{"uid":"cap_Dpuav2yBR0e0Bf1a7eAhj","slug":"inference402-speech-to-text-transcription-f5508d2e","name":"Inference402 Speech-to-Text Transcription","description":"Pay-per-call AI inference for agents: chat (Llama 3.3 70B / 3.1 8B), structured JSON, summarize, translate (incl. Egyptian Arabic), extract, classify, sentiment, keywords, rewrite, embeddings, moderation, vision and speech-to-text. USDC on Base mainnet over x402. No API key, no account.","url":"https://inference402.worlddata402.workers.dev/v1/audio/transcribe?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"language":{"type":"string","description":"Optional ISO 639-1 spoken-language hint, e.g. ar"},"audio_url":{"type":"string","format":"uri","description":"Public http(s) URL of an audio file ≤10MB"}}},"responseSchema":{"type":"json","example":{"text":"Hello and welcome ...","model":"@cf/openai/whisper-large-v3-turbo","language":"en","segments":[{"end":4.2,"text":"Hello and welcome","start":0}],"word_count":96,"duration_seconds":42.1}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_kBnUx9mVpgI6TELs335LD","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Transcribes audio from a public URL into text with timestamps and word count using Whisper Large v3 Turbo, paid per-call in USDC via x402.","exampleAgentPrompt":"Transcribe this audio recording for me — it's in Arabic and the file is at https://example.com/interview.mp3 — I need the full text with timestamps.","exampleUseCases":[{"title":"Podcast episode transcription","prompt":"Can you transcribe this podcast episode for me? The audio is at https://media.example.com/episode42.mp3 and it's in English — I want the full text and segment timestamps."},{"title":"Multilingual interview transcription","prompt":"I have a recorded interview in Egyptian Arabic at https://storage.example.com/interview.mp3, please transcribe it to text for me with word count and duration."},{"title":"Voice memo to text conversion","prompt":"Turn this voice memo into text — the audio URL is https://files.example.com/memo.wav, it's in English, and I need the timestamped segments so I can find specific parts later."}],"resultDescription":"Returns a JSON object with the full transcribed text, the model used (Whisper Large v3 Turbo), detected or hinted language code, word count, total audio duration in seconds, and an array of timed segments each with start time, end time, and segment text.","failureModes":["Audio file exceeds 10MB limit — request rejected","Audio URL is not publicly accessible or returns 4xx/5xx — fetch failure","Unsupported audio format — transcription fails","Invalid ISO 639-1 language code provided — may cause incorrect transcription","Payment not received or insufficient USDC balance — 402 Payment Required","Transient Cloudflare Workers AI backend error — service unavailable"],"whenToPreferThis":"Choose this endpoint when you need keywordless, no-account, pay-per-call audio transcription billed in USDC via the x402 protocol, especially when you want Whisper-quality results with timed segments without managing API keys or subscriptions. Ideal for AI agents that need to process audio on demand without prior account setup.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T18:19:58.317Z","isFirstParty":false,"canonicalSlug":"inference402-speech-to-text-transcription-f5508d2e"}