LangWatch
LangWatch is an open-source LLM observability, evaluation, and AI agent testing platform. Built around OpenTelemetry-native tracing, LangWatch lets teams instrument LLM applications (LangChain, LangGraph, DSPy, OpenAI Agents, LiteLLM, Pydantic AI, CrewAI, AWS Bedrock, and more), run real-time and batch evaluations, version and deploy prompts, simulate multi-turn agent conversations against scripted scenarios and Judge Agents, manage labeled datasets, and govern model traffic through a virtual-key AI Gateway with budgets and semantic caching. The platform exposes a REST API at app.langwatch.ai, ships Python and TypeScript SDKs plus an MCP server, publishes the companion `scenario` agent-testing framework and `better-agents` standards, and runs on Apache-2.0 core (with `ee/` enterprise modules under commercial license) — deployable as LangWatch Cloud or self-hosted via Docker Compose, Helm, Kind, or full Kubernetes.
LangWatch publishes 28 APIs on the APIs.io network, including Agents API, Analytics API, Annotations API, and 25 more. Tagged areas include AI, Artificial Intelligence, LLM, LLM Observability, and LLM Evaluation.
The LangWatch catalog on APIs.io includes 1 JSON-LD context.
LangWatch’s developer surface includes authentication, developer portal, documentation, getting-started guide, signup flow, pricing, engineering blog, and 33 more developer resources.
Kin Score
APIs 28
Individual APIs this provider publishes, each with its own machine-readable definition.
LangWatch Agents API
The Agents API from LangWatch — 2 operation(s) for agents.
LangWatch Analytics API
The Analytics API from LangWatch — 1 operation(s) for analytics.
LangWatch Annotations API
The Annotations API from LangWatch — 3 operation(s) for annotations.
LangWatch Api Keys API
The Api Keys API from LangWatch — 2 operation(s) for api keys.
LangWatch Budgets API
The Budgets API from LangWatch — 2 operation(s) for budgets.
LangWatch Cache Rules API
The Cache Rules API from LangWatch — 2 operation(s) for cache rules.
LangWatch Dashboards API
The Dashboards API from LangWatch — 3 operation(s) for dashboards.
LangWatch Dataset API
The Dataset API from LangWatch — 7 operation(s) for dataset.
LangWatch Evaluations V3 API
The Evaluations V3 API from LangWatch — 2 operation(s) for evaluations v3.
LangWatch Evaluators API
The Evaluators API from LangWatch — 3 operation(s) for evaluators.
LangWatch Graphs API
The Graphs API from LangWatch — 2 operation(s) for graphs.
LangWatch LangWatch API API
The LangWatch API API from LangWatch — 1 operation(s) for langwatch api.
LangWatch Model Defaults API
The Model Defaults API from LangWatch — 2 operation(s) for model defaults.
LangWatch Model Providers API
The Model Providers API from LangWatch — 2 operation(s) for model providers.
LangWatch Monitors API
The Monitors API from LangWatch — 3 operation(s) for monitors.
LangWatch Projects API
The Projects API from LangWatch — 2 operation(s) for projects.
LangWatch Prompts API
The Prompts API from LangWatch — 8 operation(s) for prompts.
LangWatch Providers API
The Providers API from LangWatch — 2 operation(s) for providers.
LangWatch Scenario Events API
The Scenario Events API from LangWatch — 1 operation(s) for scenario events.
LangWatch Scenarios API
The Scenarios API from LangWatch — 2 operation(s) for scenarios.
LangWatch Secrets API
The Secrets API from LangWatch — 2 operation(s) for secrets.
LangWatch Simulation Runs API
The Simulation Runs API from LangWatch — 3 operation(s) for simulation runs.
LangWatch Suites API
The Suites API from LangWatch — 4 operation(s) for suites.
LangWatch Trace API
The Trace API from LangWatch — 3 operation(s) for trace.
LangWatch Traces API
The Traces API from LangWatch — 3 operation(s) for traces.
LangWatch Triggers API
The Triggers API from LangWatch — 2 operation(s) for triggers.
LangWatch Virtual Keys API
The Virtual Keys API from LangWatch — 4 operation(s) for virtual keys.
LangWatch Workflows API
The Workflows API from LangWatch — 2 operation(s) for workflows.
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Open Collections 1
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
LangWatch API
OPEN COLLECTIONPricing Plans 1
Published pricing tiers and plan structures.
Rate Limits 1
Documented rate limits and quota policies.
Langwatch Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals for API financial operations.
Langwatch Finops
FINOPSFeatures 17
Notable capabilities this provider offers.
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Semantic Vocabularies 1
JSON-LD contexts and semantic vocabularies used across these APIs.
Langwatch Context
JSON-LDSecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Get Started 3
Portal, sign-up, and the first successful call
Documentation 9
Reference material describing how the API behaves
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Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Build 9
SDKs, sample code, and the tooling you integrate with
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Access & Security 3
Authentication, authorization, and security posture
Learn 1
Tutorials, courses, talks, and written guidance
Operate 3
Status, limits, changes, and where to get help
Commercial 6
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 1
Properties that don't map to a standard resource type