curl --fail-with-body --request POST \
  --url "$XPILOT_API_BASE_URL/v1/voices/speech" \
  --header "Authorization: Bearer $XPILOT_API_KEY" \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: lesson-request-001' \
  --data '{"text":"Welcome to our lesson.","voice_id":"<voice_id>","voice_version":1}'

const response = await fetch(process.env.XPILOT_API_BASE_URL + "/v1/voices/speech", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.XPILOT_API_KEY}`,
    "Content-Type": "application/json",
    "Idempotency-Key": "lesson-request-001",
  },
  body: JSON.stringify({
  "text": "Welcome to our lesson.",
  "voice_id": "<voice_id>",
  "voice_version": 1
}),
});
const result = await response.json();
if (!response.ok) throw new Error(JSON.stringify(result));
console.log(result);

import os, json, requests

response = requests.request(
    "POST",
    os.environ["XPILOT_API_BASE_URL"] + "/v1/voices/speech",
    headers={
        "Authorization": "Bearer " + os.environ["XPILOT_API_KEY"],
        "Content-Type": "application/json",
        "Idempotency-Key": "lesson-request-001",
    },
    json=json.loads("{\"text\":\"Welcome to our lesson.\",\"voice_id\":\"<voice_id>\",\"voice_version\":1}"),
    timeout=70,
)
print(response.status_code, response.text)
response.raise_for_status()

{
  "data": {
    "audio_url": "data:audio/mpeg;base64,<mp3_bytes>",
    "format": "mp3",
    "voice_id": "<voice_id>",
    "voice_version": 1,
    "billing_basis": "platform_tts",
    "cost_credits": 0
  }
}

{
  "error": {
    "code": "invalid_parameter",
    "message": "Check parameter types, required fields and idempotency key."
  },
  "request_id": "<request_id>"
}

{
  "error": {
    "code": "invalid_token",
    "message": "Use an active scoped API Key. MCP OAuth tokens cannot call REST."
  },
  "request_id": "<request_id>"
}

{
  "error": {
    "code": "insufficient_scope",
    "message": "Check the credential scope and resource ownership."
  },
  "request_id": "<request_id>"
}

{
  "error": {
    "code": "idempotency_conflict",
    "message": "The same idempotency key must use the exact same input. A conversation may already be busy."
  },
  "request_id": "<request_id>"
}

{
  "error": {
    "code": "rate_limited",
    "message": "Credential/workspace rate or concurrency limit reached. Respect Retry-After before retrying.",
    "retry_after": 60
  },
  "request_id": "<request_id>"
}