The quote.

The request is malformed (code = invalid_request): a bad parameter or header, a missing or malformed Idempotency-Key, or a body member the contract does not have — named, by its path in the body, in errors. Do not retry unchanged.

No valid API key (code = unauthorized): missing, malformed, unknown, revoked or expired, or a wrong secret. The message is worded for an API key — this surface has no session to sign in to.

The key is valid but the request is not allowed: api_access_inactive (the workspace may not use the API right now; reason says why and paidThroughUtc until when it was paid, when known), ip_not_allowed (the key is not accepted from the request's source address), or forbidden (the key lacks the required scope).

The withdrawal cannot be quoted (code = withdrawal_unavailable): the workspace holds no active wallet in that currency.

The request body is over 256 KiB (code = payload_too_large).

The request body is not application/json (code = unsupported_media_type).

The amount cannot be withdrawn: withdrawal_amount_below_minimum or withdrawal_amount_below_fee.

A request budget is spent (code = rate_limited): the workspace's 120 requests per minute, the catalog images' 300 per minute, or the per-address limits applied before the key is checked. Retry-After is 60 for a per-minute budget and 1 for the per-address concurrency cap; a per-minute refusal also carries RateLimit-Limit, RateLimit-Remaining (0) and RateLimit-Reset.