# Langfuse

**Canonical:** https://apis.io/providers/langfuse/  
**Website:** https://langfuse.com/  
**APIs profiled:** 28

Langfuse is an open-source LLM engineering platform offering tracing, evaluations, prompt management, datasets, and metrics. The Langfuse API supports both self-hosted and multi-region cloud deployments (US, EU, Japan, HIPAA-compliant US) and integrates with LangChain, LlamaIndex, OpenTelemetry, and any LLM stack.

## Kin Score — 31.9 / 100 (thin)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 31.9).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 46.7 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 13.2 |
| Developer Ergonomics | 21.4 |
| Commercial Clarity | 34.2 |
| Access Clarity | 34.2 |

## Agent readiness — 28.1 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | partial |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (28)

- **Langfuse AnnotationQueues API** — The AnnotationQueues API from Langfuse — 5 operation(s) for annotationqueues.
- **Langfuse BlobStorageIntegrations API** — The BlobStorageIntegrations API from Langfuse — 2 operation(s) for blobstorageintegrations.
- **Langfuse Comments API** — The Comments API from Langfuse — 2 operation(s) for comments.
- **Langfuse DatasetItems API** — The DatasetItems API from Langfuse — 2 operation(s) for datasetitems.
- **Langfuse DatasetRunItems API** — The DatasetRunItems API from Langfuse — 1 operation(s) for datasetrunitems.
- **Langfuse Datasets API** — The Datasets API from Langfuse — 4 operation(s) for datasets.
- **Langfuse Health API** — The Health API from Langfuse — 1 operation(s) for health.
- **Langfuse Ingestion API** — The Ingestion API from Langfuse — 1 operation(s) for ingestion.
- **Langfuse LegacyMetricsV1 API** — The LegacyMetricsV1 API from Langfuse — 1 operation(s) for legacymetricsv1.
- **Langfuse LegacyObservationsV1 API** — The LegacyObservationsV1 API from Langfuse — 2 operation(s) for legacyobservationsv1.
- **Langfuse LegacyScoreV1 API** — The LegacyScoreV1 API from Langfuse — 2 operation(s) for legacyscorev1.
- **Langfuse LlmConnections API** — The LlmConnections API from Langfuse — 2 operation(s) for llmconnections.
- **Langfuse Media API** — The Media API from Langfuse — 2 operation(s) for media.
- **Langfuse Metrics API** — The Metrics API from Langfuse — 1 operation(s) for metrics.
- **Langfuse Models API** — The Models API from Langfuse — 2 operation(s) for models.
- **Langfuse Observations API** — The Observations API from Langfuse — 1 operation(s) for observations.
- **Langfuse Opentelemetry API** — The Opentelemetry API from Langfuse — 1 operation(s) for opentelemetry.
- **Langfuse Organizations API** — The Organizations API from Langfuse — 4 operation(s) for organizations.
- **Langfuse Projects API** — The Projects API from Langfuse — 4 operation(s) for projects.
- **Langfuse Prompts API** — The Prompts API from Langfuse — 2 operation(s) for prompts.
- **Langfuse PromptVersion API** — The PromptVersion API from Langfuse — 1 operation(s) for promptversion.
- **Langfuse Scim API** — The Scim API from Langfuse — 5 operation(s) for scim.
- **Langfuse ScoreConfigs API** — The ScoreConfigs API from Langfuse — 2 operation(s) for scoreconfigs.
- **Langfuse Scores API** — The Scores API from Langfuse — 2 operation(s) for scores.
- **Langfuse Sessions API** — The Sessions API from Langfuse — 2 operation(s) for sessions.
- **Langfuse Trace API** — The Trace API from Langfuse — 2 operation(s) for trace.
- **Langfuse UnstableEvaluationRules API** — The UnstableEvaluationRules API from Langfuse — 2 operation(s) for unstableevaluationrules.
- **Langfuse UnstableEvaluators API** — The UnstableEvaluators API from Langfuse — 2 operation(s) for unstableevaluators.

## Agentic access (1)

- **Langfuse Agentic Access** — 96 operations · 46 acting

## Security (4)

- **Langfuse Authentication** — http · 1 scheme
- **Langfuse Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Langfuse Vulnerability Disclosure** — disclosure policy published
- **Langfuse Trust Center** — SOC 2, ISO 27001, HIPAA, GDPR

## Plans (1)

- **Langfuse Plans Pricing**

## Tags

Artificial Intelligence, LLM, Observability, Open-Source, Evaluations

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/langfuse/). Scores are computed from the provider's own public artifacts under a published rubric.