/**
 * Transaction signing policy engine.
 * Evaluates requests against chain/contract/value/rate/method/replay rules.
 */
export interface SigningPolicy {
    allowedChainIds: number[];
    allowedContracts: string[];
    deniedContracts: string[];
    maxTransactionValueWei: string;
    maxTransactionsPerHour: number;
    maxTransactionsPerDay: number;
    allowedMethodSelectors: string[];
    humanConfirmationThresholdWei: string;
    requireHumanConfirmation: boolean;
}
export interface SigningRequest {
    requestId: string;
    chainId: number;
    to: string;
    value: string;
    data: string;
    nonce?: number;
    gasLimit?: string;
    createdAt: number;
}
export type PolicyDecision = {
    allowed: boolean;
    reason: string;
    requiresHumanConfirmation: boolean;
    matchedRule: string;
};
export declare function createDefaultPolicy(): SigningPolicy;
export declare class SigningPolicyEvaluator {
    private policy;
    private requestLog;
    private processedRequestIds;
    constructor(policy?: SigningPolicy);
    updatePolicy(policy: SigningPolicy): void;
    getPolicy(): SigningPolicy;
    evaluate(request: SigningRequest): PolicyDecision;
    /** Record after signing completes (for replay + rate tracking). */
    recordRequest(requestId: string): void;
}
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