ArthurAI

Arthur is an enterprise AI governance and observability platform — an "AI control plane" to detect, govern, and improve AI across an organization. It provides agent discovery across OTEL/MCP/network/cloud APIs, end-to-end agentic tracing and observability, LLM-as-a-judge evaluations, guardrail rules that validate prompts and responses, and organization-wide monitoring policies. Arthur exposes two public REST APIs: Arthur Scope (observability, connectors, datasets, metrics, alerts, and policy governance) authenticated with OAuth2, and the Arthur GenAI Engine (tasks, guardrail rules, prompt and response validation, inferences, and feedback) authenticated with a bearer API key. Deployable as SaaS, hybrid, or on-premises, with first-party Python SDKs and an official Claude Code onboarding skill.

ArthurAI publishes 2 APIs on the APIs.io network: Arthur Scope and Arthur GenAI Engine. Tagged areas include Company, Ai Ml, AI Governance, AI Observability, and LLM Evaluation.

The ArthurAI catalog on APIs.io includes 1 event-driven AsyncAPI specification.

ArthurAI’s developer surface includes documentation, API reference, getting-started guide, engineering blog, support, signup flow, authentication, and 22 more developer resources.

🌐 Visit website 📡 Source on GitHub

45.1/100 developing Agent 61/100 agent native Full breakdown ↓
scored 2026-07-20 · rubric v0.4

2 APIs 1 MCP Servers 0 Features

CompanyAi MlAI GovernanceAI ObservabilityLLM EvaluationModel MonitoringGuardrailsMLOps

API Rating

API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4

Composite quality — 45.1/100 · developing

Contract Quality 9.4 / 25

Developer Ergonomics 14.8 / 20

Commercial Clarity 6.8 / 20

Operational Transparency 4.8 / 13

Governance 0.0 / 12

Discoverability 9.3 / 10

Agent readiness — 61/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 15

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

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/arthurai: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

WellKnown

MCPServer

AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conformance

ErrorCatalog

Lifecycle

Conventions

DataModel

Webhooks

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

OAuthScopes

OAuthScopes

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

Deprecation

Deprecation

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: arthurai
name: ArthurAI
description: 'Arthur is an enterprise AI governance and observability platform — an "AI control plane" to detect, govern,
  and improve AI across an organization. It provides agent discovery across OTEL/MCP/network/cloud APIs, end-to-end agentic
  tracing and observability, LLM-as-a-judge evaluations, guardrail rules that validate prompts and responses, and organization-wide
  monitoring policies. Arthur exposes two public REST APIs: Arthur Scope (observability, connectors, datasets, metrics, alerts,
  and policy governance) authenticated with OAuth2, and the Arthur GenAI Engine (tasks, guardrail rules, prompt and response
  validation, inferences, and feedback) authenticated with a bearer API key. Deployable as SaaS, hybrid, or on-premises, with
  first-party Python SDKs and an official Claude Code onboarding skill.'
url: https://raw.githubusercontent.com/api-evangelist/arthurai/refs/heads/main/apis.yml
x-type: company
x-source: index-ventures-portfolio
x-tier: enriched
x-tier-reason: portfolio-lead-enriched
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
image: https://www.arthur.ai/favicon.ico
tags:
- Company
- Ai Ml
- AI Governance
- AI Observability
- LLM Evaluation
- Model Monitoring
- Guardrails
- MLOps
apis:
- name: Arthur Scope
  description: Observability and governance API — agents, data connectors, datasets, metrics, alert rules, and organization-wide
    policies. OAuth2 authorization-code auth via the Arthur Keycloak realm.
  humanURL: https://docs.arthur.ai
  baseURL: https://platform.arthur.ai/api
  properties:
  - type: OpenAPI
    url: openapi/arthur-scope-openapi.json
  - type: Overlay
    url: overlays/arthurai-scope-overlay.yaml
- name: Arthur GenAI Engine
  description: GenAI guardrails and evaluation API — tasks, default and task-scoped rules, prompt/response validation, inferences,
    and feedback. Bearer API-key auth.
  humanURL: https://docs.arthur.ai
  baseURL: https://engine.platform.arthur.ai
  properties:
  - type: OpenAPI
    url: openapi/arthur-engine-openapi.json
  - type: Overlay
    url: overlays/arthurai-engine-overlay.yaml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.arthur.ai
- type: DeveloperPortal
  url: https://docs.arthur.ai
- type: Documentation
  url: https://docs.arthur.ai
- type: APIReference
  url: https://platform.arthur.ai/api/docs
- type: GettingStarted
  url: https://docs.arthur.ai/docs/welcome-to-arthur-quick-start
- type: Blog
  url: https://www.arthur.ai/blog
- type: GitHubOrganization
  url: https://github.com/arthur-ai
- type: Support
  url: https://discord.gg/ZuJuZJucyG
- type: SignUp
  url: https://engine.platform.arthur.ai/welcome
- type: TermsOfService
  url: https://www.arthur.ai/terms
- type: PrivacyPolicy
  url: https://www.arthur.ai/privacy
- type: StatusPage
  url: https://status.arthur.ai
- type: LLMsTxt
  url: llms/arthur-llms.txt
- type: Packages
  url: packages/arthurai-packages.yml
- type: SDKs
  url: packages/arthurai-packages.yml
- type: WellKnown
  url: well-known/arthurai-well-known.yml
- type: MCPServer
  url: mcp/arthurai-mcp.yml
- type: Overlay
  url: overlays/arthurai-scope-overlay.yaml
- type: Conformance
  url: conformance/arthurai-conformance.yml
- type: ErrorCatalog
  url: errors/arthurai-problem-types.yml
- type: Lifecycle
  url: lifecycle/arthurai-lifecycle.yml
- type: Deprecation
  url: lifecycle/arthurai-lifecycle.yml
- type: Conventions
  url: conventions/arthurai-conventions.yml
- type: DataModel
  url: data-model/arthurai-data-model.yml
- type: Webhooks
  url: asyncapi/arthurai-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DomainSecurity
  url: security/arthurai-domain-security.yml
- type: OAuthScopes
  url: scopes/arthurai-scopes.yml
- type: Authentication
  url: authentication/arthurai-authentication.yml

ArthurAI

API Rating

APIs

Arthur Scope

Arthur GenAI Engine

MCP Servers

arthurai-mcp.yml

Event Specifications

Arthurai Webhooks

Resources