patch
https://apis.elai.io/api/v1/voices/customization-preview
Synthesises a fixed sample sentence (translated into the requested locale) with the supplied stability and speed, so a customization can be auditioned before it is saved. Your own text is not accepted — that is PATCH /voices.
Unlike PATCH /voices this does not touch the audio cache and always allows premium voices.
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curl -X PATCH 'https://apis.elai.io/api/v1/voices/customization-preview' \
-H 'Authorization: Bearer YOUR_API_TOKEN' \
-H 'Content-Type: application/json' \
-d '{
"voice": "21m00Tcm4TlvDq8ikWAM",
"provider": "elevenlabs",
"language": "English",
"locale": "en-US",
"stability": 0.5,
"speed": 1
}'