Langtrace AI

Langtrace is an open-source, OpenTelemetry-based end-to-end observability platform for LLM applications, built by Scale3 Labs. It captures real-time traces, metrics, and evaluations for popular LLMs, agent frameworks, and vector databases. Traces are ingested via an OTLP/HTTP endpoint and a REST API exposes projects, prompt registry, and trace retrieval. Available as a free self-hosted deployment or as Langtrace Cloud.

Langtrace AI publishes 3 APIs on the APIs.io network: Projects API, Prompt Registry API, and Traces API. Tagged areas include AI, LLM, Observability, OpenTelemetry, and Tracing.

Langtrace AI’s developer surface includes authentication, documentation, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

39.3/100 thin ▬ flat Agent 38/100 agent ready Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1

AccessFreemiumSelf serve⚡ Free to try

3 APIs

AILLMObservabilityOpenTelemetryTracingOpen Source

Kin Score

Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1

Composite quality — 39.3/100 · thin

Contract Quality 15.3 / 25

Developer Ergonomics 3.9 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 4.8 / 13

Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 38/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/langtrace: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Langtrace Rate Limits

4 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: langtrace
url: https://raw.githubusercontent.com/api-evangelist/langtrace/refs/heads/main/apis.yml
name: Langtrace AI
kind: company
description: Langtrace is an open-source, OpenTelemetry-based end-to-end observability platform for LLM applications, built
  by Scale3 Labs. It captures real-time traces, metrics, and evaluations for popular LLMs, agent frameworks, and vector databases.
  Traces are ingested via an OTLP/HTTP endpoint and a REST API exposes projects, prompt registry, and trace retrieval. Available
  as a free self-hosted deployment or as Langtrace Cloud.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/langtrace.png
tags:
- AI
- LLM
- Observability
- OpenTelemetry
- Tracing
- Open Source
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.19'
apis:
- aid: langtrace:langtrace-projects-api
  name: Langtrace AI Projects API
  description: Project and API key management.
  humanURL: https://docs.langtrace.ai/api-reference/traces/POST-trace
  baseURL: https://app.langtrace.ai/api
  tags:
  - Projects
  properties:
  - type: OpenAPI
    url: openapi/langtrace-projects-api-openapi.yml
  - type: Documentation
    url: https://docs.langtrace.ai/supported-integrations/otel-support/otel-configuration
  - type: APIReference
    url: https://docs.langtrace.ai/api-reference/traces/POST-trace
  - type: PostmanCollection
    url: collections/langtrace.postman_collection.json
  - type: OpenCollection
    url: collections/langtrace.opencollection.json
  - type: GitHub
    url: https://github.com/Scale3-Labs/langtrace
  - type: Documentation
    url: https://docs.langtrace.ai/api-reference/project/POST-project
  - type: APIReference
    url: https://docs.langtrace.ai/api-reference/project/POST-project-api-key
  - type: Documentation
    url: https://docs.langtrace.ai/api-reference/prompt-registry/GET-prompt-registry
  - type: APIReference
    url: https://docs.langtrace.ai/api-reference/prompt-registry/GET-prompt-registry
  - type: Documentation
    url: https://docs.langtrace.ai/api-reference/traces/POST-traces
  - type: APIReference
    url: https://docs.langtrace.ai/api-reference/traces/POST-traces
- aid: langtrace:langtrace-prompt-registry-api
  name: Langtrace AI Prompt Registry API
  description: Versioned prompt storage and retrieval.
  humanURL: https://docs.langtrace.ai/api-reference/traces/POST-trace
  baseURL: https://app.langtrace.ai/api
  tags:
  - Prompt Registry
  properties:
  - type: OpenAPI
    url: openapi/langtrace-prompt-registry-api-openapi.yml
  - type: Documentation
    url: https://docs.langtrace.ai/supported-integrations/otel-support/otel-configuration
  - type: APIReference
    url: https://docs.langtrace.ai/api-reference/traces/POST-trace
  - type: PostmanCollection
    url: collections/langtrace.postman_collection.json
  - type: OpenCollection
    url: collections/langtrace.opencollection.json
  - type: GitHub
    url: https://github.com/Scale3-Labs/langtrace
  - type: Documentation
    url: https://docs.langtrace.ai/api-reference/project/POST-project
  - type: APIReference
    url: https://docs.langtrace.ai/api-reference/project/POST-project-api-key
  - type: Documentation
    url: https://docs.langtrace.ai/api-reference/prompt-registry/GET-prompt-registry
  - type: APIReference
    url: https://docs.langtrace.ai/api-reference/prompt-registry/GET-prompt-registry
  - type: Documentation
    url: https://docs.langtrace.ai/api-reference/traces/POST-traces
  - type: APIReference
    url: https://docs.langtrace.ai/api-reference/traces/POST-traces
- aid: langtrace:langtrace-traces-api
  name: Langtrace AI Traces API
  description: OpenTelemetry trace ingestion and retrieval.
  humanURL: https://docs.langtrace.ai/api-reference/traces/POST-trace
  baseURL: https://app.langtrace.ai/api
  tags:
  - Traces
  properties:
  - type: OpenAPI
    url: openapi/langtrace-traces-api-openapi.yml
  - type: Documentation
    url: https://docs.langtrace.ai/supported-integrations/otel-support/otel-configuration
  - type: APIReference
    url: https://docs.langtrace.ai/api-reference/traces/POST-trace
  - type: PostmanCollection
    url: collections/langtrace.postman_collection.json
  - type: OpenCollection
    url: collections/langtrace.opencollection.json
  - type: GitHub
    url: https://github.com/Scale3-Labs/langtrace
  - type: Documentation
    url: https://docs.langtrace.ai/api-reference/project/POST-project
  - type: APIReference
    url: https://docs.langtrace.ai/api-reference/project/POST-project-api-key
  - type: Documentation
    url: https://docs.langtrace.ai/api-reference/prompt-registry/GET-prompt-registry
  - type: APIReference
    url: https://docs.langtrace.ai/api-reference/prompt-registry/GET-prompt-registry
  - type: Documentation
    url: https://docs.langtrace.ai/api-reference/traces/POST-traces
  - type: APIReference
    url: https://docs.langtrace.ai/api-reference/traces/POST-traces
common:
- type: AgenticAccess
  url: agentic-access/langtrace-agentic-access.yml
- type: DomainSecurity
  url: security/langtrace-domain-security.yml
- type: Authentication
  url: authentication/langtrace-authentication.yml
- type: GitHubOrganization
  url: https://github.com/Scale3-Labs
- type: LinkedIn
  url: https://www.linkedin.com/company/langtrace
- type: Website
  url: https://www.langtrace.ai
- type: Documentation
  url: https://docs.langtrace.ai
- type: Plans
  url: plans/langtrace-plans-pricing.yml
- type: RateLimits
  url: rate-limits/langtrace-rate-limits.yml
- type: FinOps
  url: finops/langtrace-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Langtrace AI

Kin Score

APIs 3

Langtrace AI Projects API

Langtrace AI Prompt Registry API

Langtrace AI Traces API

Open Collections 1

Langtrace AI API

Pricing Plans 1

Langtrace Plans Pricing

Rate Limits 1

Langtrace Rate Limits

FinOps 1

Langtrace Finops

Security Posture 2

Langtrace Authentication

Langtrace Domain Security

Agentic Access 1

Langtrace Agentic Access

Resources