transitions across six zones and races 16 concurrent bookers against real PostgreSQL.
node-postgres · complex-universal · ~560,000 tokens (estimate)
Verification pendingWebhook Durability & Replay
$149The webhook ingestion pipeline every provider assumes you built and none of them ship — idempotency, ordering, dead-letter, backfill and provably exactly-once effects across Stripe, Shopify, Apple, Google Play and Resend — as a receipt-backed build pack for your own coding agent.
nextjs-postgres-worker · complex-universal · ~820,000 tokens (estimate)
Verification pending
How receipts work
Before a pack is listed, our verification harness executes it the same way you will — a fresh agent, a clean scaffold, the pinned model. The receipt is the machine-generated record of those runs, published in full.
- Pass rate, as M of N
- Our harness runs each pack from a clean scaffold N times on the pinned model and publishes exactly how many runs passed. Agent builds are stochastic — a pack that passes 4 of 5 is listed as 4 of 5, never as "always one-shots."
- Everything pinned
- The exact model id and exact dependency versions the runs used are locked into the receipt. What was verified is what you build with.
- Measured cost
- Token counts and wall time in the receipt are per-run means from real runs. The token figure on a catalog card is an estimate and is labeled as one.
- Tamper disclosure
- The receipt lists every scaffold file the building agent modified or deleted. An empty list means built pristine. Modifications are disclosed, not hidden.
- Pending means pending
- A pack without a completed verification run says "Verification pending" and publishes no numbers. We never invent them.