Hi there – async API calls can take a bit longer for the providers to respond back to Clay when a request is made.
The "awaiting callback" value is for reflecting that status – when a request has been sent but the provider hasn’t responded back yet. (This could happen due to delays or extended processing time on the provider's side, for example.)
Cells shouldn't remain in that status for too long, in typical conditions. It would update when the callback is received, and the cell should eventually reflect how the transaction ultimately concluded (success, error, retry, etc.).