curl --request POST 'https://api.voicecheap.ai/v1/actions/subtitles_translate' \
--header "x-api-key: $VOICECHEAP_API_KEY" \
--header 'Content-Type: application/json' \
--data '{"subtitleContent":"1\n00:00:00,000 --> 00:00:01,500\nHello world.\n","fileName":"interview.srt","format":"srt","sourceLanguage":"english","targetLanguage":"french","requestId":"13579bdf-2468-4ace-8bdf-0123456789ab"}'
const input = {
subtitleContent: '1\n00:00:00,000 --> 00:00:01,500\nHello world.\n',
fileName: 'interview.srt',
format: 'srt',
sourceLanguage: 'english',
targetLanguage: 'french',
requestId: '13579bdf-2468-4ace-8bdf-0123456789ab',
};
const response = await fetch('https://api.voicecheap.ai/v1/actions/subtitles_translate', {
method: 'POST',
headers: {
'x-api-key': process.env.VOICECHEAP_API_KEY,
'Content-Type': 'application/json',
},
body: JSON.stringify(input),
});
const body = await response.json();
if (!response.ok) throw new Error(body.code + ': ' + body.message);
console.log(body);
import os
import requests
response = requests.post(
"https://api.voicecheap.ai/v1/actions/subtitles_translate",
headers={"x-api-key": os.environ["VOICECHEAP_API_KEY"]},
json={"subtitleContent": "1\n00:00:00,000 --> 00:00:01,500\nHello world.\n", "fileName": "interview.srt", "format": "srt", "sourceLanguage": "english", "targetLanguage": "french", "requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"},
timeout=120,
)
body = response.json()
if not response.ok:
raise RuntimeError(f"{body.get('code')}: {body.get('message')}")
print(body)
{
"data": {
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"status": "running",
"pollAction": "action_request_get",
"pollAfterSeconds": 5
},
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"
}
{
"data": {
"resultId": "b3caf96f-5f2a-4619-832c-a12c0d57f78b",
"operation": "subtitles_translate",
"createdAt": 1792152000000,
"fileName": "voicecheap-subtitles_translate-b3caf96f-5f2a-4619-832c-a12c0d57f78b.json",
"byteLength": 365,
"contentType": "application/json; charset=utf-8",
"status": "completed",
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"getAction": "subtitles_result_get",
"downloadAction": "subtitles_result_download",
"listAction": "subtitles_result_list"
},
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"
}
{
"data": {
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"operation": "subtitles_translate",
"createdAt": 1792144800000,
"updatedAt": 1792144820000,
"status": "running",
"pollAfterSeconds": 5
},
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"
}
{
"data": {
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"operation": "subtitles_translate",
"createdAt": 1792144800000,
"updatedAt": 1792144820000,
"status": "completed",
"resultStored": false,
"message": "The action completed. Retrieve its output from the corresponding history or resource action."
},
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"
}
Subtitles and captions
Translate subtitles
Translate SRT or VTT subtitles, preserving timing and formatting. Saves the result in subtitle translation history. Returns a compact saved-result reference; use its getAction or downloadAction to retrieve the complete output.
POST
/
v1
/
actions
/
subtitles_translate
curl --request POST 'https://api.voicecheap.ai/v1/actions/subtitles_translate' \
--header "x-api-key: $VOICECHEAP_API_KEY" \
--header 'Content-Type: application/json' \
--data '{"subtitleContent":"1\n00:00:00,000 --> 00:00:01,500\nHello world.\n","fileName":"interview.srt","format":"srt","sourceLanguage":"english","targetLanguage":"french","requestId":"13579bdf-2468-4ace-8bdf-0123456789ab"}'
const input = {
subtitleContent: '1\n00:00:00,000 --> 00:00:01,500\nHello world.\n',
fileName: 'interview.srt',
format: 'srt',
sourceLanguage: 'english',
targetLanguage: 'french',
requestId: '13579bdf-2468-4ace-8bdf-0123456789ab',
};
const response = await fetch('https://api.voicecheap.ai/v1/actions/subtitles_translate', {
method: 'POST',
headers: {
'x-api-key': process.env.VOICECHEAP_API_KEY,
'Content-Type': 'application/json',
},
body: JSON.stringify(input),
});
const body = await response.json();
if (!response.ok) throw new Error(body.code + ': ' + body.message);
console.log(body);
import os
import requests
response = requests.post(
"https://api.voicecheap.ai/v1/actions/subtitles_translate",
headers={"x-api-key": os.environ["VOICECHEAP_API_KEY"]},
json={"subtitleContent": "1\n00:00:00,000 --> 00:00:01,500\nHello world.\n", "fileName": "interview.srt", "format": "srt", "sourceLanguage": "english", "targetLanguage": "french", "requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"},
timeout=120,
)
body = response.json()
if not response.ok:
raise RuntimeError(f"{body.get('code')}: {body.get('message')}")
print(body)
{
"data": {
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"status": "running",
"pollAction": "action_request_get",
"pollAfterSeconds": 5
},
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"
}
{
"data": {
"resultId": "b3caf96f-5f2a-4619-832c-a12c0d57f78b",
"operation": "subtitles_translate",
"createdAt": 1792152000000,
"fileName": "voicecheap-subtitles_translate-b3caf96f-5f2a-4619-832c-a12c0d57f78b.json",
"byteLength": 365,
"contentType": "application/json; charset=utf-8",
"status": "completed",
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"getAction": "subtitles_result_get",
"downloadAction": "subtitles_result_download",
"listAction": "subtitles_result_list"
},
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"
}
{
"data": {
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"operation": "subtitles_translate",
"createdAt": 1792144800000,
"updatedAt": 1792144820000,
"status": "running",
"pollAfterSeconds": 5
},
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"
}
{
"data": {
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"operation": "subtitles_translate",
"createdAt": 1792144800000,
"updatedAt": 1792144820000,
"status": "completed",
"resultStored": false,
"message": "The action completed. Retrieve its output from the corresponding history or resource action."
},
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"
}
Translate SRT or VTT subtitles, preserving timing and formatting. Saves the result in subtitle translation history. Returns a compact saved-result reference; use its getAction or downloadAction to retrieve the complete output.
Required permissions:
POST https://api.voicecheap.ai/v1/actions/subtitles_translate
Authentication and permissions
string
required
Send a VoiceCheap API key in this header. Authorization: Bearer with the same API key is also supported. OAuth access tokens are accepted only by
MCP, not by this REST endpoint.
subtitles:write.
An active paid subscription is required. Permissions do not change team roles, resource ownership, media credits, or plan limits.
Parameters
string
required
Text value.Minimum length: 1. Maximum length: 2097152.
string
Text value.Minimum length: 1. Maximum length: 255. Pattern:
^[^/\\\r\n\0]+$.string
Text value.Allowed values: “srt”, “vtt”.
string
Text value.Minimum length: 2. Maximum length: 60.
string
required
Text value.Minimum length: 2. Maximum length: 60.
string
Optional at the transport boundary: the server injects an identifier before validation when omitted. Supply your own stable UUID v4 to recover safely from a lost response.Format: “uuid”. Pattern:
^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$.Complete input schema
Complete input schema
The JSON Schema below preserves the exact field names, nested types, defaults, bounds, and accepted values exposed by discovery. Additional cross-field rules are listed in the operation notes.
{
"type": "object",
"properties": {
"subtitleContent": {
"type": "string",
"minLength": 1,
"maxLength": 2097152
},
"fileName": {
"type": "string",
"minLength": 1,
"maxLength": 255,
"pattern": "^[^/\\\\\\r\\n\\0]+$"
},
"format": {
"type": "string",
"enum": ["srt", "vtt"]
},
"sourceLanguage": {
"type": "string",
"minLength": 2,
"maxLength": 60
},
"targetLanguage": {
"type": "string",
"minLength": 2,
"maxLength": 60
},
"requestId": {
"description": "UUID v4 for this action. Reuse the same ID with identical arguments on retries.",
"type": "string",
"format": "uuid",
"pattern": "^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$"
}
},
"required": ["subtitleContent", "targetLanguage"],
"additionalProperties": false
}
Idempotency
Use a UUID v4 in requestId or the Idempotency-Key HTTP header for each mutation. Reuse the same identifier and identical arguments after a network failure. If both are supplied, they must match. Replaying a saved request does not repeat the operation or charge another monthly call. Failed or interrupted requests are not restarted automatically. Every mutation can return HTTP 202 when a retry finds the same request still running, even when its first execution is normally synchronous. If execution completed but resultStored is false, a retry returns HTTP 200 with saved request state instead of the original result. Retrieve the output through its domain history, result, or download action.Request examples
Replace example resource identifiers and media keys with values returned for your account. Keep the request identifier stable when retrying the same mutation.curl --request POST 'https://api.voicecheap.ai/v1/actions/subtitles_translate' \
--header "x-api-key: $VOICECHEAP_API_KEY" \
--header 'Content-Type: application/json' \
--data '{"subtitleContent":"1\n00:00:00,000 --> 00:00:01,500\nHello world.\n","fileName":"interview.srt","format":"srt","sourceLanguage":"english","targetLanguage":"french","requestId":"13579bdf-2468-4ace-8bdf-0123456789ab"}'
const input = {
subtitleContent: '1\n00:00:00,000 --> 00:00:01,500\nHello world.\n',
fileName: 'interview.srt',
format: 'srt',
sourceLanguage: 'english',
targetLanguage: 'french',
requestId: '13579bdf-2468-4ace-8bdf-0123456789ab',
};
const response = await fetch('https://api.voicecheap.ai/v1/actions/subtitles_translate', {
method: 'POST',
headers: {
'x-api-key': process.env.VOICECHEAP_API_KEY,
'Content-Type': 'application/json',
},
body: JSON.stringify(input),
});
const body = await response.json();
if (!response.ok) throw new Error(body.code + ': ' + body.message);
console.log(body);
import os
import requests
response = requests.post(
"https://api.voicecheap.ai/v1/actions/subtitles_translate",
headers={"x-api-key": os.environ["VOICECHEAP_API_KEY"]},
json={"subtitleContent": "1\n00:00:00,000 --> 00:00:01,500\nHello world.\n", "fileName": "interview.srt", "format": "srt", "sourceLanguage": "english", "targetLanguage": "french", "requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"},
timeout=120,
)
body = response.json()
if not response.ok:
raise RuntimeError(f"{body.get('code')}: {body.get('message')}")
print(body)
Response
This operation returns HTTP 202 while running. Save requestId and poll action_request_get with that identifier and the original operation name. Polling states are running, completed, failed, and interrupted. A completed result can point to a separate media job; continue with the operation-specific status or output action. A saved subtitle-translation reference. Its complete JSON contains originalContent, translatedContent, matching sourceFormat/outputFormat, fileName, sourceLanguage, targetLanguage, cueCount and characterCount; historyId and detectedLanguage are optional.{
"data": {
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"status": "running",
"pollAction": "action_request_get",
"pollAfterSeconds": 5
},
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"
}
{
"data": {
"resultId": "b3caf96f-5f2a-4619-832c-a12c0d57f78b",
"operation": "subtitles_translate",
"createdAt": 1792152000000,
"fileName": "voicecheap-subtitles_translate-b3caf96f-5f2a-4619-832c-a12c0d57f78b.json",
"byteLength": 365,
"contentType": "application/json; charset=utf-8",
"status": "completed",
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"getAction": "subtitles_result_get",
"downloadAction": "subtitles_result_download",
"listAction": "subtitles_result_list"
},
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"
}
{
"data": {
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"operation": "subtitles_translate",
"createdAt": 1792144800000,
"updatedAt": 1792144820000,
"status": "running",
"pollAfterSeconds": 5
},
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"
}
{
"data": {
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"operation": "subtitles_translate",
"createdAt": 1792144800000,
"updatedAt": 1792144820000,
"status": "completed",
"resultStored": false,
"message": "The action completed. Retrieve its output from the corresponding history or resource action."
},
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"
}
Result fields
| Field | Description |
|---|---|
data.resultId | Owned saved-output UUID. Use it with getAction or downloadAction; it is distinct from requestId and any historyId. |
data.operation | Generation action that produced this saved JSON. |
data.createdAt | Unix timestamp in milliseconds when the saved output was prepared. |
data.fileName | Suggested filename for a JSON export. |
data.byteLength | UTF-8 bytes of the complete serialized output, not the compact metadata. |
data.contentType | application/json; charset=utf-8. |
data.status | completed on successful generation. Result history can also expose pending recovery entries. |
data.requestId | Original action request UUID when recorded. |
data.getAction | Owned retrieval action; includeContent defaults to false and must be true for complete structured output. |
data.downloadAction | Authenticated export action returning full JSON as a content string. |
data.listAction | Owned saved-output listing action for this permission domain. |
Recover and poll this request
Use the same identifier even after a lost connection. If resultStored is false, retrieve the output through the corresponding history, result, or download action. Never start a second generation merely to check progress.curl --request POST 'https://api.voicecheap.ai/v1/actions/action_request_get' \
--header "x-api-key: $VOICECHEAP_API_KEY" \
--header 'Content-Type: application/json' \
--data '{"requestId":"13579bdf-2468-4ace-8bdf-0123456789ab","operation":"subtitles_translate"}'
HTTP 200
{
"data": {
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"operation": "subtitles_translate",
"status": "completed",
"createdAt": 1792144800000,
"updatedAt": 1792144820000,
"resultStored": true,
"result": {
"resultId": "b3caf96f-5f2a-4619-832c-a12c0d57f78b",
"operation": "subtitles_translate",
"createdAt": 1792152000000,
"fileName": "voicecheap-subtitles_translate-b3caf96f-5f2a-4619-832c-a12c0d57f78b.json",
"byteLength": 365,
"contentType": "application/json; charset=utf-8",
"status": "completed",
"requestId": "13579bdf-2468-4ace-8bdf-0123456789ab",
"getAction": "subtitles_result_get",
"downloadAction": "subtitles_result_download",
"listAction": "subtitles_result_list"
}
}
}
Operation notes
- Requires a paid subscription and the action permission. The actor’s personal tool plan is rechecked at execution; saved tools and upload references belong to that actor, including when the credential is associated with a team.
- A successful action uses one shared monthly API/MCP call. Beginner allows 500, Starter 5,000 and Creator 25,000 calls/month; Pro, Scale and Enterprise have no monthly ceiling. Per-minute limits still apply: 30, 60, 120, 180, 300 and 600 respectively. Tool generation allowances are separate.
- Use a UUID v4 requestId, or an identical Idempotency-Key header, and retain the same action, ID and arguments on retries. A cached replay does not use another monthly call.
- This is an asynchronous action. The initial transport result is a running request with pollAction; poll action_request_get with this operation and the original requestId. The completed operation result shown here is a compact saved-output reference, not the generated body.
- Complete output is saved under authenticated ownership in encrypted storage independently of the bounded action polling cache. Call the returned getAction with resultId and includeContent: true for structured JSON, or downloadAction with resultId for JSON text. listAction provides a recovery route when only the original request is known.
- The saved JSON is limited to 32 MiB. Metadata never exposes its storage encryption key or an unauthenticated transcript download URL.
- Successful generation settles one personal tool allowance. Failed generation normally releases its tool reservation. When output persistence is uncertain, inspect the same request and saved-result history before generating again; the server retains the reservation to prevent duplicate usage.
- Higher plans without a monthly integration ceiling still have the tool-specific daily allowances and media limits below. These standalone actions use their tool allowance rather than dubbing minutes or TTS characters.
- Supply UTF-8 SRT or VTT text up to 2 MiB. format can be srt or vtt; when omitted, format is inferred from content or filename. targetLanguage is required; sourceLanguage defaults to automatic detection.
- Output preserves source cue timing and the selected SRT/VTT format. characterCount counts source cue-text characters, not output bytes. The normalised fileName describes the subtitle file rather than the outer saved JSON.
- Daily allowance per tool: Beginner 5, Starter 15, Creator 30, Pro 60, Scale 100 and Enterprise 100 successful generations. It is shared with the corresponding web tool and uses the account tool reset window.
- Subtitle translation history saving is best effort; use the saved integration result for complete-content recovery. This action does not consume an uploaded media source.
Usage
Each successful invocation consumes one monthly API/MCP call. Media credits and the operation’s own generation allowances also apply.Errors
| HTTP status | Code | Meaning or recovery |
|---|---|---|
| 400 | CREDENTIAL_IN_QUERY | Credentials were supplied in an access_token or api_key query parameter. Send credentials in headers. |
| 400 | IDEMPOTENCY_CONFLICT | The header and body request IDs differ. |
| 400 | INVALID_REQUEST_ID | requestId or Idempotency-Key is not a UUID v4. |
| 400 | SUBTITLE_CONTENT_REQUIRED | Subtitle content contains no text. |
| 400 | SUBTITLE_EMPTY | No cue containing subtitle text was found. |
| 400 | SUBTITLE_FILE_TOO_LARGE | UTF-8 subtitle input exceeds 2 MiB. |
| 400 | SUBTITLE_INVALID_SRT | SRT cue structure is invalid. |
| 400 | SUBTITLE_INVALID_SRT_TIMESTAMP | An SRT timestamp cannot be parsed. |
| 400 | SUBTITLE_INVALID_SRT_TIMING | SRT cue timing is invalid. |
| 400 | SUBTITLE_INVALID_VTT | VTT content lacks a valid WEBVTT header. |
| 400 | SUBTITLE_INVALID_VTT_TIMESTAMP | A VTT timestamp cannot be parsed. |
| 400 | SUBTITLE_INVALID_VTT_TIMING | A VTT timing line is invalid. |
| 400 | SUBTITLE_TRANSLATOR_SAME_LANGUAGE | The normalized source and target languages are identical. |
| 400 | SUBTITLE_TRANSLATOR_TARGET_LANGUAGE_REQUIRED | A usable target language was not supplied. |
| 400 | SUBTITLE_UNSUPPORTED_VTT_BLOCK | The VTT file contains a block the translator cannot preserve. |
| 400 | VALIDATION_ERROR | Arguments do not satisfy the action schema, or an unknown argument was supplied. |
| 401 | API_KEY_EXPIRED | The API key has expired. |
| 401 | INVALID_API_KEY | Provide a valid, unexpired API key. |
| 401 | INVALID_CREDENTIAL | The Authorization header is malformed or conflicts with x-api-key. |
| 401 | MISSING_CREDENTIAL | No usable header credential was supplied, or it exceeded 4096 characters. |
| 401 | USER_NOT_FOUND | The credential’s account no longer exists. |
| 403 | ACCOUNT_UNAVAILABLE | The acting or billing account is unavailable or being deleted. |
| 403 | AMBIGUOUS_TEAM_API_KEY | The credential’s user belongs to more than one team, so the billing context is ambiguous. |
| 403 | INSUFFICIENT_SCOPE | The API key or MCP connection lacks the required action permission. |
| 403 | INTEGRATION_PLAN_UNSUPPORTED | The account’s integration limits could not be verified. |
| 403 | PAID_SUBSCRIPTION_REQUIRED | The authenticated actor no longer has a paid subscription when this tool action executes. |
| 403 | SUBSCRIPTION_REQUIRED | Use an active paid subscription. |
| 403 | TEAM_OWNER_NOT_FOUND | The effective team owner account could not be found. |
| 409 | CONCURRENT_ACTION_LIMIT_REACHED | This account already has 10 integration actions running. Poll an existing request before starting another. |
| 409 | IDEMPOTENCY_CONFLICT | Reuse an identifier only with the same operation and arguments. |
| 410 | TOOL_RESULT_ACCOUNT_UNAVAILABLE | The actor account is being deleted or no longer exists, so a durable result cannot be saved. |
| 413 | TOOL_RESULT_TOO_LARGE | Complete generated JSON exceeds 32 MiB and cannot be saved as an integration result. |
| 429 | INTEGRATION_MONTHLY_LIMIT_REACHED | Used and pending calls have reached the shared monthly API/MCP allowance. |
| 429 | INTEGRATION_RATE_LIMIT_REACHED | The account has reached its per-minute integration limit; inspect retryAfterSeconds. |
| 429 | SUBTITLE_TRANSLATOR_TOOL_DAILY_LIMIT_REACHED | The actor has exhausted the subtitle-translator daily allowance. |
| 500 | INTERNAL_ERROR | Check saved request state and resource history before deciding to retry a mutation. |
| 502 | INTERNAL_ERROR | Generation or output saving failed. Check the original request and saved-result history before starting another generation. |
| 503 | ACTION_RESULT_UNAVAILABLE | The action ran but request-result persistence could not be confirmed. Poll the same action and requestId and inspect resource history before starting another write. |
| 503 | INTERNAL_ERROR | The generation or saved-result persistence outcome is uncertain or temporarily unavailable; use authenticated result recovery before generating again. |
| 503 | SERVER_RESTARTING | The server is restarting. Retry shortly and keep the same request identifier for a mutation. |
{
"code": "INSUFFICIENT_SCOPE",
"message": "This credential does not permit the requested action.",
"status": 403,
"details": {
"requiredScopes": ["subtitles:write"]
}
}
Was this page helpful?

