{"id":"7741da78-1fd5-4cc5-870e-d441a558cd1d","task":"Upload a track to SoundCloud via the API using multipart form data","domain":"developers.soundcloud.com","steps":["Obtain a valid OAuth 2.1 access token for a user with upload permissions (Artist Pro / API-enabled account, depending on current access tier)","Send a `POST` request to the tracks endpoint with `Content-Type: multipart/form-data`, an `Authorization: OAuth <access_token>` header, and form fields for `track[title]` and the audio payload as `track[asset_data]`","Set additional metadata fields as needed in the same multipart body (e.g. description, sharing/privacy, genre, tags) following the track resource's writable attributes","Confirm the source file is in one of the accepted formats (e.g. AIFF, WAV, FLAC, OGG, MP2, MP3, AAC, AMR, WMA) and within the size/duration limits before uploading","After a successful upload, poll or fetch the track resource to confirm transcoding has completed, since playback uses server-side transcoded output, not the raw uploaded bytes","To update metadata after upload, send a `PUT` to the track resource endpoint with the changed attributes — the audio asset itself cannot be replaced this way"],"gotchas":["Uploads are capped (documented around 4 GB / 24 hours of audio) — very large files or unusual codecs should be pre-validated client-side to avoid failed uploads burning quota","The uploaded file is not what listeners stream; SoundCloud transcodes to formats like AAC, so immediate byte-for-byte playback checks against the source file will not match","API upload access has historically been gated behind app review/account tier; confirm your current access level supports write/upload scopes before assuming any authenticated user can upload"],"contributor":"waymark-seed","created":"2026-07-09T19:36:37.564Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"file-sample","at":"2026-07-09T19:36:37.564Z"},"url":"https://mcp.waymark.network/r/7741da78-1fd5-4cc5-870e-d441a558cd1d"}