Unbabel website screenshot

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
25.1/100 emerging ▬ flat Agent 20/100 agent aware saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0
AccessPaid
1 APIs
TranslationLocalizationLanguage OperationsLangOpsMachine TranslationHuman-in-the-LoopArtificial Intelligence

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0
Composite quality — 25.1/100 · emerging
Contract Quality 0.0 / 23
Developer Ergonomics 4.5 / 18
Access Clarity 8.5 / 18
Operational Transparency 4.0 / 12
Contract Governance 0.0 / 11
Discoverability 6.2 / 9
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 20/100 · 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 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
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.
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/unbabel: 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 6

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

Unbabel Account API

Authenticated customer account information.

Unbabel Language Pairs API

Supported source-to-target language combinations.

Unbabel Machine Translation API

Pure machine-translation jobs, optionally upgradeable to human review.

Unbabel Tone and Topic API

Available tones and topics/domains for a translation.

Unbabel Translation API

Submit and manage AI-plus-human translation jobs.

Unbabel Word Count API

Billable word count calculation for a block of text.

Open Collections 8

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

API Collection

OPEN COLLECTION

Unbabel Translation Account API

OPEN COLLECTION

Unbabel Translation Account Language Pairs API

OPEN COLLECTION

Unbabel Translation Account Machine Translation API

OPEN COLLECTION

Unbabel Translation Account Tone and Topic API

OPEN COLLECTION

Unbabel Account Translation API

OPEN COLLECTION

Unbabel Translation Account Word Count API

OPEN COLLECTION

Unbabel Translation API

OPEN COLLECTION

Scroll for all 8

Pricing Plans 1

Published pricing tiers and plan structures.

Unbabel Plans Pricing

3 plans

PLANS

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.

Unbabel Finops

FINOPS

Security Posture 4

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

Unbabel Authentication

apiKey · 1 scheme

SECURITY

Unbabel Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Unbabel Vulnerability Disclosure

disclosure policy published

SECURITY

Unbabel Trust Center

ISO 27001, GDPR

SECURITY

Agentic Access 1

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

Unbabel Agentic Access

13 operations · 5 acting

13 operations · 5 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

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
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
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.
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: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  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
- Artificial Intelligence
tags_raw:
- Translation
- Localization
- Language Operations
- LangOps
- Machine Translation
- Human in the Loop
- AI
created: '2026-07-03'
modified: '2026-07-03'
specificationVersion: '0.23'
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

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