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 API contracts indexed 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 📡 Profile data on GitHub

39.8/100 developing ▬ flat Agent 21/100 agent aware Front door AI 1/6 silent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 published contract

Search Privacy Browser AI ChatEmail ProtectionVPN Trackers Identity

Kin Score

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

Composite quality — 39.8/100 · developing

Contract Quality 12.3 / 21

Developer Ergonomics 3.6 / 17

Access Clarity 4.9 / 17

Operational Transparency 4.1 / 11

Contract Governance 2.8 / 10

Discoverability 5.5 / 9

Regulatory Posture 3.1 / 15

Agent readiness — 21/100 · 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

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 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/.

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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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 21.4 — up to +15.7 composite points
Access Clarity scores 28.9 — up to +14.2 composite points
Contract Quality scores 57.8 — up to +10.6 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/duckduckgo/apis.yml: open an issue on github.com/api-evangelist/duckduckgo 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Browser Extension Stores (company-published Firefox add-ons; Chrome Web Store unreadable)	builds-on	19.7 (thin)	-	1
Obsidian Community Plugins (third-party APIs the Obsidian plugin ecosystem integrates)	builds-on	19.7 (thin)	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

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.

VPN

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

OpenAPI

measured — observed by APIs.io (published)

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 2

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

DuckDuckGo Instant Answer Bangs API

OPEN COLLECTION

DuckDuckGo Instant Answer Instant Answers API

OPEN COLLECTION

DuckDuckGo API pricing

Not yet checked against DuckDuckGo's own pricing page. Compiled by API Evangelist from duckduckgo.com/api; confirm before you rely on a figure.

Plan	Price
Instant Answer API	—
Duck.ai (Free)	—
Duck.ai Plus	—
Duck.ai Pro	—
Privacy Pro	—
Email Protection	—

Plan details, limits and sources →

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

Service Levels 1

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

DuckDuckGo

SLA

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 — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

DuckDuckGo — instant answer 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

no policy recorded

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: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  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

DuckDuckGo API — frequently asked questions

Does DuckDuckGo have an API?

Yes. APIs.io lists 4 APIs from DuckDuckGo, including Duck.ai Anonymous AI Chat, DuckDuckGo Tracker Radar Dataset and DuckDuckGo !Bang Redirector, and 1 more.

Is there an OpenAPI specification for the DuckDuckGo API?

Yes. APIs.io indexes 1 OpenAPI specification for DuckDuckGo, each linked for download from this page.

How much does the DuckDuckGo API cost?

APIs.io lists 6 pricing plans for DuckDuckGo, with each plan's price, limits and inclusions under Pricing on this page.

Is the DuckDuckGo API ready for AI agents?

DuckDuckGo has a Kin Score of 39.8 out of 100 (developing) and an Agent Readiness score of 20.7 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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