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x402 Shop — Text-to-Speech (TTS) via Kokoro-82M · USDC on Base
x402
x402 Shop — Text-to-Speech (TTS) via Kokoro-82M · USDC on Base is a paid API for AI agents from x402.stan01.xyz, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Synthesizes natural-sounding MP3 audio from input text using the Kokoro-82M model, billed per job in USDC on Base via x402.
Price / call$0.01
Success—
StatusDown
How this service works
Pay-per-use ASR and TTS for AI agents. ASR: send a podcast feed (RSS) or any audio URL, get back a clean timestamped transcript, optionally plus an AI synthesis (thesis, keypoints, verbatim quotes, takeaways). Modes: synthesis or transcript. TTS: text in -> synthesized mp3 out (Kokoro-82M). Exact USDC price quoted in the 402 challenge; pay per job on Base.
Output
Returns a JSON object with a job_id (UUID) and a status field (e.g. 'running'), indicating the TTS job has been queued. The agent would poll or retrieve the completed MP3 once the job finishes.
Example use cases
Podcast narration from article text
“Turn this 2,000-character blog post into an MP3 narration using the default Kokoro voice at speed 1 — I want to add it as an audio version of the article.”
Accessibility audio for written content
“I have a plain-text transcript at https://example.com/transcript.txt — it's about 4500 characters. Can you synthesize it into speech using the af_heart voice so visually impaired users can listen to it?”
Custom-speed voiceover for a demo
“Synthesize this short product walkthrough script into audio at 1.5x speed using a Kokoro voice: 'This is how you set up your account in three easy steps.'”
Technical details
Endpoint
POSThttps://x402.stan01.xyz/v1/terminal/ttsWhen to prefer
Choose this endpoint when you need pay-per-use, per-job TTS synthesis using the Kokoro-82M model and want to pay in USDC on Base with no subscription — ideal for AI agents that need occasional or bursty audio generation without committing to a recurring API plan. Prefer it over general TTS APIs when the x402 micropayment flow fits your agent architecture.
Side effects
- Missing required text or text_url field — returns validation error
- chars estimate missing when text_url is provided — required for pricing/quoting
- Speed value out of range (below 0.5 or above 2) — rejected with validation error
- Invalid or unreachable text_url — job may fail or timeout
- Payment challenge not met — 402 returned until USDC payment on Base is completed
- Unknown or unsupported voice name — may fall back to default or return error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Inline text to synthesize |
| chars | integer | Estimated char count for text_url (required for URL input) |
| speed | number | |
| voice | string | Kokoro voice, e.g. af_heart (default) |
| text_url | string | https URL to a text file (requires "chars" estimate) |
Output
Schema · Response
{
"type": "json",
"example": {
"job_id": "00000000-0000-0000-0000-000000000000",
"status": "running"
}
}Tags
x402
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