Exchange Stats API

Read-only reporting on the same API domain as Search and XML.

• Get exchange statistics: GET /exchanges/stats.
• Daily totals, daily app/source (sid) breakdowns, and daily domain breakdowns.
• Requires a scoped Nexus member key and an explicit assignment of the requested exchange.
• OpenAPI specification.

Resource assignments are verified for the authenticated tenant and member on every request. Missing or invalid assignments deny access.