AI API Router Directory

Soniox (soniox.com) sells speech-to-text, text-to-speech and speech translation through REST and WebSocket APIs, billed by tokens rather than per minute. Official pricing works out to about $0.10 per hour for async file transcription and $0.12 per hour for real-time streaming, expressed as $1.50 per 1M input audio tokens (async) or $2.00 per 1M (real-time), with input and output text at $3.50–$4.00 per 1M tokens; TTS is $4.00 per 1M input text tokens and $21.50 per 1M output audio tokens, about $0.70 per hour of generated speech. Translation across 60+ languages, speaker diarization, language identification and smart formatting are bundled in the same call at no extra cost.

No free tier or credit grant stated on official pages (checked 2026-09-16; reviewed soniox.com/pricing, soniox.com/docs and the soniox.com home page).