Error reference

Branch on `code`, never on `message`.

Error shape

{
  "error": {
    "code": "size_required",
    "message": "size_usd is required — an estimate without a size is meaningless.",
    "docs": "https://docs.crifine.app/api/exit"
  }
}

Status	Code	What to do
400	`size_required`	Pass `size_usd`. There is no default, deliberately.
400	`size_out_of_range`	Sizes below $1,000 or above $500M are rejected rather than guessed at.
402	`payment_required`	Settle the quoted amount and retry with `X-Payment-Proof`.
404	`pool_not_found`	Check `GET /v1/pools`. The pool may not be under recording yet.
409	`insufficient_history`	The pool has fewer observed days than the requested window. Shorten the window or accept a lower `days_observed`.
429	`rate_limited`	Back off using `Retry-After`. Applies to free verification endpoints only.
503	`recorder_gap`	A depth snapshot window was missed and the result would be unsound. Retry; do not fall back to oracle price.