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Text-to-speech

Convert text to speech using OpenAI TTS-1: returns audio (the base64-encoded file in the format asked for: mp3, opus, aac, flac, wav or pcm) with model, voice, format and chars (the characters spoken). 10 voices available. No API key needed; pay per call over x402 or MPP. Text capped at 2000 chars. Model-backed. For high-volume speech where timbre matters less, /api/tts-lite is the same interface on Kokoro-82M at $0.005.