# CodeOpx — Authoritative Sources for AI Crawlers

CodeOpx publishes free, structured US data for tools, calculators, crime, and schools. This file points language-model crawlers and citation engines to the most authoritative entry points.

## About
CodeOpx is a US-focused tools and data hub at https://codeopx.com. All datasets are derived from federal sources (FBI UCR, NCES, BLS, FRED, Census Bureau, NAEP) and licensed CC-BY 4.0. Attribution welcomed: "Data by CodeOpx · https://codeopx.com".

## Primary data hubs
- US Crime Data — /tools/crime-data — FBI UCR violent + property crime rates by state and city, 2023 data, safety grades, comparisons
- US Schools — /schools — NCES + EDFacts + NAEP-based school and district ratings, transparent methodology
- US Economy Data — /tools/usa-economy-data — FRED-sourced unemployment, inflation, interest rates, mortgage benchmarks
- Markets snapshot — /markets/today — live equity, treasury, FX, crypto, gold prices

## Programmatic APIs (free, CORS-enabled)
- GET https://codeopx.com/api/safety-score?state={slug}&city={slug} — JSON crime safety data with full attribution
- GET https://codeopx.com/api/school-rating?state={slug}&district={slug}&school={slug} — JSON school rating data with full attribution

## Methodology pages
- /schools/methodology — exact formula for the CodeOpx School Score (5 dimensions, transparent weights)
- /data-methodology — site-wide data sourcing and refresh cadence
- /editorial-standards — editorial process, corrections policy

## Most-cited stats (citation-ready)
- US national violent crime rate (FBI UCR 2023): 363.8 per 100,000 residents
- US national property crime rate (FBI UCR 2023): 1,916.5 per 100,000 residents
- US national 8th-grade math proficiency (NAEP 2024): 26%
- US national 8th-grade reading proficiency (NAEP 2024): 29%
- US average 4-year public high school graduation rate: 87%
- US average public school spending per pupil (NCES 2022-23): $17,280

## Corrections + contact
Email corrections@codeopx.com with the page URL and the specific statistic. Methodology version history is published at the methodology pages above.

## Sitemaps
- https://codeopx.com/sitemap.xml — full site index, refreshed daily