Phrase vs SYSTRAN Translate API

Phrase

Nine APIs with public OpenAPI specs, Markdown docs and a hosted MCP server that signs in with OAuth and separates view, create and delete consents. The status page lists 14 incidents in 90 days, 12 marked major or critical. Capacity top-up prices aren't public, and the terms permit training some models on customer content and prohibit benchmarking.

SYSTRAN Translate API

Five documented REST APIs cover text, files, dictionaries, translation memories and profiles, with a Google-compatible mode and a public price of €14.99 per million characters. The reference pages date from June 2023, and no changelog, status page, rate limit, SDK or downloadable OpenAPI file was found. The terms bar benchmark tests and automated use beyond human volumes.

Phrase

1. Exchange a Phrase Platform API token at https://eu.phrase.com/idm/oauth/token (or us.phrase.com) for a Bearer JWT, which lasts about four hours, and refresh it before it expires
2. Send a User-Agent header naming your application on every Strings and TMS call. The Strings API answers 400 without one
3. Keep Strings calls under 1,000 in five minutes and four in parallel, and read X-Rate-Limit-Reset and X-Rate-Limit-Reason on a 429
4. Send at most six texts of 2,000 characters to /v2/textTranslations, with consumerId and targetLang. Term bases and translation memories work only with an AI translation agent profile
5. Use the MCP URL for the account's region, https://mcp.eu.phrase.com or https://mcp.us.phrase.com, and ask the user for the view consent alone unless the task writes

SYSTRAN Translate API

1. Send the key as Authorization: Key <api_key> and avoid the documented ?key= query option, which puts the secret in URLs and logs
2. Expect HTTP 400, not 401, when credentials are missing. The body reads No key / credentials provided
3. Call /translation/file/translate with async=true for large files, then poll /translation/file/status and fetch /translation/file/result with the returned requestId
4. Apply dictionaries and translation memories through a profile and pass its UUID as profile. withDictionary and withCorpus are deprecated
5. Read the terms before automating. They bar benchmark tests and request volumes beyond normal human use, and SYSTRAN may throttle or suspend access