Developers integrating voice features must choose between limited commercial APIs or complex self-hosted models. A unified API wrapping multiple voice models would let them switch providers easily.
Build a proxy layer that standardizes inputs/outputs across voice models (like ElevenLabs, PlayHT), with usage-based billing. Monetize through API call margins.
MVP could support just 2-3 major providers with basic text-to-speech endpoints.
Challenges include model performance variance and high compute costs for some architectures.