YouTube Transcript & Captions

Full transcript of any YouTube video by video id or URL: captions/subtitles as clean plain text plus timestamped segments, the video's chapter markers, and every caption track it offers so an agent can pick a language and re-fetch. YouTube transcript, video to text, captions extraction, subtitle download, closed captions, speech to text, multilingual, asr and authored tracks. No API key.

Resource: youtube.use.x402atlas.com/transcript

Network: eip155:8453, eip155:137, eip155:42161, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 · Pay to: 0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2

Payment methods: — · Last validation: 2026-10-15 11:52:09.127+00

{
  "input": {
    "type": "object",
    "required": [
      "type",
      "method"
    ],
    "properties": {
      "type": {
        "type": "string",
        "const": "http"
      },
      "method": {
        "enum": [
          "GET"
        ],
        "type": "string"
      },
      "queryParams": {
        "type": "object",
        "required": [
          "v"
        ],
        "properties": {
          "v": {
            "type": "string",
            "maxLength": 500,
            "description": "YouTube video id (11 characters) or a full YouTube video URL"
          }
        }
      }
    },
    "additionalProperties": false
  },
  "output": {
    "type": "object",
    "required": [
      "type"
    ],
    "properties": {
      "type": {
        "type": "string"
      },
      "example": {
        "type": "object",
        "required": [
          "video_id",
          "queried_at",
          "text",
          "segments",
          "chapters",
          "available_transcripts"
        ],
        "properties": {
          "note": {
            "type": "string",
            "description": "Present only on the sample response (a call with no v): a hint that this is a canned example. The paid request ran; no upstream call was made."
          },
          "text": {
            "type": "string",
            "description": "Whole transcript as one plain-text block"
          },
          "chapters": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "title": {
                  "type": "string"
                },
                "end_ms": {
                  "type": "integer"
                },
                "start_ms": {
                  "type": "integer"
                },
                "start_time_text": {
                  "type": "string"
                }
              }
            },
            "description": "Chapter markers; empty for videos without chapters"
          },
          "segments": {
            "type": "array",
            "items": {
              "type": "object",
              "required": [
                "start_ms",
                "text"
              ],
              "properties": {
                "text": {
                  "type": "string"
                },
                "end_ms": {
                  "type": "integer",
                  "description": "Line end offset in milliseconds; absent on tracks that carry only starts"
                },
                "start_ms": {
                  "type": "integer",
                  "description": "Line start offset in milliseconds"
                },
                "start_time_text": {
                  "type": "string",
                  "description": "Line start as displayed, e.g. 0:43"
                }
              }
            }
          },
          "video_id": {
            "type": "string",
            "description": "Normalized 11-character video id"
          },
          "queried_at": {
            "type": "string",
            "format": "date-time"
          },
          "language_code": {
            "type": "string",
            "description": "Language of the track actually served; omitted when the upstream identifies none — never an echo of the request"
          },
          "available_transcripts": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "type": {
                  "type": "string",
                  "description": "asr on auto-generated tracks; absent on authored ones"
                },
                "title": {
                  "type": "string",
                  "description": "Track title, on videos with named tracks"
                },
                "selected": {
                  "type": "boolean",
                  "description": "True on the track this response served"
                },
                "language_code": {
                  "type": "string"
                }
              }
            },
            "description": "Every track this video offers; feed language_code/type/title back to fetch one. A language may appear twice — the authored track and the asr one."
          }
        }
      }
    }
  },
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}

Source catalog records are retained separately from live endpoint observations. Sonar score, uptime, and latency are advisory metrics. CDP indexing is not inferred from validation.