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 62 API contracts indexed on the APIs.io network, including Agents API, Analytics API, Annotations API, and 59 more. Tagged areas include Artificial Intelligence, LLM, LLM Observability, LLM Evaluation, and Agent Testing.
The LangWatch catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.
LangWatch’s developer surface includes authentication, developer portal, documentation, getting-started guide, signup flow, pricing, engineering blog, and 39 more developer resources.
What this lets a business do 4
Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →
Kin Score
Standards implemented 2
Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.
APIs 62
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 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 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 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 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 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 Workflows API
The Workflows API from LangWatch — 2 operation(s) for workflows.
LangWatch Admin API
The Admin API from LangWatch — 2 operation(s) for admin.
LangWatch Agent Cache API
The Agent Cache API from LangWatch — 2 operation(s) for agent cache.
LangWatch Analytics / LangWatchQL API
The Analytics / LangWatchQL API from LangWatch — 8 operation(s) for analytics / langwatchql.
LangWatch Auth API
The Auth API from LangWatch — 25 operation(s) for auth.
LangWatch Browser telemetry API
The Browser telemetry API from LangWatch — 1 operation(s) for browser telemetry.
LangWatch Bug Reports API
The Bug Reports API from LangWatch — 1 operation(s) for bug reports.
LangWatch Checkup API
The Checkup API from LangWatch — 2 operation(s) for checkup.
LangWatch Coding Agent API
The Coding Agent API from LangWatch — 3 operation(s) for coding agent.
LangWatch Datasets API
The Datasets API from LangWatch — 1 operation(s) for datasets.
LangWatch Elevenlabs API
The Elevenlabs API from LangWatch — 1 operation(s) for elevenlabs.
LangWatch Evaluations API
The Evaluations API from LangWatch — 5 operation(s) for evaluations.
LangWatch Events API
The Events API from LangWatch — 2 operation(s) for events.
LangWatch Experiments API
The Experiments API from LangWatch — 11 operation(s) for experiments.
LangWatch Files API
The Files API from LangWatch — 3 operation(s) for files.
LangWatch Gateway API
The Gateway API from LangWatch — 14 operation(s) for gateway.
LangWatch Gateway Spend API
The Gateway Spend API from LangWatch — 4 operation(s) for gateway spend.
LangWatch Governance / Ingestion Templates API
The Governance / Ingestion Templates API from LangWatch — 5 operation(s) for governance / ingestion templates.
LangWatch Grants API
The Grants API from LangWatch — 2 operation(s) for grants.
LangWatch Groups API
The Groups API from LangWatch — 6 operation(s) for groups.
LangWatch Instant Evals API
The Instant Evals API from LangWatch — 6 operation(s) for instant evals.
LangWatch Internal API
The Internal API from LangWatch — 3 operation(s) for internal.
LangWatch Invites API
The Invites API from LangWatch — 2 operation(s) for invites.
LangWatch Langy API
The Langy API from LangWatch — 16 operation(s) for langy.
LangWatch Me API
The Me API from LangWatch — 2 operation(s) for me.
LangWatch Members API
The Members API from LangWatch — 3 operation(s) for members.
LangWatch Ops API
The Ops API from LangWatch — 1 operation(s) for ops.
LangWatch Organization API
The Organization API from LangWatch — 1 operation(s) for organization.
LangWatch Organizations (Self-Hosted) API
The Organizations (Self-Hosted) API from LangWatch — 2 operation(s) for organizations (self-hosted).
LangWatch Platform Health API
The Platform Health API from LangWatch — 2 operation(s) for platform health.
LangWatch Query API
The Query API from LangWatch — 3 operation(s) for query.
LangWatch Role Bindings API
The Role Bindings API from LangWatch — 2 operation(s) for role bindings.
LangWatch Roles API
The Roles API from LangWatch — 3 operation(s) for roles.
LangWatch Run Plans API
The Run Plans API from LangWatch — 4 operation(s) for run plans.
LangWatch SCIM API
The SCIM API from LangWatch — 8 operation(s) for scim.
LangWatch SCIM Tokens API
The SCIM Tokens API from LangWatch — 2 operation(s) for scim tokens.
LangWatch Slack connections API
The Slack connections API from LangWatch — 1 operation(s) for slack connections.
LangWatch Stored Objects API
The Stored Objects API from LangWatch — 3 operation(s) for stored objects.
LangWatch Teams API
The Teams API from LangWatch — 5 operation(s) for teams.
LangWatch Test Suites API
The Test Suites API from LangWatch — 3 operation(s) for test suites.
LangWatch User Avatar API
The User Avatar API from LangWatch — 1 operation(s) for user avatar.
LangWatch Webhooks API
The Webhooks API from LangWatch — 10 operation(s) for webhooks.
Scroll for all 62
Open Collections 29
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
LangWatch Agents API
OPEN COLLECTIONLangWatch Agents Analytics API
OPEN COLLECTIONLangWatch Agents Annotations API
OPEN COLLECTIONLangWatch Agents Api Keys API
OPEN COLLECTIONLangWatch Agents Budgets API
OPEN COLLECTIONLangWatch Agents Cache Rules API
OPEN COLLECTIONLangWatch Agents Dashboards API
OPEN COLLECTIONLangWatch Agents Dataset API
OPEN COLLECTIONLangWatch Agents Evaluations V3 API
OPEN COLLECTIONLangWatch Agents Evaluators API
OPEN COLLECTIONLangWatch Agents Graphs API
OPEN COLLECTIONLangWatch Agents LangWatch API API
OPEN COLLECTIONLangWatch Agents Model Defaults API
OPEN COLLECTIONLangWatch Agents Model Providers API
OPEN COLLECTIONLangWatch Agents Monitors API
OPEN COLLECTIONLangWatch Agents Projects API
OPEN COLLECTIONLangWatch Agents Prompts API
OPEN COLLECTIONLangWatch Agents Providers API
OPEN COLLECTIONLangWatch Agents Scenario Events API
OPEN COLLECTIONLangWatch Agents Scenarios API
OPEN COLLECTIONLangWatch Agents Secrets API
OPEN COLLECTIONLangWatch Agents Simulation Runs API
OPEN COLLECTIONLangWatch Agents Suites API
OPEN COLLECTIONLangWatch Agents Trace API
OPEN COLLECTIONLangWatch Agents Traces API
OPEN COLLECTIONLangWatch Agents Triggers API
OPEN COLLECTIONLangWatch Agents Virtual Keys API
OPEN COLLECTIONLangWatch Agents Workflows API
OPEN COLLECTIONLangWatch API
OPEN COLLECTIONScroll for all 29
LangWatch API pricing
Prices published by LangWatch, read 2026-10-07 from langwatch.ai/pricing.
| Plan | Price |
|---|---|
| Developer | €0 free forever Includes: 50k events / month, 14-day data access, 2 users, 3 scenarios, 3 simulations, 3 custom evals, Communi |
| Growth | €29/ core-seat/ month Includes: 200k events included, 30-day retention included, Unlimited lite-users, Unlimited simulations, evals, |
| Enterprise | Custom Includes: Hybrid, self-hosted or on-prem, custom retention, SSO/RBAC, audit logs & SLAs |
Plan details, limits and sources →
Rate limits
- : 50000 events
- : 200000 events
- : unlimited events
Compiled by API Evangelist, not yet checked against LangWatch's documentation. All 4 limits →
Billed by: core-seat · FinOps profile →
Pricing Plans 1
Published pricing tiers and plan structures.
Rate Limits 1
Documented rate limits and quota policies.
Langwatch Rate Limits
RATE LIMITSService Levels 1
Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.
LangWatch
SLAFinOps 1
Cost, billing, and metering signals for API financial operations.
Langwatch Finops
FINOPSFeatures 17
Notable capabilities this provider offers.
Scroll for all 17
Semantic Vocabularies 1
JSON-LD contexts and semantic vocabularies used across these APIs.
Langwatch Context
JSON-LDSpectral Rules 1
Spectral governance rulesets for linting and validating these APIs.
LangWatch API Rules
SPECTRALSecurity 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 11
Reference material describing how the API behaves
Scroll for all 11
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Build 9
SDKs, sample code, and the tooling you integrate with
Scroll for all 9
Access & Security 4
Authentication, authorization, and security posture
Learn 1
Tutorials, courses, talks, and written guidance
Operate 5
Status, limits, changes, and where to get help
Commercial 6
Pricing, plans, and the legal terms of use
Company 4
The organization behind the API
Other 2
Properties that don't map to a standard resource type
Source (apis.yml)
LangWatch API — frequently asked questions
Does LangWatch have an API?
Yes. APIs.io lists 62 APIs from LangWatch, including LangWatch Agents API, LangWatch Analytics API and LangWatch Annotations API, and 59 more.
Is there an OpenAPI specification for the LangWatch API?
Yes. APIs.io indexes 62 OpenAPI specifications for LangWatch, each linked for download from this page.
How do I authenticate with the LangWatch API?
LangWatch uses bearer-token authentication (apiKey/http · 2 schemes). The details are profiled on APIs.io as Langwatch Authentication.
How much does the LangWatch API cost?
LangWatch publishes its prices; its Developer plan is €0 free forever as of 2026-10-07. APIs.io lists 3 pricing plans for LangWatch, with each plan's price, limits and inclusions under Pricing on this page.
Is the LangWatch API ready for AI agents?
LangWatch has a Kin Score of 58.6 out of 100 (strong) and an Agent Readiness score of 28.1 (agent-aware), scored by API Evangelist on 2026-11-06.
Work with this as data
Every provider here is available over the APIs.io API and to AI agents over MCP.