{"uid":"cap_rNOaiURhCVdJH8ZszaS5m","slug":"fetchharbor-tts-private-english-speech-synthesis-8cd05b51","name":"FetchHarbor TTS – Private English Speech Synthesis","description":"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.","url":"https://fetchharbor.benlab.download/v1/audio/speech","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"input":{"type":"string","maxLength":2000,"minLength":1},"speed":{"type":"number","maximum":1.25,"minimum":0.75},"voice":{"enum":["af_sarah","af_heart","am_adam","am_michael"],"type":"string"},"response_format":{"type":"string","const":"wav"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.04","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.04/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_xjw7NZDTQAFGVEnTIMA-g","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.04","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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.","exampleAgentPrompt":"Read this paragraph aloud using the af_sarah voice at normal speed and give me a WAV file: 'Welcome to our quarterly review. Today we'll cover sales performance, product updates, and the roadmap for next quarter.'","exampleUseCases":[{"title":"Private narration for sensitive documents","prompt":"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.'"},{"title":"Podcast-style audio from blog post","prompt":"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.'"},{"title":"Voiceover for accessibility feature","prompt":"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.'"}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:46:31.095Z","isFirstParty":false}