Sign riders for lead capture

[Blake Haley]

I'm a realtor in Maryland and wanted to step up my game. I wanted to see if anyone could recommend a good company that does sign riders with text codes for lead capture? I've seen a few that you pay per listing and I have seen a few where you can pay per month for a certain number of listings. I usually represent more buyers than sellers and average around 4 listings a year so maybe just the pay per listing would be the best/cost effective? Any help would be greatly appreciated! Thank you!!