CardSurvive — Subscription Payment Rescue

Helps SaaS users and indie devs see which subscriptions will fail after a card update

Problem

Users discover some subscriptions survive a card replacement while others silently fail, with no clue whether it's the merchant token, bank block, or region rule. Indie developers get Stripe 'card declined' webhooks without knowing if it's expiry, risk control, or geography. Both sides guess in a black box, losing renewals and trust.

Solution

A lightweight diagnostic tool: users enter the declined merchant and card BIN range, and the system combines public BIN rules, common bank block patterns, and community reports to suggest a likely cause and next-step script. For developers, a webhook parser translates decline codes into plain language and generates retention email templates.

Users

Subscription users who repeatedly hit failed charges; indie hackers and early-stage SaaS founders

MVP

Card BIN parsing and bank-block pattern database; decline-code translator; retention email templates; community voting on which merchants support card-updater auto-sync; browser extension that pops diagnostics on failed payment pages

Revenue

Free for individuals, paid API or monthly subscription for developers; affiliate recommendations for alternative payment gateways like Paddle or Lemon Squeezy

Why now

Payment failure rates are under scrutiny during inflation, yet tools are built for large merchants. Lightweight diagnostics for individuals and indies are missing, and Stripe APIs make decline-code parsing feasible.