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Pricing: $100/1m-tokens. Endpoint: POST /v1/models/elevenlabs/tts/eleven-v3/runs.
Generate text-to-speech audio using Eleven-v3 from ElevenLabs.

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Overview

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Pricing

  • Base price: $100/1m-tokens
  • Note: Usage-based, per 1000 characters

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ElevenLabs TTS v3 API

Endpoint: POST /v1/models/elevenlabs/tts/eleven-v3/runs

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Run the model

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Python

import requests

response = requests.post(
    "https://api.runflow.io/v1/models/elevenlabs/tts/eleven-v3/runs",
    headers={"Authorization": "Bearer RUNFLOW_API_KEY"},
    json={
        "input": {
            "text": "Welcome to the Runflow Lab! This week we shipped five new models and honestly, the hardest part was naming them. Turns out, all the good AI names are taken."
        },
        "callback_url": "https://your-server.com/webhook"
    },
)

data = response.json()
print(data)

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Node.js

const response = await fetch(
  "https://api.runflow.io/v1/models/elevenlabs/tts/eleven-v3/runs",
  {
    method: "POST",
    headers: {
      "Authorization": "Bearer RUNFLOW_API_KEY",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
        "input": {
            "text": "Welcome to the Runflow Lab! This week we shipped five new models and honestly, the hardest part was naming them. Turns out, all the good AI names are taken."
        },
        "callback_url": "https://your-server.com/webhook"
    }),
  }
);

const data = await response.json();
console.log(data);

​
cURL

curl -X POST https://api.runflow.io/v1/models/elevenlabs/tts/eleven-v3/runs \
  -H "Authorization: Bearer $RUNFLOW_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'JSON'
{
    "input": {
        "text": "Welcome to the Runflow Lab! This week we shipped five new models and honestly, the hardest part was naming them. Turns out, all the good AI names are taken."
    },
    "callback_url": "https://your-server.com/webhook"
}
JSON

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Request parameters

ParameterTypeRequiredDescription
inputobjectrequiredModel input parameters. See “Input schema” below.
callback_urlstring | nulloptionalWebhook URL - POSTed when the run reaches a terminal state.
metadataobject | nulloptionalArbitrary key-value pairs attached to the run.

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Input schema

FieldTypeRequiredAllowed valuesDescription
textstringrequiredAnyThe text to convert to speech
voicestringoptionalAnyThe voice to use for speech generation
language_codestringoptionalAnyLanguage code (ISO 639-1) used to enforce a language for the model.
stabilityfloatoptionalAnyVoice stability (0-1)
apply_text_normalizationstringoptionalauto, on, offThis parameter controls text normalization with three modes: ‘auto’, ‘on’, and ‘off’. When set to ‘auto’, the system will automatically decide whether to apply text normalization (e.g., spelling out numbers). With ‘on’, text normalization will always be applied, while with ‘off’, it will be skipped.
timestampsbooleanoptionalAnyWhether to return timestamps for each word in the generated speech

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Output schema

FieldTypeDescription
outputsjsonUnified output array - one entry per generated artifact with url/type/width/height/duration/etc.
model_datajsonModel-specific extra fields (prompt, description, actual_prompt, masks, etc.) keyed by field name.
nsfw_detectedjsontrue if the provider flagged output as NSFW, false if cleared, null if not checked.
seedjsonDeterministic seed used for generation, or null if the provider doesn’t return one.
timingjsonProvider timing info (inference_ms etc.), or null.

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Callback payload

When you provide a callback_url, Runflow POSTs to it once the run reaches a terminal state.
FieldTypeDescription
eventstringEvent type: “run.completed”, “run.failed”, or “run.cancelled”.
run_idstringThe unique identifier of the run.
statusstringTerminal status: “succeeded”, “failed”, or “cancelled”.
outputobject | nullThe run output. Null if the run failed or was cancelled.
duration_msnumber | nullTotal run duration in milliseconds.
created_atstring | nullISO 8601 timestamp when the run was created.
completed_atstring | nullISO 8601 timestamp when the run reached terminal state.
metadataobject | nullThe metadata object passed at run creation, if any.
  • Retries: 3 attempts with exponential backoff (1s, 2s). Retries on 5xx / network errors only.
  • Headers: Runflow-Request-Id is always sent. Runflow-Signature is sent if a signing secret is configured.

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Additional Resources

Browse all models

Browse the catalog.

Run lifecycle

Callbacks, polling, statuses.

Callbacks

Handle async results.

Pricing

How requests bill out.