diff --git a/09-example-subRaydiumPrice/README.md b/09-example-subRaydiumPrice/README.md
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+# subscribes Raydium price
+
+This example subscribes to raydiumLiquidityPoolv4 pool transactions based on transactions filter conditions. By monitoring transactions of the raydiumLiquidityPoolv4 account, it obtains price change information for Raydium trading pairs.
+
+Run using “npm start”, the output should be as follows:：
+
+```bash
+[20:50:09.323] INFO: 3ef48CZQ7nAKKL6WGckFw9mhgXqA3Y9GvfY4qqsZHgKhD4BkchMx3KHL9ygbpJrM8mSi65u4hcfuMWBtDiFNgyjv : 3TDdSCw5xgBa4g6jk5oaQFGAaBcsP1Md7vEovrWzi2dE : 0.000019119343005368142
+[20:50:09.323] INFO: 31zV68Gnt67ap1fC1SGnv9n7xFTEETwsPCEqfAXJYxmpBYajLVSG1mP1uUTnMDoS2hPJsVbvFdLBXNPc87gtirPx : 3TDdSCw5xgBa4g6jk5oaQFGAaBcsP1Md7vEovrWzi2dE : 0.000019119343005368142
+[20:50:09.324] INFO: 66aZkhCvs47mVsjmQPKS9TLd81ZKKupyazPGsUz4gUqdzvtCkhyVZ4HH3LGxb51fxqaVnzjMTrdpWzEuRCYaCtqF : 3TDdSCw5xgBa4g6jk5oaQFGAaBcsP1Md7vEovrWzi2dE : 0.000019119343005368142
+[20:50:09.325] INFO: 2x98ttkvLtaWUyTBZdUFgpkMYFJ7W9AuF6YBrTuB6SG9YMiLS9LoYA1iTV5G8ZWB3LYstJJhRMHGK6tGBM9DEvpZ : 3TDdSCw5xgBa4g6jk5oaQFGAaBcsP1Md7vEovrWzi2dE : 0.000019119343005368142
+[20:50:09.325] INFO: 5AdiGuDXyzbc6bDXburrvufrch3Q3qEjmSTZNVhCtLJMDZD4tL2H17N5Lbn3Cie482ZD1AynhMwHS5km2RRunriE : 3TDdSCw5xgBa4g6jk5oaQFGAaBcsP1Md7vEovrWzi2dE : 0.000019119343005368142
+[20:50:09.329] INFO: 5CnHXDcUr6VYu9LDmYQsdfext5LFm53UjgBBvHcxbuFosT3HKVqy8oM4x8yt3g4re7DzPjqAFPe99W8yYke9uiUf : 3TDdSCw5xgBa4g6jk5oaQFGAaBcsP1Md7vEovrWzi2dE : 0.000019119343005368142
+[20:50:09.329] INFO: 3QtbbN9ts5TcstXgqCmKDe4mD1225CTLdNLc5G6dKVBZGDyQNBduY4jfveqWK3QmmfcWhnMwct72zQxQdypGSjXR : 3TDdSCw5xgBa4g6jk5oaQFGAaBcsP1Md7vEovrWzi2dE : 0.000019119343005368142
+^C[20:50:09.330] INFO: 65fE5d83qKJ4sZ9PYeMnerHUTekfF5kTqGoUGn6nWB2NTt3Yb4LggKGLSh2mAQCuchgPgGAAwbMpoKfJUvrKfVp5 : 3TDdSCw5xgBa4g6jk5oaQFGAaBcsP1Md7vEovrWzi2dE : 0.000019119343005368142
+```
+
+Output data explanation:
+First column: signature - Transaction signature
+Second column: mint - Trading pair mint
+Third column: price for sol
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diff --git a/09-example-subRaydiumPrice/index.ts b/09-example-subRaydiumPrice/index.ts
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+import Client, { CommitmentLevel, SubscribeRequest } from "@triton-one/yellowstone-grpc";
+import "dotenv/config";
+import bs58 from "bs58";
+
+const RAYDIUM_PROGRAM_ID = "675kPX9MHTjS2zt1qfr1NYHuzeLXfQM9H24wFSUt1Mp8";
+const SOL_MINT = "So11111111111111111111111111111111111111112";
+const RAYDIUM_AUTHORITY = "5Q544fKrFoe6tsEbD7S8EmxGTJYAKtTVhAW5Q5pge4j1";
+
+async function main() {
+
+    // 创建订阅客户端
+    // const client = new Client(
+    // 如遇到TypeError: Client is not a constructor错误
+    // 请使用以下方式创建
+    // 见 https://github.com/rpcpool/yellowstone-grpc/issues/428
+    // @ts-ignore
+    const client = new Client.default(
+        "https://test-grpc.chainbuff.com",
+        undefined,
+        {
+            "grpc.max_receive_message_length": 16 * 1024 * 1024, // 16MB
+        }
+    );
+
+    // 创建订阅数据流
+    const stream = await client.subscribe();
+
+    // 创建订阅请求
+    const request: SubscribeRequest = {
+        slots: {},
+        accounts: {},
+        transactions: {
+            transactionsSubKey: {
+                accountInclude: [RAYDIUM_PROGRAM_ID],
+                accountExclude: [],
+                accountRequired: []
+            }
+        },
+        transactionsStatus: {},
+        blocks: {},
+        blocksMeta: {},
+        accountsDataSlice: [],
+        entry: {},
+        commitment: CommitmentLevel.CONFIRMED
+    };
+
+    // 发送订阅请求
+    await new Promise<void>((resolve, reject) => {
+        stream.write(request, (err) => {
+            if (err === null || err === undefined) {
+                resolve();
+            } else {
+                reject(err);
+            }
+        });
+    }).catch((reason) => {
+        console.error(reason);
+        throw reason;
+    });
+
+    // 获取订阅数据
+    stream.on("data", async (data) => {
+        if (data?.transaction) {
+
+            const transaction = data.transaction.transaction;
+            if (!transaction) {
+                return;
+            }
+            const signature = bs58.encode(transaction.signature);
+
+            const preTokenBalances = transaction.meta.preTokenBalances;
+            const postTokenBalances = transaction.meta.postTokenBalances;
+            let targetToken = "", postPoolSOL = 0, postPoolToken = 0, prePoolSOL = 0, prePoolToken = 0, side = "";
+            for (const account of preTokenBalances) {
+                if (targetToken !== "" && prePoolSOL !== 0 && prePoolToken !== 0) break; // make sure we get the target token and pool sol balances and trader address only
+                if (account.owner === RAYDIUM_AUTHORITY && account.mint !== SOL_MINT) targetToken = account.mint;
+                if (account.owner === RAYDIUM_AUTHORITY && account.mint === SOL_MINT) {
+                    prePoolSOL = account.uiTokenAmount.uiAmount;
+                }
+                if (account.owner === RAYDIUM_AUTHORITY && account.mint !== SOL_MINT) {
+                    prePoolToken = account.uiTokenAmount.uiAmount;
+                }
+            }
+            for (const account of postTokenBalances) {
+                if (postPoolSOL !== 0 && postPoolToken !== 0) break; // make sure we get the target token and pool sol balances and trader address only
+                if (account.owner === RAYDIUM_AUTHORITY && account.mint !== SOL_MINT) targetToken = account.mint;
+                if (account.owner === RAYDIUM_AUTHORITY && account.mint === SOL_MINT) {
+                    postPoolSOL = account.uiTokenAmount.uiAmount;
+                }
+                if (account.owner === RAYDIUM_AUTHORITY && account.mint !== SOL_MINT) {
+                    postPoolToken = account.uiTokenAmount.uiAmount;
+                }
+            }
+            if (targetToken === "") return;
+            console.info(`${signature} : ${targetToken} : ${postPoolSOL / postPoolToken}`)
+
+        }
+    });
+
+    // 为保证连接稳定，需要定期向服务端发送ping请求以维持连接
+    const pingRequest: SubscribeRequest = {
+        accounts: {},
+        slots: {},
+        transactions: {},
+        transactionsStatus: {},
+        blocks: {},
+        blocksMeta: {},
+        entry: {},
+        accountsDataSlice: [],
+        commitment: undefined,
+        ping: { id: 1 },
+    };
+    // 每5秒发送一次ping请求
+    setInterval(async () => {
+        await new Promise<void>((resolve, reject) => {
+            stream.write(pingRequest, (err) => {
+                if (err === null || err === undefined) {
+                    resolve();
+                } else {
+                    reject(err);
+                }
+            });
+        }).catch((reason) => {
+            console.error(reason);
+            throw reason;
+        });
+    }, 5000);
+}
+
+
+
+main();
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