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Onchain Router – Text-to-Speech (ElevenLabs Flash v2.5)
x402
Onchain Router – Text-to-Speech (ElevenLabs Flash v2.5) is a paid API for AI agents from llm.agenticfi.wtf, paid per call via x402, $0.002/call, status down (last checked 2026-09-15).
Converts text input to MP3 audio using ElevenLabs Flash v2.5, routed through a provider-neutral API with per-request USDC micropayment and durable on-chain receipt.
Price / call$0.002
Success—
StatusDown
How this service works
Text-to-speech generation · 24-hour encrypted capability URL · 0% service fee launch promotion
Output
Returns a JSON object containing a speech ID, a time-limited signed URL pointing to the generated MP3 audio file, the model used, and a character usage count. The agent can pass the URL to a media player or downstream pipeline.
Example use cases
Podcast narration from script
“Turn this script into a spoken MP3 using the 'florence' voice at 1.0 speed: 'Today on TechBrief, we cover the latest in AI hardware, open-source breakthroughs, and startup funding rounds.'”
Accessibility audio for article
“Generate an audio version of this article intro in the 'alicia' voice so visually impaired readers can listen: 'Climate scientists released a new report today showing a record decline in Arctic sea ice for the third consecutive year.'”
Voiceover for product demo
“Synthesize a voiceover using the 'baxter' voice at 0.9 speed for our product demo: 'Onchain Router lets you call any AI model and pay only for what you use, with a receipt stored on-chain every time.'”
Technical details
Endpoint
POSThttps://llm.agenticfi.wtf/v1/audio/speechWhen to prefer
Choose this endpoint when you need reliable, low-latency ElevenLabs-quality TTS with a specific named voice, want to pay per request in USDC without a monthly subscription, or require an auditable on-chain payment receipt. Prefer it over direct ElevenLabs API calls when operating in a crypto-native or agent payment infrastructure using x402. Not suited for batch processing of large documents or streaming real-time audio.
Side effects
- Input text exceeds 2000 characters — validation error returned
- Speed value outside 0.7–1.2 range or not a multiple of 0.001 — schema validation failure
- Invalid voice alias not in enum — rejected at input validation
- Insufficient USDC balance for micropayment — 402 Payment Required before processing
- Audio URL may expire after a short TTL — agent must retrieve or cache promptly
- Model enum mismatch if additional models added later — currently only 'elevenlabs/flash-v2.5' supported
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | |
| model | string | |
| speed | number | |
| voice | string | Optional public alias; omission uses the selected model's default voice. |
| response_format | string |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "spch_example",
"data": [
{
"url": "https://llm.agenticfi.wtf/v1/media/audio/example?access=capability"
}
],
"model": "elevenlabs/flash-v2.5",
"usage": {
"input_characters": 19
}
}
}Tags
x402
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