/**
 * @name FacilitatorRpcFallback
 * @description Resilient RPC endpoint failover with round-robin and timeouts
 *   for x402 SVM facilitator operations.
 *
 * Strategy:
 *   1. Round-robin — each call starts from the next endpoint in the rotation
 *   2. Timeout — each attempt gets a configurable deadline (default 8s)
 *   3. Failover — on transient errors or timeout, immediately tries the next endpoint
 *   4. Multiple public mainnet RPCs are included as defaults to avoid rate limits
 */
import type { FacilitatorSvmSigner } from '@x402/svm';
/**
 * @name FacilitatorRpcEndpoint
 * @description One RPC-backed facilitator signer candidate used during failover.
 */
export interface FacilitatorRpcEndpoint {
    label: string;
    rpcUrl?: string;
    signer: FacilitatorSvmSigner;
}
/**
 * @name createResilientFacilitatorSigner
 * @description Wraps one or more facilitator signers with round-robin load balancing,
 *   per-attempt timeouts, and failover for transient RPC failures.
 */
export declare function createResilientFacilitatorSigner(endpoints: readonly FacilitatorRpcEndpoint[]): FacilitatorSvmSigner;
/**
 * @name parseRpcFallbackUrls
 * @description Parses comma-separated RPC fallback URLs from environment variables or config files.
 */
export declare function parseRpcFallbackUrls(value: string | undefined): string[];
/**
 * @name uniqueRpcUrls
 * @description Deduplicates RPC URLs while preserving priority order.
 */
export declare function uniqueRpcUrls(urls: readonly string[]): string[];
/**
 * @name isTransientRpcError
 * @description Returns true when an error is likely caused by endpoint health, lag, throttling, or transport.
 */
export declare function isTransientRpcError(error: unknown): boolean;
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