Firstbase.io

Firstbase offers Firstbase One, a suite of tools to launch, operate, and grow a startup. It includes Mailroom (premium US address and virtual mailbox), Agent (registered agent and annual reports), Accounting (full-service accrual bookkeeping), and Tax Filing (state and federal returns for LLCs, C‑Corps, and international founders). It automates formation of LLCs or C‑Corps with ongoing compliance support and 24/7 global customer service. The platform positions itself as an all-in-one back office, with add-ons such as banking, equity management with Carta, and legal-credit perks from partner firms.