feat: arbitrage engine Phase 0 scaffold - FastAPI + Next.js

backend/main.py

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+from fastapi import FastAPI, HTTPException
+from fastapi.middleware.cors import CORSMiddleware
+import httpx
+from datetime import datetime, timedelta
+import asyncio
+
+app = FastAPI(title="Arbitrage Engine API")
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+BINANCE_FAPI = "https://fapi.binance.com/fapi/v1"
+SYMBOLS = ["BTCUSDT", "ETHUSDT"]
+
+
+@app.get("/api/health")
+async def health():
+    return {"status": "ok", "timestamp": datetime.utcnow().isoformat()}
+
+
+@app.get("/api/rates")
+async def get_rates():
+    async with httpx.AsyncClient(timeout=10) as client:
+        tasks = [client.get(f"{BINANCE_FAPI}/premiumIndex", params={"symbol": s}) for s in SYMBOLS]
+        responses = await asyncio.gather(*tasks)
+
+    result = {}
+    for sym, resp in zip(SYMBOLS, responses):
+        if resp.status_code != 200:
+            raise HTTPException(status_code=502, detail=f"Binance error for {sym}")
+        data = resp.json()
+        key = sym.replace("USDT", "")
+        result[key] = {
+            "symbol": sym,
+            "markPrice": float(data["markPrice"]),
+            "indexPrice": float(data["indexPrice"]),
+            "lastFundingRate": float(data["lastFundingRate"]),
+            "nextFundingTime": data["nextFundingTime"],
+            "timestamp": data["time"],
+        }
+    return result
+
+
+@app.get("/api/history")
+async def get_history():
+    end_time = int(datetime.utcnow().timestamp() * 1000)
+    start_time = int((datetime.utcnow() - timedelta(days=7)).timestamp() * 1000)
+
+    async with httpx.AsyncClient(timeout=15) as client:
+        tasks = [
+            client.get(
+                f"{BINANCE_FAPI}/fundingRate",
+                params={"symbol": s, "startTime": start_time, "endTime": end_time, "limit": 1000},
+            )
+            for s in SYMBOLS
+        ]
+        responses = await asyncio.gather(*tasks)
+
+    result = {}
+    for sym, resp in zip(SYMBOLS, responses):
+        if resp.status_code != 200:
+            raise HTTPException(status_code=502, detail=f"Binance history error for {sym}")
+        key = sym.replace("USDT", "")
+        result[key] = [
+            {
+                "fundingTime": item["fundingTime"],
+                "fundingRate": float(item["fundingRate"]),
+                "timestamp": datetime.utcfromtimestamp(item["fundingTime"] / 1000).isoformat(),
+            }
+            for item in resp.json()
+        ]
+    return result
+
+
+@app.get("/api/stats")
+async def get_stats():
+    end_time = int(datetime.utcnow().timestamp() * 1000)
+    start_time = int((datetime.utcnow() - timedelta(days=7)).timestamp() * 1000)
+
+    async with httpx.AsyncClient(timeout=15) as client:
+        tasks = [
+            client.get(
+                f"{BINANCE_FAPI}/fundingRate",
+                params={"symbol": s, "startTime": start_time, "endTime": end_time, "limit": 1000},
+            )
+            for s in SYMBOLS
+        ]
+        responses = await asyncio.gather(*tasks)
+
+    stats = {}
+    for sym, resp in zip(SYMBOLS, responses):
+        if resp.status_code != 200:
+            raise HTTPException(status_code=502, detail=f"Binance stats error for {sym}")
+        key = sym.replace("USDT", "")
+        rates = [float(item["fundingRate"]) for item in resp.json()]
+        if not rates:
+            stats[key] = {"mean7d": 0, "annualized": 0, "count": 0}
+            continue
+        mean = sum(rates) / len(rates)
+        annualized = mean * 3 * 365 * 100  # 3 settlements/day * 365 days * %
+        stats[key] = {
+            "mean7d": round(mean * 100, 6),       # as percent
+            "annualized": round(annualized, 2),   # as percent
+            "count": len(rates),
+        }
+
+    # 50-50 combo
+    btc_ann = stats.get("BTC", {}).get("annualized", 0)
+    eth_ann = stats.get("ETH", {}).get("annualized", 0)
+    btc_mean = stats.get("BTC", {}).get("mean7d", 0)
+    eth_mean = stats.get("ETH", {}).get("mean7d", 0)
+    stats["combo"] = {
+        "mean7d": round((btc_mean + eth_mean) / 2, 6),
+        "annualized": round((btc_ann + eth_ann) / 2, 2),
+    }
+
+    return stats

backend/requirements.txt

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+fastapi
+uvicorn
+httpx
+python-dotenv

frontend/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/versions
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# env files (can opt-in for committing if needed)
+.env*
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

frontend/README.md

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+This is a [Next.js](https://nextjs.org) project bootstrapped with [`create-next-app`](https://nextjs.org/docs/app/api-reference/cli/create-next-app).
+
+## Getting Started
+
+First, run the development server:
+
+```bash
+npm run dev
+# or
+yarn dev
+# or
+pnpm dev
+# or
+bun dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+
+You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file.
+
+This project uses [`next/font`](https://nextjs.org/docs/app/building-your-application/optimizing/fonts) to automatically optimize and load [Geist](https://vercel.com/font), a new font family for Vercel.
+
+## Learn More
+
+To learn more about Next.js, take a look at the following resources:
+
+- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
+- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+
+You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js) - your feedback and contributions are welcome!
+
+## Deploy on Vercel
+
+The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+
+Check out our [Next.js deployment documentation](https://nextjs.org/docs/app/building-your-application/deploying) for more details.

frontend/app/globals.css

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+@import "tailwindcss";
+
+:root {
+  --background: #0f172a;
+  --foreground: #e2e8f0;
+  --card: #1e293b;
+  --card-foreground: #e2e8f0;
+  --border: #334155;
+  --muted: #475569;
+  --cyan: #06b6d4;
+}
+
+@theme inline {
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  --font-sans: var(--font-geist-sans);
+  --font-mono: var(--font-geist-mono);
+}
+
+body {
+  background: var(--background);
+  color: var(--foreground);
+  font-family: Arial, Helvetica, sans-serif;
+}

frontend/app/layout.tsx

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+import type { Metadata } from "next";
+import { Geist, Geist_Mono } from "next/font/google";
+import "./globals.css";
+import Link from "next/link";
+
+const geistSans = Geist({
+  variable: "--font-geist-sans",
+  subsets: ["latin"],
+});
+
+const geistMono = Geist_Mono({
+  variable: "--font-geist-mono",
+  subsets: ["latin"],
+});
+
+export const metadata: Metadata = {
+  title: "Arbitrage Engine",
+  description: "Funding rate arbitrage monitoring system",
+};
+
+export default function RootLayout({
+  children,
+}: Readonly<{
+  children: React.ReactNode;
+}>) {
+  return (
+    <html lang="zh" className="dark">
+      <body
+        className={`${geistSans.variable} ${geistMono.variable} antialiased min-h-screen bg-slate-900 text-slate-100`}
+      >
+        {/* Top nav */}
+        <nav className="border-b border-slate-700 bg-slate-900/80 backdrop-blur sticky top-0 z-50">
+          <div className="max-w-6xl mx-auto px-4 h-14 flex items-center gap-8">
+            <span className="font-bold text-cyan-400 tracking-tight text-lg">
+              ⚡ Arbitrage Engine
+            </span>
+            <div className="flex gap-6 text-sm">
+              <Link
+                href="/"
+                className="text-slate-300 hover:text-cyan-400 transition-colors"
+              >
+                仪表盘
+              </Link>
+              <Link
+                href="/history"
+                className="text-slate-300 hover:text-cyan-400 transition-colors"
+              >
+                历史
+              </Link>
+              <Link
+                href="/about"
+                className="text-slate-300 hover:text-cyan-400 transition-colors"
+              >
+                说明
+              </Link>
+            </div>
+          </div>
+        </nav>
+
+        <main className="max-w-6xl mx-auto px-4 py-8">{children}</main>
+      </body>
+    </html>
+  );
+}

frontend/app/page.tsx

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+"use client";
+
+import { useEffect, useState, useCallback } from "react";
+import { api, RatesResponse, StatsResponse, HistoryResponse } from "@/lib/api";
+import RateCard from "@/components/RateCard";
+import StatsCard from "@/components/StatsCard";
+import FundingChart from "@/components/FundingChart";
+
+export default function Dashboard() {
+  const [rates, setRates] = useState<RatesResponse | null>(null);
+  const [stats, setStats] = useState<StatsResponse | null>(null);
+  const [history, setHistory] = useState<HistoryResponse | null>(null);
+  const [status, setStatus] = useState<"loading" | "running" | "error">("loading");
+  const [lastUpdate, setLastUpdate] = useState<string>("");
+
+  const fetchAll = useCallback(async () => {
+    try {
+      const [r, s, h] = await Promise.all([api.rates(), api.stats(), api.history()]);
+      setRates(r);
+      setStats(s);
+      setHistory(h);
+      setStatus("running");
+      setLastUpdate(new Date().toLocaleTimeString("zh-CN"));
+    } catch {
+      setStatus("error");
+    }
+  }, []);
+
+  useEffect(() => {
+    fetchAll();
+    const interval = setInterval(fetchAll, 30_000);
+    return () => clearInterval(interval);
+  }, [fetchAll]);
+
+  return (
+    <div className="space-y-6">
+      {/* Header */}
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-2xl font-bold text-slate-100">资金费率套利监控</h1>
+          <p className="text-slate-400 text-sm mt-1">实时监控 BTC / ETH 永续合约资金费率</p>
+        </div>
+        <div className="flex items-center gap-2 text-sm">
+          <span
+            className={`w-2 h-2 rounded-full ${
+              status === "running"
+                ? "bg-emerald-400 animate-pulse"
+                : status === "error"
+                ? "bg-red-400"
+                : "bg-slate-500"
+            }`}
+          />
+          <span className={status === "running" ? "text-emerald-400" : status === "error" ? "text-red-400" : "text-slate-400"}>
+            {status === "running" ? "运行中" : status === "error" ? "连接失败" : "加载中..."}
+          </span>
+          {lastUpdate && (
+            <span className="text-slate-500 ml-2">更新于 {lastUpdate}</span>
+          )}
+        </div>
+      </div>
+
+      {/* Rate Cards */}
+      <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
+        <RateCard asset="BTC" data={rates?.BTC ?? null} />
+        <RateCard asset="ETH" data={rates?.ETH ?? null} />
+      </div>
+
+      {/* Stats Cards */}
+      {stats && (
+        <div className="grid grid-cols-1 sm:grid-cols-3 gap-4">
+          <StatsCard
+            title="BTC 套利"
+            mean7d={stats.BTC.mean7d}
+            annualized={stats.BTC.annualized}
+            accent="cyan"
+          />
+          <StatsCard
+            title="ETH 套利"
+            mean7d={stats.ETH.mean7d}
+            annualized={stats.ETH.annualized}
+            accent="violet"
+          />
+          <StatsCard
+            title="50/50 组合"
+            mean7d={stats.combo.mean7d}
+            annualized={stats.combo.annualized}
+            accent="emerald"
+          />
+        </div>
+      )}
+
+      {/* History Chart */}
+      {history && (
+        <div className="rounded-xl border border-slate-700 bg-slate-800/50 p-6">
+          <h2 className="text-slate-200 font-semibold mb-4">过去7天资金费率走势</h2>
+          <FundingChart history={history} />
+        </div>
+      )}
+
+      {/* Strategy note */}
+      <div className="rounded-lg border border-slate-700 bg-slate-800/30 px-5 py-3 text-sm text-slate-400">
+        <span className="text-cyan-400 font-medium">策略原理：</span>
+        持有现货多头 + 永续空头，每8小时收取资金费率，赚取无方向风险的稳定收益。
+      </div>
+    </div>
+  );
+}

frontend/components/RateCard.tsx

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+"use client";
+
+import { RateData } from "@/lib/api";
+
+interface Props {
+  asset: "BTC" | "ETH";
+  data: RateData | null;
+}
+
+const ASSET_EMOJI: Record<string, string> = { BTC: "₿", ETH: "Ξ" };
+
+export default function RateCard({ asset, data }: Props) {
+  const rate = data?.lastFundingRate ?? null;
+  const positive = rate !== null && rate >= 0;
+  const rateColor = rate === null ? "text-slate-400" : positive ? "text-emerald-400" : "text-red-400";
+  const badgeColor = rate === null
+    ? "bg-slate-700 text-slate-300"
+    : positive
+    ? "bg-emerald-500/20 text-emerald-300 border border-emerald-500/30"
+    : "bg-red-500/20 text-red-300 border border-red-500/30";
+
+  const nextTime = data?.nextFundingTime
+    ? new Date(data.nextFundingTime).toLocaleTimeString("zh-CN", { hour: "2-digit", minute: "2-digit" })
+    : "--";
+
+  return (
+    <div className="rounded-xl border border-slate-700 bg-slate-800/60 p-6 space-y-4">
+      <div className="flex items-center justify-between">
+        <div className="flex items-center gap-2">
+          <span className="text-2xl font-bold text-slate-200">{ASSET_EMOJI[asset]}</span>
+          <span className="text-lg font-semibold text-slate-200">{asset}/USDT</span>
+        </div>
+        <span className={`text-xs px-2 py-1 rounded-full font-medium ${badgeColor}`}>
+          {rate === null ? "加载中" : positive ? "正费率 收款" : "负费率 付款"}
+        </span>
+      </div>
+
+      <div>
+        <p className="text-slate-400 text-xs mb-1">当前资金费率</p>
+        <p className={`text-3xl font-mono font-bold ${rateColor}`}>
+          {rate === null ? "--" : `${(rate * 100).toFixed(4)}%`}
+        </p>
+      </div>
+
+      <div className="grid grid-cols-2 gap-3 pt-2 border-t border-slate-700">
+        <div>
+          <p className="text-slate-500 text-xs">标记价格</p>
+          <p className="text-slate-200 font-mono text-sm mt-0.5">
+            ${data ? Number(data.markPrice).toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 }) : "--"}
+          </p>
+        </div>
+        <div>
+          <p className="text-slate-500 text-xs">下次结算</p>
+          <p className="text-cyan-400 font-mono text-sm mt-0.5">{nextTime}</p>
+        </div>
+      </div>
+    </div>
+  );
+}

frontend/components/StatsCard.tsx

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+"use client";
+
+interface Props {
+  title: string;
+  mean7d: number;
+  annualized: number;
+  accent: "cyan" | "violet" | "emerald";
+}
+
+const accentMap = {
+  cyan: {
+    border: "border-cyan-500/30",
+    bg: "bg-cyan-500/10",
+    text: "text-cyan-400",
+    label: "text-cyan-300",
+  },
+  violet: {
+    border: "border-violet-500/30",
+    bg: "bg-violet-500/10",
+    text: "text-violet-400",
+    label: "text-violet-300",
+  },
+  emerald: {
+    border: "border-emerald-500/30",
+    bg: "bg-emerald-500/10",
+    text: "text-emerald-400",
+    label: "text-emerald-300",
+  },
+};
+
+export default function StatsCard({ title, mean7d, annualized, accent }: Props) {
+  const c = accentMap[accent];
+  const isPositive = annualized >= 0;
+
+  return (
+    <div className={`rounded-xl border ${c.border} ${c.bg} p-5 space-y-3`}>
+      <h3 className={`text-sm font-medium ${c.label}`}>{title}</h3>
+
+      <div>
+        <p className="text-slate-400 text-xs">预估年化收益率</p>
+        <p className={`text-2xl font-bold font-mono mt-0.5 ${isPositive ? c.text : "text-red-400"}`}>
+          {annualized >= 0 ? "+" : ""}{annualized.toFixed(2)}%
+        </p>
+      </div>
+
+      <div className="pt-2 border-t border-slate-700/50">
+        <p className="text-slate-400 text-xs">7天均值费率</p>
+        <p className={`text-sm font-mono mt-0.5 ${c.text}`}>
+          {mean7d >= 0 ? "+" : ""}{mean7d.toFixed(4)}% / 8h
+        </p>
+      </div>
+    </div>
+  );
+}

frontend/eslint.config.mjs

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+import { defineConfig, globalIgnores } from "eslint/config";
+import nextVitals from "eslint-config-next/core-web-vitals";
+import nextTs from "eslint-config-next/typescript";
+
+const eslintConfig = defineConfig([
+  ...nextVitals,
+  ...nextTs,
+  // Override default ignores of eslint-config-next.
+  globalIgnores([
+    // Default ignores of eslint-config-next:
+    ".next/**",
+    "out/**",
+    "build/**",
+    "next-env.d.ts",
+  ]),
+]);
+
+export default eslintConfig;

frontend/lib/api.ts

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+const API_BASE = process.env.NEXT_PUBLIC_API_URL ?? "http://localhost:4330";
+
+export interface RateData {
+  symbol: string;
+  markPrice: number;
+  indexPrice: number;
+  lastFundingRate: number;
+  nextFundingTime: number;
+  timestamp: number;
+}
+
+export interface RatesResponse {
+  BTC: RateData;
+  ETH: RateData;
+}
+
+export interface HistoryPoint {
+  fundingTime: number;
+  fundingRate: number;
+  timestamp: string;
+}
+
+export interface HistoryResponse {
+  BTC: HistoryPoint[];
+  ETH: HistoryPoint[];
+}
+
+export interface AssetStats {
+  mean7d: number;
+  annualized: number;
+  count: number;
+}
+
+export interface StatsResponse {
+  BTC: AssetStats;
+  ETH: AssetStats;
+  combo: { mean7d: number; annualized: number };
+}
+
+async function fetchAPI<T>(path: string): Promise<T> {
+  const res = await fetch(`${API_BASE}${path}`, { cache: "no-store" });
+  if (!res.ok) throw new Error(`API error ${res.status}`);
+  return res.json();
+}
+
+export const api = {
+  rates: () => fetchAPI<RatesResponse>("/api/rates"),
+  history: () => fetchAPI<HistoryResponse>("/api/history"),
+  stats: () => fetchAPI<StatsResponse>("/api/stats"),
+  health: () => fetchAPI<{ status: string }>("/api/health"),
+};

frontend/next.config.ts

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+import type { NextConfig } from "next";
+
+const nextConfig: NextConfig = {
+  /* config options here */
+};
+
+export default nextConfig;

frontend/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "frontend",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "eslint"
+  },
+  "dependencies": {
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "lucide-react": "^0.575.0",
+    "next": "16.1.6",
+    "react": "19.2.3",
+    "react-dom": "19.2.3",
+    "recharts": "^3.7.0",
+    "tailwind-merge": "^3.5.0"
+  },
+  "devDependencies": {
+    "@tailwindcss/postcss": "^4",
+    "@types/node": "^20",
+    "@types/react": "^19",
+    "@types/react-dom": "^19",
+    "eslint": "^9",
+    "eslint-config-next": "16.1.6",
+    "tailwindcss": "^4",
+    "typescript": "^5"
+  }
+}

frontend/postcss.config.mjs

@@ -0,0 +1,7 @@
+const config = {
+  plugins: {
+    "@tailwindcss/postcss": {},
+  },
+};
+
+export default config;

frontend/public/file.svg

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+<svg fill="none" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><path d="M14.5 13.5V5.41a1 1 0 0 0-.3-.7L9.8.29A1 1 0 0 0 9.08 0H1.5v13.5A2.5 2.5 0 0 0 4 16h8a2.5 2.5 0 0 0 2.5-2.5m-1.5 0v-7H8v-5H3v12a1 1 0 0 0 1 1h8a1 1 0 0 0 1-1M9.5 5V2.12L12.38 5zM5.13 5h-.62v1.25h2.12V5zm-.62 3h7.12v1.25H4.5zm.62 3h-.62v1.25h7.12V11z" clip-rule="evenodd" fill="#666" fill-rule="evenodd"/></svg>

frontend/public/globe.svg

@@ -0,0 +1 @@
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frontend/public/next.svg

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frontend/public/vercel.svg

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+<svg fill="none" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1155 1000"><path d="m577.3 0 577.4 1000H0z" fill="#fff"/></svg>

frontend/public/window.svg

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frontend/tsconfig.json

@@ -0,0 +1,34 @@
+{
+  "compilerOptions": {
+    "target": "ES2017",
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "moduleResolution": "bundler",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "react-jsx",
+    "incremental": true,
+    "plugins": [
+      {
+        "name": "next"
+      }
+    ],
+    "paths": {
+      "@/*": ["./*"]
+    }
+  },
+  "include": [
+    "next-env.d.ts",
+    "**/*.ts",
+    "**/*.tsx",
+    ".next/types/**/*.ts",
+    ".next/dev/types/**/*.ts",
+    "**/*.mts"
+  ],
+  "exclude": ["node_modules"]
+}