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ForgeMesh Voice Batch Long-Form TTS
x402
ForgeMesh Voice Batch Long-Form TTS is a paid API for AI agents from voice.forgemesh.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Converts a batch of up to 20 text items into spoken audio using persona voices across 31 languages, returning base64-encoded WAV audio for each item.
Price / call$0.005
Success—
StatusUnknown
How this service works
Batch text-to-speech: synthesize up to 20 text items in a single call, standard voices only, for 501-2000 total characters, returns JSON with base64 WAV audio plus duration and sample rate per item. Use it to: batch-voice a longer set of messages, produce audio for a multi-section script or FAQ, generate several paragraph-length voice clips in one request without repeated calls. USDC on Base via x402.
Output
A JSON object containing an array of items, each with a base64-encoded WAV audio string, the audio duration in seconds, and the audio format label — one result per input text item.
Example use cases
Example prompt
“Convert these 5 chapter summaries to speech using a warm male narrator voice in English and send back the audio: [chapter text 1], [chapter text 2], [chapter text 3], [chapter text 4], [chapter text 5].”
Technical details
Endpoint
POSThttps://voice.forgemesh.io/v1/tts/batch-longWhen to prefer
Choose this endpoint when you need to synthesize multiple distinct text passages in a single API call (up to 20 items), especially for long-form content like book chapters, video scripts, or batched agent responses. Prefer this over single-item TTS endpoints when throughput efficiency matters and you want to minimize per-request overhead across many texts. Best suited for batch pipeline workflows where audio is consumed asynchronously.
Side effects
- More than 20 items submitted — batch limit exceeded
- Unsupported language code — returns error for unrecognized lang value
- Invalid or non-base voice specified — persona voices not accepted in batch-long endpoint
- Payment failure via x402 — call not processed if USDC payment is rejected
- Empty text items — may return zero-duration audio or validation error
- Malformed items array — missing required text field causes schema validation failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| items | array | Array of standard-voice text items. Total text across all items must be <= 2000 characters; use /v1/tts/batch for <=500 total chars and /v1/tts/batch-long for 501-2000 total chars. |
| defaults | object | Default standard voice and language for all items |
Output
Schema · Response
{
"type": "json",
"example": {
"items": [
{
"format": "wav",
"duration_s": 1.5,
"sample_rate": 44100,
"audio_base64": "..."
}
]
}
}Tags
x402
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