Gemini 3.1 Flash API

Gemini 3.1 Flash TTS Text to Speech API Documentation

https://gateway.pixazo.ai/gemini-flash-tts/v1

Authentication

All requests require an API key passed via header.

Header	Type	Required	Description
Ocp-Apim-Subscription-Key	string	Yes	Your API subscription key

Gemini Flash TTS generate request - Gemini Flash TTS API

Request Code

POST https://gateway.pixazo.ai/gemini-flash-tts/v1/gemini-flash-tts/generate
Content-Type: application/json
Cache-Control: no-cache
Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY

{
  "text": "Hey there, I am a new text to speech model and I can say things in many different ways.",
  "voice": "Algenib",
  "prompt": "Say this in a dramatic, theatrical tone",
  "language_code": "en-GB"
}

import requests

url = "https://gateway.pixazo.ai/gemini-flash-tts/v1/gemini-flash-tts/generate"
headers = {
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
}
data = {
    "text": "Hey there, I am a new text to speech model and I can say things in many different ways.",
    "voice": "Algenib",
    "prompt": "Say this in a dramatic, theatrical tone",
    "language_code": "en-GB"
}

response = requests.post(url, json=data, headers=headers)
print(response.json())

const url = 'https://gateway.pixazo.ai/gemini-flash-tts/v1/gemini-flash-tts/generate';

const data = {
  text: 'Hey there, I am a new text to speech model and I can say things in many different ways.',
  voice: 'Algenib',
  prompt: 'Say this in a dramatic, theatrical tone',
  language_code: 'en-GB'
};

fetch(url, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Cache-Control': 'no-cache',
    'Ocp-Apim-Subscription-Key': 'YOUR_SUBSCRIPTION_KEY'
  },
  body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

curl -X POST "https://gateway.pixazo.ai/gemini-flash-tts/v1/gemini-flash-tts/generate" \
  -H "Content-Type: application/json" \
  -H "Cache-Control: no-cache" \
  -H "Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY" \
  --data-raw '{
    "text": "Hey there, I am a new text to speech model and I can say things in many different ways.",
    "voice": "Algenib",
    "prompt": "Say this in a dramatic, theatrical tone",
    "language_code": "en-GB"
  }'

Output

{
  "request_id": "gemini-flash-tts_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/gemini-flash-tts_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Try Now

Webhook (Optional)

Add the X-Webhook-URL header to your generate request to receive a POST callback instead of polling.

X-Webhook-URL: https://your-server.com/webhook/callback

Request Parameters - Gemini Flash TTS generate request

Parameter	Required	Type	Description
text	Yes	string	The textual content to convert into speech. Must be a valid string of readable language.
voice	No	string	Voice preset name used for narration (e.g., `Algenib`). Controls timbre and speaker identity.
prompt	No	string	Style instruction that shapes delivery, emotion, pacing, or accent (e.g., `Say this in a dramatic, theatrical tone`).
language_code	No	string	BCP-47 language code hint for pronunciation (e.g., `en-US`, `en-GB`).

Example Request

{
  "text": "Hey there, I am a new text to speech model and I can say things in many different ways.",
  "voice": "Algenib",
  "prompt": "Say this in a dramatic, theatrical tone",
  "language_code": "en-GB"
}

Response

{
  "request_id": "gemini-flash-tts_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/gemini-flash-tts_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Value
Content-Type	application/json
Cache-Control	no-cache
Ocp-Apim-Subscription-Key	YOUR_SUBSCRIPTION_KEY

Response Handling

Common status codes.

Code	Meaning
202	Accepted — Request queued
400	Bad Request
401	Unauthorized
402	Insufficient Balance
403	Forbidden
429	Too Many Requests
500	Internal Server Error

Error Responses

Queue system errors and model validation errors.

Queue System Errors

// 402 — Insufficient balance
{
  "error": "Insufficient Balance",
  "message": "Your wallet does not have enough balance. Required: $0.04"
}

// 400 — Model not found
{
  "error": "Model not found",
  "message": "Model 'gemini-flash-tts' not found or is disabled"
}

Error via Status/Webhook

{
  "request_id": "gemini-flash-tts_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "gemini-flash-tts",
  "error": "Description of the error",
  "output": null
}

Retrieving Results

Poll the universal status endpoint to check progress and retrieve results.

Endpoint

GET https://gateway.pixazo.ai/v2/requests/status/{request_id}
Ocp-Apim-Subscription-Key: YOUR_API_KEY

cURL Example

curl -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  "https://gateway.pixazo.ai/v2/requests/status/gemini-flash-tts_019d9a88-bba1-7f39-2655-a0c5f4a109529"

Response (Completed)

{
  "request_id": "gemini-flash-tts_019d9a88-bba1-7f39-2655-a0c5f4a109529",
  "status": "COMPLETED",
  "model_id": "gemini-flash-tts",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/gemini-flash-tts_019d9a88-bba1-7f39-2655-a0c5f4a109529/output.wav"
    ],
    "media_type": "audio/wav"
  },
  "created_at": "2026-04-17T08:22:25.893Z",
  "updated_at": "2026-04-17T08:22:43.000Z",
  "completed_at": "2026-04-17T08:22:43.000Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier
status	string	QUEUED, PROCESSING, COMPLETED, FAILED, or ERROR
model_id	string	Model that processed the request
error	string\|null	Error message if failed
output.media_url	array	URLs to generated media (R2 CDN)
output.media_type	string	MIME type (audio/wav)
created_at	string	When request was created
completed_at	string\|null	When request completed
polling_url	string	Status URL (initial response only)

Status Values

Status	Description
QUEUED	Request accepted, waiting to be processed
PROCESSING	Being processed by the model
COMPLETED	Done — output contains the result
FAILED	Failed — check error field
ERROR	System error — not charged

Status Flow

QUEUED → PROCESSING → COMPLETED
                    → FAILED
                    → ERROR

Typical Workflow

Send a generate request to the API endpoint
Save the request_id from the response
Poll every 5-10 seconds: GET /v2/requests/status/{request_id}
When status is "COMPLETED", download from output.media_url

Tip: Use X-Webhook-URL header to get a callback instead of polling.

Gemini 3.1 Flash API - AI Text to Speech Generation APIs

Models Version

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