export declare class AccessError extends Error {
    readonly suggestedStatus: number;
    constructor(message: string, suggestedStatus: number);
}
export declare class MissingAuthError extends AccessError {
    constructor();
}
export declare class InvalidSignatureError extends AccessError {
    constructor(detail?: string);
}
export declare class ExpiredSignatureError extends AccessError {
    constructor();
}
export declare class FutureSignatureError extends AccessError {
    constructor();
}
export declare class ReplayedNonceError extends AccessError {
    constructor();
}
export declare class InvalidPassError extends AccessError {
    constructor();
}
export declare class AttestUnreachableError extends AccessError {
    constructor();
}
/**
 * Thrown when InsumerAPI /v1/attest refuses the request itself (a 4xx other than 402, 408
 * or 429): a bad key, a retired chain, a malformed contract address. Retrying cannot change
 * the answer, so it is not retried and not reported as an outage. The upstream message is
 * logged server-side; the client sees an opaque 500.
 */
export declare class AttestRejectedError extends AccessError {
    readonly upstreamStatus: number;
    constructor(upstreamStatus: number);
}
/**
 * Thrown when InsumerAPI /v1/attest returns 402 (Insufficient credits).
 * Adopter's InsumerAPI key needs a top-up. Distinct from AttestUnreachableError
 * so adopters can alert on credit drawdown separately from genuine outages.
 * Client-facing status (503) and opaque message match AttestUnreachableError
 * — the distinction lives at the error-class level for adopter-side handling.
 */
export declare class InsumerCreditsExhaustedError extends AccessError {
    constructor();
}
export declare class DisabledModeError extends AccessError {
    constructor();
}
export declare class MisconfiguredTierError extends Error {
    constructor(tierKey: string, validKeys: string[]);
}
export declare class ProductionMockError extends Error {
    constructor(nodeEnv: string | undefined);
}
export declare class NonceTtlTooShortError extends Error {
    constructor(actualMs: number);
}
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