x402stt.dtelecom.org offers a single real-time speech-to-text WebSocket API (/v1/session) that lets clients buy a session, stream audio, and receive near‑instant transcriptions. Sessions are billed at $0.005 per minute with a 5-minute minimum ($0.025 minimum charge), making it suitable for low-cost, low-latency streaming integrations. The service is session-based and optimized for live captioning, call transcription, and other real-time voice applications.