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Neurodynamic TTS – Kokoro English Speech Synthesis
x402
Neurodynamic TTS – Kokoro English Speech Synthesis is a paid API for AI agents from api.neurodynamic.tech, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Converts up to 1,000 characters of English text into an MP3 audio file using one of seven Kokoro voices, settled via 0.005 USDC on Base.
Price / call$0.005
Success—
StatusUnknown
How this service works
Introductory pricing. Catalogue narration: 0.005 USDC on Base, up to 1,000 characters, MP3. Seven English voices. No account, reference upload or human approval. Read https://api.neurodynamic.tech/narration. Authorisation verified before work; settlement after successful audio. Retry identical body and proof for one hour without a second charge. Quoted tier price: 0.005 USDC.
Output
A raw MP3 binary (audio/mpeg) containing the synthesized speech of the submitted text, ready to save or stream directly. No metadata envelope — just the audio bytes.
Example use cases
Catalogue product narration
“Turn this product blurb into spoken audio using the bf_emma voice so I can embed it on the product page: 'Handcrafted leather wallet, slim profile, six card slots, available in tan and black.'”
Podcast intro voiceover
“Generate an MP3 of this podcast intro using the bm_george voice: 'Welcome to TechBrief — your daily three-minute digest of the biggest stories in technology.'”
Accessibility audio for article
“Convert this article summary into an MP3 using the am_michael voice: 'Scientists have discovered a new coral reef ecosystem off the coast of Tahiti, untouched by bleaching events.'”
Technical details
Endpoint
POSThttps://api.neurodynamic.tech/v1/audio/speechWhen to prefer
Choose this endpoint when you need quick, low-cost English TTS with no account setup, no reference audio upload, and no human approval step. It is ideal for agents that need to generate short narrations on demand and can settle micropayments in USDC on Base. Prefer it over larger TTS platforms when cost per call matters and the content fits within 1,000 characters. If you need voice cloning or WAV output, consider the sibling clone-speech endpoint on the same host.
Side effects
- Text exceeds 1,000 characters — request rejected before audio is generated
- Payment proof invalid or expired — 401/402 response, no charge incurred
- Unsupported voice or model value — validation error returned
- Network timeout before audio delivery — retry with identical body and proof within one hour at no extra charge
- Base blockchain congestion causing payment settlement delay
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | |
| model | — | |
| speed | — | |
| voice | string | |
| stream | — | |
| response_format | — |
Output
Schema · Response
{
"type": "binary",
"format": "audio/mpeg",
"example": "<MP3 bytes>"
}Tags
x402
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Zero review prompt (fires after every successful call)
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