The URLs of the synchronous and asynchronous fronts are:
| Service | Front | URL |
- Barcelona Association of Surveyors and Technical Architects and Building Engineers (CAATEEB)
- College of Telecommunications Engineers (COIT)
- College of Notaries of Catalonia / ANCERT (Notarial Certification Agency) - request for electronic copies
- Property Registry
- Commercial register
- Official Associations of Catalonia (DCOC)
- Official College of Architects of Catalonia
| Synchronous | https://serveis3.iop.aoc.cat/siri-proxy/services/Sincron |
| Asynchronous | https://serveis3.iop.aoc.cat/siri-proxy/services/Asincron |
| Asynchronous-response | https://serveis3.iop.aoc.cat/siri-proxy/services/AsincronResposta |