{"uid":"cap_iVcMCYYdItTSE3m1i-0cq","slug":"automaton-media-apis-youtube-transcript-captions-9f1ec8e2","name":"Automaton Media APIs – YouTube Transcript (Captions)","description":"Pay-per-use APIs for AI agents: YouTube and audio transcription (speech-to-text); Text-to-speech: natural English voices (MP3/WAV); Text-to-image generation; Web scraper: any URL to clean Markdown; YouTube transcript (captions, instant). Pay each request with USDC via x402 on Base - no signup, no API key.","url":"https://api.language123.net/v1/youtube-transcript?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string","description":"Video URL with captions (YouTube watch/shorts/youtu.be links, or another site yt-dlp supports)"},"format":{"enum":["txt","srt","vtt","json"],"type":"string","description":"Default txt"}}},"responseSchema":{"type":"json","example":{"title":"Me at the zoo","format":"txt","source":"platform","language":"en","transcript":"All right, so here we are in front of the elephants…","duration_sec":19}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_E9xK5_KNHerspoOHvuUKD","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches the existing captions/transcript from a YouTube video (or yt-dlp-supported URL) instantly and returns it in txt, srt, vtt, or json format.","exampleAgentPrompt":"Grab the transcript from this YouTube video — https://www.youtube.com/watch?v=jNQXAC9IVRw — and give it to me as plain text.","exampleUseCases":[{"title":"Summarize a YouTube lecture","prompt":"Get the full transcript from this lecture video https://www.youtube.com/watch?v=dQw4w9WgXcQ in plain text so I can summarize the key points for me."},{"title":"Extract subtitles for translation","prompt":"Pull the captions from https://youtu.be/abc123 in SRT format so I can translate them into Spanish."},{"title":"Index video content for search","prompt":"Fetch the transcript of https://www.youtube.com/watch?v=xyz789 in JSON format so I can index the spoken content and timestamps for search."}],"resultDescription":"A JSON object containing the video title, the requested format (txt/srt/vtt/json), language code, source type (platform captions), the full transcript string, and duration in seconds.","failureModes":["Video has no captions available — returns an error indicating no transcript found","Invalid or unsupported URL format — returns a validation error","Private or age-restricted video — access denied error","YouTube rate limiting or platform-side block — upstream error","Unsupported format enum value — returns a schema validation error"],"whenToPreferThis":"Choose this endpoint when you need instant, low-cost caption extraction from YouTube (or other yt-dlp-supported sites) and the video already has platform captions — it is faster and cheaper than full audio transcription. Prefer this over audio transcription endpoints when captions exist on the platform. It supports multiple caption formats (txt, srt, vtt, json) and requires no signup or API key, billed per-request in USDC via x402 on Base.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T12:30:25.087Z","isFirstParty":false,"canonicalSlug":"automaton-media-apis-youtube-transcript-captions-9f1ec8e2"}