import type { GetPaymasterDataParameters, GetPaymasterDataReturnType, GetPaymasterStubDataParameters, GetPaymasterStubDataReturnType } from 'viem/account-abstraction';
/** Client-side sponsorship policy configuration.
 *  Defense-in-depth layer on top of the paymaster's own server-side policies.
 *  All checks are enforced before calling the paymaster RPC. */
export interface PaymasterPolicy {
    /** Only sponsor UserOps from these smart account addresses.
     *  When empty/undefined, sponsors all accounts. */
    allowedAccounts?: `0x${string}`[];
    /** Maximum number of sponsored UserOps per account per day (anti-Sybil).
     *  0 or undefined = no limit. */
    maxSponsoredPerDay?: number;
    /** Maximum gas cost (in wei) to sponsor per UserOp.
     *  UserOps exceeding this cost fall back to self-paid. */
    maxGasCostWei?: bigint;
}
/** Paymaster middleware shape expected by createSmartAccountClient */
export interface PaymasterMiddleware {
    getPaymasterData: (parameters: GetPaymasterDataParameters) => Promise<GetPaymasterDataReturnType>;
    getPaymasterStubData: (parameters: GetPaymasterStubDataParameters) => Promise<GetPaymasterStubDataReturnType>;
}
/** Check if the policy allows sponsoring this UserOp.
 *  Returns a reason string if denied, undefined if allowed. */
export declare function checkPolicy(policy: PaymasterPolicy | undefined, params: GetPaymasterDataParameters): string | undefined;
/** Create a paymaster middleware that wraps a PimlicoClient with graceful fallback
 *  and optional policy enforcement.
 *
 *  When the paymaster is unreachable or rejects the UserOp, the middleware returns
 *  empty paymaster data so the UserOp falls back to self-paid gas.
 *
 *  @param paymasterUrl - URL for the paymaster RPC endpoint
 *  @param policy - Optional sponsorship policy for client-side filtering
 *  @returns PaymasterMiddleware compatible with permissionless's createSmartAccountClient
 */
export declare function createPaymasterMiddleware(paymasterUrl: string, policy?: PaymasterPolicy): PaymasterMiddleware;
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