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 API contracts indexed 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.

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30.2/100 thin ▬ flat Agent 19/100 agent aware Front door AI 4/6 moderate saas Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

AccessPaid

1 published contract

Translation LocalizationLanguage OperationsLangOpsMachine Translation Human-in-the-Loop Artificial Intelligence

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 30.2/100 · thin

Contract Quality 9.4 / 19

Developer Ergonomics 3.8 / 15

Access Clarity 2.4 / 15

Operational Transparency 2.1 / 10

Contract Governance 0.0 / 9

Discoverability 5.0 / 8

Regulatory Posture 3.1 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 19/100 · 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

Pagination 0 / 5

Distinct Operations 3 / 3

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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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	-	-	-
Hugging Face Hub Organisations	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.

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 7

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

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 7

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

no policy recorded

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

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

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.
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
x-docs-platform: stoplight
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-17
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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