AI API Router Directory

Fish Audio (fish.audio) is a voice AI platform offering text-to-speech, speech-to-text, voice cloning and real-time streaming through a web app, REST API and SDKs, billed per million UTF-8 bytes rather than per character. Its developer pricing page lists s2.1-pro, s2-pro and s1 at $15.00 per million UTF-8 bytes (about 180,000 English words or 12 hours of speech), ASR transcribe-1 at $0.36 per audio hour and voice-design-1 at $0.01 per successful request, and states there are no subscription fees or monthly minimums for API access. A free counterpart model, s2.1-pro-free, is priced at $0.00 per million UTF-8 bytes with the same quality and 83-language coverage as the paid model but without time-to-first-audio or deployment-slot guarantees.

s2.1-pro-free is priced at $0.00 per 1M UTF-8 bytes in the official pricing table on docs.fish.audio — a free model rather than a cash credit, subject to fair-use limits and without TTFA or DPA guarantees (checked 2026-09-16).