A 402 relates to data allocation or available credits. A 429 is a separate rate/abuse window.
402: allocation or quota
Open Usage and inspect the exact error code. A quota-unconfigured account has no data allocation. Quota-exhausted means settled usage plus current reservations has reached capacity.
Reservations can temporarily reduce capacity while requests settle. The current cycle reset is shown in UTC. Key rotation and namespace changes do not refill the account. Overage is disabled.
429: rate window
Read Retry-After, reduce parallel requests and decide when a further attempt is appropriate. Do not create new accounts, keys or connections to evade a rate limit. MCP and the underlying API can each enforce their own windows.
What stays free
Account/usage/entitlement/coverage reads, errors and 304 responses remain free even at zero data quota, subject to authentication and their own controls. They do not create new permissions or credits.
Contact support with the operation, request ID, time and redacted quota/rate details if your approved allocation appears wrong. Avoid sending credentials or retrying automatically. See Errors and credits.