/**
 * Morpho GraphQL API client — live vault metrics (APY, TVL, fees)
 *
 * Endpoint: https://api.morpho.org/graphql
 * Uses V1 vaultByAddress query with GraphQL aliases for batch fetching.
 */
export interface VaultMetrics {
    /** Gross APY as decimal (0.0357 = 3.57%) */
    apy: number;
    /** Net APY after fees (what users actually earn) */
    netApy: number;
    /** Total value locked in USD */
    totalAssetsUsd: number;
    /** Vault fee as decimal (0.25 = 25%) */
    fee: number;
}
/**
 * Batch-fetch metrics for all registered vaults in one GraphQL request.
 * Returns a map keyed by vault slug (e.g. "steakhouse", "moonwell").
 * Returns null if the API is unreachable.
 */
export declare function fetchAllVaultMetrics(chainId?: number): Promise<Record<string, VaultMetrics> | null>;
/**
 * Fetch metrics for a single vault by address.
 * Returns null if the API is unreachable or vault not found.
 */
export declare function fetchVaultMetrics(address: string, chainId?: number): Promise<VaultMetrics | null>;
/**
 * Format TVL as human-readable string (e.g. "$285.5M", "$14.9M", "$190K")
 */
export declare function formatTVL(usd: number): string;
/**
 * Format APY as percentage string (e.g. "3.57%")
 */
export declare function formatAPY(apy: number): string;