Topaz

Topaz is an open-source (Apache-2.0) authorizer for fine-grained, policy-based, real-time access control for applications and APIs, maintained by Aserto (github.com/aserto-dev/topaz). It combines the Open Policy Agent (OPA) decision engine with a built-in Zanzibar-style relationship directory, so you can express authorization as policy-as-code and model RBAC, ReBAC, and ABAC over an object graph of users, groups, resources, and relations. Topaz is self-hosted - you run the authorizer yourself (Docker or binary) and it exposes gRPC plus REST (gRPC-gateway) APIs from your own instance. The Authorizer API answers decisions (is, decisiontree, query); the Directory API reads and writes objects, relations, and permission checks; and a local web Console ships alongside. Aserto is the commercial hosted control plane built on Topaz for centrally managing policies, data, and decision logs across many deployed authorizers.

Topaz publishes 5 APIs on the APIs.io network, including Authorizer API, Directory Checks API, Directory Objects API, and 2 more. Tagged areas include Access Control, Authorization, Fine-Grained Authorization, Open-Source, and RBAC.

Topaz’s developer surface includes documentation and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub
28.5/100 thin ▬ flat Agent 21/100 agent aware Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0
AccessFreemium
5 APIs
Access ControlAuthorizationFine-Grained AuthorizationOpen-SourceRBACReBACZanzibarOPAPolicy as Code

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0
Composite quality — 28.5/100 · thin
Contract Quality 11.8 / 21
Developer Ergonomics 1.6 / 17
Access Clarity 4.9 / 17
Operational Transparency 3.8 / 11
Contract Governance 0.0 / 10
Discoverability 5.5 / 9
Regulatory Posture 0.0 / 15
Agent readiness — 21/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Regulatory Posture applies to this provider. Its tags matched the Insurance regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/topaz: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

Topaz Authorizer API

Policy-driven decisions - is, decisiontree, and query - evaluated by the OPA engine.

Topaz Directory Checks API

Graph-based check and graph-expansion queries over the directory.

Topaz Directory Objects API

Objects in the Zanzibar-style directory - users, groups, resources, and other entities.

Topaz Directory Relations API

Relations (tuples) connecting subjects to objects in the directory graph.

Topaz Policies API

OPA policy modules loaded into the authorizer.

Open Collections 7

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Topaz and Directory Authorizer API

OPEN COLLECTION

Topaz and Directory Authorizer Directory Checks API

OPEN COLLECTION

Topaz and Directory Authorizer Directory Objects API

OPEN COLLECTION

Topaz and Directory Authorizer Directory Relations API

OPEN COLLECTION

Topaz and Directory Authorizer Policies API

OPEN COLLECTION

Topaz Authorizer and Directory API

OPEN COLLECTION

Scroll for all 7

Pricing Plans 1

Published pricing tiers and plan structures.

Topaz Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Topaz Rate Limits

3 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Topaz Finops

FINOPS

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Topaz Agentic Access

15 operations · 8 acting

15 operations · 8 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 SourceCode
SourceCode

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

License
License
 Plans
Plans
 FinOps
FinOps

Company 2

The organization behind the API

LinkedIn
LinkedIn
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: topaz
url: https://raw.githubusercontent.com/api-evangelist/topaz/refs/heads/main/apis.yml
name: Topaz
kind: organization
description: Topaz is an open-source (Apache-2.0) authorizer for fine-grained, policy-based, real-time access control for
  applications and APIs, maintained by Aserto (github.com/aserto-dev/topaz). It combines the Open Policy Agent (OPA) decision
  engine with a built-in Zanzibar-style relationship directory, so you can express authorization as policy-as-code and model
  RBAC, ReBAC, and ABAC over an object graph of users, groups, resources, and relations. Topaz is self-hosted - you run the
  authorizer yourself (Docker or binary) and it exposes gRPC plus REST (gRPC-gateway) APIs from your own instance. The Authorizer
  API answers decisions (is, decisiontree, query); the Directory API reads and writes objects, relations, and permission checks;
  and a local web Console ships alongside. Aserto is the commercial hosted control plane built on Topaz for centrally managing
  policies, data, and decision logs across many deployed authorizers.
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/topaz.png
tags:
- Access Control
- Authorization
- Fine-Grained Authorization
- Open-Source
- RBAC
- ReBAC
- Zanzibar
- OPA
- Policy as Code
tags_raw:
- Access Control
- Authorization
- Fine-Grained Authorization
- Open Source
- RBAC
- ReBAC
- Zanzibar
- OPA
- Policy as Code
created: '2026-07-11'
modified: '2026-07-11'
specificationVersion: '0.23'
apis:
- aid: topaz:topaz-authorizer-api
  name: Topaz Authorizer API
  description: Policy-driven decisions - is, decisiontree, and query - evaluated by the OPA engine.
  humanURL: https://www.topaz.sh/docs/authorizer-guide/overview
  baseURL: https://localhost:8383
  tags:
  - Authorizer
  properties:
  - type: OpenAPI
    url: openapi/topaz-authorizer-api-openapi.yml
  - type: Documentation
    url: https://www.topaz.sh/docs/authorizer-guide/overview
  - type: APIReference
    url: https://www.topaz.sh/docs/authorizer-guide/is
  - type: PostmanCollection
    url: collections/topaz.postman_collection.json
  - type: OpenCollection
    url: collections/topaz.opencollection.json
  - type: Documentation
    url: https://www.topaz.sh/docs/directory
  - type: APIReference
    url: https://www.topaz.sh/docs/directory/writer
  - type: APIReference
    url: https://www.topaz.sh/docs/directory/apis
- aid: topaz:topaz-directory-checks-api
  name: Topaz Directory Checks API
  description: Graph-based check and graph-expansion queries over the directory.
  humanURL: https://www.topaz.sh/docs/authorizer-guide/overview
  baseURL: https://localhost:8383
  tags:
  - Directory Checks
  properties:
  - type: OpenAPI
    url: openapi/topaz-directory-checks-api-openapi.yml
  - type: Documentation
    url: https://www.topaz.sh/docs/authorizer-guide/overview
  - type: APIReference
    url: https://www.topaz.sh/docs/authorizer-guide/is
  - type: PostmanCollection
    url: collections/topaz.postman_collection.json
  - type: OpenCollection
    url: collections/topaz.opencollection.json
  - type: Documentation
    url: https://www.topaz.sh/docs/directory
  - type: APIReference
    url: https://www.topaz.sh/docs/directory/writer
  - type: APIReference
    url: https://www.topaz.sh/docs/directory/apis
- aid: topaz:topaz-directory-objects-api
  name: Topaz Directory Objects API
  description: Objects in the Zanzibar-style directory - users, groups, resources, and other entities.
  humanURL: https://www.topaz.sh/docs/authorizer-guide/overview
  baseURL: https://localhost:8383
  tags:
  - Directory Objects
  properties:
  - type: OpenAPI
    url: openapi/topaz-directory-objects-api-openapi.yml
  - type: Documentation
    url: https://www.topaz.sh/docs/authorizer-guide/overview
  - type: APIReference
    url: https://www.topaz.sh/docs/authorizer-guide/is
  - type: PostmanCollection
    url: collections/topaz.postman_collection.json
  - type: OpenCollection
    url: collections/topaz.opencollection.json
  - type: Documentation
    url: https://www.topaz.sh/docs/directory
  - type: APIReference
    url: https://www.topaz.sh/docs/directory/writer
  - type: APIReference
    url: https://www.topaz.sh/docs/directory/apis
- aid: topaz:topaz-directory-relations-api
  name: Topaz Directory Relations API
  description: Relations (tuples) connecting subjects to objects in the directory graph.
  humanURL: https://www.topaz.sh/docs/authorizer-guide/overview
  baseURL: https://localhost:8383
  tags:
  - Directory Relations
  properties:
  - type: OpenAPI
    url: openapi/topaz-directory-relations-api-openapi.yml
  - type: Documentation
    url: https://www.topaz.sh/docs/authorizer-guide/overview
  - type: APIReference
    url: https://www.topaz.sh/docs/authorizer-guide/is
  - type: PostmanCollection
    url: collections/topaz.postman_collection.json
  - type: OpenCollection
    url: collections/topaz.opencollection.json
  - type: Documentation
    url: https://www.topaz.sh/docs/directory
  - type: APIReference
    url: https://www.topaz.sh/docs/directory/writer
  - type: APIReference
    url: https://www.topaz.sh/docs/directory/apis
- aid: topaz:topaz-policies-api
  name: Topaz Policies API
  description: OPA policy modules loaded into the authorizer.
  humanURL: https://www.topaz.sh/docs/authorizer-guide/overview
  baseURL: https://localhost:8383
  tags:
  - Policies
  properties:
  - type: OpenAPI
    url: openapi/topaz-policies-api-openapi.yml
  - type: Documentation
    url: https://www.topaz.sh/docs/authorizer-guide/overview
  - type: APIReference
    url: https://www.topaz.sh/docs/authorizer-guide/is
  - type: PostmanCollection
    url: collections/topaz.postman_collection.json
  - type: OpenCollection
    url: collections/topaz.opencollection.json
  - type: Documentation
    url: https://www.topaz.sh/docs/directory
  - type: APIReference
    url: https://www.topaz.sh/docs/directory/writer
  - type: APIReference
    url: https://www.topaz.sh/docs/directory/apis
common:
- type: License
  name: Apache-2.0
  url: https://github.com/aserto-dev/topaz/blob/main/LICENSE
- type: AgenticAccess
  url: agentic-access/topaz-agentic-access.yml
- type: GitHubOrganization
  url: https://github.com/aserto-dev/topaz
- type: LinkedIn
  url: https://www.linkedin.com/company/aserto
- type: Website
  url: https://www.topaz.sh/
- type: Documentation
  url: https://www.topaz.sh/docs
- type: Plans
  url: plans/topaz-plans-pricing.yml
- type: RateLimits
  url: rate-limits/topaz-rate-limits.yml
- type: FinOps
  url: finops/topaz-finops.yml
- type: SourceCode
  url: https://github.com/aserto-dev/topaz
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com