{"uid":"cap_DksTwKcLiC-Bl5Sn4uVOq","slug":"delx-commerce-audio-transcription-api-97f955b4","name":"Delx Commerce Audio Transcription API","description":"Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.","url":"https://commerce.delx.ai/api/v1/x402/transcribe-audio?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"audio_base64":{"type":"string","maxLength":2800000,"minLength":1,"description":"One base64-encoded WAV up to 2 MiB decoded and 60 seconds. audio/wav data-URI prefixes are accepted. URLs, file paths, and model/version fields are rejected."}}},"responseSchema":{"type":"json","example":{"text":"hello agents","bytes":12,"model":"vaibhavs10/incredibly-fast-whisper","sha256":"2d6c7c2b3f3c8e1e7b0d3a5b6e7f8a9b1234567890abcdef1234567890abcdef","provider":"replicate","text_url":"https://api.delx.ai/api/v1/generated-transcripts/9c2e1b84f0a14d2e9c8b7a6543210fed.txt","media_type":"text/plain","input_sha256":"34a8815e9c57e321194d50f2ea8b64394019fb8038c9aefd7a9a306a5030fc31","generation_id":"9c2e1b84f0a14d2e9c8b7a6543210fed","sale_price_usdc":0.02,"gross_margin_usd":0.0164,"upstream_cost_usd":0.0036,"provider_prediction_id":"tr-example-prediction"}},"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_1403C_454psj_6jrWwWxO","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 a base64-encoded WAV audio clip (up to 2 MiB / 60 seconds) to text using Whisper, paid per-call in USDC via x402 with no signup required.","exampleAgentPrompt":"Can you transcribe this WAV audio clip for me? Here's the base64-encoded audio data: [base64 string]. Just give me the text of what was said.","exampleUseCases":[{"title":"Transcribe customer support call snippet","prompt":"I have a short WAV recording of a customer support call — here's the base64-encoded audio. Can you transcribe what the customer said so I can log it?"},{"title":"Convert voice memo to meeting notes","prompt":"I recorded a 45-second voice memo as a WAV file. Here's the base64 data — please transcribe it so I can turn it into written meeting notes."},{"title":"Extract spoken content from podcast clip","prompt":"I've clipped a 30-second segment from a podcast as a WAV file and encoded it in base64. Can you transcribe the speech so I can quote it in an article?"}],"resultDescription":"Returns a JSON object containing the full transcribed text string, a hosted URL to the plain-text transcript, a SHA256 hash of the output for verification, the input SHA256, a generation ID, byte count, the model name used (vaibhavs10/incredibly-fast-whisper via Replicate), the sale price in USDC, and upstream cost details.","failureModes":["Audio exceeds 2 MiB decoded or 60 seconds — rejected with validation error","Non-WAV audio format submitted — rejected, only audio/wav accepted","URL or file path submitted instead of base64 data — explicitly rejected","Base64 string malformed or empty — validation error","Payment not provided or insufficient USDC — x402 payment required response","Audio contains no intelligible speech — may return empty or near-empty text"],"whenToPreferThis":"Choose this endpoint when you need a fast, pay-per-use speech-to-text transcription for short WAV clips (under 60 seconds) without any account setup, subscription, or API key management. It is particularly well-suited for AI agent workflows that need verifiable, auditable transcription results with cryptographic delivery proofs and USDC micropayment settlement on Base or Solana.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T01:13:54.236Z","isFirstParty":false,"canonicalSlug":"delx-commerce-audio-transcription-api-97f955b4"}