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agent402.tools Audio Convert (MP4 to MP3)
x402
agent402.tools Audio Convert (MP4 to MP3) is a paid API for AI agents from agent402.tools, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Extracts and converts the audio track from any media URL (mp4, mov, wav, m4a, ogg, etc.) to MP3 using ffmpeg, returning the result as base64
Price / call$0.02
Success—
StatusUnknown
How this service works
Extract/convert the audio track of any media URL (mp4, mov, wav, m4a, ogg…) to MP3 - the "mp4 to mp3" conversion, deterministic ffmpeg, no AI. Body: {"url":"https://…/video.mp4","bitrate":"192k"?}. Returns the MP3 as base64.
Output
Returns the converted MP3 audio file encoded as a base64 string, ready to be decoded and saved as an .mp3 file. The output reflects the requested bitrate (128k, 192k default, or 320k).
Example use cases
Example prompt
“Can you extract the audio from this video and give it to me as an MP3 at 320k bitrate? The file is at https://example.com/lecture.mp4”
Technical details
Endpoint
POSThttps://agent402.tools/api/audio-convertWhen to prefer
Use this endpoint when you need a deterministic, non-AI audio extraction or format conversion from a remote media URL to MP3. Ideal when you want a reliable ffmpeg-based transcode without uploading files directly — just pass a public URL and optionally specify bitrate. Prefer this over AI-based audio tools when no speech recognition or analysis is needed, just format conversion.
Side effects
- URL is not publicly accessible or returns 4xx/5xx — conversion fails
- Media file exceeds 30MB size limit — request rejected
- URL points to an unsupported or non-media format — ffmpeg cannot process
- Invalid bitrate string provided — may default or error
- Network timeout fetching the remote media URL — conversion fails
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public URL of the media file (max 30MB) |
| bitrate | string | MP3 bitrate, e.g. "128k", "192k" (default), "320k" |
Output
Schema · Response
{
"type": "json",
"example": {
"bytes": 2210000,
"format": "mp3",
"bitrate": "192k",
"mp3Base64": "SUQzBAAAAA…"
}
}Tags
x402
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