■ Stable
Virtual business address with API access — agents can receive, forward, and manage physical mail programmatically.
Stable provides a premium US business address with full API and webhook access for automation. Agents can receive notifications on incoming mail, trigger scan/forward/shred actions, and integrate with Slack and other tools. Includes registered agent service. Note: initial signup requires human identity verification per USPS regulations.
website: https://usestable.com
docs: https://usestable.com/docs
categories: Virtual Mailbox, Registered Agent
tags: virtual mailbox, business address, physical address, mail API, registered agent
endpoint: https://api.usestable.com
protocols: REST
auth: api-key
pricing: subscription
payment: USD
agent-native: no
human needed: yes (human in loop)
scope: north-america
status: approved
registered: 2026-03-10
verified: 2026-03-10