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OSRM provides a distance matrix API https://github.com/Project-OSRM/osrm-backend/wiki/Server-api https://github.com/Project-OSRM/osrm-backend/wiki/Server-api ("

by sp8962 11y ago

OSRM provides a distance matrix API https://github.com/Project-OSRM/osrm-backend/wiki/Server-api https://github.com/Project-OSRM/osrm-backend/wiki/Server-api ("table"). All open source, if you don't want to run it yourself, you can turn to a commercial service provider, see switch2osm.org