/**
 * Provider registry.
 *
 * Single source of truth for which Fetcher implementation a given standard
 * query should route to. One named slot per data kind — plus a keyed map
 * for `price` so we can route per asset class (crypto → CoinGecko free tier,
 * fx/commodity/stock → BlockRun Gateway / Pyth) without the call sites
 * knowing which provider is active.
 *
 * Design note: this is intentionally not a dependency-injection framework.
 * Tests that need to stub a provider should call `setProvider*()` before
 * acting and reset with `resetProviders()` in a teardown. No magic.
 */
import type { Fetcher } from './fetcher.js';
import type { AssetClass, MarketCoinData, MarketOverviewQueryParams, OHLCVData, OHLCVQueryParams, PriceData, PriceQueryParams, TrendingCoinData, TrendingQueryParams } from './standard-models.js';
export type PriceFetcher = Fetcher<PriceQueryParams, PriceData>;
export interface TradingProviders {
    /** Per-asset-class price fetcher. `getPriceProvider(assetClass)` reads this. */
    price: Record<AssetClass, PriceFetcher>;
    ohlcv: Fetcher<OHLCVQueryParams, OHLCVData>;
    trending: Fetcher<TrendingQueryParams, TrendingCoinData[]>;
    markets: Fetcher<MarketOverviewQueryParams, MarketCoinData[]>;
}
/** Read the active fetcher for a singleton data kind (not price). */
export declare function getProvider<K extends Exclude<keyof TradingProviders, 'price'>>(kind: K): TradingProviders[K];
/** Read the active price fetcher for a given asset class. Defaults to crypto. */
export declare function getPriceProvider(assetClass?: AssetClass): PriceFetcher;
/** Replace one singleton fetcher. */
export declare function setProvider<K extends Exclude<keyof TradingProviders, 'price'>>(kind: K, fetcher: TradingProviders[K]): void;
/** Replace one asset-class price fetcher. */
export declare function setPriceProvider(assetClass: AssetClass, fetcher: PriceFetcher): void;
/** Restore the default wiring — primarily for test isolation. */
export declare function resetProviders(): void;
/**
 * Describe the active wiring for introspection (Panel Markets page, debug).
 * Returns a per-asset-class listing plus the singleton kinds.
 */
export interface ProviderWiringRow {
    kind: string;
    assetClass?: AssetClass;
    provider: string;
    endpoint: string;
    paid: boolean;
}
export declare function describeWiring(): ProviderWiringRow[];