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FetchHarbor TTS – Private English Speech Synthesis
x402
FetchHarbor TTS – Private English Speech Synthesis is a paid API for AI agents from fetchharbor.benlab.download, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-15).
Converts English text (up to 2000 characters) into WAV audio using a fixed set of local voices, returning base64-encoded audio without retaining or logging the input.
Price / call$0.04
Success—
StatusUnknown
How this service works
Generate private, locally processed English speech from bounded text. Returns WAV audio as base64 JSON, uses a fixed voice allowlist, and does not retain or log submitted text.
Output
A JSON object containing the generated speech as a base64-encoded WAV audio string. The audio represents the submitted English text spoken by the chosen voice at the specified speed. No input text is retained or logged by the server.
Example use cases
Private narration for sensitive documents
“Convert this confidential meeting summary to speech using the am_michael voice at 0.9x speed — I need a WAV file and don't want the text stored anywhere: 'Q3 results show a 12% margin decline driven by supply chain costs.'”
Podcast-style audio from blog post
“Turn this blog intro into spoken audio with the af_heart voice at 1.1 speed: 'Artificial intelligence is reshaping how we work, communicate, and create. In this post, we explore five real-world applications changing industries today.'”
Voiceover for accessibility feature
“Generate a WAV audio clip of this UI tooltip text using the am_adam voice at normal speed: 'Click here to save your progress. Your changes will be stored automatically every five minutes.'”
Technical details
Endpoint
POSThttps://fetchharbor.benlab.download/v1/audio/speechWhen to prefer
Choose this endpoint when privacy is paramount and you need local, non-logging TTS for English text. It is ideal for sensitive or confidential content where cloud-based TTS services that retain data are unacceptable. It is also appropriate when you need WAV output specifically and want a fixed, predictable voice set rather than a large voice catalogue. Prefer this over OpenAI TTS or ElevenLabs when data residency and zero-logging guarantees matter more than voice variety.
Side effects
- Text exceeds 2000 character limit — request rejected with validation error
- Voice value not in allowlist (af_sarah, af_heart, am_adam, am_michael) — returns error
- Speed outside 0.75–1.25 range — validation failure
- Non-English or unsupported language input may produce degraded or garbled audio
- Empty input string — returns validation error
- Malformed JSON body — returns 400 bad request
- Service unavailable or local model failure — returns 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | |
| speed | number | |
| voice | string | |
| response_format | string |
Tags
x402
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