Langfuse
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.
Langfuse publishes 35 API contracts indexed on the APIs.io network, including BlobStorageIntegrations API, Comments API, DatasetItems API, and 32 more. Tagged areas include Artificial Intelligence, LLM, Observability, Open Source, and Evaluation.
The Langfuse catalog on APIs.io includes 1 Spectral governance ruleset.
Langfuse’s developer surface includes engineering blog, authentication, documentation, API reference, pricing, GitHub presence, and 12 more developer resources.
What this lets a business do 4
Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →
Kin Score
Markets this provider is in provisional
The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.
| Market | Position | Depth | Registered MCP server | Declares compatibility |
|---|---|---|---|---|
| Artifact Hub Cloud-Native Packages | builds-on | 37.7 | - | - |
| Hugging Face Hub Organisations | builds-on | 37.7 | - | - |
Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.
Standards implemented 3
Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.
APIs 35
Individual APIs this provider publishes, each with its own machine-readable definition.
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 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.
Langfuse Evaluation Rules API
The EvaluationRules API from Langfuse — 2 operation(s) for evaluationrules.
Langfuse Evaluators API
The Evaluators API from Langfuse — 3 operation(s) for evaluators.
Langfuse Experiments API
The Experiments API from Langfuse — 2 operation(s) for experiments.
Langfuse Feedback API
The Feedback API from Langfuse — 1 operation(s) for feedback.
Langfuse Unstable Dashboards API
The UnstableDashboards API from Langfuse — 4 operation(s) for unstabledashboards.
Langfuse Unstable Dashboard Widgets API
The UnstableDashboardWidgets API from Langfuse — 2 operation(s) for unstabledashboardwidgets.
Langfuse Unstable Skills API
The UnstableSkills API from Langfuse — 4 operation(s) for unstableskills.
Langfuse Annotation Queues API
The Annotation Queues API from Langfuse — 5 operation(s) for annotation queues.
Langfuse Open Telemetry API
The Open Telemetry API from Langfuse — 1 operation(s) for open telemetry.
Scroll for all 35
Open Collections 29
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
langfuse AnnotationQueues API
OPEN COLLECTIONlangfuse AnnotationQueues BlobStorageIntegrations API
OPEN COLLECTIONlangfuse AnnotationQueues Comments API
OPEN COLLECTIONlangfuse AnnotationQueues DatasetItems API
OPEN COLLECTIONlangfuse AnnotationQueues DatasetRunItems API
OPEN COLLECTIONlangfuse AnnotationQueues Datasets API
OPEN COLLECTIONlangfuse AnnotationQueues Health API
OPEN COLLECTIONlangfuse AnnotationQueues Ingestion API
OPEN COLLECTIONlangfuse AnnotationQueues LegacyMetricsV1 API
OPEN COLLECTIONlangfuse AnnotationQueues LegacyObservationsV1 API
OPEN COLLECTIONlangfuse AnnotationQueues LegacyScoreV1 API
OPEN COLLECTIONlangfuse AnnotationQueues LlmConnections API
OPEN COLLECTIONlangfuse AnnotationQueues Media API
OPEN COLLECTIONlangfuse AnnotationQueues Metrics API
OPEN COLLECTIONlangfuse AnnotationQueues Models API
OPEN COLLECTIONlangfuse AnnotationQueues Observations API
OPEN COLLECTIONlangfuse AnnotationQueues Opentelemetry API
OPEN COLLECTIONlangfuse AnnotationQueues Organizations API
OPEN COLLECTIONlangfuse AnnotationQueues Projects API
OPEN COLLECTIONlangfuse AnnotationQueues Prompts API
OPEN COLLECTIONlangfuse AnnotationQueues PromptVersion API
OPEN COLLECTIONlangfuse AnnotationQueues Scim API
OPEN COLLECTIONlangfuse AnnotationQueues ScoreConfigs API
OPEN COLLECTIONlangfuse AnnotationQueues Scores API
OPEN COLLECTIONlangfuse AnnotationQueues Sessions API
OPEN COLLECTIONlangfuse AnnotationQueues Trace API
OPEN COLLECTIONlangfuse AnnotationQueues UnstableEvaluationRules API
OPEN COLLECTIONlangfuse AnnotationQueues UnstableEvaluators API
OPEN COLLECTIONlangfuse
OPEN COLLECTIONScroll for all 29
MCP Servers 1
Model Context Protocol servers that expose these APIs to AI agents.
Langfuse API pricing
Not yet checked against Langfuse's own pricing page. Compiled by API Evangelist on 2026-05-08 from langfuse.com/pricing; confirm before you rely on a figure. A free plan or tier is listed.
| Plan | Price |
|---|---|
| Self-Hosted (Open Source) free | Free |
| Hobby (Cloud) free | Free |
| Core (Cloud) paid | $29 per subscription · Free |
| Pro (Cloud) paid | $199 per subscription · Free |
| Enterprise (Cloud) enterprise | $2499 per subscription · Free |
Plan details, limits and sources →
Rate limits
- Hobby Cloud Monthly Units: 50000 unit
- Core/Pro/Enterprise Monthly Units (Included): 100000 unit
- Enterprise Custom Rate Limits: contract varies
Compiled by API Evangelist, not yet checked against Langfuse's documentation. All 4 limits →
Pricing Plans 1
Published pricing tiers and plan structures.
Rate Limits 1
Documented rate limits and quota policies.
Langfuse Rate Limits
RATE LIMITSCompliance 1
Attestations the provider states (SOC 2, ISO 27001 and others), quoted from its own trust page. APIs.io verifies none of them.
FinOps 1
Cost, billing, and metering signals for API financial operations.
Langfuse Finops
FINOPSSpectral Rules 1
Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.
Langfuse API Rules
SPECTRALSecurity Posture 4
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access (API Evangelist recommendations) 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 4
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 2
Properties that don't map to a standard resource type
Source (apis.yml)
Langfuse API — frequently asked questions
Does Langfuse have an API?
Yes. APIs.io lists 35 APIs from Langfuse, including Langfuse BlobStorageIntegrations API, Langfuse Comments API and Langfuse DatasetItems API, and 32 more.
Is there an OpenAPI specification for the Langfuse API?
Yes. APIs.io indexes 35 OpenAPI specifications for Langfuse, each linked for download from this page.
How do I authenticate with the Langfuse API?
Langfuse uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Langfuse Authentication.
How much does the Langfuse API cost?
APIs.io lists 5 pricing plans for Langfuse, with each plan's price, limits and inclusions under Pricing on this page.
Does Langfuse have an MCP server?
Yes. APIs.io lists 1 MCP server for Langfuse: Remote MCP server at langfuse.com over HTTP; 4 tools listed.
Is the Langfuse API ready for AI agents?
Langfuse has a Kin Score of 36.5 out of 100 (thin) and an Agent Readiness score of 36.2 (agent-ready), scored by API Evangelist on 2026-11-13.
Work with this as data
Every provider here is available over the APIs.io API and to AI agents over MCP.