Unbabel

Unbabel is a Language Operations (LangOps) platform that combines always-on AI translation with on-demand human review to localize customer support, marketing, and other business content at scale. Its long-standing developer surface is the Unbabel Translation API (tapi/v2, base https://api.unbabel.com/tapi/v2), an asynchronous REST API where callers submit text with a source/target language pair, tone, and topic, then retrieve the completed AI-plus-human translation by uid or via a callback. Unbabel also offers a pure machine-translation path (mt_translation) and helper resources for language pairs, tones, topics, word count, and account details. Unbabel has since launched the standalone LLM-based product Widn.AI (its own RESTful API at widn.ai) and, following its combination with TransPerfect, its research and models (TowerLLM, COMET, Widn.AI) now also feed the GlobalLink platform; the tapi/v2 Translation API remains the documented developer surface at developers.unbabel.com.

Unbabel publishes 6 APIs on the APIs.io network, including Account API, Language Pairs API, Machine Translation API, and 3 more. Tagged areas include Translation, Localization, Language Operations, LangOps, and Machine Translation.

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

🌐 Visit website 📡 Source on GitHub

41.9/100 thin ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1

AccessPaidSelf serve

6 APIs

TranslationLocalizationLanguage OperationsLangOpsMachine TranslationHuman in the LoopAI

Kin Score

Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1

Composite quality — 41.9/100 · thin

Contract Quality 15.9 / 25

Developer Ergonomics 4.3 / 20

Commercial Clarity 9.5 / 20

Operational Transparency 4.8 / 13

Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 31/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

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 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

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/unbabel: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 6

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

Rate Limits 1

Documented rate limits and quota policies.

Unbabel Rate Limits

3 limits

RATE LIMITS

FinOps 1

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

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 4

Authentication, authorization, and security posture

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

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

Source (apis.yml)

aid: unbabel
url: https://raw.githubusercontent.com/api-evangelist/unbabel/refs/heads/main/apis.yml
name: Unbabel
kind: company
description: Unbabel is a Language Operations (LangOps) platform that combines always-on AI translation with on-demand human
  review to localize customer support, marketing, and other business content at scale. Its long-standing developer surface
  is the Unbabel Translation API (tapi/v2, base https://api.unbabel.com/tapi/v2), an asynchronous REST API where callers submit
  text with a source/target language pair, tone, and topic, then retrieve the completed AI-plus-human translation by uid or
  via a callback. Unbabel also offers a pure machine-translation path (mt_translation) and helper resources for language pairs,
  tones, topics, word count, and account details. Unbabel has since launched the standalone LLM-based product Widn.AI (its
  own RESTful API at widn.ai) and, following its combination with TransPerfect, its research and models (TowerLLM, COMET,
  Widn.AI) now also feed the GlobalLink platform; the tapi/v2 Translation API remains the documented developer surface at
  developers.unbabel.com.
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/unbabel.png
tags:
- Translation
- Localization
- Language Operations
- LangOps
- Machine Translation
- Human in the Loop
- AI
created: '2026-07-03'
modified: '2026-07-03'
specificationVersion: '0.19'
apis:
- aid: unbabel:unbabel-account-api
  name: Unbabel Account API
  description: Authenticated customer account information.
  humanURL: https://developers.unbabel.com/docs/introduction
  baseURL: https://api.unbabel.com/tapi/v2
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/unbabel-account-api-openapi.yml
  - type: Documentation
    url: https://developers.unbabel.com/docs/introduction
  - type: APIReference
    url: https://developers.unbabel.com/reference/translation-list-update
  - type: PostmanCollection
    url: collections/unbabel.postman_collection.json
  - type: OpenCollection
    url: collections/unbabel.opencollection.json
  - type: APIReference
    url: https://developers.unbabel.com/reference/language-pair
  - type: APIReference
    url: https://developers.unbabel.com/reference/tone
  - type: APIReference
    url: https://developers.unbabel.com/reference/word-count
  - type: APIReference
    url: https://developers.unbabel.com/reference/account
- aid: unbabel:unbabel-language-pairs-api
  name: Unbabel Language Pairs API
  description: Supported source-to-target language combinations.
  humanURL: https://developers.unbabel.com/docs/introduction
  baseURL: https://api.unbabel.com/tapi/v2
  tags:
  - Language Pairs
  properties:
  - type: OpenAPI
    url: openapi/unbabel-language-pairs-api-openapi.yml
  - type: Documentation
    url: https://developers.unbabel.com/docs/introduction
  - type: APIReference
    url: https://developers.unbabel.com/reference/translation-list-update
  - type: PostmanCollection
    url: collections/unbabel.postman_collection.json
  - type: OpenCollection
    url: collections/unbabel.opencollection.json
  - type: APIReference
    url: https://developers.unbabel.com/reference/language-pair
  - type: APIReference
    url: https://developers.unbabel.com/reference/tone
  - type: APIReference
    url: https://developers.unbabel.com/reference/word-count
  - type: APIReference
    url: https://developers.unbabel.com/reference/account
- aid: unbabel:unbabel-machine-translation-api
  name: Unbabel Machine Translation API
  description: Pure machine-translation jobs, optionally upgradeable to human review.
  humanURL: https://developers.unbabel.com/docs/introduction
  baseURL: https://api.unbabel.com/tapi/v2
  tags:
  - Machine Translation
  properties:
  - type: OpenAPI
    url: openapi/unbabel-machine-translation-api-openapi.yml
  - type: Documentation
    url: https://developers.unbabel.com/docs/introduction
  - type: APIReference
    url: https://developers.unbabel.com/reference/translation-list-update
  - type: PostmanCollection
    url: collections/unbabel.postman_collection.json
  - type: OpenCollection
    url: collections/unbabel.opencollection.json
  - type: APIReference
    url: https://developers.unbabel.com/reference/language-pair
  - type: APIReference
    url: https://developers.unbabel.com/reference/tone
  - type: APIReference
    url: https://developers.unbabel.com/reference/word-count
  - type: APIReference
    url: https://developers.unbabel.com/reference/account
- aid: unbabel:unbabel-tone-and-topic-api
  name: Unbabel Tone and Topic API
  description: Available tones and topics/domains for a translation.
  humanURL: https://developers.unbabel.com/docs/introduction
  baseURL: https://api.unbabel.com/tapi/v2
  tags:
  - Tone and Topic
  properties:
  - type: OpenAPI
    url: openapi/unbabel-tone-and-topic-api-openapi.yml
  - type: Documentation
    url: https://developers.unbabel.com/docs/introduction
  - type: APIReference
    url: https://developers.unbabel.com/reference/translation-list-update
  - type: PostmanCollection
    url: collections/unbabel.postman_collection.json
  - type: OpenCollection
    url: collections/unbabel.opencollection.json
  - type: APIReference
    url: https://developers.unbabel.com/reference/language-pair
  - type: APIReference
    url: https://developers.unbabel.com/reference/tone
  - type: APIReference
    url: https://developers.unbabel.com/reference/word-count
  - type: APIReference
    url: https://developers.unbabel.com/reference/account
- aid: unbabel:unbabel-translation-api
  name: Unbabel Translation API
  description: Submit and manage AI-plus-human translation jobs.
  humanURL: https://developers.unbabel.com/docs/introduction
  baseURL: https://api.unbabel.com/tapi/v2
  tags:
  - Translation
  properties:
  - type: OpenAPI
    url: openapi/unbabel-translation-api-openapi.yml
  - type: Documentation
    url: https://developers.unbabel.com/docs/introduction
  - type: APIReference
    url: https://developers.unbabel.com/reference/translation-list-update
  - type: PostmanCollection
    url: collections/unbabel.postman_collection.json
  - type: OpenCollection
    url: collections/unbabel.opencollection.json
  - type: APIReference
    url: https://developers.unbabel.com/reference/language-pair
  - type: APIReference
    url: https://developers.unbabel.com/reference/tone
  - type: APIReference
    url: https://developers.unbabel.com/reference/word-count
  - type: APIReference
    url: https://developers.unbabel.com/reference/account
- aid: unbabel:unbabel-word-count-api
  name: Unbabel Word Count API
  description: Billable word count calculation for a block of text.
  humanURL: https://developers.unbabel.com/docs/introduction
  baseURL: https://api.unbabel.com/tapi/v2
  tags:
  - Word Count
  properties:
  - type: OpenAPI
    url: openapi/unbabel-word-count-api-openapi.yml
  - type: Documentation
    url: https://developers.unbabel.com/docs/introduction
  - type: APIReference
    url: https://developers.unbabel.com/reference/translation-list-update
  - type: PostmanCollection
    url: collections/unbabel.postman_collection.json
  - type: OpenCollection
    url: collections/unbabel.opencollection.json
  - type: APIReference
    url: https://developers.unbabel.com/reference/language-pair
  - type: APIReference
    url: https://developers.unbabel.com/reference/tone
  - type: APIReference
    url: https://developers.unbabel.com/reference/word-count
  - type: APIReference
    url: https://developers.unbabel.com/reference/account
common:
- type: AgenticAccess
  url: agentic-access/unbabel-agentic-access.yml
- type: TrustCenter
  url: security/unbabel-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/unbabel-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/unbabel-domain-security.yml
- type: Authentication
  url: authentication/unbabel-authentication.yml
- type: GitHubOrganization
  url: https://github.com/Unbabel
- type: LinkedIn
  url: https://www.linkedin.com/company/unbabel
- type: Website
  url: https://unbabel.com
- type: Documentation
  url: https://developers.unbabel.com
- type: Plans
  url: plans/unbabel-plans-pricing.yml
- type: RateLimits
  url: rate-limits/unbabel-rate-limits.yml
- type: FinOps
  url: finops/unbabel-finops.yml
- url: https://unbabel.com/feed/
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Unbabel

Kin Score

APIs 6

Unbabel Account API

Unbabel Language Pairs API

Unbabel Machine Translation API

Unbabel Tone and Topic API

Unbabel Translation API

Unbabel Word Count API

Open Collections 1

Unbabel Translation API

Pricing Plans 1

Unbabel Plans Pricing

Rate Limits 1

Unbabel Rate Limits

FinOps 1

Unbabel Finops

Security Posture 4

Unbabel Authentication

Unbabel Domain Security

Unbabel Vulnerability Disclosure

Unbabel Trust Center

Agentic Access 1

Unbabel Agentic Access

Resources