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LangWatch Traces API

The Traces API from LangWatch — 3 operation(s) for traces.

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

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

This API exposes 3 operations across 3 paths, and defines 11 schemas. It is described by OpenAPI 3.1.0, at version 1.0.0.

Requests are made against a single base URL, https://app.langwatch.ai.

3 operations 3 paths 11 schemas 1 GET2 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.1.0
API Version
1.0.0
Server
https://app.langwatch.ai
Authentication
API Key, HTTP Bearer
Resource Areas
1

Authentication & Security 2

LangWatch Traces API declares 2 security schemes for authenticating requests. An API key is passed in the header as X-Auth-Token (project_api_key). It accepts HTTP bearer tokens (admin_api_key). By default, every request must be authenticated.

  • project_api_key — Project API key for sending traces and accessing project-scoped resources. Format: sk-lw-... (no underscore). Obtain one by creating a project via the Admin AP…
  • admin_api_key — Admin API key for organization-level operations (managing projects, API keys). Create one in Settings API Keys or via POST /api/api-keys. Format: sk-lw-{id}{se…

Paths & Operations 3

Across 3 paths, the API surfaces 3 operations — 1 GET, 2 POST. Each is listed below with its method, path, parameters, and response codes.

Traces 3
POST
/api/trace/search
Search traces
body → 200
POST
/api/traces/search
Search traces for a project
postApiTracesSearch body → 200400401422500
GET
/api/traces/{traceId}
Get a single trace by ID.
getApiTracesByTraceId 3 params → 200400401404409422500

Schemas 11

The contract defines 11 schemas that model the data the API accepts and returns. The most detailed are Trace (11 properties), Evaluation (10 properties), Metrics (6 properties), SearchRequest (6 properties). Each schema is shown below with its type and property counts.

EvaluationTimestamps
object
2 properties
Metadata
object
2 properties
Output
object
1 property
Metrics
object
6 properties
Trace
object
11 properties
Timestamps
object
3 properties
SearchResponse
object
2 properties
Input
object
1 property
SearchRequest
object
6 properties
Evaluation
object
10 properties
Pagination
object
3 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

langwatch-traces-api-openapi.yml Raw ↑

Other APIs LangWatch publishes across the network.

LangWatch Agents API
LangWatch Analytics API
LangWatch Annotations API
LangWatch Api Keys API
LangWatch Budgets API
LangWatch Cache Rules API
LangWatch Dashboards API
LangWatch Dataset API
LangWatch Evaluations V3 API
LangWatch Evaluators API
LangWatch Graphs API
LangWatch LangWatch API API
Where this information came from

This is an independent, third-party profile of LangWatch Traces 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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