invalid_api_key

Status: 401 · Code: invalid_api_key

The key you sent doesn't match any active key on any workspace.

Common causes

• The key was revoked from the dashboard
• You're using a production key (sk_live_...) against a staging setup, or vice-versa
• You copy-pasted the key prefix shown in the dashboard — only the full secret works, and we only show that once at creation
• Leading/trailing whitespace snuck in (common when pasting from a terminal)

How to fix

1. Open app.send0.dev/api-keys. Check the key you're using is in the list and active.
2. If it's not there or is revoked: create a new one and store it securely (environment variable, not committed to git).
3. Trim the value: echo -n "$SEND0_API_KEY" | wc -c should match the expected key length.

Related

• Authentication
• missing_api_key
• invalid_auth_format