Arthur is a platform for finding AI agents across enterprise environments and providing shared tools to monitor and govern them. Its sensors monitor OpenTelemetry streams, MCP servers, network traffic, cloud APIs, and employee endpoints. Arthur traces agent steps, tool calls, retrieved context, costs, latency, and behavior over time. Teams can apply machine-checkable policies and receive real-time guardrail verdicts for prompt injection, PII exposure, restricted models, and off-policy tool use. Deployment options include hosted SaaS, on-premises, and hybrid; the hybrid evaluation engine runs alongside customer workloads so sensitive data stays in the environment. Arthur lists RBAC, SSO, and deployed engineering support with each option. The Free plan is 0.00 USD per month and includes up to 4 use cases, 2 projects, and 7-day data retention. Premium costs 60.00 USD per month, billed monthly, and includes up to 100 use cases, 10 projects, and 30-day retention. Enterprise pricing is custom. Platforms listed are API, self-hosted, and web.
Who it is for
Arthur suits organizations that need to discover and oversee AI agents across enterprise systems, including teams with deployment or data-residency requirements. The Free plan may fit smaller evaluations; Enterprise includes a dedicated customer success manager and advanced monitoring, SSO, SLAs, and BAA.
What is good
- Monitors streams, servers, traffic, cloud APIs, and endpoints.
- Traces agent steps, tool calls, costs, and latency.
- Offers hosted, on-premises, and hybrid deployment.
- Free plan includes unlimited seats and 7-day retention.
What to know first
- Free plan is limited to 4 use cases and 2 projects.
- Free plan retains data for 7 days.
- Enterprise pricing is custom.
Verdict
Arthur brings agent discovery, observability, and governance into one platform, with deployment choices that include on-premises and hybrid setups. The Free plan has clear use-case, project, and retention limits, while Enterprise pricing requires a custom quote.
Arthur plans and pricing
All plansCompared on model monitoring software
- Free plan
- Yes
- Paid from
- $60/mo
- Drift monitoring
- Yes
- Model performance metrics
- Yes
- Bias monitoring
- Yes
- Alert channels
- webhook, Slack
