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x402 AI Tools – Text-to-Speech (Amazon Polly)
x402
x402 AI Tools – Text-to-Speech (Amazon Polly) is a paid API for AI agents from ai.kagurazaka.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Converts text to speech using Amazon Polly and returns a signed URL to the audio file, valid for one hour.
Price / call$0.02
Success—
StatusUnknown
How this service works
Turns text into speech with Amazon Polly and returns a signed URL of the audio, valid for an hour. Up to 3000 characters with standard voices or 1000 with neural ones. Voices include Joanna, Matthew (English), Mizuki, Takumi (Japanese), Lucia (Spanish), Lea (French), Vicki (German) and about 60 more.
Output
A signed HTTPS URL pointing to the generated audio file (mp3 or ogg) hosted on Amazon S3, valid for one hour. The audio contains the synthesized speech rendered by the specified Polly voice and engine.
Example use cases
Accessible audio version of blog post
“Turn this article intro into spoken audio using the Joanna voice in standard mode and send me the mp3 link: 'Artificial intelligence is reshaping how we interact with technology every single day.'”
Japanese product announcement narration
“Synthesize this Japanese text into speech using the Takumi neural voice and return an ogg file link: '本日は新製品をご紹介します。'”
Multilingual customer greeting audio
“Convert this Spanish greeting to audio using the Lucia voice in standard engine and give me an mp3 URL: 'Bienvenido a nuestro servicio de atención al cliente. Estamos aquí para ayudarle.'”
Technical details
Endpoint
POSThttps://ai.kagurazaka.dev/v1/speech?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need quick, pay-per-call text-to-speech synthesis via Amazon Polly without managing AWS credentials or infrastructure. It is ideal for agents that occasionally need audio output in one of ~60 supported voices across multiple languages, and want a ready-to-use signed URL rather than raw audio bytes. Prefer alternatives if you need very long documents, real-time streaming audio, or custom SSML control beyond what Polly's standard API provides.
Side effects
- Text exceeds 3000 characters for standard voices or 1000 for neural voices — request rejected
- Requested voice ID does not exist or is misspelled — error returned
- Requested voice does not support the chosen engine (e.g. neural not available for all voices) — error returned
- Signed URL expires after one hour — audio becomes inaccessible
- Payment of $0.02 USDC not completed — endpoint returns 402 Payment Required
- Unsupported format requested — only mp3 and ogg are valid
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | the text, up to 3000 characters (standard) or 1000 (neural) |
| voice | string | Polly voice id (default Joanna) |
| engine | string | default standard; not every voice has both |
| format | string | default mp3 |
Tags
x402
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