My credit balance appears stuck even with usage

My credit balance has not updated for the past couple of days, even though I have been accessing GPT models via the API. I’m referring to the Credit Balance found on https://platform.openai.com → Billing.

I’m generally mindful of how much I have left, as I do not want to overspend. I constantly refer back to the Billing page every couple of prompts (mostly sent via the VSCode Codex Extension and occasionally through the PI CLI tool).

I’m getting a little suspicious of the static Credit Balance value over the past few days, as I might suddenly be charged with unexpected costs that could have been avoided.