The best crime API is the Crime Data API, which provides data on crime depending on the location's longitudes and latitudes, and is free to use with unlimited requests. The UK Police Open Data API is also highly rated, providing information on policing and crime for Northern Ireland, England, and Wales, and is free to use with unlimited requests. The Crime Score API offers a security rating and crime score information, and is free for use if the calls do not exceed 500 per month. YourMapper2 API provides local, civic, and open data nationwide, and is free for API calls less than 100. JailBase API provides access to a database of information on arrests and mug-shot data from different regions in the US, and is free to use with unlimited requests. Walk Score API provides walk, bike, and transit score information, and is free with unlimited requests. World Cities API allows users to obtain a list of specific cities depending on the search criteria, and is available for free if the requests do not exceed 300. NFLArrest API provides access to information on NFL players' arrest records from a large database, and is free for use with unlimited requests. CrimeoMeter API provides accurate data on crimes instantly, and has a free basic plan for API calls that do not exceed 10.