DuckDuckGo

DuckDuckGo is an independent online-privacy company best known for its tracker-free search engine and the DuckDuckGo Browser (iOS, Android, macOS, Windows). It operates the public Instant Answer API at api.duckduckgo.com (free, JSON/XML), the Duck.ai anonymous AI-chat proxy at duck.ai (routes to Anthropic Claude, OpenAI GPT, Meta Llama, Mistral models without storing or training on prompts), the Tracker Radar open dataset (CC BY-NC-SA), Email Protection (@duck.com forwarding addresses), and Privacy Pro (VPN + Personal Information Removal + Identity Theft Restoration).

DuckDuckGo publishes 4 APIs on the APIs.io network, including Instant Answers API, and 3 more. Tagged areas include Search, Privacy, Browser, AI Chat, and Email Protection.

The DuckDuckGo catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

DuckDuckGo’s developer surface includes developer portal, engineering blog, and 19 more developer resources.

🌐 Visit website 📡 Source on GitHub

46.8/100 developing ▬ flat Agent 24/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

AccessFreemium

1 APIs

Search Privacy Browser AI ChatEmail ProtectionVPN Trackers Identity

Kin Score

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

Composite quality — 46.8/100 · developing

Contract Quality 12.3 / 21

Developer Ergonomics 3.6 / 17

Access Clarity 9.8 / 17

Operational Transparency 5.2 / 11

Contract Governance 2.8 / 10

Discoverability 5.5 / 9

Regulatory Posture 3.1 / 15

Agent readiness — 24/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 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 4 / 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.

Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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/duckduckgo: 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 4

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

Duck.ai Anonymous AI Chat

Duck.ai is DuckDuckGo's anonymizing proxy in front of third-party LLMs. Free tier currently includes Anthropic Claude 4.5 Haiku, Meta Llama 4 Scout, Mistral Small 3 24B, OpenAI ...

DuckDuckGo Tracker Radar Dataset

Tracker Radar is the open dataset that powers DuckDuckGo's tracker and fingerprinting protection. It is a JSON corpus of the most common third-party domains on the web, with met...

DuckDuckGo !Bang Redirector

The !bang system - in place since 2008 and now spanning thousands of destinations - lets a query like "!w filter bubble" 302-redirect to the destination site's own search (Wikip...

DuckDuckGo Instant Answers API

Zero-click answers, abstracts, definitions and disambiguations.

Open Collections 3

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

API Collection

OPEN COLLECTION

DuckDuckGo Instant Answer Bangs API

OPEN COLLECTION

DuckDuckGo Instant Answer Instant Answers API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Duckduckgo Plans Pricing

6 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Duckduckgo Rate Limits

3 limits

RATE LIMITS

FinOps 1

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

Duckduckgo Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Duckduckgo Context

22 classes · 5 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

DuckDuckGo API Rules

5 rules · 3 warnings 2 info

SPECTRAL

DuckDuckGo API Rules

7 rules · 4 errors 3 warnings

SPECTRAL

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

DuckDuckGo Instant Answer Response

21 properties

JSON SCHEMA

DuckDuckGo Tracker Radar Domain Record

14 properties

JSON SCHEMA

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Instant Answer Response Structure

0 properties

JSON STRUCTURE

Examples 4

Example request and response payloads for these APIs.

Instant Answer Bang Example

2 fields

EXAMPLE

Instant Answer Calc Example

2 fields

EXAMPLE

Instant Answer Topic Example

2 fields

EXAMPLE

Tracker Radar Domain Example

14 fields

EXAMPLE

Security Posture 2

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

Duckduckgo Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Duckduckgo Vulnerability Disclosure

disclosure policy published

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LlmsText

LlmsText

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Vocabulary

Vocabulary

JSONLD

JSONLD

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

SourceCode

SourceCode

Access & Security 2

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

Releases

Releases

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

PrivacyPro

PrivacyPolicy

Plans

FinOps

Company 3

The organization behind the API

Website

Website

Blog

Blog

BlogRSS

BlogRSS

Other 3

Properties that don't map to a standard resource type

DuckDuckGo Browser

Browser

Duck.ai

AIChat

EmailProtection

EmailProtection

Source (apis.yml)

aid: duckduckgo
url: https://raw.githubusercontent.com/api-evangelist/duckduckgo/refs/heads/main/apis.yml
name: DuckDuckGo
kind: company
description: DuckDuckGo is an independent online-privacy company best known for its tracker-free search engine and the DuckDuckGo
  Browser (iOS, Android, macOS, Windows). It operates the public Instant Answer API at api.duckduckgo.com (free, JSON/XML),
  the Duck.ai anonymous AI-chat proxy at duck.ai (routes to Anthropic Claude, OpenAI GPT, Meta Llama, Mistral models without
  storing or training on prompts), the Tracker Radar open dataset (CC BY-NC-SA), Email Protection (@duck.com forwarding addresses),
  and Privacy Pro (VPN + Personal Information Removal + Identity Theft Restoration).
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - duckduckgo/tracker-radar
  open_source: unknown
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - openapi
  - pricing
  - repository-not-product
  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/duckduckgo.png
tags:
- Search
- Privacy
- Browser
- AI Chat
- Email Protection
- VPN
- Trackers
- Identity
created: '2026-05-23'
modified: '2026-05-23'
specificationVersion: '0.23'
apis:
- aid: duckduckgo:duck-ai
  name: Duck.ai Anonymous AI Chat
  humanURL: https://duck.ai/
  baseURL: https://duck.ai
  tags:
  - AI Chat
  - LLM Proxy
  - Privacy
  - Anonymous
  description: Duck.ai is DuckDuckGo's anonymizing proxy in front of third-party LLMs. Free tier currently includes Anthropic
    Claude 4.5 Haiku, Meta Llama 4 Scout, Mistral Small 3 24B, OpenAI GPT-4o mini / GPT-5 mini / gpt-oss-120b. Duck.ai Plus
    adds GPT-4o, GPT-5.2, Claude Sonnet 4.5, Llama 4 Maverick. Duck.ai Pro adds Claude Opus 4.6, higher reasoning effort and
    2x usage limits. DuckDuckGo strips IP / identifiers before forwarding to upstream model providers and does not retain
    prompts or train on them. There is no public REST API; access is via the web UI and the in-browser integration in DuckDuckGo
    Browser.
  properties:
  - type: Documentation
    url: https://duckduckgo.com/duckduckgo-help-pages/duckai/
  - type: Portal
    url: https://duck.ai/
  - type: Pricing
    url: plans/duckduckgo-plans-pricing.yml
- aid: duckduckgo:tracker-radar
  name: DuckDuckGo Tracker Radar Dataset
  humanURL: https://github.com/duckduckgo/tracker-radar
  baseURL: https://raw.githubusercontent.com/duckduckgo/tracker-radar/main/
  tags:
  - Trackers
  - Open Data
  - Privacy Dataset
  - JSON
  description: Tracker Radar is the open dataset that powers DuckDuckGo's tracker and fingerprinting protection. It is a JSON
    corpus of the most common third-party domains on the web, with metadata covering behavior, classification, ownership,
    prevalence, fingerprinting, cookies, privacy policies, and performance. Distributed under Creative Commons BY-NC-SA 4.0
    (commercial licensing available on request). Files are addressable as raw JSON under /domains in the GitHub repo, so it
    is consumable as a static read-only "data API" over HTTPS.
  properties:
  - type: SourceCode
    url: https://github.com/duckduckgo/tracker-radar
  - type: License
    url: https://creativecommons.org/licenses/by-nc-sa/4.0/
  - type: JSONSchema
    url: json-schema/tracker-radar-domain-schema.json
  - type: Examples
    url: examples/tracker-radar-domain-example.json
- aid: duckduckgo:bang-redirector
  name: DuckDuckGo !Bang Redirector
  humanURL: https://duckduckgo.com/bangs
  tags:
  - Search
  - Redirect
  - Bang
  description: The !bang system - in place since 2008 and now spanning thousands of destinations - lets a query like "!w filter
    bubble" 302-redirect to the destination site's own search (Wikipedia in that example). When called via the Instant Answer
    API, a bang query returns a Redirect field with the target URL rather than performing the redirect, so it can be used
    programmatically as a normalized "search-on-other-site" router.
  properties:
  - type: Documentation
    url: https://duckduckgo.com/bangs
  - type: Submission
    url: https://duckduckgo.com/newbang
- aid: duckduckgo:duckduckgo-instant-answers-api
  name: DuckDuckGo Instant Answers API
  description: Zero-click answers, abstracts, definitions and disambiguations.
  humanURL: https://duckduckgo.com/api
  baseURL: https://api.duckduckgo.com
  tags:
  - Instant Answers
  properties:
  - type: OpenAPI
    url: openapi/duckduckgo-instant-answers-api-openapi.yml
  - type: Documentation
    url: https://duckduckgo.com/api
  - type: Examples
    url: examples/
  - type: SpectralRules
    url: rules/instant-answer-rules.yml
  - type: JSONSchema
    url: json-schema/instant-answer-response-schema.json
  - type: JSONLD
    url: json-ld/duckduckgo-context.jsonld
  - type: Pricing
    url: https://duckduckgo.com/api
common:
- type: IssueTracker
  url: https://github.com/duckduckgo/tracker-radar/issues
- type: Releases
  url: https://github.com/duckduckgo/tracker-radar/releases
- type: VulnerabilityDisclosure
  url: security/duckduckgo-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/duckduckgo-domain-security.yml
- type: Website
  url: https://duckduckgo.com/
- type: Portal
  url: https://duckduckgo.com/duckduckgo-help-pages/
- type: Blog
  url: https://spreadprivacy.com/
- type: BlogRSS
  url: https://spreadprivacy.com/rss/
- type: GitHubOrganization
  url: https://github.com/duckduckgo
- type: SourceCode
  url: https://github.com/duckduckgo
- type: Browser
  title: DuckDuckGo Browser
  url: https://duckduckgo.com/app
- type: AIChat
  title: Duck.ai
  url: https://duck.ai/
- type: EmailProtection
  url: https://duckduckgo.com/email/
- type: PrivacyPro
  url: https://duckduckgo.com/privacy-pro
- type: PrivacyPolicy
  url: https://duckduckgo.com/privacy
- type: Plans
  url: plans/duckduckgo-plans-pricing.yml
- type: RateLimits
  url: rate-limits/duckduckgo-rate-limits.yml
- type: FinOps
  url: finops/duckduckgo-finops.yml
- type: Vocabulary
  url: vocabulary/duckduckgo-vocabulary.yml
- type: JSONLD
  url: json-ld/duckduckgo-context.jsonld
- type: LlmsText
  url: https://duck.ai/llms.txt
integrations:
- name: Apple Safari Intelligent Tracking Prevention (uses tracker data feeds)
- name: Mozilla Firefox (DuckDuckGo as default search option)
- name: Brave Browser (DuckDuckGo selectable as default search)
- name: Tor Browser (DuckDuckGo as default search)
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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