语音转文本（OpenAI 兼容）
以 multipart/form-data 提交，音频放在 file 字段。
计费单位取决于模型：通常按输入音频的秒数计，但也存在按 token 计的模型。先看该模型的定价。
Authorization
bearerAuth Authorization: Bearer <your RouteMux API key>.
Create keys at https://routemux.com/console/keys. New keys use the sk- prefix;
the legacy rmx_live_ prefix is still accepted.
The Anthropic SDK's x-api-key and the Google SDK's x-goog-api-key are accepted too.
Sending several key headers with different values returns 400 AUTH_AMBIGUOUS_API_KEY.
In: header
Request Body
multipart/form-data
TypeScript Definitions
Use the request body type in TypeScript.
Request and response bodies match the upstream provider's official format verbatim —
RouteMux passes them through untouched. See the provider's own docs for field definitions;
the gateway itself only reads model and stream.
Response Body
application/json
application/json
application/json
curl -X POST "https://example.com/v1/audio/transcriptions"{ "model": "string", "stream": true}