feat: add Kucoin to healthcheck example

- Added check_kucoin() function with specific error handling
- Detects common Kucoin API errors (400003-400007)
- Requires KUCOIN_API_PUBKEY, KUCOIN_API_SECRET, and KUCOIN_API_PASSPHRASE
- Updated healthcheck to require kucoin feature

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: valeratrades

examples/healthcheck.rs

@@ -10,6 +10,7 @@ async fn main() {
 
 	check_binance().await;
 	check_bybit().await;
+	check_kucoin().await;
 	check_mexc().await;
 
 	println!("\n=== Health Check Complete ===");
@@ -55,6 +56,52 @@ async fn check_bybit() {
 	}
 }
 
+async fn check_kucoin() {
+	println!("🔍 Checking Kucoin...");
+
+	let key_var = "KUCOIN_API_PUBKEY";
+	let secret_var = "KUCOIN_API_SECRET";
+	let passphrase_var = "KUCOIN_API_PASSPHRASE";
+
+	match (env::var(key_var), env::var(secret_var), env::var(passphrase_var)) {
+		(Ok(key), Ok(secret), Ok(passphrase)) => {
+			#[cfg(feature = "kucoin")]
+			{
+				use v_exchanges_adapters::kucoin::KucoinOption;
+				let mut kucoin = ExchangeName::Kucoin.init_client();
+				kucoin.update_default_option(KucoinOption::Pubkey(key));
+				kucoin.update_default_option(KucoinOption::Secret(secret.into()));
+				kucoin.update_default_option(KucoinOption::Passphrase(passphrase.into()));
+
+				match kucoin.balances(Instrument::Spot, None).await {
+					Ok(_) => println!("✅ Kucoin: API key is valid and active"),
+					Err(e) => {
+						let err_str = e.to_string();
+						if err_str.contains("400003") || err_str.contains("KC-API-KEY not exists") {
+							println!("❌ Kucoin: API key does not exist or has been deleted");
+						} else if err_str.contains("400004") || err_str.contains("KC-API-PASSPHRASE") {
+							println!("❌ Kucoin: Invalid passphrase");
+						} else if err_str.contains("400005") || err_str.contains("Signature") {
+							println!("❌ Kucoin: Invalid signature (check API secret)");
+						} else if err_str.contains("400006") || err_str.contains("timestamp") {
+							println!("❌ Kucoin: Invalid timestamp");
+						} else if err_str.contains("400007") || err_str.contains("KC-API-KEY-VERSION") {
+							println!("❌ Kucoin: Invalid API key version");
+						} else {
+							println!("❌ Kucoin: API key error - {}", e);
+						}
+					}
+				}
+			}
+			#[cfg(not(feature = "kucoin"))]
+			{
+				println!("⚠️  Kucoin: Feature not enabled (compile with --features kucoin)");
+			}
+		}
+		_ => println!("⚠️  Kucoin: Environment variables {}, {}, or {} not set", key_var, secret_var, passphrase_var),
+	}
+}
+
 async fn check_mexc() {
 	println!("🔍 Checking MEXC...");
 

v_exchanges/Cargo.toml

@@ -115,5 +115,5 @@ path = "../examples/mexc.rs"
 
 [[example]]
 name = "healthcheck"
-required-features = ["binance", "bybit", "mexc"]
+required-features = ["binance", "bybit", "kucoin", "mexc"]
 path = "../examples/healthcheck.rs"