Convert text to speech using OpenAI TTS-1-HD (higher fidelity). Returns base64-encoded audio. Same interface as /api/tts but with better audio quality. No API key needed; pay per call via x402. Text capped at 2000 chars.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.10 USDC | 0xaBF4...a9D0 |