{
  "name": "US Census Intelligence API",
  "version": "v1.1.6",
  "provider": "PropTechUSA.ai",
  "auth_contract": {
    "version": "strict_auth_v1",
    "internal_keys": "exact_INTERNAL_KEY_match_only",
    "direct_keys": "census_direct_key_v1_primary; propdata_key_legacy_compatible",
    "rapidapi": "X-RapidAPI-Proxy-Secret_required",
    "failure_mode": "fail_closed"
  },
  "note": "Free tier — no key required for basic ZIP demographics + income.",
  "endpoints": {
    "zip": "GET /v1/census?zip=45406",
    "state": "GET /v1/census/state?state=OH",
    "county": "GET /v1/census/county?state=OH&county=Montgomery [BASIC+]",
    "compare": "GET /v1/census/compare?zips=45406,90210,10001 [PRO+]",
    "usage": "GET /v1/census/usage",
    "health": "GET /v1/census/health"
  },
  "pricing": {
    "free": "FREE/500",
    "basic": "$4.99/mo",
    "pro": "$9.99/mo",
    "ultra": "$19.99/mo"
  }
}