get https://example.com/api/v1/balance/agent///
Get the balance for a specific asset on a specific network for an agent.
Returns 0 if the asset account doesn't exist.
Args: session: Database session agent_id: The ID of the agent network: The network (e.g., solana, xrpl) asset: The asset type (e.g., USDC, XRP, SOL) api_key: API key for authentication secret: API secret for authentication request: FastAPI request object for rate limiting
Returns: AssetBalanceResponse: The balance information for the specific asset