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ForgeMesh TTS Pro Long – Text-to-Speech (501–2000 chars)
x402
ForgeMesh TTS Pro Long – Text-to-Speech (501–2000 chars) is a paid API for AI agents from tts.forgemesh.io, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-14).
Converts long-form text (up to 2000 characters) into 44.1kHz WAV audio across 31 languages with configurable voice, speed, and quality steps, paid via x402 micropayment.
Price / call$0.006
Success—
StatusUnknown
How this service works
Paid text-to-speech via x402. WAV audio in 31 languages, OpenAI-compatible, no API keys.
Output
Returns a binary WAV audio file (audio/wav content type) encoded at 44.1kHz, 16-bit, mono. The file contains the synthesized speech of the submitted text in the chosen language, voice, speed, and quality level, ready for playback or embedding.
Example use cases
Multilingual e-learning narration
“Convert this 1200-character Spanish lesson summary into spoken audio using a male voice (M3) at normal speed (1.0) and standard quality (8 steps) — I need a WAV file to embed in our course module.”
Podcast intro script voiceover
“Generate a voiceover for my 900-character podcast intro in English with voice F1, speed set to 1.3 for a lively feel, and quality at 16 steps so it sounds polished.”
Automated customer announcement in Japanese
“Turn this 700-character Japanese store closing announcement into speech using voice M2, slow speed (0.7) so it's easy to understand, and draft quality (4 steps) for a quick review before we finalize it.”
Technical details
Endpoint
POSThttps://tts.forgemesh.io/v1/tts/pro-longWhen to prefer
Choose this endpoint when you need to synthesize longer text (501–2000 characters) into high-quality WAV audio without managing API keys, when you need fine-grained control over voice gender, speed, and quality steps, or when you need multilingual support across 31 languages in a single service. Prefer this over shorter-text TTS routes when your input exceeds 500 characters. It is ideal for agents that pay per-call via x402 micropayments and need OpenAI-compatible audio generation without a subscription.
Side effects
- Text exceeds 2000 character limit — use a shorter input or split the text
- Unsupported language code — must be one of the 31 supported ISO codes
- Invalid voice ID — must be M1–M5 or F1–F5
- Speed out of range — must be between 0.7 and 2.0
- Steps out of range — must be between 1 and 100
- Payment failure via x402 — insufficient USDC balance or wallet misconfiguration
- Empty or missing text field — minLength of 1 character required
- Service timeout for very high step counts (e.g. steps=100) on long text
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| lang | string | Language code; 31 languages supported |
| text | string | Text to synthesize into speech, max 2000 characters. Use non-long routes for 1-500 chars and -long routes for 501-2000 chars. |
| speed | number | Pro/Custom expressive speed control, 0.7-2.0. Presets: slow 0.7, normal 1.0, fast 1.3, rapid 1.6 |
| steps | integer | Pro/Custom quality control, 1-100. Presets: draft 4, standard 8, high 16, ultra 24 |
| voice | string | Standard voice: M1-M5 or F1-F5 |
Output
Schema · Response
{
"type": "json",
"example": {
"description": "44.1kHz 16-bit mono WAV speech audio returned inline",
"content_type": "audio/wav"
}
}Tags
x402
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