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.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Langfuse the way a machine reads it — 66 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Langfuse scores 32.7/100 (thin), with a separate agent-readiness read of 28/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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How we profile Langfuse
Each block below is one kind of artifact we hold for Langfuse. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 28
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
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.
Scroll within the panel for all 28 ·
Open Collections 30
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONlangfuse 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 within the panel for all 30 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Langfuse Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Langfuse Finops
FINOPSSecurity Posture 4
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Langfuse — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
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 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/langfuse · machine-readable index on apis.io
This is an independent, third-party profile of Langfuse, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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