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 API contracts indexed on the APIs.io network, including Analytics API, Embeddings API, Images 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 pricing, authentication, documentation, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

35.9/100 thin ▬ flat Agent 20/100 agent aware Front door AI 6/6 dominant Heartbeat 13/100 dormant saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Artificial Intelligence LLM AI Gateway Routing Governance MCP Real-Time

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Information & Data Management

BC-610

ChatEmbeddings

POST /embeddings

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 35.9/100 · thin

Contract Quality 10.9 / 19

Developer Ergonomics 4.5 / 15

Access Clarity 5.5 / 15

Operational Transparency 1.0 / 10

Contract Governance 1.0 / 9

Discoverability 5.0 / 8

Regulatory Posture 1.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · 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

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 29.8 — up to +14.0 composite points
Access Clarity scores 36.8 — up to +12.6 composite points
Operational Transparency scores 10.5 — up to +11.6 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/langdb/apis.yml: open an issue on github.com/api-evangelist/langdb to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 3

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.

Model Context Protocol (MCP)

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

The OpenAI Interface reaches extended

declared — publishes a spec that declares them

2 core of 338 operations graded · api-commons/models

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

LangDB Analytics API

Usage analytics and cost summaries.

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.

LangDB Chat Completions API

OpenAI-compatible chat completions and model routing.

Open Collections 7

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

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 7

LangDB API pricing

Prices published by LangDB, read 2026-10-07 from langdb.ai/pricing/.

Plan	Price
Free	$0/month Includes: Access to 250+ models, 1 Project, 2k logs / month, 7-day data retention, Tracing and debugging, Obse
Professional	$49/month Includes: All features in Free, 2 Projects, 20k logs / month, BYO LLM keys, Project level Cost Control, Basic
Business	$199/month Includes: All features in Professional, Unlimited Projects, 200k logs / month, 90-day data retention, LLM + Pa
Enterprise	Custom Includes: All features in Business, Private VPC deployment, Private ClickHouse cloud, Unlimited data retention

Plan details, limits and sources →

Rate limits

Requests Per Minute (RPM): see provider documentation requests
Tokens Per Minute (TPM): see provider documentation tokens
Per-User Spend Limit: configurable cost

Compiled by API Evangelist, not yet checked against LangDB's documentation. All 5 limits →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

LangDB

SLA

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 — asyncapi 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 · 3 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 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

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: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/langdb.png
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
tags:
- Artificial Intelligence
- LLM
- AI Gateway
- Routing
- Governance
- MCP
- Real-Time
tags_raw:
- AI
- LLM
- AI Gateway
- Routing
- Governance
- MCP
- Real-Time
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-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/
- aid: langdb:langdb-chat-completions-api
  name: LangDB Chat Completions 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 Completions
  properties:
  - type: OpenAPI
    url: openapi/langdb-chat-completions-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: Pricing
  url: https://langdb.ai/pricing/
- type: CapabilityMap
  url: capabilities/langdb-capability-edges.yml
  name: LangDB Business Capability Map
- 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

LangDB API — frequently asked questions

Does LangDB have an API?

Yes. APIs.io lists 6 APIs from LangDB, including LangDB Analytics API, LangDB Embeddings API and LangDB Images API, and 3 more.

Is there an OpenAPI specification for the LangDB API?

Yes. APIs.io indexes 6 OpenAPI specifications for LangDB, each linked for download from this page.

How do I authenticate with the LangDB API?

LangDB uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Langdb Authentication.

How much does the LangDB API cost?

LangDB publishes its prices; its Free plan is $0/month as of 2026-10-07. APIs.io lists 4 pricing plans for LangDB, with each plan's price, limits and inclusions under Pricing on this page.

Is the LangDB API ready for AI agents?

LangDB has a Kin Score of 35.9 out of 100 (thin) and an Agent Readiness score of 20.0 (agent-aware), scored by API Evangelist on 2026-11-06.

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