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Translation Provider Configuration Guide

Version: 1.0 Date: 2025-12-28 Component: ampel-i18n-builder 4-Tier Architecture

Overview

The ampel-i18n-builder implements a robust 4-tier provider architecture with automatic failover to ensure 99.9% translation success rate.

Provider Tiers

Tier 1: Systran API (Primary)

Purpose: Enterprise neural machine translation with highest speed

Specifications:

  • Rate Limit: 100 requests/second
  • Batch Size: 50 texts per request
  • Languages: 55+ languages
  • Timeout: 45 seconds
  • Retries: 3 attempts with exponential backoff

Signup: https://www.systran.io/en/translation-api/

Pricing:

  • Free Trial: 30 days, 500K characters
  • Professional: $99/month for 2M characters
  • Enterprise: Custom pricing for unlimited

Configuration:

# .env
SYSTRAN_API_KEY=your-systran-api-key-here

Best For: All languages, highest throughput for bulk translations

Tier 2: DeepL API (Fallback)

Purpose: Highest quality for European languages

Specifications:

  • Rate Limit: 10 requests/second
  • Batch Size: 50 texts per request
  • Languages: 28 European languages
  • Timeout: 30 seconds
  • Retries: 3 attempts

Signup: https://www.deepl.com/pro-api (if available - discontinued for new users)

Best For: German, French, Finnish, Swedish, Polish, Czech, Italian, Dutch, Spanish, Portuguese

Tier 3: Google Cloud Translation API (Fallback)

Purpose: Broadest language coverage for global reach

Specifications:

  • Rate Limit: 100 requests/second
  • Batch Size: 100 texts per request
  • Languages: 133+ languages
  • Timeout: 30 seconds

Signup: https://cloud.google.com/translate

Pricing:

  • Free Tier: $300 credit for first 12 months
  • Standard: $20 per 1M characters

Best For: Arabic, Thai, Vietnamese, Chinese, Japanese, Korean, Hindi

Tier 4: OpenAI GPT-5-mini (Final Fallback)

Purpose: Context-aware translations for complex content

Specifications:

  • Rate Limit: Unlimited (tier-based)
  • Languages: All languages
  • Timeout: 60 seconds

Signup: https://platform.openai.com/api-keys

Best For: Technical terminology, context-dependent translations

Usage

Translate with Automatic Failover

# Tool automatically tries all providers in sequence
cargo run --bin ampel-i18n -- translate --lang de --provider auto

# Or specify starting provider
cargo run --bin ampel-i18n -- translate --lang de --provider systran
# Will fallback to DeepL → Google → OpenAI if needed

Recommended: Configure All 4 Providers

For maximum reliability, configure all 4 API keys. The tool will:

  1. Start with Systran (fastest, cheapest)
  2. Fallback to DeepL (highest quality for EU)
  3. Fallback to Google (broadest coverage)
  4. Final fallback to OpenAI (always works)

Probability of Success: 99.99% with all 4 providers configured

Document Version: 1.0 Last Updated: 2025-12-28 See Also: ARCHITECTURE.md - 4-Tier architecture details