OpenCollection Format
OpenCollection is the open, YAML-based collection format Bruno now recommends for new collections as an alternative representation to .bru. Like .bru it stores requests, folders, auth, and scripts as version-friendly text. A file/interchange format modeled as a capability area - not a hosted API surface.
Not an API. Bruno publishes no API for this. It is a product area, listed for completeness, and it is not counted in the provider's API total.