/**
 * On-Demand Account Usage Fetch
 *
 * Lightweight account-limit refresh: queries Anthropic's OAuth usage endpoint
 * (the same call Claude Code's /usage makes) to get fresh session / weekly /
 * model-scoped windows without consuming tokens or starting a 5h session.
 *
 * This complements — never replaces — the passive header capture in
 * accountQuota.ts: `usageToQuota` normalizes the endpoint payload into the
 * same `AccountQuota` shape so refreshed data flows through the existing
 * save/merge/cooldown chain. Manual refresh and adaptive proxy prewarming use
 * the same transport through the route-owned single-flight coordinator.
 *
 * Only OAuth (Bearer) accounts have subscription windows; api_key accounts
 * are skipped and keep their header-derived absolute limits.
 */
import type { AccountAllowlist, AccountQuota, AccountUsageFetchResult, AnthropicUsageResponse, ProxyPassthroughAccount } from "../types/index.js";
export declare const ANTHROPIC_USAGE_URL = "https://api.anthropic.com/api/oauth/usage";
/**
 * Enumerate stored Anthropic accounts for a usage refresh.
 * Read-only: no token refresh, no disable side effects — those decisions
 * belong to the caller (fetchAccountUsage / the routing path respectively).
 */
export declare function listAnthropicAccountsForUsage(allowlist?: AccountAllowlist): Promise<ProxyPassthroughAccount[]>;
/**
 * Fetch fresh usage windows for one account. Return-not-throw.
 * Refreshes an expiring/expired token first (de-duped, rotation-safe), and
 * retries once through a forced refresh on a 401.
 */
export declare function fetchAccountUsage(account: ProxyPassthroughAccount): Promise<AccountUsageFetchResult>;
/**
 * Normalize a usage-endpoint payload into the `AccountQuota` shape used by
 * the passive header path, so a refresh writes through the exact same
 * save/merge/cooldown chain.
 *
 * `prior` supplies fields the usage payload cannot express (fallback and
 * upgrade-path signals) so `isQuotaOverageAvailable` behaves identically
 * before and after a refresh. `unifiedStatus` is deliberately never set:
 * fabricating it would let the reconcile path treat a refresh like a
 * unified-rejected 429.
 */
export declare function usageToQuota(usage: AnthropicUsageResponse, opts: {
    now: number;
    prior?: AccountQuota | null;
}): AccountQuota | null;