# Robinhood Chain 測試網 RPC 入門：免 key 讀取、WebSocket 日誌，再切換主網

> Source: https://docs.blockvectra.com/zh-hant/guides/robinhood-testnet-starter/

BlockVectra 透過 JSON-RPC 與 WebSocket 提供 Robinhood Chain 測試網（Chain ID 46630），同一把 API key 也可用於 Robinhood Chain 主網。本指南依 [Robinhood Chain 測試網入門](https://github.com/blockvectra/robinhood-testnet-starter?ref=docs-testnet-starter) 範本走過三個步驟：免 key 讀取測試網、以程式化方式建立帳戶並串流日誌，然後將同一把 key 移到主網。端點參數、方法策略與代幣化股票資料，請參閱 [Robinhood Chain 指南](https://docs.blockvectra.com/zh-hant/guides/robinhood-chain/)。

## 執行範本

```bash
git clone https://github.com/blockvectra/robinhood-testnet-starter
cd robinhood-testnet-starter
npm install
npm run typecheck
```

Node.js 18 或以上。三個指令碼是 `npm run step1`、`npm run step2` 與 `npm run step3`。選用變數（`BLOCKVECTRA_API_KEY`、`WALLET_PRIVATE_KEY`）從 shell 讀取；不會自動載入 `.env`。

## 步驟 1：免 key 讀取測試網

公共端點 `https://api.blockvectra.com/v1/robinhood_testnet/public` 提供錢包 JSON-RPC 方法，無需帳戶與 API key。直接查詢 EIP-155 chain ID：

```bash
curl -s "https://api.blockvectra.com/v1/robinhood_testnet/public" \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_chainId","params":[]}'
```

回應為 `{"jsonrpc":"2.0","id":1,"result":"0xb626"}`；`0xb626` 是十六進位 chain ID，十進位為 46630。

範本從 `GET /v1/chains` 讀取鏈條目並據此建立 viem 用戶端，因此鏈名與 ID 並未寫死。以下節錄自 `src/shared.ts`：

```ts
import { createPublicClient, defineChain, http, webSocket } from "viem";

export const API_BASE = "https://api.blockvectra.com/v1";

export interface ChainEntry {
  chain: string;
  name: string;
  chain_id: number;
  data: boolean;
  ws: boolean;
  subscriptions: string[];
  public?: { url: string };
}

export async function getChain(slug: string): Promise<ChainEntry> {
  const res = await fetch(`${API_BASE}/chains`);
  if (!res.ok) throw new Error(`GET /v1/chains failed: ${res.status}`);
  const { chains } = (await res.json()) as { chains: ChainEntry[] };
  const entry = chains.find((c) => c.chain === slug);
  if (!entry) throw new Error(`${slug} not found in /v1/chains`);
  return entry;
}

export function toViemChain(entry: ChainEntry, rpcUrl: string) {
  return defineChain({
    id: entry.chain_id,
    name: entry.name,
    nativeCurrency: { name: "Ether", symbol: "ETH", decimals: 18 },
    rpcUrls: { default: { http: [rpcUrl] } },
  });
}

export function httpClient(entry: ChainEntry, url: string, apiKey?: string) {
  return createPublicClient({
    chain: toViemChain(entry, url),
    transport: http(url, apiKey ? { fetchOptions: { headers: { "x-api-key": apiKey } } } : undefined),
  });
}

export function wsClient(entry: ChainEntry, apiKey: string) {
  const base = "wss://api.blockvectra.com/v1";
  const url = `${base}/${entry.chain}/${apiKey}`;
  return createPublicClient({ chain: toViemChain(entry, url), transport: webSocket(url) });
}
```

有了該模組，`src/step1-public-read.ts` 會讀取 chain ID、最新區塊與一個地址餘額：

```ts
import { formatEther, type Address } from "viem";
import { API_BASE, getChain, httpClient } from "./shared.js";

const SLUG = "robinhood_testnet";
// Any address works; override with the first CLI argument.
const address = (process.argv[2] ?? "0x0000000000000000000000000000000000000000") as Address;

const chain = await getChain(SLUG);
const client = httpClient(chain, `${API_BASE}/${SLUG}/public`);

const [chainId, blockNumber, balance] = await Promise.all([
  client.getChainId(),
  client.getBlockNumber(),
  client.getBalance({ address }),
]);

console.log(`chain       : ${chain.name} (${SLUG})`);
console.log(`eth_chainId : ${chainId} (0x${chainId.toString(16)})`);
console.log(`block       : ${blockNumber}`);
console.log(`balance     : ${formatEther(balance)} ETH  (${address})`);
```

## 步驟 2：以程式化方式建立帳戶並訂閱日誌

`src/step2-key-and-logs.ts` 在 `https://console-api.blockvectra.com/v1` 使用錢包（SIWE、EIP-191）登入。首次登入會建立帳戶；用戶端接著建立 API key。新帳戶註冊即得 30,000,000 CU，無需信用卡。

```ts
import { generatePrivateKey, privateKeyToAccount } from "viem/accounts";
import type { Hex } from "viem";

const CONSOLE_API = "https://console-api.blockvectra.com/v1";
const REF = "gh-robinhood-testnet-starter";

async function post<T>(path: string, body: unknown, token?: string): Promise<T> {
  const res = await fetch(`${CONSOLE_API}${path}`, {
    method: "POST",
    headers: { "Content-Type": "application/json", ...(token ? { Authorization: `Bearer ${token}` } : {}) },
    body: JSON.stringify(body),
  });
  if (!res.ok) throw new Error(`${path} failed: ${res.status} ${await res.text()}`);
  return (await res.json()) as T;
}

async function provisionKey(): Promise<string> {
  const pk = (process.env.WALLET_PRIVATE_KEY as Hex | undefined) ?? generatePrivateKey();
  const account = privateKeyToAccount(pk);
  console.log(`wallet: ${account.address}`);

  // SIWE: ask for a challenge, sign it verbatim (EIP-191), log in. A first sign-in creates the account.
  const { message } = await post<{ message: string }>("/auth/siwe/challenge", {
    address: account.address,
    purpose: "login",
  });
  const signature = await account.signMessage({ message });
  const login = await post<{ session: { token: string }; account_created: boolean }>("/auth/siwe/login", {
    message,
    signature,
    ref: REF,
  });
  console.log(`account_created: ${login.account_created}`);

  const created = await post<{ api_key: string }>("/keys", { label: "robinhood-testnet-starter" }, login.session.token);
  return created.api_key;
}

const apiKey = process.env.BLOCKVECTRA_API_KEY?.trim() || (await provisionKey());
```

如果你已有 key，`export BLOCKVECTRA_API_KEY=...` 會略過建立帳戶。若未設定 `WALLET_PRIVATE_KEY`，指令碼會在記憶體中產生一個用完即丟的錢包，並在執行結束時丟棄；如果你想要再次登入同一個帳戶，請從本機環境設定 `WALLET_PRIVATE_KEY`。

WebSocket URL 會將 key 放在路徑中：`wss://api.blockvectra.com/v1/robinhood_testnet/{api_key}`。範本會在訂閱前檢查來自 `GET /v1/chains` 的即時 `ws` 旗標與 `subscriptions` 清單：

```ts
const chain = await getChain("robinhood_testnet");
if (!chain.ws || !chain.subscriptions.includes("logs")) {
  throw new Error(`robinhood_testnet does not offer a logs subscription in /v1/chains`);
}
console.log(`subscriptions (from /v1/chains): ${chain.subscriptions.join(", ")}`);

const client = wsClient(chain, apiKey);
const stop = client.watchEvent({
  address: "0x1234567890123456789012345678901234567890",
  onLogs: (logs) => {
    for (const l of logs) console.log(`block ${l.blockNumber} ${l.address} topic0=${l.topics[0]}`);
  },
  onError: (e) => console.error("subscription error:", e.message),
});
```

每個 `logs` 訂閱篩選器都必須包含 `address` 或 `topic0`；請將範例地址取代為你想關注的合約。篩選規則、關閉碼與重新連線，請參閱 [WebSocket 訂閱指南](https://docs.blockvectra.com/en/guides/websocket-subscriptions/)。

## 步驟 3：將同一把 key 切換到主網

切換到主網只需改一個字：使用代稱 `robinhood_mainnet` 與同一把 API key。`src/step3-mainnet.ts` 會讀取主網區塊號，並呼叫 Data API 取得 Robinhood 股票代幣：

```ts
const apiKey = process.env.BLOCKVECTRA_API_KEY?.trim();
if (!apiKey) throw new Error("Set BLOCKVECTRA_API_KEY (run step 2 first, or create a key in the console).");

const mainnet = await getChain("robinhood_mainnet");

// JSON-RPC with the key: the chain slug changes.
const client = httpClient(mainnet, `${API_BASE}/${mainnet.chain}`, apiKey);
console.log(`mainnet block: ${await client.getBlockNumber()}`);

// Data API: Robinhood stock-token leaderboard (see the Robinhood Chain guide).
const res = await fetch(`${API_BASE}/data/${mainnet.chain}/stocks`, { headers: { "x-api-key": apiKey } });
if (!res.ok) throw new Error(`Data API failed: ${res.status} ${await res.text()}`);
console.log(JSON.stringify(await res.json(), null, 2).slice(0, 2000));
```

以 curl 呼叫同一個排行榜端點：

```bash
curl -s -H "x-api-key: $BLOCKVECTRA_API_KEY" \
  "https://api.blockvectra.com/v1/data/robinhood_mainnet/stocks"
```

Data API 僅限主網：`GET /v1/chains` 對 `robinhood_testnet` 回報 `data: false`，對 `robinhood_mainnet` 回報 `data: true`。請求參數與回應結構，請參閱[代幣化股票指南](https://docs.blockvectra.com/zh-hant/guides/stocks/)。

## 從 API 探索限制與能力

讀取 `GET /v1/chains` 以取得即時的 `jsonrpc`、`data`、`ws` 與 `subscriptions` 旗標、允許的 JSON-RPC 方法、日誌區塊範圍、狀態保留期間，以及每條鏈的公共端點。讀取 `GET /v1/plans` 以取得目前價格與方案限制。

```bash
curl -s "https://api.blockvectra.com/v1/chains"
```

## 相關指南

* [尋找測試網 RPC URL 與限制](https://blockvectra.com/zh-hant/chains/robinhood_testnet/)。
* 發送交易前，先[從測試網 faucet 領取測試 ETH](https://docs.blockvectra.com/zh-hant/guides/robinhood-testnet-faucet/)。

## 下一步

* [瀏覽資料集目錄](https://blockvectra.com/zh-hant/data/)，查看 BlockVectra 索引的全部資料集。
* [查看免費方案與定價](https://blockvectra.com/zh-hant/pricing/#free)，確認你的帳戶包含哪些內容。
* [登入控制台](https://console.blockvectra.com/login/?next=%2Fkeys%2F)以建立 API key。