xAI models API

Call 2 xAI models through one PopNow API key: Grok STT and Grok TTS. Prices start at $0.00003 per second.

models: 2
endpoints: 2
starting price, per second: $0.00003

xAI models

xAI API prices

Model	Best for	List price	PopNow price	You save
Grok STT`xai/grok-stt/speech-to-text`	Speech to Text	—	$0.00003per second
Grok TTS`xai/grok-tts/text-to-speech`	Text to Speech	—	$0.018per 1,000 characters

List prices are each maker's own published price for the same output, checked on Oct 14, 2026. Prices shown are starting prices; open a model for every tier.

Latest xAI additions

Changelog

Call a xAI model

The same request works for every model: change the model name and its input.

curl -X POST https://api.popnow.ai/api/v1/jobs/createTask \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "model": "xai/grok-stt/speech-to-text",
  "input": {
    "audio_url": "https://media.popnow.ai/shortfilm/voices/Aoede-46e4c427.mp3"
  }
}'

import os, uuid, requests

res = requests.post(
    "https://api.popnow.ai/api/v1/jobs/createTask",
    headers={
        "Authorization": f"Bearer {os.environ['POPNOW_API_KEY']}",
        "Idempotency-Key": str(uuid.uuid4()),
    },
    json={
        "model": "xai/grok-stt/speech-to-text",
        "input": {
            "audio_url": "https://media.popnow.ai/shortfilm/voices/Aoede-46e4c427.mp3"
        }
    },
    timeout=30,
)
body = res.json()
if body["code"] != 200:
    raise RuntimeError(f'{body["code"]} {body["msg"]}')
print(body["data"]["taskId"])  # poll this id, or wait for your callBackUrl

const res = await fetch("https://api.popnow.ai/api/v1/jobs/createTask", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.POPNOW_API_KEY}`,
    "Content-Type": "application/json",
    "Idempotency-Key": crypto.randomUUID(),
  },
  body: JSON.stringify({
    "model": "xai/grok-stt/speech-to-text",
    "input": {
      "audio_url": "https://media.popnow.ai/shortfilm/voices/Aoede-46e4c427.mp3"
    }
  }),
});
const { code, msg, data } = await res.json();
if (code !== 200) throw new Error(`${code} ${msg}`);
console.log(data.taskId); // poll this id, or wait for your callBackUrl

Frequently asked questions

How do I call xAI models with PopNow?

Create an API key, then send a task with the model name (for example xai/grok-stt/speech-to-text) and its input. You get a task ID back and read the result when it is ready, or receive it on your webhook.

How much do xAI models cost on PopNow?

Prices start at $0.00003 per second. Each model page lists every tier, and you get an exact quote before every run.

Which xAI models are available?

Grok STT and Grok TTS. New models are added as they are released; see the changelog.