feat: fetch alpha price by symbol ticker

Keep alpha token existence from list cache and fetch live alpha price via symbol ticker endpoint for richer token response accuracy.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/data/imarket.go

@@ -13,6 +13,7 @@ type IMarket interface {
 	// Alpha token methods
 	IsAlphaToken(symbol string) bool
 	GetAlphaToken(symbol string) (market.AlphaTokenInfo, bool)
+	GetAlphaPrice(symbol string) (float64, bool)
 
 	// Trading pair methods
 	IsSpotPair(symbol string) bool

internal/data/market/alpha_tokens.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"net/url"
 	"strconv"
 	"time"
 
@@ -54,10 +55,21 @@ type AlphaTokenInfo struct {
 
 // AlphaTokenResponse represents the API response structure
 type AlphaTokenResponse struct {
-	Code         string           `json:"code"`
-	Message      *string          `json:"message"`
+	Code          string           `json:"code"`
+	Message       *string          `json:"message"`
+	MessageDetail *string          `json:"messageDetail"`
+	Data          []AlphaTokenInfo `json:"data"`
+}
+
+type AlphaTickerData struct {
+	Price string `json:"price"`
+}
+
+type AlphaTickerResponse struct {
+	Code          string          `json:"code"`
+	Message       *string         `json:"message"`
 	MessageDetail *string         `json:"messageDetail"`
-	Data         []AlphaTokenInfo `json:"data"`
+	Data          AlphaTickerData `json:"data"`
 }
 
 // GetPrice returns the price as float64
@@ -150,3 +162,37 @@ func (ms *MarketData) IsAlphaToken(symbol string) bool {
 	_, exists := ms.GetAlphaToken(symbol)
 	return exists
 }
+
+func (ms *MarketData) GetAlphaPrice(symbol string) (float64, bool) {
+	const alphaTickerURL = "https://www.binance.com/bapi/defi/v1/public/alpha-trade/ticker"
+
+	client := &http.Client{Timeout: 5 * time.Second}
+	endpoint := alphaTickerURL + "?" + url.Values{"symbol": []string{symbol}}.Encode()
+
+	resp, err := client.Get(endpoint)
+	if err != nil {
+		log.Error().Err(err).Str("symbol", symbol).Msg("Failed to fetch Alpha ticker")
+		return 0, false
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return 0, false
+	}
+
+	var tickerResp AlphaTickerResponse
+	if err := json.NewDecoder(resp.Body).Decode(&tickerResp); err != nil {
+		return 0, false
+	}
+
+	if tickerResp.Code != "000000" {
+		return 0, false
+	}
+
+	price, err := strconv.ParseFloat(tickerResp.Data.Price, 64)
+	if err != nil || price <= 0 {
+		return 0, false
+	}
+
+	return price, true
+}