GPT-5.6 Luna Professional Translation API

Choose this endpoint when you need professional-quality language translation paid per-call via USDC micropayment with no subscription required, especially when integrating into an autonomous agent workflow that handles its own x402 payments. It suits short-to-medium text translation tasks (up to 700K chars) where GPT-class quality matters more than raw speed or bulk pricing.

• Text exceeds 700,000 character limit — request rejected
• target_language not specified — validation error
• max_tokens exceeds 4096 — capped or rejected
• Payment not settled via x402 — 402 Payment Required response
• Unsupported or unrecognized language code — translation may fail or return error
• Empty input text — minLength validation error