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Text-to-Speech Lite (Kokoro-82M)
x402
Text-to-Speech Lite (Kokoro-82M) is a paid API for AI agents from agent402.tools, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Converts text to speech using the Kokoro-82M model at a low cost, returning base64-encoded MP3 or PCM audio
Price / call$0.005
Success—
StatusUnknown
How this service works
Convert text to speech with Kokoro-82M, ten times cheaper than /api/tts. Returns base64-encoded mp3 or pcm. The same request shape and the same ten OpenAI voice names as /api/tts, mapped to Kokoro's own voices; the voice is synthetic-sounding where the OpenAI tiers are not, which is the whole trade. Use this for high-volume narration, notifications and agent speech where the cost per call matters more than the timbre; use /api/tts or /api/tts-hd when it does not.
Output
A JSON object containing: base64-encoded audio data (MP3 or PCM), the character count of the input, the model used (hexgrad/kokoro-82m), the actual Kokoro voice name used, the audio format, and the provider (openrouter).
Example use cases
High-volume agent notification audio
“I need to generate spoken audio for thousands of short notification messages cheaply — use the alloy voice and return MP3s. Here's the first one: 'Your appointment is confirmed for 3pm tomorrow.'”
Automated podcast narration
“Turn this 1800-character article summary into a narrated MP3 using the shimmer voice so I can add it to my podcast feed: 'Scientists have discovered a new species of deep-sea fish…'”
In-app voice alert synthesis
“Generate a PCM audio clip of this alert message using the echo voice for my app's audio playback system: 'Warning: battery level is critically low, please charge your device now.'”
Technical details
Endpoint
POSThttps://agent402.tools/api/tts-liteWhen to prefer
Choose this endpoint when cost per call is the primary concern and you can tolerate a more synthetic-sounding voice. It is ten times cheaper than /api/tts and is best for high-volume use cases such as bulk narration, agent speech, or notification audio where premium voice timbre is not required. Use /api/tts or /api/tts-hd instead when voice naturalness matters more than cost.
Side effects
- Text exceeds 2000 character limit — request rejected
- Invalid voice name supplied — may default or error
- Unsupported audio format requested — only mp3 and pcm supported on this endpoint
- Payment not provided or insufficient (x402 protocol) — 402 response
- OpenRouter upstream unavailability — 502 or timeout
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Text to convert to speech (max 2000 chars) |
| voice | string | Voice: alloy, ash, ballad, coral, echo, fable, nova, onyx, sage, shimmer (default: alloy) - mapped to the nearest Kokoro voice, which is named back in the response |
| format | string | Audio format: mp3 or pcm (default: mp3). The other formats are on /api/tts |
Output
Schema · Response
{
"type": "json",
"example": {
"audio": "<base64-encoded audio>",
"chars": 20,
"model": "hexgrad/kokoro-82m",
"voice": "af_alloy",
"format": "mp3",
"provider": "openrouter"
}
}Tags
x402
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