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.

7 APIs 0 Features

AILLMAI GatewayRoutingGovernanceMCP

APIs

LangDB Chat Completions / Routing API

OpenAI-compatible chat completions routed across 250+ models from OpenAI, Anthropic, Google, Meta, Mistral, and DeepSeek, with SSE streaming, tool calling, structured outputs, f...

LangDB Embeddings API

OpenAI-compatible embeddings endpoint that creates vector representations of input text or token arrays via any embedding model routed through the gateway.

LangDB Images API

OpenAI-compatible image generation endpoint producing images from text prompts using image-capable models routed through the gateway.

LangDB Models API

Lists the models available to a project through the gateway in an OpenAI-compatible shape, spanning 250+ models across the supported providers.

LangDB Threads / Messages API

Retrieves the ordered messages and aggregated per-thread cost for a conversation thread, grouped by the X-Thread-Id supplied on chat requests.

LangDB Analytics / Usage API

Returns time-series analytics, aggregated summaries, total usage, and per-model usage (cost and token counts) for a project over preset reporting windows.

LangDB MCP Gateway API

Attaches virtual and custom MCP servers (over SSE or WebSocket transport) to chat requests via the mcp_servers array, exposing their tools to the routed model and bundling multi...

Event Specifications

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

Resources

👥

GitHubOrganization

Sources

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.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- AI
- LLM
- AI Gateway
- Routing
- Governance
- MCP
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.19'
apis:
- aid: langdb:langdb-chat-completions-api
  name: LangDB Chat Completions / Routing API
  tags:
  - Chat
  - Completions
  - Routing
  - LLM
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.langdb.ai/api-reference/ai-gateway-api/
  baseURL: https://api.us-east-1.langdb.ai/{project_id}/v1
  properties:
  - url: https://docs.langdb.ai/getting-started/working-with-api/
    type: Documentation
  - url: https://docs.langdb.ai/api-reference/ai-gateway-api/
    type: APIReference
  - url: openapi/langdb-openapi.yml
    type: OpenAPI
  - url: collections/langdb.postman_collection.json
    type: Postman
  - url: asyncapi/langdb-asyncapi.yml
    type: AsyncAPI
  description: OpenAI-compatible chat completions routed across 250+ models from OpenAI,
    Anthropic, Google, Meta, Mistral, and DeepSeek, with SSE streaming, tool calling,
    structured outputs, fallback/load-balancing routing, and attachable MCP servers.
- aid: langdb:langdb-embeddings-api
  name: LangDB Embeddings API
  tags:
  - Embeddings
  - Vectors
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.langdb.ai/api-reference/ai-gateway-api/
  baseURL: https://api.us-east-1.langdb.ai/{project_id}/v1
  properties:
  - url: https://docs.langdb.ai/api-reference/ai-gateway-api/
    type: APIReference
  - url: openapi/langdb-openapi.yml
    type: OpenAPI
  - url: collections/langdb.postman_collection.json
    type: Postman
  description: OpenAI-compatible embeddings endpoint that creates vector representations
    of input text or token arrays via any embedding model routed through the gateway.
- aid: langdb:langdb-images-api
  name: LangDB Images API
  tags:
  - Images
  - Generation
  - Multimodal
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.langdb.ai/api-reference/ai-gateway-api/
  baseURL: https://api.us-east-1.langdb.ai/{project_id}/v1
  properties:
  - url: https://docs.langdb.ai/api-reference/ai-gateway-api/
    type: APIReference
  - url: openapi/langdb-openapi.yml
    type: OpenAPI
  - url: collections/langdb.postman_collection.json
    type: Postman
  description: OpenAI-compatible image generation endpoint producing images from text
    prompts using image-capable models routed through the gateway.
- aid: langdb:langdb-models-api
  name: LangDB Models API
  tags:
  - Models
  - Catalog
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.langdb.ai/api-reference/ai-gateway-api/
  baseURL: https://api.us-east-1.langdb.ai/{project_id}/v1
  properties:
  - url: https://docs.langdb.ai/api-reference/ai-gateway-api/
    type: APIReference
  - url: openapi/langdb-openapi.yml
    type: OpenAPI
  - url: collections/langdb.postman_collection.json
    type: Postman
  description: Lists the models available to a project through the gateway in an OpenAI-compatible
    shape, spanning 250+ models across the supported providers.
- aid: langdb:langdb-threads-messages-api
  name: LangDB Threads / Messages API
  tags:
  - Threads
  - Messages
  - Observability
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.langdb.ai/concepts/thread
  baseURL: https://api.us-east-1.langdb.ai
  properties:
  - url: https://docs.langdb.ai/concepts/thread
    type: Documentation
  - url: https://docs.langdb.ai/api-reference/ai-gateway-api/
    type: APIReference
  - url: openapi/langdb-openapi.yml
    type: OpenAPI
  - url: collections/langdb.postman_collection.json
    type: Postman
  description: Retrieves the ordered messages and aggregated per-thread cost for a
    conversation thread, grouped by the X-Thread-Id supplied on chat requests.
- aid: langdb:langdb-analytics-api
  name: LangDB Analytics / Usage API
  tags:
  - Analytics
  - Usage
  - Cost
  - FinOps
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.langdb.ai/features/usage
  baseURL: https://api.us-east-1.langdb.ai
  properties:
  - url: https://docs.langdb.ai/features/usage
    type: Documentation
  - url: https://docs.langdb.ai/api-reference/ai-gateway-api/
    type: APIReference
  - url: openapi/langdb-openapi.yml
    type: OpenAPI
  - url: collections/langdb.postman_collection.json
    type: Postman
  description: Returns time-series analytics, aggregated summaries, total usage, and
    per-model usage (cost and token counts) for a project over preset reporting windows.
- aid: langdb:langdb-mcp-gateway-api
  name: LangDB MCP Gateway API
  tags:
  - MCP
  - Tools
  - Gateway
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.langdb.ai/features/mcp-support
  baseURL: https://api.us-east-1.langdb.ai/{project_id}/v1
  properties:
  - url: https://docs.langdb.ai/features/mcp-support
    type: Documentation
  - url: https://docs.langdb.ai/concepts/virtual-mcp-servers/
    type: Documentation
  - url: openapi/langdb-openapi.yml
    type: OpenAPI
  description: Attaches virtual and custom MCP servers (over SSE or WebSocket transport)
    to chat requests via the mcp_servers array, exposing their tools to the routed
    model and bundling multiple tools behind a single MCP URL.
common:
- 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