SheetAPI - Turn Any Google Sheet Into a Live REST API in 60 Seconds

Non-technical founders are using Google Sheets as their database but cannot expose that data to their Webflow or Framer site without a developer. SheetAPI turns any Sheet into a typed, paginated REST API endpoint with one click, no code, no backend. The April 2026 no-code wave is screaming for this.

𝕏 Post Reddit HN

Difficulty

intermediate

What is it?

Thousands of indie hackers on Reddit r/nocode and ProductHunt are running their entire business on Google Sheets but hit a wall the moment they need to display that data on a live site or feed it to a Zapier workflow. SheetAPI authenticates with Google OAuth, reads the user's selected sheet, infers column types, and generates a stable REST endpoint at api.sheetapi.dev/YOUR-ID that returns clean JSON with filtering, sorting, and pagination. Each endpoint auto-updates as the Sheet changes. The v1 is intentionally minimal — no writes, no webhooks, no complex transforms — just read-only JSON from a Sheet in 60 seconds. Buildable entirely with Google Sheets API v4, Supabase for endpoint metadata, and Vercel Edge Functions for the live proxy. Sheety and Sheetson exist but both have terrible DX, no type inference, and no free tier worth using.

Why now?

Google Sheets API v4 is stable, Vercel Edge Functions make sub-100ms proxying trivial, and the April 2026 no-code explosion means 10,000 new Webflow and Framer projects per week are desperately looking for dynamic data without a backend.

▸One-click Google OAuth Sheet picker that generates a stable JSON endpoint instantly (Implementation: Google Sheets API v4 + Vercel Edge proxy).
▸Auto column type inference showing string, number, date, boolean tags in the dashboard.
▸Request rate dashboard showing daily usage vs. tier limit with upgrade prompt at 80%.
▸Shareable endpoint docs page with example curl command auto-generated for each endpoint.

Target Audience

No-code founders, Webflow and Framer devs, and indie hackers using Google Sheets as a lightweight CMS — estimated 2M active users in no-code communities

Example Use Case

Jake, a Webflow developer, connects his client's product catalog Sheet, gets a JSON endpoint in 60 seconds, drops it into a CMS Collection via fetch, and ships the project without touching a backend.

User Stories

▸As a no-code founder, I want to turn my Google Sheet product catalog into a JSON endpoint, so that my Webflow site can display live inventory without a developer.
▸As a Framer designer, I want auto-detected column types in my API response, so that I can filter and sort data correctly in my frontend.
▸As a power user, I want to see my daily request count vs. my plan limit, so that I know when to upgrade before hitting the cap.

Done When

✓Sheet connection: done when user completes Google OAuth, selects a Sheet, and sees a generated endpoint URL on the dashboard within 30 seconds
✓JSON proxy: done when user fetches the endpoint URL in a browser and receives correctly typed JSON rows matching the Sheet contents
✓Usage meter: done when dashboard shows real request count and a red upgrade banner appears when user reaches 80% of daily limit
✓Stripe billing: done when user clicks Upgrade, completes checkout, and endpoint limit immediately increases from 1 to 10 without page refresh.

Is it worth building?

$9/month x 300 users = $2,700 MRR at month 3. $29/month pro tier x 100 power users = $2,900 MRR. Total ~$5,600 MRR at month 4 — assumes 3% conversion from ProductHunt traffic of 10,000 visitors.

Unit Economics

CAC: $5 via organic Reddit and ProductHunt. LTV: $108 (12 months at $9/month). Payback: 1 month. Gross margin: 92%.

Business Model

SaaS subscription

Monetization Path

Free tier: 1 endpoint, 500 req/day. Paid $9/month: 10 endpoints, 10k req/day. Pro $29/month: unlimited endpoints, priority cache.

Revenue Timeline

First dollar: week 2 via beta upgrade. $1k MRR: month 2. $5k MRR: month 5. $10k MRR: month 10.

Estimated Monthly Cost

Vercel Pro: $20, Supabase: $25, Google API: $0 (under quota), Stripe fees: ~$25. Total: ~$70/month at launch.

Profit Potential

Solid lifestyle business at $5k-$10k MRR. Acquisition target for no-code platform consolidators.

Scalability

High — add write endpoints, webhooks on cell change, and white-label plans for agencies.

Success Metrics

Week 1: 200 signups from ProductHunt. Week 3: 30 paid. Month 2: 120 paid, under 10% monthly churn.

Launch & Validation Plan

Post in r/nocode and Webflow community asking how people expose Sheet data to live sites. Collect 50 email signups from a Typef orm before building.

Customer Acquisition Strategy

First customer: post in r/nocode with 'I built a free tool that turns your Google Sheet into an API in 60 seconds' — link to live demo with a pre-seeded public Sheet. Ongoing: SEO targeting 'google sheets as api', ProductHunt, Webflow community forums, YouTube no-code tutorial creators.

What's the competition?

Competition Level

Medium

What's the roadmap?

Feature Roadmap

V1 (launch): Google Sheet to JSON endpoint, type inference, usage meter, Stripe billing. V2 (month 2-3): Filtering and sorting query params, webhook on Sheet change, CSV export. V3 (month 4+): Write endpoints, multi-sheet join, agency white-label plans.

Milestone Plan

Phase 1 (Week 1-2): Edge proxy + Google OAuth + type inference ships and verified with real Sheet. Phase 2 (Week 3-4): Stripe billing + usage logging + dashboard live, 10 beta users with real endpoints. Phase 3 (Month 2): ProductHunt launch, 100 paid users, filtering query params added.

How do you build it?

Tech Stack

Next.js, Google Sheets API v4, Supabase, Vercel Edge Functions, Stripe — build with Cursor for API proxy logic, v0 for dashboard UI

Suggested Frameworks

Google APIs Node.js Client, Drizzle ORM, Vercel Edge Runtime

Time to Ship

2 weeks

Required Skills

Google OAuth, Google Sheets API v4, Vercel Edge Functions, Stripe billing.

Resources

Google Sheets API v4 docs, Vercel Edge Functions docs, Stripe Billing quickstart, Supabase Auth guide.

MVP Scope

app/page.tsx (landing + demo), app/dashboard/page.tsx (endpoint list + usage), app/api/sheets/connect/route.ts (Google OAuth handler), app/api/sheets/endpoint/[id]/route.ts (Vercel Edge JSON proxy), app/api/billing/route.ts (Stripe checkout), lib/db/schema.ts (endpoints, users, usage_logs), components/EndpointCard.tsx (endpoint display + copy button), components/UsageBar.tsx (daily request meter), seed.ts (demo endpoint with mock data), .env.example (Google, Supabase, Stripe keys)

Core User Journey

Architecture Pattern

User selects Sheet via Google OAuth -> endpoint metadata stored in Supabase -> Vercel Edge Function proxies live Sheet read on each request -> JSON returned with type-coerced columns -> usage logged to Supabase.

Data Model

User has many Endpoints. Endpoint has one SheetConfig (sheet_id, range, column_types). Endpoint has many UsageLogs (timestamp, response_time, status).

Integration Points

Google Sheets API v4 for Sheet reads, Supabase for endpoint metadata and auth, Vercel Edge Functions for live proxy, Stripe for subscription billing.

V1 Scope Boundaries

V1 excludes: write endpoints, webhook triggers on Sheet changes, formula evaluation, multi-sheet joins, mobile app.

Success Definition

A Webflow developer finds SheetAPI on ProductHunt, creates an endpoint from their own Sheet in under 2 minutes, fetches it in their Webflow CMS, and upgrades to paid within 7 days without any founder contact.

Challenges

Google OAuth app verification takes 1-2 weeks for production — submit day one or launch is blocked. Distribution is the hard problem: Sheety has SEO dominance so cold ProductHunt launch alone will not win — need direct community seeding in r/nocode and Webflow forums.

Avoid These Pitfalls

Do not cache Sheet data too aggressively — users expect near-real-time updates and stale data kills trust. Do not skip Google OAuth verification submission on day one or you cannot go to production. Finding first 10 paying customers takes longer than building — budget 3x more time for community posting than coding.

Security Requirements

Supabase Auth with Google OAuth, RLS on endpoints table, refresh tokens encrypted at rest, rate limiting 100 req/min per IP on Edge Function, no Sheet content stored in database.

Infrastructure Plan

Vercel Pro for Next.js and Edge Functions, Supabase for Postgres and auth, Sentry for error tracking, GitHub Actions for CI, dev/staging/prod via Vercel environments. Total: ~$70/month.

Performance Targets

Expected 300 DAU at launch, 30,000 req/day across all endpoints. Edge Function response under 200ms. Dashboard load under 1.5s. Sheet data not cached longer than 60 seconds per endpoint.

Go-Live Checklist

☐Security audit complete
☐Payment flow tested end-to-end
☐Sentry live
☐Vercel Analytics configured
☐Custom domain with SSL active
☐Privacy policy published
☐5 beta users signed off on DX
☐Rollback plan: Vercel instant rollback
☐Google OAuth test users list configured during verification review
☐ProductHunt launch post drafted.

First Run Experience

On first run: a pre-seeded demo endpoint pointing to a public Google Sheet with 50 sample product rows is visible on the dashboard. User can immediately fetch the demo JSON URL in their browser without connecting their own Sheet. No manual config required: demo endpoint works without Google OAuth until user wants to connect their own Sheet.

How to build it, step by step

1. Define Drizzle schema for users, endpoints, and usage_logs in lib/db/schema.ts. 2. Run npx create-next-app and install Google APIs client, Drizzle, Stripe SDK. 3. Build Google OAuth flow in app/api/sheets/connect/route.ts storing refresh token in Supabase. 4. Build Vercel Edge proxy in app/api/sheets/endpoint/[id]/route.ts that fetches Sheet rows and returns typed JSON. 5. Write column type inference utility that detects string, number, date, boolean from first 10 rows. 6. Build EndpointCard.tsx showing URL, column types, and one-click curl copy. 7. Add UsageBar.tsx component reading daily usage from Supabase and showing upgrade prompt at 80%. 8. Wire Stripe checkout for $9/month and $29/month plans with webhook updating user tier. 9. Submit Google OAuth app for verification immediately and use test users list during review. 10. Verify: connect a real Google Sheet, copy the endpoint URL, fetch it in a browser, confirm typed JSON returns, complete Stripe checkout, confirm tier upgrade unlocks additional endpoints.

Generated

April 21, 2026

Model

claude-sonnet-4-6

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Disclaimer: Ideas on this site are AI-generated and may contain inaccuracies. Revenue estimates, market demand figures, and financial projections are illustrative assumptions only — not financial advice. Do your own research before making any business or investment decisions. Technology availability, pricing, and market conditions change rapidly; always verify details independently.