/**
 * ClientEvmSigner - Used by x402 clients to sign payment authorizations.
 *
 * Typically a viem WalletClient extended with publicActions:
 * ```typescript
 * const client = createWalletClient({
 *   account: privateKeyToAccount('0x...'),
 *   chain: baseSepolia,
 *   transport: http(),
 * }).extend(publicActions);
 * ```
 *
 * Or composed via `toClientEvmSigner(account, publicClient)`.
 */
type ClientEvmSigner = {
    readonly address: `0x${string}`;
    signTypedData(message: {
        domain: Record<string, unknown>;
        types: Record<string, unknown>;
        primaryType: string;
        message: Record<string, unknown>;
    }): Promise<`0x${string}`>;
    /**
     * Optional on-chain reads.
     * Required only for extension enrichment (EIP-2612 / ERC-20 approval).
     */
    readContract?(args: {
        address: `0x${string}`;
        abi: readonly unknown[];
        functionName: string;
        args?: readonly unknown[];
    }): Promise<unknown>;
    /**
     * Optional: Signs a raw EIP-1559 transaction without broadcasting.
     * Required for ERC-20 approval gas sponsoring when the token lacks EIP-2612.
     */
    signTransaction?(args: {
        to: `0x${string}`;
        data: `0x${string}`;
        nonce: number;
        gas: bigint;
        maxFeePerGas: bigint;
        maxPriorityFeePerGas: bigint;
        chainId: number;
    }): Promise<`0x${string}`>;
    /**
     * Optional: Gets the current transaction count (nonce) for an address.
     * Required for ERC-20 approval gas sponsoring.
     */
    getTransactionCount?(args: {
        address: `0x${string}`;
    }): Promise<number>;
    /**
     * Optional: Estimates current gas fees per gas.
     * Required for ERC-20 approval gas sponsoring.
     */
    estimateFeesPerGas?(): Promise<{
        maxFeePerGas: bigint;
        maxPriorityFeePerGas: bigint;
    }>;
};
/**
 * FacilitatorEvmSigner - Used by x402 facilitators to verify and settle payments
 * This is typically a viem PublicClient + WalletClient combination that can
 * read contract state, verify signatures, write transactions, and wait for receipts
 *
 * Supports multiple addresses for load balancing, key rotation, and high availability
 */
type FacilitatorEvmSigner = {
    /**
     * Get all addresses this facilitator can use for signing
     * Enables dynamic address selection for load balancing and key rotation
     */
    getAddresses(): readonly `0x${string}`[];
    readContract(args: {
        address: `0x${string}`;
        abi: readonly unknown[];
        functionName: string;
        args?: readonly unknown[];
    }): Promise<unknown>;
    verifyTypedData(args: {
        address: `0x${string}`;
        domain: Record<string, unknown>;
        types: Record<string, unknown>;
        primaryType: string;
        message: Record<string, unknown>;
        signature: `0x${string}`;
    }): Promise<boolean>;
    writeContract(args: {
        address: `0x${string}`;
        abi: readonly unknown[];
        functionName: string;
        args: readonly unknown[];
        /** Optional gas limit. When provided, skips eth_estimateGas simulation. */
        gas?: bigint;
    }): Promise<`0x${string}`>;
    sendTransaction(args: {
        to: `0x${string}`;
        data: `0x${string}`;
    }): Promise<`0x${string}`>;
    waitForTransactionReceipt(args: {
        hash: `0x${string}`;
    }): Promise<{
        status: string;
    }>;
    getCode(args: {
        address: `0x${string}`;
    }): Promise<`0x${string}` | undefined>;
};
/**
 * Composes a ClientEvmSigner from a local account and a public client.
 *
 * Use this when your signer (e.g., `privateKeyToAccount`) doesn't have
 * `readContract`. The `publicClient` provides the on-chain read capability.
 *
 * Alternatively, use a WalletClient extended with publicActions directly:
 * ```typescript
 * const signer = createWalletClient({
 *   account: privateKeyToAccount('0x...'),
 *   chain: baseSepolia,
 *   transport: http(),
 * }).extend(publicActions);
 * ```
 *
 * @param signer - A signer with `address` and `signTypedData` (and optionally `readContract`)
 * @param publicClient - A client with optional read/nonce/fee helpers
 * @param publicClient.readContract - The readContract method from the public client
 * @param publicClient.getTransactionCount - Optional getTransactionCount for ERC-20 approval
 * @param publicClient.estimateFeesPerGas - Optional estimateFeesPerGas for ERC-20 approval
 * @returns A ClientEvmSigner with any available optional capabilities
 *
 * @example
 * ```typescript
 * const account = privateKeyToAccount("0x...");
 * const publicClient = createPublicClient({ chain: baseSepolia, transport: http() });
 * const signer = toClientEvmSigner(account, publicClient);
 * ```
 */
declare function toClientEvmSigner(signer: Omit<ClientEvmSigner, "readContract"> & {
    readContract?: ClientEvmSigner["readContract"];
}, publicClient?: {
    readContract(args: {
        address: `0x${string}`;
        abi: readonly unknown[];
        functionName: string;
        args?: readonly unknown[];
    }): Promise<unknown>;
    getTransactionCount?(args: {
        address: `0x${string}`;
    }): Promise<number>;
    estimateFeesPerGas?(): Promise<{
        maxFeePerGas: bigint;
        maxPriorityFeePerGas: bigint;
    }>;
}): ClientEvmSigner;
/**
 * Converts a viem client with single address to a FacilitatorEvmSigner
 * Wraps the single address in a getAddresses() function for compatibility
 *
 * @param client - The client to convert (must have 'address' property)
 * @returns FacilitatorEvmSigner with getAddresses() support
 */
declare function toFacilitatorEvmSigner(client: Omit<FacilitatorEvmSigner, "getAddresses"> & {
    address: `0x${string}`;
}): FacilitatorEvmSigner;

export { type ClientEvmSigner as C, type FacilitatorEvmSigner as F, toFacilitatorEvmSigner as a, toClientEvmSigner as t };