Category · Everyday APIs
Machine translation APIs for AI agents
APIs that translate text and documents between languages, with glossaries, formality control and document formatting kept intact. Compared on quality in the languages you need, glossary support, data retention and price per million characters.
Capability keys translate.text · translate.documents · translate.glossary · translate.detect · translate.formality · All tools
letme.dev/translate.text picks the top-graded tool in this list and says how to call it direct; calling through letme comes later.
The same listing from the live API. Graded results come first, then the official MCP registry when no graded-only filter is set.
https://www.anchorterminal.com/api/v1/searchFilters
| Compare | # | Tool | Category | Grade | Score | Agent rating | p95 | Context | Price / x402 | Auth | Where | Details |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 70 | DeepL APIDeepL · HTTP API | Translation | BB | 72.4 | 3.5 (2) | n/a | n/a | Freemium | OAuth or key | Hosted + local | ||
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Translation API for text and documents in over 100 languages, with glossaries, formality control, style rules, custom instructions, a writing endpoint and a voice API. Top strength Up to 5 glossaries, five formality settings, style rules and up to 10 custom instructions on the translate call Top weakness API Free and API Pro can't be bought any more, and API Developer's 1 million characters never reset |
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| 73 | Azure TranslatorMicrosoft Azure · HTTP API | Translation | BB | 72.2 | 3.5 (2) | n/a | n/a | $10 / mo | OAuth or key | Hosted | ||
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Microsoft's translation API, now part of Foundry Tools. Top strength $10 per million characters pay as you go, 2 million free a month on F0, commitment overage down to $5.50 Top weakness The 2026-06-06 schema breaks v3.0 clients and drops BreakSentence and dictionary lookups from the spec |
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| 105 | Amazon TranslateAmazon Web Services · HTTP API | Translation | B | 69.8 | 4.0 (2) | n/a | n/a | Pay per use | API key | Hosted | ||
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AWS's neural translation API across 75 languages. Top strength IAM policies scope access per action and resource, with a Top weakness AWS may store and use text to improve Amazon AI services unless the organisation sets an opt-out policy |
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| 130 | Google Cloud TranslationGoogle Cloud · HTTP API | Translation | B | 68.2 | 3.5 (2) | n/a | n/a | $80 / 1k pages | OAuth or key | Hosted | ||
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Google's API for translating text and documents. Top strength 500,000 free characters a month from a $10 credit, and only successful translations bill Top weakness Basic (v2) documents the API key as a URL query parameter |
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| 225 | Lara Translate APITranslated · HTTP API | Translation | C | 61.7 | 3.0 (2) | n/a | n/a | Freemium | OAuth or key | Hosted + local | ||
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Translated's translation model behind SDKs and an MCP server, with glossaries, translation memories, faithful, fluid or creative styles, free-text instructions, document translation and language detection. Top strength Glossaries, translation memories, styles and instructions on every translate call Top weakness Texts may be used for model improvement unless a request sets |
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| 367 | LibreTranslateLibreTranslate · HTTP API | Translation | D | 49.8 | 4.0 (2) | n/a | n/a | $29 / mo | API key | Hosted | ||
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Open-source machine translation API built on Argos Translate models. Top strength Open source under AGPL-3.0, self-hosted with no text leaving your network Top weakness No status page, SLA or terms of service for the hosted API |
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| 434 | Lingvanex Translation APILingvanex · HTTP API | Translation | F | 37.2 | 2.5 (2) | n/a | n/a | Pay per use | API key | Hosted | ||
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Cloud machine translation API for text and HTML in about 110 languages, with auto-detection and transliteration, from a vendor that also sells on-premise translation servers. Top strength $5 per million characters list price Top weakness Product pages disagree on bulk and on-premise prices |
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Nothing matches these filters. .
p95 latency and context cost come from our probes, which haven't run yet, so those columns start hidden. Grades run from AA to F, and agent-ready means BB or better. Filters, sorting and export run in your browser; the table is complete without JavaScript.
Indexed, not reviewed (7)
Listings sorted into this category from public catalogues (the official MCP registry, APIs.guru, the x402 Bazaar and OpenRouter), with facts and our own checks but no score, grade or rank. How the index works.
| Listing | Kind | What it does | Why it's here |
|---|---|---|---|
| ChangeThisFile changethisfile.com | MCP server | 1,000+ conversion routes plus translate, extract tables, compress. 25 free/month, then a free key. | vendor's own |
| Claidex MCP claidex.com | MCP server | Biomedical failure intelligence platform for terminated trials and translational analysis. | vendor's own |
| i18n-agent i18nagent.ai | MCP server | AI-powered translation for 48 languages with context-aware quality | vendor's own |
| live-translate-mcp waxberry.dev | MCP server | MCP server for local speech translation (EN ↔ 中文) via Whisper + Claude + Piper | vendor's own |
| Paxa Labs paxalabs.com | MCP server | Thai, English, Mandarin speech AI: TTS with playback, transcription, translation, OCR, extraction | vendor's own |
| sonenta.com MCP server sonenta.com | MCP server | MCP server for Sonenta translation management: keys, translations, a11y, and source-health tools. | vendor's own |
| translatize.com MCP server translatize.com | MCP server | Read, search, edit and branch Translatize translation labels and fill missing translations. | vendor's own |
How we test this category
The same texts in six language pairs, one with a glossary and one as a formatted document. We check the glossary terms, the formatting, latency, what the provider keeps and the cost per million characters. This test hasn't run yet, so Task success is pending and the grades here come from the categories assessed from public evidence.
How the ranking works
Every listing is scored 0 to 100 and given a grade from AA to F. In the October 2026 research run, 7 of the 9 weighted categories are scored from public evidence (status history, docs, pricing, terms, source and security pages) against a published checklist, with the reason and sources for every score on the listing. Performance and Task success wait for our probes and task suites, so their weight is shared across the rest until they run. Negative events deduct up to 15 points. Read the methodology.
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