WithZero Grok Voice Speech Synthesis via ZeroClick

x402

WithZero Grok Voice Speech Synthesis via ZeroClick is a paid API for AI agents from agents.withzero.xyz, paid per call via MPP or x402, $0.08/call, not verified (last probed 2026-10-29); live alternatives: x402engine ElevenLabs Text-to-Speech ($0.02) and Google Gemini 3.1 Flash TTS ($0.0028).

Agents call it through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5. Live alternatives for the same use case: x402engine ElevenLabs Text-to-Speech ($0.02) · Google Gemini 3.1 Flash TTS ($0.0028).

Converts text to speech audio using Grok Voice model via a pay-per-use proxy, requiring no vendor account or API keys.

Price / call$0.08session · ~$0.08 to open

Seller volume →—

Success50%

StatusUnknown

How this service works

Convert text to natural-sounding speech with xAI's Grok Voice and return a hosted audio URL.

Output

An audio file or audio stream containing the synthesized speech of the provided text, spoken in the Grok Voice model's voice. The response is the rendered audio data returned from the WithZero API via the ZeroClick proxy.

Example use cases

Narrate a blog post as audio

“Take this blog post intro and convert it to speech using Grok Voice: 'Artificial intelligence is reshaping how we work, create, and communicate. Here's what you need to know for 2025.'”

Generate podcast intro voiceover

“Create a spoken audio clip from this podcast intro script using Grok Voice: 'Hey everyone, welcome back to The Future Forward podcast. I'm your host, and today we're diving deep into autonomous AI agents.'”

Produce accessibility audio for article

“Convert this article summary into audio so visually impaired users can listen to it — use Grok Voice to synthesize: 'Our new product launches next month with three pricing tiers designed for teams of all sizes.'”

Technical details

Endpoint

POSThttps://agents.withzero.xyz/api/v1/audio/speech/grok-voice?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need text-to-speech synthesis using the Grok Voice model specifically, without needing your own API keys or accounts. Ideal for autonomous AI agents that can pay per call in USDC via x402. Prefer over alternatives when the Grok Voice model quality or style is specifically desired, or when avoiding vendor account setup is important.

Side effects

Missing required 'input' body field returns a validation error
Empty or malformed text body may result in an empty or error audio response
Payment failure (insufficient USDC balance) blocks the request before synthesis
Grok Voice model unavailability causes upstream 5xx errors propagated through the proxy
Incorrect bodyType (not json/form-data/text) causes request rejection
Rate limiting or quota exceeded from the upstream WithZero API

Input

Schema · Request body

Field	Type	Description
text	string
inputrequired	string	The text to convert to speech (1–4000 characters).
voicerequired	string	Voice to speak with. Defaults to "default".

Output

Schema · Response

Field	Type	Description
urlrequired	string	Hosted URL of the generated audio (WAV, 24kHz mono).
modelrequired	string	The model that produced the audio.
secondsrequired	number	Approximate duration of the generated audio in seconds.
mimeTyperequired	string	Content type of the generated audio.
sizeBytesrequired	number	Size of the generated audio in bytes.
price_usdcrequired	string	The amount charged for this request, in USDC.

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