{"uid":"cap_DBddXAR2pkwKbuBfUl4hG","slug":"fastapi-online-speech-to-text-stt-d9986abb","name":"fastapi.online Speech-to-Text (STT)","description":"Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.","url":"https://api.fastapi.online/stt?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"file":{"type":"string","format":"binary","description":"Audio file (WAV/MP3/OGG/etc)"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":1,"rating":{"score":"1.00","successRate":"0.67","reviews":1,"stars":"5.0","state":"rated"},"availabilityStatus":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_QTpnYzAwWcnTcgrnrlwav","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Transcribes audio files (WAV, MP3, OGG, etc.) to text with language detection, timestamps, and segment-level detail, paid per call via crypto.","exampleAgentPrompt":"Can you transcribe this audio file for me — it's an MP3 of a recorded meeting — and tell me what language it's in and break it down into segments?","exampleUseCases":[{"title":"Meeting recording transcription","prompt":"I have a WAV recording of our team standup from this morning — can you transcribe it to text and give me the segments with timestamps so I can turn it into meeting notes?"},{"title":"Multilingual podcast content extraction","prompt":"I've got an MP3 of a podcast episode that might be in Spanish or Portuguese — can you transcribe it and tell me what language it's in so I can route it to the right editor?"},{"title":"Voice memo to text for mobile app","prompt":"Here's an OGG voice memo a user sent — can you run speech-to-text on it and give me the full transcript and how long the audio is?"}],"resultDescription":"Returns a JSON object with the full transcribed text string, the detected language code, the audio duration in seconds, the name of the engine used, and an array of timestamped segments for fine-grained alignment.","failureModes":["Unsupported audio format returns an error — stick to WAV, MP3, OGG, or other common formats","Very long audio files may time out or be rejected if they exceed size limits","Payment failure or insufficient USDC balance returns a 402 error before processing","Corrupted or silent audio files may return empty text or fail engine-side","Low-quality or noisy audio may produce inaccurate transcripts with no error signal"],"whenToPreferThis":"Choose this endpoint when you need no-signup, pay-per-call speech-to-text with crypto (USDC) and want segment-level timestamps and automatic language detection in a single call. It's ideal for agents operating without a pre-registered account, processing sporadic audio jobs, or needing a self-hosted alternative to cloud STT providers like Whisper API or Google Speech-to-Text.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":3,"lastUsedAt":"2026-08-13T21:25:44.550Z","lastSuccessfullyRanAt":"2026-08-13T21:25:44.550Z","lastHealthCheckAt":"2026-10-12T21:26:52.626Z","isFirstParty":false,"canonicalSlug":"fastapi-online-speech-to-text-stt-d9986abb"}