DuckDB

DuckDB is an in-process, MIT-licensed analytical SQL database with no external dependencies. It runs as a library embedded in the host application (CLI, Python, Node.js, R, Java/JDBC, Go, Wasm, etc.) and does not expose a network REST API.

DuckDB publishes 1 API on the APIs.io network. Tagged areas include Database, Analytics, OLAP, Embedded, and Open Source.

DuckDB’s developer surface includes developer portal, engineering blog, and 15 more developer resources.

🌐 Visit website 📡 Source on GitHub

29.5/100 thin ▲ 6.0 Agent 1/100 human only Front door AI 3/6 light open core · MIT Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

AccessFreemium

1 APIs

Database Analytics OLAP Embedded Open Source

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 29.5/100 · thin

Contract Quality 0.0 / 19

Developer Ergonomics 5.7 / 15

Access Clarity 2.4 / 15

Operational Transparency 3.9 / 10

Contract Governance 0.0 / 9

Discoverability 5.5 / 8

Regulatory Posture 0.9 / 15

Open Source Surface 10.0 / 10

Agent readiness — 1/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 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

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.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 75 points between them, because both conditional facets apply and carry 25 points together. 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/.

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/duckdb: 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 1

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

DuckDB In-Process Library

DuckDB ships as a library with first-class bindings for Python, R, Java (JDBC), Node.js, C/C++, Go, Rust, Swift, Julia, and the browser via DuckDB-Wasm. There is no network REST...

Pricing Plans 1

Published pricing tiers and plan structures.

Duckdb Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Duckdb Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Duckdb Finops

FINOPS

Security Posture 1

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

Duckdb Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Documentation 1

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LlmsText

LlmsText

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

SourceCode

SourceCode

Access & Security 2

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

Releases

Releases

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Foundation

Foundation

MotherDuck (cloud DuckDB)

CommercialOffering

Source (apis.yml)

aid: duckdb
url: https://raw.githubusercontent.com/api-evangelist/duckdb/refs/heads/main/apis.yml
name: DuckDB
kind: opensource
description: DuckDB is an in-process, MIT-licensed analytical SQL database with no external dependencies. It runs as a library
  embedded in the host application (CLI, Python, Node.js, R, Java/JDBC, Go, Wasm, etc.) and does not expose a network REST
  API.
deliveryModel:
  model: open-core
  license: MIT
  license_evidence:
    repo: duckdb/duckdb
    spdx: MIT
    stars: 41701
  open_source: true
  commercial: true
  callable_host: false
  label: Open core · an OSS project plus a commercial hosted product
  confidence: medium
  source:
  - pricing
  - repository-license
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/duckdb.png
tags:
- Database
- Analytics
- OLAP
- Embedded
- Open Source
tags_raw:
- Database
- Analytics
- OLAP
- Embedded
- Open Source
- Open-Source
created: '2026-05-08'
modified: '2026-05-08'
specificationVersion: '0.23'
apis:
- aid: duckdb:duckdb-library
  name: DuckDB In-Process Library
  humanURL: https://duckdb.org/docs/
  baseURL: in-process (no network endpoint)
  tags:
  - Embedded
  - SQL
  - Library
  - Wasm
  description: DuckDB ships as a library with first-class bindings for Python, R, Java (JDBC), Node.js, C/C++, Go, Rust, Swift,
    Julia, and the browser via DuckDB-Wasm. There is no network REST API; clients call DuckDB in-process. Extensions like
    httpfs allow DuckDB itself to act as an HTTP/S3 client.
  properties:
  - type: Documentation
    url: https://duckdb.org/docs/
  - type: SourceCode
    url: https://github.com/duckdb/duckdb
  - type: License
    url: https://github.com/duckdb/duckdb/blob/main/LICENSE
  - type: SDKs
    title: Python
    url: https://duckdb.org/docs/api/python/overview
  - type: SDKs
    title: Node.js
    url: https://duckdb.org/docs/api/nodejs/overview
  - type: SDKs
    title: Wasm
    url: https://duckdb.org/docs/api/wasm/overview
common:
- type: IssueTracker
  url: https://github.com/duckdb/duckdb/issues
- type: Releases
  url: https://github.com/duckdb/duckdb/releases
- type: SecurityPolicy
  url: https://github.com/duckdb/duckdb/blob/main/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/duckdb/duckdb/blob/main/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/duckdb/duckdb/blob/main/CONTRIBUTING.md
- type: DomainSecurity
  url: security/duckdb-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/duckdb
- type: Website
  url: https://duckdb.org/
- type: Portal
  url: https://duckdb.org/docs/
- type: SourceCode
  url: https://github.com/duckdb/duckdb
- type: Foundation
  url: https://duckdb.org/foundation/
- type: CommercialOffering
  title: MotherDuck (cloud DuckDB)
  url: https://motherduck.com/
- type: Plans
  url: plans/duckdb-plans-pricing.yml
- type: RateLimits
  url: rate-limits/duckdb-rate-limits.yml
- type: FinOps
  url: finops/duckdb-finops.yml
- type: Blog
  url: https://duckdb.org/feed.xml
- type: Integrations
  url: https://duckdb.org/ecosystem/
- type: LlmsText
  url: https://duckdb.org/llms.txt
integrations:
- name: DuckDB Logo for Download
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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