ForgeMesh TTS Custom Long-Form Text-to-Speech

x402

ForgeMesh TTS Custom Long-Form Text-to-Speech is a paid API for AI agents from tts.forgemesh.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Converts long-form text (501–2000 characters) into 44.1kHz WAV audio with configurable voice, speed, and quality across 31 languages, paid via x402.

Price / call$0.01

Seller volume →—

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 44.1kHz 16-bit mono WAV audio file inline (Content-Type: audio/wav) containing the synthesized speech of the submitted text, ready for playback or further processing.

Example use cases

Multilingual e-learning narration

“Read this 700-character Spanish lesson script aloud using voice F2 in Spanish at a slow pace (speed 0.7) with high quality (16 steps) so students can follow along clearly.”

Podcast episode voiceover

“Generate a voiceover for this 1500-character podcast intro using the 'Anchor' voice in English at fast speed and ultra quality (24 steps) — I need it to sound punchy and professional.”

Localized product announcement audio

“Convert this 900-character Japanese product announcement into speech using the M3 voice in Japanese at normal speed and standard quality (8 steps) for our Tokyo launch video.”

Technical details

Endpoint

POSThttps://tts.forgemesh.io/v1/tts/custom-long

When to prefer

Choose this endpoint when you need to synthesize longer passages of 501–2000 characters with fine-grained control over voice persona, speed, and quality. Prefer it over standard TTS routes for editorial content, narration, voiceovers, or multilingual audio where expressive control matters. It requires no API key (payments via x402/USDC) and returns a ready-to-use WAV file, making it ideal for agent workflows that need audio without credential management overhead.

Side effects

Text shorter than 501 characters — use non-long routes instead
Text exceeding 2000 characters — truncation or rejection
Unsupported language code — enum validation error
Invalid speed value outside 0.7–2.0 range — validation error
Persona voices (Storyteller, Narrator, etc.) may require Custom tier — tier error
Payment failure via x402 — 402 response if USDC payment not processed
High steps values (e.g. ultra 24+) may increase latency noticeably

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	Voice name. Standard voices M1-M5/F1-F5; persona voices require Custom tier.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "description": "44.1kHz 16-bit mono WAV speech audio returned inline",
    "content_type": "audio/wav"
  }
}

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Example use cases

Multilingual e-learning narration

“Read this 700-character Spanish lesson script aloud using voice F2 in Spanish at a slow pace (speed 0.7) with high quality (16 steps) so students can follow along clearly.”

Podcast episode voiceover

“Generate a voiceover for this 1500-character podcast intro using the 'Anchor' voice in English at fast speed and ultra quality (24 steps) — I need it to sound punchy and professional.”

Localized product announcement audio

“Convert this 900-character Japanese product announcement into speech using the M3 voice in Japanese at normal speed and standard quality (8 steps) for our Tokyo launch video.”

Technical details

Endpoint

POSThttps://tts.forgemesh.io/v1/tts/custom-long

When to prefer

Side effects

Text shorter than 501 characters — use non-long routes instead
Text exceeding 2000 characters — truncation or rejection
Unsupported language code — enum validation error
Invalid speed value outside 0.7–2.0 range — validation error
Persona voices (Storyteller, Narrator, etc.) may require Custom tier — tier error
Payment failure via x402 — 402 response if USDC payment not processed
High steps values (e.g. ultra 24+) may increase latency noticeably

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	Voice name. Standard voices M1-M5/F1-F5; persona voices require Custom tier.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "description": "44.1kHz 16-bit mono WAV speech audio returned inline",
    "content_type": "audio/wav"
  }
}