Pixazo API→Models→Text to Speech API→Inworld TTS

Inworld TTS 2 API, Inworld TTS 1.5 Max API, Inworld TTS 1.5 Mini API: Pricing, Documentation

Inworld TTS 2 API converts text into highly expressive character speech. It enables real-time vocal generation with customizable emotional depth and inflection. Developers can instantly integrate dynamic voice lines into interactive narrative experiences. This engine ensures low-latency playback for conversational AI and gaming assets.

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Inworld TTS 2 API Documentation

Inworld's flagship voice model, with 90+ voices and inline direction — write [whisper] or [say excitedly] straight into the text. Asynchronous: submit returns a request_id; poll the status endpoint until the request is COMPLETED, then download the audio.

POST https://gateway.pixazo.ai/inworld-tts-2/v1/text-to-speech

Authentication

All requests require an API key passed via header.

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

Text to Speech - Inworld TTS 2

Request Code

POST https://gateway.pixazo.ai/inworld-tts-2/v1/text-to-speech
Content-Type: application/json
Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY

{
  "text": "Hello from Pixazo. This is a text to speech demo.",
  "voice_id": "Dennis"
}

import requests

url = "https://gateway.pixazo.ai/inworld-tts-2/v1/text-to-speech"
headers = {
    "Content-Type": "application/json",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
}
data = {
  "text": "Hello from Pixazo. This is a text to speech demo.",
  "voice_id": "Dennis"
}

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

const res = await fetch("https://gateway.pixazo.ai/inworld-tts-2/v1/text-to-speech", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
  },
  body: JSON.stringify({
  "text": "Hello from Pixazo. This is a text to speech demo.",
  "voice_id": "Dennis"
})
});
console.log(await res.json());

curl -X POST 'https://gateway.pixazo.ai/inworld-tts-2/v1/text-to-speech' \
  -H 'Content-Type: application/json' \
  -H 'Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY' \
  --data-raw '{"text": "Hello from Pixazo. This is a text to speech demo.", "voice_id": "Dennis"}'

Output

{
  "request_id": "inworld-tts-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/inworld-tts-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Try Now

Webhook (Optional)

Instead of polling, you can receive a Webhook callback when the request reaches a terminal state. Provide a Webhook URL via header on the submit request.

Header	Required	Description
X-Webhook-URL	To enable	HTTPS URL to receive the Webhook callback.
X-Webhook-Mode	No	`terminal` (default, one callback on COMPLETED/ERROR) or `sync` (per-poll callbacks).

Example: enable Webhook

curl -X POST 'https://gateway.pixazo.ai/inworld-tts-2/v1/text-to-speech' \
  -H 'Content-Type: application/json' \
  -H 'Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY' \
  -H 'X-Webhook-URL: https://your-server.com/webhook' \
  --data-raw '{"text": "Hello from Pixazo. This is a text to speech demo.", "voice_id": "Dennis"}'

Callback Payload (success)

{
  "request_id": "inworld-tts-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "inworld-tts-2",
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/{request_id}/output.mp3"
    ],
    "media_type": "audio/mpeg"
  },
  "created_at": "2026-08-01T09:14:16.102Z",
  "completed_at": "2026-08-01T09:14:22.870Z"
}

Failure callback shape

{
  "request_id": "inworld-tts-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "inworld-tts-2",
  "error": "Description of the failure"
}

Delivery semantics

terminal mode: one Webhook callback when the request is COMPLETED or ERROR.
sync mode: a Webhook callback on each status change.
Callbacks are idempotent on request_id — de-duplicate on it.
Respond 200 within a few seconds; the Webhook endpoint must be HTTPS.

Request Parameters

Parameter	Required	Type	Default	Allowed values / range	Description
`text`	Yes	string	—	up to 2,000 characters	The text to speak. Note this limit is tighter than most models — split longer copy into several requests.
`voice_id`	Yes	string	—	e.g. `Dennis`, `Loretta`, `Hank`	Which Inworld voice to use.
`output_format`	No	string	`mp3`	`mp3`, `opus`, `wav`, `flac`	Output container.
`temperature`	No	number	`1.1`	0.01 – 2	Higher values give more expressive, more variable delivery; lower values are flatter and more consistent.
`speaking_rate`	No	number	`1`	0.5 – 1.5	Speed multiplier.
`timestamp_type`	No	string	`none`	`none`, `word`, `character`	Request word- or character-level timings alongside the audio.

Voices

90+ voices across 15 production languages.

Example Request

{
  "text": "Hello from Pixazo. This is a text to speech demo.",
  "voice_id": "Dennis"
}

Example Response

{
  "request_id": "inworld-tts-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/inworld-tts-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Required	Description
Content-Type	Yes	`application/json`
Ocp-Apim-Subscription-Key	Yes	Your API subscription key.
X-Webhook-URL	No	Enable Webhook callbacks (see Webhook section).

Response Handling

Status Code	Meaning
202	Accepted — request queued; returns `request_id` and `polling_url`.
400	Bad request — a missing or out-of-range parameter. The message names the field.
401	Unauthorized — missing or invalid subscription key.
402	Insufficient balance.
429	Too many requests.
500	Internal server error.

Retrieving Results

Poll the status endpoint with the request_id from the submit response until status is COMPLETED (or ERROR), then download output.media_url.

curl 'https://gateway.pixazo.ai/v2/requests/status/inworld-tts-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx' \
  -H 'Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY'

Completed response

{
  "request_id": "inworld-tts-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "inworld-tts-2",
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/{request_id}/output.mp3"
    ],
    "media_type": "audio/mpeg"
  },
  "created_at": "2026-08-01T09:14:16.102Z",
  "completed_at": "2026-08-01T09:14:22.870Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier.
status	string	QUEUED, PROCESSING, COMPLETED or ERROR.
model_id	string	The model that handled the request.
output.media_url	array	URL of the generated audio file.
output.media_type	string	MIME type of the audio.
created_at	string	Request creation timestamp.
completed_at	string	Completion timestamp.
error	string	Error message when `status` is ERROR.

Status Values & Flow

QUEUED → PROCESSING → COMPLETED (success) or ERROR (failure).

Pricing

Billed at $0.025 per 1,000 characters of input text, rounded up to the next whole 1,000. You are charged for the text you submit, not the length of the audio produced.

Input text	Billed blocks	Cost
A short sentence (~50 characters)	1	$0.025
A paragraph (~800 characters)	1	$0.025
A 3,000-character article	3	$0.075
10,000 characters	10	$0.25

Failed requests are not billed.

Inworld TTS 2 API Pricing

Your request will cost $0.025 per 1,000 characters of input text.

90+ voices, about $0.025 per 1,000 characters

equivalent to $25 per 1M characters

2. Inworld TTS 1.5 Max

Inworld TTS 1.5 Max API Documentation

The stability-focused Inworld tier: sub-250ms latency with the steadiest delivery of the 1.5 line. Asynchronous: submit returns a request_id; poll the status endpoint until the request is COMPLETED, then download the audio.

POST https://gateway.pixazo.ai/inworld-tts-1-5-max/v1/text-to-speech

Authentication

All requests require an API key passed via header.

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

Text to Speech - Inworld TTS 1.5 Max

Request Code

POST https://gateway.pixazo.ai/inworld-tts-1-5-max/v1/text-to-speech
Content-Type: application/json
Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY

{
  "text": "Hello from Pixazo. This is a text to speech demo.",
  "voice_id": "Dennis"
}

import requests

url = "https://gateway.pixazo.ai/inworld-tts-1-5-max/v1/text-to-speech"
headers = {
    "Content-Type": "application/json",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
}
data = {
  "text": "Hello from Pixazo. This is a text to speech demo.",
  "voice_id": "Dennis"
}

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

const res = await fetch("https://gateway.pixazo.ai/inworld-tts-1-5-max/v1/text-to-speech", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
  },
  body: JSON.stringify({
  "text": "Hello from Pixazo. This is a text to speech demo.",
  "voice_id": "Dennis"
})
});
console.log(await res.json());

curl -X POST 'https://gateway.pixazo.ai/inworld-tts-1-5-max/v1/text-to-speech' \
  -H 'Content-Type: application/json' \
  -H 'Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY' \
  --data-raw '{"text": "Hello from Pixazo. This is a text to speech demo.", "voice_id": "Dennis"}'

Output

{
  "request_id": "inworld-tts-1-5-max_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/inworld-tts-1-5-max_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Try Now

Webhook (Optional)

Instead of polling, you can receive a Webhook callback when the request reaches a terminal state. Provide a Webhook URL via header on the submit request.

Header	Required	Description
X-Webhook-URL	To enable	HTTPS URL to receive the Webhook callback.
X-Webhook-Mode	No	`terminal` (default, one callback on COMPLETED/ERROR) or `sync` (per-poll callbacks).

Example: enable Webhook

curl -X POST 'https://gateway.pixazo.ai/inworld-tts-1-5-max/v1/text-to-speech' \
  -H 'Content-Type: application/json' \
  -H 'Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY' \
  -H 'X-Webhook-URL: https://your-server.com/webhook' \
  --data-raw '{"text": "Hello from Pixazo. This is a text to speech demo.", "voice_id": "Dennis"}'

Callback Payload (success)

{
  "request_id": "inworld-tts-1-5-max_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "inworld-tts-1-5-max",
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/{request_id}/output.mp3"
    ],
    "media_type": "audio/mpeg"
  },
  "created_at": "2026-08-01T09:14:16.102Z",
  "completed_at": "2026-08-01T09:14:22.870Z"
}

Failure callback shape

{
  "request_id": "inworld-tts-1-5-max_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "inworld-tts-1-5-max",
  "error": "Description of the failure"
}

Delivery semantics

terminal mode: one Webhook callback when the request is COMPLETED or ERROR.
sync mode: a Webhook callback on each status change.
Callbacks are idempotent on request_id — de-duplicate on it.
Respond 200 within a few seconds; the Webhook endpoint must be HTTPS.

Request Parameters

Parameter	Required	Type	Default	Allowed values / range	Description
`text`	Yes	string	—	up to 2,000 characters	The text to speak. Note this limit is tighter than most models — split longer copy into several requests.
`voice_id`	Yes	string	—	e.g. `Dennis`, `Loretta`, `Hank`	Which Inworld voice to use.
`output_format`	No	string	`mp3`	`mp3`, `opus`, `wav`, `flac`	Output container.
`temperature`	No	number	`1.1`	0.01 – 2	Higher values give more expressive, more variable delivery; lower values are flatter and more consistent.
`speaking_rate`	No	number	`1`	0.5 – 1.5	Speed multiplier.
`timestamp_type`	No	string	`none`	`none`, `word`, `character`	Request word- or character-level timings alongside the audio.

Voices

80+ voices across 15 languages.

Example Request

{
  "text": "Hello from Pixazo. This is a text to speech demo.",
  "voice_id": "Dennis"
}

Example Response

{
  "request_id": "inworld-tts-1-5-max_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/inworld-tts-1-5-max_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Required	Description
Content-Type	Yes	`application/json`
Ocp-Apim-Subscription-Key	Yes	Your API subscription key.
X-Webhook-URL	No	Enable Webhook callbacks (see Webhook section).

Response Handling

Status Code	Meaning
202	Accepted — request queued; returns `request_id` and `polling_url`.
400	Bad request — a missing or out-of-range parameter. The message names the field.
401	Unauthorized — missing or invalid subscription key.
402	Insufficient balance.
429	Too many requests.
500	Internal server error.

Retrieving Results

Poll the status endpoint with the request_id from the submit response until status is COMPLETED (or ERROR), then download output.media_url.

curl 'https://gateway.pixazo.ai/v2/requests/status/inworld-tts-1-5-max_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx' \
  -H 'Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY'

Completed response

{
  "request_id": "inworld-tts-1-5-max_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "inworld-tts-1-5-max",
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/{request_id}/output.mp3"
    ],
    "media_type": "audio/mpeg"
  },
  "created_at": "2026-08-01T09:14:16.102Z",
  "completed_at": "2026-08-01T09:14:22.870Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier.
status	string	QUEUED, PROCESSING, COMPLETED or ERROR.
model_id	string	The model that handled the request.
output.media_url	array	URL of the generated audio file.
output.media_type	string	MIME type of the audio.
created_at	string	Request creation timestamp.
completed_at	string	Completion timestamp.
error	string	Error message when `status` is ERROR.

Status Values & Flow

QUEUED → PROCESSING → COMPLETED (success) or ERROR (failure).

Pricing

Billed at $0.035 per 1,000 characters of input text, rounded up to the next whole 1,000. You are charged for the text you submit, not the length of the audio produced.

Input text	Billed blocks	Cost
A short sentence (~50 characters)	1	$0.035
A paragraph (~800 characters)	1	$0.035
A 3,000-character article	3	$0.105
10,000 characters	10	$0.35

Failed requests are not billed.

Inworld TTS 1.5 Max API Pricing

Your request will cost $0.035 per 1,000 characters of input text.

the steadiest delivery of the 1.5 line, sub-250ms

equivalent to $35 per 1M characters

3. Inworld TTS 1.5 Mini

Inworld TTS 1.5 Mini API Documentation

The fastest and cheapest Inworld tier, around 120ms latency — built for live voice agents where responsiveness beats polish. Asynchronous: submit returns a request_id; poll the status endpoint until the request is COMPLETED, then download the audio.

POST https://gateway.pixazo.ai/inworld-tts-1-5-mini/v1/text-to-speech

Authentication

All requests require an API key passed via header.

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

Text to Speech - Inworld TTS 1.5 Mini

Request Code

POST https://gateway.pixazo.ai/inworld-tts-1-5-mini/v1/text-to-speech
Content-Type: application/json
Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY

{
  "text": "Hello from Pixazo. This is a text to speech demo.",
  "voice_id": "Dennis"
}

import requests

url = "https://gateway.pixazo.ai/inworld-tts-1-5-mini/v1/text-to-speech"
headers = {
    "Content-Type": "application/json",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
}
data = {
  "text": "Hello from Pixazo. This is a text to speech demo.",
  "voice_id": "Dennis"
}

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

const res = await fetch("https://gateway.pixazo.ai/inworld-tts-1-5-mini/v1/text-to-speech", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
  },
  body: JSON.stringify({
  "text": "Hello from Pixazo. This is a text to speech demo.",
  "voice_id": "Dennis"
})
});
console.log(await res.json());

curl -X POST 'https://gateway.pixazo.ai/inworld-tts-1-5-mini/v1/text-to-speech' \
  -H 'Content-Type: application/json' \
  -H 'Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY' \
  --data-raw '{"text": "Hello from Pixazo. This is a text to speech demo.", "voice_id": "Dennis"}'

Output

{
  "request_id": "inworld-tts-1-5-mini_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/inworld-tts-1-5-mini_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Try Now

Webhook (Optional)

Instead of polling, you can receive a Webhook callback when the request reaches a terminal state. Provide a Webhook URL via header on the submit request.

Header	Required	Description
X-Webhook-URL	To enable	HTTPS URL to receive the Webhook callback.
X-Webhook-Mode	No	`terminal` (default, one callback on COMPLETED/ERROR) or `sync` (per-poll callbacks).

Example: enable Webhook

curl -X POST 'https://gateway.pixazo.ai/inworld-tts-1-5-mini/v1/text-to-speech' \
  -H 'Content-Type: application/json' \
  -H 'Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY' \
  -H 'X-Webhook-URL: https://your-server.com/webhook' \
  --data-raw '{"text": "Hello from Pixazo. This is a text to speech demo.", "voice_id": "Dennis"}'

Callback Payload (success)

{
  "request_id": "inworld-tts-1-5-mini_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "inworld-tts-1-5-mini",
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/{request_id}/output.mp3"
    ],
    "media_type": "audio/mpeg"
  },
  "created_at": "2026-08-01T09:14:16.102Z",
  "completed_at": "2026-08-01T09:14:22.870Z"
}

Failure callback shape

{
  "request_id": "inworld-tts-1-5-mini_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "inworld-tts-1-5-mini",
  "error": "Description of the failure"
}

Delivery semantics

terminal mode: one Webhook callback when the request is COMPLETED or ERROR.
sync mode: a Webhook callback on each status change.
Callbacks are idempotent on request_id — de-duplicate on it.
Respond 200 within a few seconds; the Webhook endpoint must be HTTPS.

Request Parameters

Parameter	Required	Type	Default	Allowed values / range	Description
`text`	Yes	string	—	up to 2,000 characters	The text to speak. Note this limit is tighter than most models — split longer copy into several requests.
`voice_id`	Yes	string	—	e.g. `Dennis`, `Loretta`, `Hank`	Which Inworld voice to use.
`output_format`	No	string	`mp3`	`mp3`, `opus`, `wav`, `flac`	Output container.
`temperature`	No	number	`1.1`	0.01 – 2	Higher values give more expressive, more variable delivery; lower values are flatter and more consistent.
`speaking_rate`	No	number	`1`	0.5 – 1.5	Speed multiplier.
`timestamp_type`	No	string	`none`	`none`, `word`, `character`	Request word- or character-level timings alongside the audio.

Voices

80+ voices across 15 languages.

Example Request

{
  "text": "Hello from Pixazo. This is a text to speech demo.",
  "voice_id": "Dennis"
}

Example Response

{
  "request_id": "inworld-tts-1-5-mini_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/inworld-tts-1-5-mini_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Required	Description
Content-Type	Yes	`application/json`
Ocp-Apim-Subscription-Key	Yes	Your API subscription key.
X-Webhook-URL	No	Enable Webhook callbacks (see Webhook section).

Response Handling

Status Code	Meaning
202	Accepted — request queued; returns `request_id` and `polling_url`.
400	Bad request — a missing or out-of-range parameter. The message names the field.
401	Unauthorized — missing or invalid subscription key.
402	Insufficient balance.
429	Too many requests.
500	Internal server error.

Retrieving Results

Poll the status endpoint with the request_id from the submit response until status is COMPLETED (or ERROR), then download output.media_url.

curl 'https://gateway.pixazo.ai/v2/requests/status/inworld-tts-1-5-mini_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx' \
  -H 'Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY'

Completed response

{
  "request_id": "inworld-tts-1-5-mini_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "inworld-tts-1-5-mini",
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/{request_id}/output.mp3"
    ],
    "media_type": "audio/mpeg"
  },
  "created_at": "2026-08-01T09:14:16.102Z",
  "completed_at": "2026-08-01T09:14:22.870Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier.
status	string	QUEUED, PROCESSING, COMPLETED or ERROR.
model_id	string	The model that handled the request.
output.media_url	array	URL of the generated audio file.
output.media_type	string	MIME type of the audio.
created_at	string	Request creation timestamp.
completed_at	string	Completion timestamp.
error	string	Error message when `status` is ERROR.

Status Values & Flow

QUEUED → PROCESSING → COMPLETED (success) or ERROR (failure).

Pricing

Billed at $0.015 per 1,000 characters of input text, rounded up to the next whole 1,000. You are charged for the text you submit, not the length of the audio produced.

Input text	Billed blocks	Cost
A short sentence (~50 characters)	1	$0.015
A paragraph (~800 characters)	1	$0.015
A 3,000-character article	3	$0.045
10,000 characters	10	$0.15

Failed requests are not billed.

Inworld TTS 1.5 Mini API Pricing

Your request will cost $0.015 per 1,000 characters of input text.

~120ms latency, the cheapest Inworld tier

equivalent to $15 per 1M characters

⚡ Performance

Live usage measured on Pixazo's gateway, split by model version. Generation time is how long a generation takes end-to-end (lower is better). Success rate is the percent of generations that complete (higher is better).

Show data for the last

Generations

1,100last 30d

~37 per day

Success rate

100.0%

of completed generations

Generation time

83.5savg

p95 87.4s

Requests

Jul 16max 300Aug 14

Inworld TTS 2Avg 17/day

Inworld TTS 1.5 MaxAvg 10/day

Inworld TTS 1.5 MiniAvg 10/day

Generation Time

Jul 16max 97.0sAug 14

Inworld TTS 2Avg 85.0s

Inworld TTS 1.5 MaxAvg 84.9s

Inworld TTS 1.5 MiniAvg 79.6s

Error Rate

Jul 16max 5.0%Aug 14

Inworld TTS 2Avg 0.0%

Inworld TTS 1.5 MaxAvg 0.0%

Inworld TTS 1.5 MiniAvg 0.0%

〰 Uptime

Percent of generations that succeeded over the selected period, per model version.

Avg. Success Rate (30d)

100.00%

across all generations of this model family

Uptime

Jul 16max 100%Aug 14

Inworld TTS 2Avg 100.00%

Inworld TTS 1.5 MaxAvg 100.00%

Inworld TTS 1.5 MiniAvg 100.00%