DriftWatch — Early alerts when API customers silently break

Warn solo API sellers before customers discover their subscription stopped working.

Problem

A solo developer selling a flight and hotel data API had a paying customer subscribe, hammer the API fine on night one, go quiet for five days, and then come back to nearly every call returning 422. The seller's own dashboard still showed the customer as active, and he only learned about the two-week breakage when the customer complained.

Solution

A monitoring assistant for small API sellers that connects to existing logs or gateways, models returning-customer patterns, and alerts when a customer comes back but keeps hitting errors, a key endpoint's 4xx/5xx rate jumps, or latency spikes. Alerts land in email, Telegram or Slack with sample failing requests and likely causes.

Users

Indie developers and small teams running paid APIs, SaaS endpoints or webhook services.

MVP

Two ingestion paths: upload structured log files, or point an HTTP forwarder at a log endpoint; three built-in rules for returning-customer failures, error-rate spikes and latency spikes; email and Telegram alerts; a setup flow that takes under 30 seconds.

Revenue

SaaS subscription at $9–19/month tiered by number of APIs, with a free tier covering one API and email alerts.

Why now

Indie developers now run entire API businesses alone but still rely on generic uptime monitoring that only answers 'is the server up'. Customer-level health signals are wide open, and the product is mostly log parsing plus a few rules.