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Langfuse Observations API

The Observations API from Langfuse — 1 operation(s) for observations.

Langfuse Observations API is one of 28 APIs that Langfuse publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Observations. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

This API exposes 1 operation across 1 path, and defines 4 schemas. It is described by OpenAPI 3.0.1, at version 1.0.

Requests are made against the base URL https://cloud.langfuse.com/api/public.

1 operations 1 paths 4 schemas 1 GET

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.0.1
API Version
1.0
Base URL
https://cloud.langfuse.com/api/public
Authentication
HTTP Basic
Resource Areas
1

Authentication & Security 1

Langfuse Observations API declares 1 security scheme for authenticating requests. It accepts HTTP basic authentication (BasicAuth).

Paths & Operations 1

Across 1 path, the API surfaces 1 operation — 1 GET. Each is listed below with its method, path, parameters, and response codes.

Observations 1
GET
/api/public/v2/observations
Get a list of observations with cursor-based pagination and flexible field selection. Cursor-based Pagination This endpoint uses cursor-based pagination for efficient traversal of large datasets. The…
observations_getMany 16 params → 200400401403404405

Schemas 4

The contract defines 4 schemas that model the data the API accepts and returns. The most detailed are ObservationV2 (34 properties), ObservationsV2Response (2 properties), ObservationsV2Meta (1 property). Each schema is shown below with its type and property counts.

ObservationsV2Response
object
Response containing observations with field-group-based filtering and cursor-based pagination. The data array contains observation objects with only the reques…
2 properties 2 required
ObservationV2
object
An observation from the v2 API with field-group-based selection. Core fields are always present. Other fields are included only when their field group is reque…
34 properties 4 required
ObservationsV2Meta
object
Metadata for cursor-based pagination
1 property
ObservationLevel
string

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

langfuse-observations-api-openapi.yml Raw ↑

Other APIs Langfuse publishes across the network.

Langfuse AnnotationQueues API
Langfuse BlobStorageIntegrations API
Langfuse Comments API
Langfuse DatasetItems API
Langfuse DatasetRunItems API
Langfuse Datasets API
Langfuse Health API
Langfuse Ingestion API
Langfuse LegacyMetricsV1 API
Langfuse LegacyObservationsV1 API
Langfuse LegacyScoreV1 API
Langfuse LlmConnections API
Where this information came from

This is an independent, third-party profile of Langfuse Observations API, 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.

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