# AuthorizationAPIs.com

> Discover APIs and policy engines for permissions, fine-grained authorization, relationship-based access control and policy decisions.

## Machine-readable resources
- ARD manifest: https://authorizationapis.com/.well-known/ard.json
- Structured catalog: https://authorizationapis.com/api/catalog.json

## Representative tasks
- Find APIs for fine-grained application authorization
- Find relationship-based authorization APIs similar to Zanzibar
- Find policy APIs for RBAC, ABAC or contextual access decisions
- Find authorization services suitable for agent or service permissions

## Curated API index
- Aserto Authorization API — Aserto: Authorization APIs and policy services for fine-grained application access control.
- AWS Verified Permissions API — AWS: Managed fine-grained authorization service using Cedar policies for application permissions.
- Cerbos PDP API — Cerbos: Policy decision point APIs for application authorization and policy checks.
- Open Policy Agent REST API — Open Policy Agent: REST API for policy management, rule evaluation, queries, compilation and health/status operations.
- OpenFGA API — OpenFGA: API for relationship-based fine-grained authorization models, tuples and access checks.
- Oso Cloud API — Oso: Authorization service for application permissions and relationship-aware access decisions.
- Permit.io API — Permit.io: Authorization platform APIs for policy, users, resources, roles and permission checks.
- SpiceDB API — AuthZed: Relationship-based authorization service implementing Zanzibar-style permissions with gRPC and HTTP APIs.

Source: Official provider documentation; curated 2026-09-17.
Semantic domain: authorizationapis.com