Free vs Paid Workplace & Productivity APIs for AI Agents you already pay for the suite — the question is the bridge.

The open-source servers in this category are free in the fullest sense — but they authenticate as you. Setting up Google Workspace or Outlook MCP means creating OAuth apps, managing consent screens, storing refresh tokens, and re-authenticating when tokens expire. calendarmcp takes a shortcut on macOS by driving Calendar.app through AppleScript; caldav-mcp speaks the open CalDAV protocol to any compliant calendar server, including self-hosted ones.

For a personal agent, this setup is a one-time evening of work. For a team deploying agents across an organization, OAuth plumbing becomes a genuine maintenance surface.

Be precise about the stack: the MCP server is free; the Google Workspace or Microsoft 365 subscription behind it is something you (or your employer) already pay; and the platform APIs come with quotas attached to your tenant. Specialized bridges follow the same shape — lexware fronts the Lexware Office API for invoices and vouchers, useful exactly to those with Lexware accounts.

True standouts on the open side exist: hebcal brings Hebrew calendar logic with no commercial upstream at all, and caldav-mcp plus a self-hosted calendar is a fully free stack end to end.

Two cases justify paying here. First, hosted convenience: an operator who runs the bridge, handles the OAuth dance, and exposes calendar or mail actions as a remote MCP endpoint your agents call without your team maintaining token infrastructure. Second, capability layers like Temporal Cortex Calendar MCP's deterministic scheduling tools — contact resolution, availability computation, booking — where the logic itself is the product.

x402 prices these as per-action calls: schedule a meeting, send a message, resolve availability — each settles in USDC on Base in about two seconds, from $0.01 per call, with the agent paying before the handler runs. Productivity actions are low-frequency and high-value, the easiest pattern to price per call.

If you're wiring an agent to your own accounts and can stomach OAuth setup, the free bridges are mature and complete — Google Workspace MCP Server alone curates 41 tools across the suite. If you're deploying many agents, or want scheduling intelligence beyond raw API access, a paid hosted endpoint trades cents per action for the maintenance you skip.

Loomal's Workplace & Productivity category lists all 32 live servers with descriptions and x402 pricing where maintainers have configured it, so bridges and hosted endpoints can be compared in one view.