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ElevenLabs Text-to-Speech via tokens.fun
x402
ElevenLabs Text-to-Speech via tokens.fun is a paid API for AI agents from tts-service-production-e8a7.up.railway.app, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).
Converts input text (up to 4000 characters) to speech audio using ElevenLabs, returning a hosted audio URL or streamable raw audio bytes.
Price / call$0.03
Success—
StatusUnknown
How this service works
ElevenLabs text-to-speech: send text (up to 4000 chars) with optional voice_id, model, format, and speed; get back a hosted audio_url plus size and content type. Send 'Accept: audio/mpeg' to stream raw audio bytes directly instead. Voice catalog with free preview clips at GET /voices (no payment). Priced per character; the 402 amount is computed from your text length.
Output
Returns a JSON object containing a hosted audio_url (publicly accessible link to the generated audio file), the file size in bytes, and the content type (e.g. audio/mpeg). If the Accept header is set to audio/mpeg, raw audio bytes are streamed directly instead.
Example use cases
Voiceover for product demo video
“Turn this product description into a voiceover using ElevenLabs — a professional-sounding female voice at normal speed, and give me the hosted audio URL: 'Introducing FlowDesk, the all-in-one workspace for modern teams. Collaborate, plan, and ship faster than ever before.'”
Podcast narration from blog post
“Convert this blog post excerpt into speech audio I can use in my podcast — use the eleven_flash_v2_5 model and send it back as an mp3 link: 'Artificial intelligence is reshaping how we build software. In this post, we explore five tools every developer should know in 2025.'”
Accessibility audio version of article
“Read this article section aloud and give me a hosted audio file link so I can add an audio version to my website: 'Climate change is accelerating at an unprecedented rate, with global temperatures rising 1.2 degrees Celsius above pre-industrial levels.'”
Technical details
Endpoint
POSThttps://tts-service-production-e8a7.up.railway.app/speakWhen to prefer
Choose this endpoint when you need to convert text to speech via ElevenLabs and want a simple hosted audio URL back without managing ElevenLabs API keys directly. It is ideal for agents that need to pay per-use with USDC via x402 protocol, require a publicly accessible audio link, or want to optionally stream raw audio bytes. Prefer this over direct ElevenLabs API calls when operating in a pay-per-call agent context without long-term API subscriptions.
Side effects
- Text exceeds 4000 characters — request rejected with error
- Invalid voice_id — falls back to default voice or returns error
- Invalid model ID — returns error referencing valid models from /voices
- Payment required (402) if x402 payment header is missing or insufficient — amount computed from text length
- Unsupported audio format string — returns format error
- Speed value outside 0.7–1.2 range — returns validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Text to synthesize into speech. Max 4000 characters. |
| model | string | TTS model id from GET /voices. Optional, default eleven_flash_v2_5. |
| speed | number | Playback speed 0.7-1.2. Optional, default 1. |
| format | string | Output audio format. Optional, default mp3_44100_128. |
| voice_id | string | ElevenLabs voice id from GET /voices. Optional; a default voice is used if omitted. |
Tags
x402
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