Papago

Naver Papago translation REST API for translating text between Korean, English, Japanese, Chinese, and other Asian and European languages using Neural Machine Translation (NMT) algorithms. The service offers text translation, document translation, website translation, language detection, and glossary management, supporting 29 language pairs with high accuracy and no data retention for user privacy.

Papago publishes 5 API contracts indexed on the APIs.io network. Tagged areas include Translation, Natural Language Processing, Machine Translation, Neural Machine Translation, and Korean.

The Papago catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Papago’s developer surface includes authentication, documentation, engineering blog, pricing, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

32.7/100 thin ▬ flat Agent 27/100 agent aware Front door AI 5/6 prominent Heartbeat 55/100 slowing 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

Translation Natural Language Processing Machine TranslationNeural Machine TranslationKoreanAsian LanguagesLocalization Language Detection

Kin Score

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

Composite quality — 32.7/100 · thin

Contract Quality 9.9 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 2.8 / 15

Operational Transparency 2.8 / 10

Contract Governance 0.9 / 9

Discoverability 5.0 / 8

Regulatory Posture 2.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 27/100 · 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 8 / 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

Pagination 5 / 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)
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
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

8 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 18.4 — up to +16.3 composite points
Developer Ergonomics scores 23.8 — up to +15.2 composite points
Contract Quality scores 52.6 — up to +11.9 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/papago/apis.yml: open an issue on github.com/api-evangelist/papago 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
Localization and Translation Management	undeclared	-	-	-

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 1

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 5

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

Papago Language Detection API

Automatically detects the language of input text, supporting 15 languages including Korean, English, Japanese, Chinese, Vietnamese, Thai, Indonesian, French, Spanish, Russian, G...

Papago Document Translation API

Translates documents while preserving their original layout, supporting MS Office formats (DOCX, PPTX, XLSX), PDF, and Korean Hangul (HWP v5.0+) files up to 100 MB and 300,000 c...

Papago Website Translation API

Detects and translates HTML documents and web elements using proprietary tag restoration technology for improved translation accuracy across websites and web applications, suppo...

Papago Glossary API

Manages custom terminology dictionaries for contextually appropriate translations. Allows registration and retrieval of glossaries with up to 20 terms per request, applied acros...

Papago API

Naver Machine Learning Translation APIs

Open Collections 1

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

Translation Papago API

OPEN COLLECTION

Papago API pricing

Not yet checked against Papago's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free Tier	Free
Pay-as-You-Go	—
Enterprise	—

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Plans

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

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.

Papago

SLA

FinOps 1

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

Finops

FINOPS

Semantic Vocabularies 1

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

context Context

3 classes · 17 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Papago — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 3

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

RomanizationResponse

1 properties

JSON SCHEMA

TranslationRequest

5 properties

JSON SCHEMA

TranslationResponse

1 properties

JSON SCHEMA

Examples 4

Example request and response payloads for these APIs.

Nmt Translation Request

4 fields

EXAMPLE

Nmt Translation Response

1 fields

EXAMPLE

Romanization Request

1 fields

EXAMPLE

Romanization Response

1 fields

EXAMPLE

Security Posture 2

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

Papago Authentication

apiKey · 2 schemes

SECURITY

Papago Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Papago Agentic Access

3 operations · 2 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

GitHubOrg

GitHubOrg

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: papago
name: Papago
description: Naver Papago translation REST API for translating text between Korean, English, Japanese, Chinese, and other
  Asian and European languages using Neural Machine Translation (NMT) algorithms. The service offers text translation, document
  translation, website translation, language detection, and glossary management, supporting 29 language pairs with high accuracy
  and no data retention for user privacy.
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/papago.png
url: https://raw.githubusercontent.com/api-evangelist/papago/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-09-16'
specificationVersion: '0.23'
tags:
- Translation
- Natural Language Processing
- Machine Translation
- Neural Machine Translation
- Korean
- Asian Languages
- Localization
- Language Detection
apis:
- aid: papago:papago-language-detection
  name: Papago Language Detection API
  description: Automatically detects the language of input text, supporting 15 languages including Korean, English, Japanese,
    Chinese, Vietnamese, Thai, Indonesian, French, Spanish, Russian, German, Italian, Portuguese, and Hindi. Language detection
    is provided at no charge.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://api.ncloud-docs.com/docs/en/ai-naver-papagonmt
  baseURL: https://papago.apigw.ntruss.com/langs/v1
  tags:
  - Language Detection
  - Natural Language Processing
  properties:
  - type: Documentation
    url: https://api.ncloud-docs.com/docs/en/ai-naver-papagonmt
  contact:
  - FN: Naver Cloud Platform Support
    url: https://www.ncloud.com/support/question
- aid: papago:papago-document-translation
  name: Papago Document Translation API
  description: Translates documents while preserving their original layout, supporting MS Office formats (DOCX, PPTX, XLSX),
    PDF, and Korean Hangul (HWP v5.0+) files up to 100 MB and 300,000 characters per document across 15 language pairs.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://api.ncloud-docs.com/docs/en/ai-naver-papagonmt
  baseURL: https://papago.apigw.ntruss.com/doc-trans/v1
  tags:
  - Document Translation
  - File Translation
  properties:
  - type: Documentation
    url: https://api.ncloud-docs.com/docs/en/ai-naver-papagonmt
  contact:
  - FN: Naver Cloud Platform Support
    url: https://www.ncloud.com/support/question
- aid: papago:papago-website-translation
  name: Papago Website Translation API
  description: Detects and translates HTML documents and web elements using proprietary tag restoration technology for improved
    translation accuracy across websites and web applications, supporting 15 language pairs.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://api.ncloud-docs.com/docs/en/ai-naver-papagonmt
  baseURL: https://papago.apigw.ntruss.com/web-trans/v1
  tags:
  - Website Translation
  - HTML Translation
  - Web Localization
  properties:
  - type: Documentation
    url: https://api.ncloud-docs.com/docs/en/ai-naver-papagonmt
  contact:
  - FN: Naver Cloud Platform Support
    url: https://www.ncloud.com/support/question
- aid: papago:papago-glossary
  name: Papago Glossary API
  description: Manages custom terminology dictionaries for contextually appropriate translations. Allows registration and
    retrieval of glossaries with up to 20 terms per request, applied across all Papago translation services for consistent
    domain-specific terminology.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://api.ncloud-docs.com/docs/en/ai-naver-papagonmt
  baseURL: https://papago.apigw.ntruss.com/glossary
  tags:
  - Glossary
  - Terminology
  - Custom Dictionary
  properties:
  - type: Documentation
    url: https://api.ncloud-docs.com/docs/en/ai-naver-papagonmt
  contact:
  - FN: Naver Cloud Platform Support
    url: https://www.ncloud.com/support/question
- aid: papago:papago-papago-api
  name: Papago API
  description: Naver Machine Learning Translation APIs
  humanURL: https://api.ncloud-docs.com/docs/en/ai-naver-papagonmt
  baseURL: https://papago.apigw.ntruss.com/nmt/v1
  tags:
  - Papago
  properties:
  - type: OpenAPI
    url: openapi/papago-papago-api-openapi.yml
  - type: Documentation
    url: https://api.ncloud-docs.com/docs/en/ai-naver-papagonmt
common:
- type: AgenticAccess
  url: agentic-access/papago-agentic-access.yml
- type: DomainSecurity
  url: security/papago-domain-security.yml
- type: Authentication
  url: authentication/papago-authentication.yml
- type: Website
  url: https://www.ncloud.com/v2/product/aiService/papagoTranslation
- type: Documentation
  url: https://guide.ncloud-docs.com/docs/en/papagotranslation-overview
- type: GitHubOrg
  url: https://github.com/NaverCloudPlatform
- type: LinkedIn
  url: https://www.linkedin.com/company/navercloud
- type: Blog
  url: https://medium.com/naver-cloud
- type: Pricing
  url: https://www.ncloud.com/charge/calc
- type: StatusPage
  url: https://www.ncloud.com/v2/serviceStatus
- type: X
  url: https://x.com/NaverCloudPlatf
- type: Plans
  url: https://raw.githubusercontent.com/api-evangelist/papago/refs/heads/main/plans/plans.yml
- type: RateLimits
  url: https://raw.githubusercontent.com/api-evangelist/papago/refs/heads/main/rate-limits/rate-limits.yml
- type: FinOps
  url: https://raw.githubusercontent.com/api-evangelist/papago/refs/heads/main/finops/finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Papago API — frequently asked questions

Does Papago have an API?

Yes. APIs.io lists 5 APIs from Papago, including Papago Language Detection API, Papago Document Translation API and Papago Website Translation API, and 2 more.

Is there an OpenAPI specification for the Papago API?

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

How do I authenticate with the Papago API?

Papago uses bearer-token authentication (apiKey · 2 schemes). The details are profiled on APIs.io as Papago Authentication.

How much does the Papago API cost?

APIs.io lists 3 pricing plans for Papago, with each plan's price, limits and inclusions under Pricing on this page.

Is the Papago API ready for AI agents?

Papago has a Kin Score of 32.7 out of 100 (thin) and an Agent Readiness score of 27.1 (agent-aware), scored by API Evangelist on 2026-11-06.

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