I built ValorMercado.mx — a web SaaS tool currently live and used by professional appraisers in Mexico, with Netlify Identity auth, MercadoPago and Stripe payments, a credit system, and Claude AI integrated. Then I packaged the foundation into a starter kit.
The stack
Vanilla JavaScript + HTML/CSS — no framework bloat
Netlify Identity — auth without a backend
MercadoPago + Stripe — LATAM and international payments
PayPal — additional checkout option
Claude AI (Anthropic) — AI features via API
Credit system — users buy credits, spend credits
Why this stack?
Netlify Identity gives you auth with zero server cost. Combined with Netlify Functions for serverless backend logic, you can run a full SaaS with paying users and nearly zero operating cost. ValorMercado.mx runs this way in production today.
What's inside
Complete Netlify Identity auth flow with protected routes, MercadoPago and Stripe payment integration side by side, PayPal checkout option, a working credit system (buy credits, consume credits per action), Claude AI API integration ready to extend, and a clean project structure deployable to Netlify in minutes.
The part that took the most time
Getting three payment processors to coexist cleanly — each with their own webhook, their own success/failure callbacks, and all of them updating the same credit balance in the database. The starter kit has this logic already abstracted and working.
Who this is for
Devs who want to launch a SaaS fast without a heavy backend
Anyone integrating AI features with a credit/usage model
Developers targeting both LATAM (MercadoPago) and international (Stripe) users simultaneously
Get it
Live proof: ValorMercado.mx is running this stack with real paying users right now.
👉 Get the starter kit on Gumroad — $29 USD
Custom development available: buildlabig@gmail.com
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