The error “API HTTP 503” is experienced when you are trying to send Bitcoin from your account but have an outdated Ledger Live application, Bitcoin app, or firmware on your Ledger device.

Please download the last update of Ledger Live Application:

1. Ledger Live for Windows 10/11

2. Ledger Live for MAC

3. Ledger Live for Android

To fix this

• Update your Ledger device to the latest firmware — if there’s an available update.
• Update your Ledger Live app to the latest version — if there’s an available update. If you’re unable to update it automatically inside the Ledger Live app, try to update it manually by downloading the latest version from the Ledger Live website.
• Update your Bitcoin app to the latest version.