Connect ZeroBounce
You need API key. About two minutes.
1Get your API key
API key
Paste the ZeroBounce key- Sign in to ZeroBounce and open the API Keys page.
- Copy the Master Key, or click Create a new API Key and set it active.
Checking the balance is free and verifies nothing.
Open the pagehttps://www.zerobounce.net/members/apikey
2Add it to CreditBar
- Open CreditBar from the menu bar and choose Settings, then Accounts.
- Click Add account and pick ZeroBounce.
- Paste the API key into the matching field, and give the account a label you will recognise.
- Click Test connection, then Add. Numbers appear in the menu bar within a minute.
Keys are stored in your Mac's Keychain and only ever sent to ZeroBounce. Nothing passes through a CreditBar server.
3What it reads
- Reports
- remaining verification credits
- Calls
- https://api.zerobounce.net/v2/getcredits
- Refreshes
- At most every 5 minutes
- API docs
- ZeroBounce reference, checked 2026-09-16
A rejected key is reported as a balance of -1 rather than as an error.