LangDB

LangDB is an AI gateway and governance platform that routes requests across 250+ models from providers such as OpenAI, Anthropic, Google, Meta, Mistral, and DeepSeek through a single project-scoped, OpenAI-compatible REST API. It layers routing, guardrails, tracing, cost control, and an MCP (Model Context Protocol) gateway on top of that unified interface.

LangDB publishes 6 APIs on the APIs.io network, including Analytics API, Chat API, Embeddings API, and 3 more. Tagged areas include Artificial Intelligence, LLM, AI Gateway, Routing, and Governance.

The LangDB catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

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

🌐 Visit website 📡 Source on GitHub

41.8/100 developing ▬ flat Agent 21/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumOpen⚡ Free to try

1 APIs

Artificial Intelligence LLM AI Gateway Routing Governance MCP

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 41.8/100 · developing

Contract Quality 14.4 / 23

Developer Ergonomics 5.4 / 18

Access Clarity 7.1 / 18

Operational Transparency 4.0 / 12

Contract Governance 1.2 / 11

Discoverability 6.2 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/langdb: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 6

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

LangDB Analytics API

Usage analytics and cost summaries.

LangDB Chat API

OpenAI-compatible chat completions and model routing.

LangDB Embeddings API

Vector embeddings for input text.

LangDB Images API

Image generation.

LangDB Models API

Catalog of models available through the gateway.

LangDB Threads API

Conversation threads, their messages, and per-thread cost.

Open Collections 8

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

LangDB AI Gateway Analytics API

OPEN COLLECTION

LangDB AI Gateway Analytics Chat API

OPEN COLLECTION

LangDB AI Gateway Analytics Embeddings API

OPEN COLLECTION

LangDB AI Gateway Analytics Images API

OPEN COLLECTION

LangDB AI Gateway Analytics Models API

OPEN COLLECTION

LangDB AI Gateway Analytics Threads API

OPEN COLLECTION

LangDB AI Gateway API

OPEN COLLECTION

Scroll for all 8

Pricing Plans 1

Published pricing tiers and plan structures.

Langdb Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Langdb Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Langdb Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

LangDB Chat Completions Streaming (HTTP + SSE)

AsyncAPI 2.6 description of LangDB's **chat completion streaming** surface. LangDB does not publish a WebSocket API for chat. The asynchronous / event-style transport documented...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

LangDB API Rules

5 rules · 1 errors 4 warnings

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Langdb Authentication

http · 1 scheme

SECURITY

Langdb Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Langdb Agentic Access

10 operations · 7 acting

AGENTIC

Resources

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: langdb
url: https://raw.githubusercontent.com/api-evangelist/langdb/refs/heads/main/apis.yml
name: LangDB
kind: company
description: LangDB is an AI gateway and governance platform that routes requests across 250+ models from providers such as
  OpenAI, Anthropic, Google, Meta, Mistral, and DeepSeek through a single project-scoped, OpenAI-compatible REST API. It layers
  routing, guardrails, tracing, cost control, and an MCP (Model Context Protocol) gateway on top of that unified interface.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: open
  trial: false
  try_now: true
  public: true
  label: Freemium · Open access
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/langdb.png
tags:
- Artificial Intelligence
- LLM
- AI Gateway
- Routing
- Governance
- MCP
tags_raw:
- AI
- LLM
- AI Gateway
- Routing
- Governance
- MCP
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.23'
apis:
- aid: langdb:langdb-analytics-api
  name: LangDB Analytics API
  description: Usage analytics and cost summaries.
  humanURL: https://docs.langdb.ai/api-reference/ai-gateway-api/
  baseURL: https://api.us-east-1.langdb.ai/{project_id}/v1
  tags:
  - Analytics
  properties:
  - type: OpenAPI
    url: openapi/langdb-analytics-api-openapi.yml
  - type: Documentation
    url: https://docs.langdb.ai/getting-started/working-with-api/
  - type: APIReference
    url: https://docs.langdb.ai/api-reference/ai-gateway-api/
  - type: Postman
    url: collections/langdb.postman_collection.json
  - type: AsyncAPI
    url: asyncapi/langdb-asyncapi.yml
  - type: Documentation
    url: https://docs.langdb.ai/concepts/thread
  - type: Documentation
    url: https://docs.langdb.ai/features/usage
  - type: Documentation
    url: https://docs.langdb.ai/features/mcp-support
  - type: Documentation
    url: https://docs.langdb.ai/concepts/virtual-mcp-servers/
- aid: langdb:langdb-chat-api
  name: LangDB Chat API
  description: OpenAI-compatible chat completions and model routing.
  humanURL: https://docs.langdb.ai/api-reference/ai-gateway-api/
  baseURL: https://api.us-east-1.langdb.ai/{project_id}/v1
  tags:
  - Chat
  properties:
  - type: OpenAPI
    url: openapi/langdb-chat-api-openapi.yml
  - type: Documentation
    url: https://docs.langdb.ai/getting-started/working-with-api/
  - type: APIReference
    url: https://docs.langdb.ai/api-reference/ai-gateway-api/
  - type: Postman
    url: collections/langdb.postman_collection.json
  - type: AsyncAPI
    url: asyncapi/langdb-asyncapi.yml
  - type: Documentation
    url: https://docs.langdb.ai/concepts/thread
  - type: Documentation
    url: https://docs.langdb.ai/features/usage
  - type: Documentation
    url: https://docs.langdb.ai/features/mcp-support
  - type: Documentation
    url: https://docs.langdb.ai/concepts/virtual-mcp-servers/
- aid: langdb:langdb-embeddings-api
  name: LangDB Embeddings API
  description: Vector embeddings for input text.
  humanURL: https://docs.langdb.ai/api-reference/ai-gateway-api/
  baseURL: https://api.us-east-1.langdb.ai/{project_id}/v1
  tags:
  - Embeddings
  properties:
  - type: OpenAPI
    url: openapi/langdb-embeddings-api-openapi.yml
  - type: Documentation
    url: https://docs.langdb.ai/getting-started/working-with-api/
  - type: APIReference
    url: https://docs.langdb.ai/api-reference/ai-gateway-api/
  - type: Postman
    url: collections/langdb.postman_collection.json
  - type: AsyncAPI
    url: asyncapi/langdb-asyncapi.yml
  - type: Documentation
    url: https://docs.langdb.ai/concepts/thread
  - type: Documentation
    url: https://docs.langdb.ai/features/usage
  - type: Documentation
    url: https://docs.langdb.ai/features/mcp-support
  - type: Documentation
    url: https://docs.langdb.ai/concepts/virtual-mcp-servers/
- aid: langdb:langdb-images-api
  name: LangDB Images API
  description: Image generation.
  humanURL: https://docs.langdb.ai/api-reference/ai-gateway-api/
  baseURL: https://api.us-east-1.langdb.ai/{project_id}/v1
  tags:
  - Image
  tags_raw:
  - Images
  properties:
  - type: OpenAPI
    url: openapi/langdb-images-api-openapi.yml
  - type: Documentation
    url: https://docs.langdb.ai/getting-started/working-with-api/
  - type: APIReference
    url: https://docs.langdb.ai/api-reference/ai-gateway-api/
  - type: Postman
    url: collections/langdb.postman_collection.json
  - type: AsyncAPI
    url: asyncapi/langdb-asyncapi.yml
  - type: Documentation
    url: https://docs.langdb.ai/concepts/thread
  - type: Documentation
    url: https://docs.langdb.ai/features/usage
  - type: Documentation
    url: https://docs.langdb.ai/features/mcp-support
  - type: Documentation
    url: https://docs.langdb.ai/concepts/virtual-mcp-servers/
- aid: langdb:langdb-models-api
  name: LangDB Models API
  description: Catalog of models available through the gateway.
  humanURL: https://docs.langdb.ai/api-reference/ai-gateway-api/
  baseURL: https://api.us-east-1.langdb.ai/{project_id}/v1
  tags:
  - Models
  properties:
  - type: OpenAPI
    url: openapi/langdb-models-api-openapi.yml
  - type: Documentation
    url: https://docs.langdb.ai/getting-started/working-with-api/
  - type: APIReference
    url: https://docs.langdb.ai/api-reference/ai-gateway-api/
  - type: Postman
    url: collections/langdb.postman_collection.json
  - type: AsyncAPI
    url: asyncapi/langdb-asyncapi.yml
  - type: Documentation
    url: https://docs.langdb.ai/concepts/thread
  - type: Documentation
    url: https://docs.langdb.ai/features/usage
  - type: Documentation
    url: https://docs.langdb.ai/features/mcp-support
  - type: Documentation
    url: https://docs.langdb.ai/concepts/virtual-mcp-servers/
- aid: langdb:langdb-threads-api
  name: LangDB Threads API
  description: Conversation threads, their messages, and per-thread cost.
  humanURL: https://docs.langdb.ai/api-reference/ai-gateway-api/
  baseURL: https://api.us-east-1.langdb.ai/{project_id}/v1
  tags:
  - Threads
  properties:
  - type: OpenAPI
    url: openapi/langdb-threads-api-openapi.yml
  - type: Documentation
    url: https://docs.langdb.ai/getting-started/working-with-api/
  - type: APIReference
    url: https://docs.langdb.ai/api-reference/ai-gateway-api/
  - type: Postman
    url: collections/langdb.postman_collection.json
  - type: AsyncAPI
    url: asyncapi/langdb-asyncapi.yml
  - type: Documentation
    url: https://docs.langdb.ai/concepts/thread
  - type: Documentation
    url: https://docs.langdb.ai/features/usage
  - type: Documentation
    url: https://docs.langdb.ai/features/mcp-support
  - type: Documentation
    url: https://docs.langdb.ai/concepts/virtual-mcp-servers/
common:
- type: AgenticAccess
  url: agentic-access/langdb-agentic-access.yml
- type: DomainSecurity
  url: security/langdb-domain-security.yml
- type: Authentication
  url: authentication/langdb-authentication.yml
- type: GitHubOrganization
  url: https://github.com/langdb
- type: LinkedIn
  url: https://www.linkedin.com/company/langdb
- type: Website
  url: https://langdb.ai
- type: Documentation
  url: https://docs.langdb.ai
- type: Plans
  url: plans/langdb-plans-pricing.yml
- type: RateLimits
  url: rate-limits/langdb-rate-limits.yml
- type: FinOps
  url: finops/langdb-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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