The URLs for the synchronous and asynchronous frontends are:
| Service | Front | URL |
- Tax Agency (AEAT)
- General Directorate of the Cadastre
- General Directorate of Police (DGP)
- National Institute of Statistics (INE)
- National Employment Institute (INEM)
- Ministry of Education, Culture and Sports (ME) – Consultation of official qualifications
- General Treasury of Social Security (TGSS)
- Directorate General of Traffic (DGT) – consultation of Electronic Accreditation of Municipal Vehicle Tax (ATMV)
- Directorate General of Traffic (DGT) – consultation of information associated with vehicles and people of the ATEX service (Electronic Access for External Users)
- Directorate General of Traffic (DGT) – vehicle consultation
| Synchronous | https://serveis3.iop.aoc.cat/siri-proxy/services/Sincron |
| Asynchronous | https://serveis3.iop.aoc.cat/siri-proxy/services/Asyncron |
| Asynchronous-response | https://serveis3.iop.aoc.cat/siri-proxy/services/AsyncronResposta |