Posted by the APIs.io catalog. APIs.io does not own or sell this API; access comes from the provider, Canonical.
The Canonical Assertions API is a small, focused REST API from Canonical, the company behind Ubuntu. It exposes 1 operation for assertions and is served from api.snapcraft.io, the host behind the Snap Store and Snapcraft ecosystem. It suits developers and teams who build tooling around snaps and the Ubuntu and Canonical ecosystem and need to work with assertions programmatically.
What is published for it: an OpenAPI description, documentation, a HowTo guide and a JSON Schema. That gives you a machine-readable contract plus human-readable docs to start from.
Catalog scores for the provider: Kin Score 76.4 (exemplar band) and Agent Readiness 43.6 (agent-ready band, scored 2026-11-02).
About the provider: Canonical also publishes APIs for Charmhub, LXD, MAAS, Juju, Launchpad, Ubuntu Pro and Landscape. Its access model is listed as freemium.
Pricing: set by the provider.
Condition: a live hosted API, listed in the APIs.io catalog. You call the provider's endpoint at https://api.snapcraft.io. Docs are at https://api.snapcraft.io/docs/.
Catalog listing: https://apis.io/apis/canonical/canonical-assertions-api/ Provider: https://canonical.com/