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Gemini 3.8 Flash TTS

Billed at the provider's list price, with no markup. Pay per token in USDF, with no subscription and no minimum. Streaming and the OpenAI-compatible request format are supported.

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gemini-3.8-flash-tts·Unavailable·speech·Max input: 5,000 characters

No route to this model is enabled right now. Requests for it are refused with the error code model_unavailable before any balance is held, so nothing is charged. The listed prices apply once a route is enabled.

Input

$0.50

$ / 1M tokens

Output

$9.00

$ / 1M tokens

Cached input

$0.125

$ / 1M tokens

Max input

5,000

characters

Model ID
gemini-3.8-flash-tts
Modality
speech
Unit
USD per 1M tokens
Status
Unavailable
Last verified
—
Endpoints
/v1/audio/speech
Max input
5,000 characters
Pricing basis
List price
Cache write (5 min)
—
Cache write (1 h)
—
Routes enabled
0 of 1
Price sheet
2026-10-09.1

Routes

ProviderEnabledUpstream inputUpstream output
geminiNo$0.50$9.00

Make your first request

Responses include a receipt with the exact cost.

No account: send the same request to /x402/v1/audio/speech without credentials and the gateway answers 402 with the quote. Pay per request.

This model has no enabled route right now, so the request below is refused with model_unavailable until a route is enabled. Nothing is charged for a refused request.

curl https://api.usdf.fi/v1/audio/speech \
  -H "Authorization: Bearer $FOUNDRY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gemini-3.8-flash-tts", "input": "Hello", "response_format": "mp3"}' \
  --output speech.mp3  # the response body is audio bytes