Ethereum MCP Server

use serde::{Deserialize, Serialize}; use rust_decimal::Decimal; // MCP Protocol Types #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct JSONRPCRequest { pub jsonrpc: String, pub id: Option<serde_json::Value>, pub method: String, pub params: Option<serde_json::Value>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct JSONRPCResponse { pub jsonrpc: String, pub id: Option<serde_json::Value>, #[serde(skip_serializing_if = "Option::is_none")] pub result: Option<serde_json::Value>, #[serde(skip_serializing_if = "Option::is_none")] pub error: Option<JSONRPCError>, } #[derive(Debug, Clone, Serialize, Deserialize)] pub struct JSONRPCError { pub code: i32, pub message: String, #[serde(skip_serializing_if = "Option::is_none")] pub data: Option<serde_json::Value>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct ServerInfo { pub name: String, pub version: String, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct InitializeParams { #[serde(skip_serializing_if = "Option::is_none")] pub protocol_version: Option<String>, #[serde(skip_serializing_if = "Option::is_none")] pub capabilities: Option<ClientCapabilities>, #[serde(skip_serializing_if = "Option::is_none")] pub client_info: Option<ClientInfo>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct ClientCapabilities { #[serde(skip_serializing_if = "Option::is_none")] pub roots: Option<serde_json::Value>, #[serde(skip_serializing_if = "Option::is_none")] pub sampling: Option<serde_json::Value>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct ClientInfo { pub name: String, pub version: String, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct InitializeResult { pub protocol_version: String, pub capabilities: ServerCapabilities, pub server_info: ServerInfo, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct ServerCapabilities { #[serde(skip_serializing_if = "Option::is_none")] pub resources: Option<ResourceCapabilities>, #[serde(skip_serializing_if = "Option::is_none")] pub tools: Option<ToolCapabilities>, #[serde(skip_serializing_if = "Option::is_none")] pub prompts: Option<PromptCapabilities>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct ResourceCapabilities { #[serde(skip_serializing_if = "Option::is_none")] pub subscribe: Option<bool>, #[serde(skip_serializing_if = "Option::is_none")] pub list_changed: Option<bool>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct ToolCapabilities { #[serde(skip_serializing_if = "Option::is_none")] pub list_changed: Option<bool>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct PromptCapabilities { #[serde(skip_serializing_if = "Option::is_none")] pub list_changed: Option<bool>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct Tool { pub name: String, pub description: String, #[serde(skip_serializing_if = "Option::is_none")] pub input_schema: Option<serde_json::Value>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct CallToolParams { pub name: String, #[serde(skip_serializing_if = "Option::is_none")] pub arguments: Option<serde_json::Value>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct CallToolResult { #[serde(skip_serializing_if = "Option::is_none")] pub content: Option<Vec<ToolContent>>, #[serde(skip_serializing_if = "Option::is_none")] pub is_error: Option<bool>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct ToolContent { #[serde(rename = "type")] pub type_: String, #[serde(skip_serializing_if = "Option::is_none")] pub text: Option<String>, } // Ethereum-specific types #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct BalanceQuery { pub address: String, #[serde(skip_serializing_if = "Option::is_none")] pub token_address: Option<String>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct SwapParams { pub from_token: String, pub to_token: String, pub amount_in: String, #[serde(skip_serializing_if = "Option::is_none")] pub slippage_tolerance: Option<Decimal>, #[serde(skip_serializing_if = "Option::is_none")] pub recipient: Option<String>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct SwapQuote { pub from_token: String, pub to_token: String, pub amount_in: String, pub estimated_amount_out: String, pub price_impact: String, pub gas_estimate: String, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct PoolPriceInfo { // Human-readable price: token1 per token0, already adjusted for decimals pub price_token1_per_token0: Decimal, pub token0: String, pub token1: String, pub token0_decimals: u8, pub token1_decimals: u8, }