diff --git a/balancer-js/examples/pools/join/gyro-join.ts b/balancer-js/examples/pools/join/gyro-join.ts
new file mode 100644
index 000000000..8d25821d9
--- /dev/null
+++ b/balancer-js/examples/pools/join/gyro-join.ts
@@ -0,0 +1,117 @@
+import { JsonRpcProvider } from "@ethersproject/providers";
+import { setTokenBalance, approveToken } from "@/../examples/helpers/erc20";
+import { formatEther, parseEther } from "@ethersproject/units";
+import { defaultAbiCoder } from "@ethersproject/abi";
+import { BalancerHelpers__factory, Vault__factory } from "@/contracts";
+import { queryJoinParams } from "@/modules/pools/queries/types";
+import { BigNumber } from "@ethersproject/bignumber";
+import { AddressZero } from "@ethersproject/constants";
+
+const bn = (value: number) => parseEther(`${value}`)
+const evm = (value: BigNumber | number) => String(parseEther(`${value}`))
+const hmn = (value: BigNumber | string) => Number(formatEther(value))
+
+const chainId = 137
+const poolId = '0xf0ad209e2e969eaaa8c882aac71f02d8a047d5c2000200000000000000000b49'
+const provider = new JsonRpcProvider('http://127.0.0.1:8545', chainId)
+const signer = provider.getSigner()
+const sMatic = '0x3a58a54c066fdc0f2d55fc9c89f0415c92ebf3c4'
+const wMatic = '0x0d500b1d8e8ef31e21c99d1db9a6444d3adf1270'
+let signerAddress: string
+
+const balancerHelpers = BalancerHelpers__factory.connect(
+    '0x239e55f427d44c3cc793f49bfb507ebe76638a2b',
+    signer
+);
+
+const vault = Vault__factory.connect(
+    '0xBA12222222228d8Ba445958a75a0704d566BF2C8',
+    signer
+);
+
+const buildParams = (
+    sender: string,
+    assets = [wMatic, sMatic],
+    limits = [],
+    bptOut = evm(1)
+) => [
+    poolId,
+    sender,
+    sender,
+    {
+        assets,
+        maxAmountsIn: limits,
+        userData: defaultAbiCoder.encode(
+            ['uint256', 'uint256'],
+            [3, bptOut]
+        ),
+        fromInternalBalance: false,
+    },
+] as queryJoinParams;
+
+const join = async () => {
+    // Build join
+    const params = buildParams(signerAddress, [wMatic, sMatic]);
+
+    // Query join
+    const join = await balancerHelpers.callStatic.queryJoin(...params)
+    console.log('Limits:', join.amountsIn.map(hmn))
+
+    // Set maxAmountsIn
+    params[3].maxAmountsIn = join.amountsIn
+
+    // Join pool
+    const { events } = await (await vault.joinPool(...params)).wait();
+    const poolBalanceChanged = events?.find((e) => e.event === 'PoolBalanceChanged')
+    const deltas = poolBalanceChanged?.args?.deltas
+
+    console.log('Deltas:', deltas.map(hmn))
+};
+
+const joinWithMatic = async () => {
+    // Build join
+    const params = buildParams(signerAddress, [AddressZero, sMatic]);
+
+    // Query join
+    const join = await balancerHelpers.callStatic.queryJoin(...params)
+    console.log('Limits:', join.amountsIn.map(hmn))
+
+    // Set maxAmountsIn
+    params[3].maxAmountsIn = join.amountsIn
+
+    // Join pool
+    const { events } = await (await vault.joinPool(...params, { value: join.amountsIn[0] })).wait();
+    const poolBalanceChanged = events?.find((e) => e.event === 'PoolBalanceChanged')
+    const deltas = poolBalanceChanged?.args?.deltas
+
+    console.log('Deltas:', deltas.map(hmn))
+};
+
+const priceImpact = async () => {
+    // Build join
+    const params000001 = buildParams(signerAddress, [wMatic, sMatic], [], evm(0.00001));
+    const join000001 = await balancerHelpers.callStatic.queryJoin(...params000001)
+    const params = buildParams(signerAddress, [wMatic, sMatic], [], evm(1));
+    const join = await balancerHelpers.callStatic.queryJoin(...params)
+    const params10000 = buildParams(signerAddress, [wMatic, sMatic], [], evm(10000));
+    const join10000 = await balancerHelpers.callStatic.queryJoin(...params10000)
+
+    // Query join - scales lineary
+    console.log(join000001.amountsIn.map(a => a.mul(1000000000)).map(hmn))
+    console.log(join.amountsIn.map(a => a.mul(10000)).map(hmn))
+    console.log(join10000.amountsIn.map(hmn))
+}
+
+const main = async () => {
+    signerAddress = await signer.getAddress()
+    await setTokenBalance(provider, signerAddress, sMatic, evm(100000), 0, false);
+    await setTokenBalance(provider, signerAddress, wMatic, evm(100000), 3, false);
+    await approveToken(sMatic, vault.address, evm(10), signer)
+    await approveToken(wMatic, vault.address, evm(10), signer)
+
+    await join();
+    await joinWithMatic();
+    await priceImpact()
+}
+
+main();