There's lots of producers out there however they're not all on the very same level. Some are making a full time living making rap beats, some are just beginning and others are someplace in the middle. The ones that are simply starting out or are rather in the middle are most likely distributing a few of their beats totally free. They will likely want to keep their tag "taping stating their producer name or brand" in the beat or at the minimum they might require you to either mention them in the song or provide credit for producing the beat wherever you upload the tune on the internet.
Beat Makers Blog
A great place to begin discovering totally free rap beats is simply search YouTube, Google and Soundcloud for "Free Rap Beats" or "Free Hip Hop Instrumentals". Start making you a list of all the producers you like that are offering free beats and visit them typically to see exactly what's new and show them love and support. If you launch anything utilizing their beats make sure you let them understand and share your music link with them. You never understand if you do a really good task they may wish to begin working with you solely!
Free Beats | Free Rap Beats | Free Instrumentals