Best dietary restriction filter for indie hackers

There are roughly 40-60 food discovery and restaurant tools in the indie/startup space, but almost none prioritize dietary filtering as their primary value prop. Most existing solutions (AllergicMenu, Find Me Gluten Free, HappyCow) focus on specific diets rather than being agnostic—meaning they're vertical plays, not horizontal infrastructure. The common failure is treating dietary restrictions as a checkbox feature instead of the main axis for discovery and recommendation. The real gap is a lightweight, API-first dietary restriction filter that indie hackers can embed into their own food apps, marketplaces, or restaurant platforms without rebuilding the wheel. A new shipper should focus on: (1) making it dead simple to integrate via API or SDK, (2) supporting 15-20 major restriction types with accurate, crowdsourced data validation, (3) offering real-time restaurant menu parsing rather than static databases, and (4) pricing it for solo makers ($0-50/month floor, not enterprise SaaS pricing). The indie hacker market is underserved because existing solutions either target consumers directly (saturated) or cost $500+/month for enterprise restaurant groups (wrong customer). There's a sweet spot for a $15-40/month tool that lets a solo founder add world-class dietary filtering to their MVP in under an hour.