/**
 * Chain types + `fetchChains()` — the SDK-side surface for the
 * `GET /api/x402/facilitator/chains` endpoint on `api.compose.market`.
 *
 * The API is the single source of truth for all chain definitions.
 * The SDK only exports types + a thin fetch function so that consumers
 * (web app, external integrators) can query the live chain table at
 * runtime without shipping a duplicate that can drift out of sync.
 */
export type EvmNetworkId = `eip155:${number}`;
export type SolanaNetworkId = `solana:${string}`;
export type NetworkId = EvmNetworkId | SolanaNetworkId;
export interface FacilitatorChain {
    /** Human-readable name. */
    name: string;
    /** The CAIP-2 network identifier. */
    network: NetworkId;
    /** The namespace of the network, either "eip155" or "solana". */
    namespace: "eip155" | "solana";
    /** The short name of the network. */
    shortName?: string;
    /** Indicates whether the network is a testnet. */
    isTestnet: boolean;
    /** The URL of the block explorer. */
    explorer: string;
    /** Optional query string required to select the correct explorer cluster. */
    explorerQuery?: string;
    /** The RPC endpoint URL for this chain. */
    rpcUrl: string;
    assetAddress: string;
    schemes: readonly ("exact" | "upto" | "batch-settlement")[];
    asset: "USDC" | "USDT";
    decimals: 6;
}
export interface FacilitatorChainsResponse {
    chains: FacilitatorChain[];
    defaultNetwork: NetworkId;
}
export interface FetchChainsOptions {
    /** API base URL. Defaults to `https://api.compose.market`. */
    baseUrl?: string;
    /** Custom fetch implementation. */
    fetch?: typeof fetch;
    /** Abort signal. */
    signal?: AbortSignal;
}
export declare function fetchChains(options?: FetchChainsOptions): Promise<FacilitatorChainsResponse>;
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