Features
Real-time credit ledger with grants, rollovers, expiration
Feature entitlement gating (boolean and metered)
Subscription lifecycle management (upgrade, downgrade, proration)
Usage-based billing (per-unit, per-seat, credit-based)
Billing controls (spend caps, auto top-ups, usage alerts)
Flexible pricing (plans, variants, add-ons, tiers, graduated)
Sub-entity balances and plans
Webhooks and Slack/Discord notifications
Fail-open defaults for reliability
Observability via ClickHouse (usage history, charts, logs)
Plan versioning and grandfathering
Trial and auto top-up management
Minimal API: attach, check, track
Self-hostable open-source
Stripe as payment processor
Trace visibility for agent steps (prompts, retrievals, tool calls, outputs)
LLM-as-judge evaluation for relevance, toxicity, quality scoring
Dataset creation from traces for reproducible testing
Experiment management and regression benchmarking
Built-in Prompt IDE for iterative prompt optimization
Self-hosted deployment on local, Docker, Kubernetes
Phoenix Cloud managed hosting option
Vendor-agnostic support for any model/framework
Native OpenTelemetry integration
OpenInference specification for LLM telemetry
Human annotation and automated labeling
Ghost trajectories to simulate alternative agent paths
Eval-as-you-test for early quality feedback
One-click integration with LlamaIndex
