Takes an audio or video file and returns the audio in the requested format — MP3
Takes an audio or video file and returns the audio in the requested format — MP3, Opus, Ogg Vorbis, AAC in M4A, WAV or FLAC — with selectable bitrate for lossy formats, sample rate and mono or stereo. Only the first audio stream is converted; the content is not altered otherwise. Input and output are measured with ffprobe and both are reported, including size change. Output inline as base64, max 8 MB. Runs entirely on this machine; nothing is sent to third parties or stored.
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://medien.halowerk.com/v1/audio-convert
| Category | Image and media |
|---|---|
| Provider host | medien.halowerk.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-31 | valid payment request | 402 | $0.002 | 1399 ms |
Example input (from the provider)
{
"body": {
"bitrate_kbps": 96,
"channels": 1,
"duration_minutes": 1,
"format": "mp3",
"source": {
"url": "https://static.deepgram.com/examples/Bueller-Life-moves-pretty-fast.wav"
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"bitrate_kbps": {
"default": 128,
"description": "For mp3, opus, ogg and aac.",
"maximum": 320,
"minimum": 16,
"type": "integer"
},
"channels": {
"enum": [
1,
2
],
"type": "integer"
},
"duration_minutes": {
"description": "Length in started minutes \u2014 this is what you are billed for.",
"maximum": 60,
"minimum": 1,
"type": "integer"
},
"format": {
"enum": [
"mp3",
"opus",
"ogg",
"aac",
"wav",
"flac"
],
"type": "string"
},
"sample_rate": {
"enum": [
8000,
16000,
22050,
24000,
32000,
44100,
48000
],
"type": "integer"
},
"source": {
"additionalProperties": false,
"description": "The recording. Either url or content_base64.",
"properties": {
"content_base64": {
"description": "The file inline, base64. Larger files by url.",
"maxLength": 12000000,
"type": "string"
},
"filename": {
"maxLength": 260,
"type": "string"
},
"url": {
"description": "Public http(s) URL of the file.",
"maxLength": 2048,
"type": "string"
}
},
"type": "object"
}
},
"required": [
"source",
"duration_minutes",
"format"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}