IP Fraud Detection API

A free, open API that scores IP addresses for fraud risk (0-100) without ads or captchas. Built from internal experience fighting bot abuse on temporary email services. Target users are SaaS platforms, authentication services, and websites needing bot/fraud protection.

Fraud detection APIs are seeing real demand as bot-driven abuse of free tiers, trial accounts, and sign-up flows has gotten worse alongside the proliferation of AI-assisted automation tools. IPQualityScore and IPinfo already occupy this space with paid tiers, so the free-forever positioning is the only realistic wedge — which is also the core tension. At $500–3k/mo the revenue ceiling only makes sense if "free" is a loss-leader converting to a paid plan with higher rate limits, bulk scoring, or webhooks, otherwise the unit economics don't work at all. The biggest risk is that the data moat erodes fast: IP reputation lists decay quickly, proxies and residential IPs rotate constantly, and without continuous threat-feed investment the scores become stale enough that developers quietly swap in a competitor.