/**
 * Cost policy engine for x402-cfo agent.
 *
 * Declarative rules that determine whether a payment should be made.
 * Policies are checked BEFORE budget enforcement — a policy denial
 * means the agent won't even attempt the payment.
 */
export interface PolicyRules {
    /** Max amount in dollars for any single request. */
    maxPerRequest?: number;
    /** URLs that are allowed (if set, only these are permitted). */
    allowlist?: string[];
    /** URLs that are explicitly blocked. */
    blocklist?: string[];
    /** Allowed currencies (e.g. ['USDC']). */
    allowedCurrencies?: string[];
    /** Allowed networks (e.g. ['base', 'ethereum']). */
    allowedNetworks?: string[];
}
export type PolicyDenialReason = 'exceeds_max_per_request' | 'url_not_in_allowlist' | 'url_in_blocklist' | 'currency_not_allowed' | 'network_not_allowed';
export interface PolicyDecision {
    allowed: boolean;
    reason?: PolicyDenialReason;
    message?: string;
}
export declare class Policy {
    private rules;
    constructor(rules?: PolicyRules);
    /**
     * Check if a proposed payment passes policy rules.
     */
    check(params: {
        url: string;
        amount: number;
        currency: string;
        network: string;
    }): PolicyDecision;
    /** Simple URL matching: exact match or domain prefix match. */
    private matchUrl;
}
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