BDND exposes an S3-compatible API plus a small REST layer for account operations.
Object storage: https://s3.bdnd.org
Account API: https://api.bdnd.org/v1
S3 requests use SigV4 with your access/secret key pair. REST requests use a bearer token from the dashboard.
curl https://api.bdnd.org/v1/buckets \\ -H "Authorization: Bearer $TOKEN"
Any AWS SDK works against the S3 endpoint. For backups we recommend restic or rclone.
Full reference is available after you sign in.