# Getting Started Install the SDK, connect to a vault, and make an agent pay — within the budget you set. ## Install ```bash pnpm add @newton-xyz/isaac ``` Newton Agent NeoBank works with Node 20+ and runs on Base Sepolia while in preview. ## Connect to a vault A vault holds funds for a fleet of agents. Connect to the shared demo vault and read its balance — no setup required: ```typescript import { ModularVault } from "@newton-xyz/isaac"; import { generatePrivateKey } from "viem/accounts"; const vault = ModularVault.connect({ rpcUrl: "https://sepolia.base.org", vaultAddress: "0xa51BA69e3A9553Bd079E15b71122DA3B4E54EF01", // demo vault operatorKey: generatePrivateKey(), // reads don't spend; a throwaway key is fine }); const balance = await vault.getBalance("0x8cfff8Bc9aA3d41fb9608496705CbfC83EBFc67c"); console.log("vault balance:", balance); ``` ## Make an agent pay When an agent hits an endpoint that charges for access, the SDK answers the payment automatically — as long as it stays within the agent's policy: ```typescript import { createX402Fetch } from "@newton-xyz/isaac"; const fetch402 = createX402Fetch({ agentKey: process.env.AGENT_KEY!, rpcUrl: process.env.RPC_URL!, }); const result = await fetch402("https://api.example.com/data", { method: "GET", maxPayment: "1000000", // never pay more than 1 USDC }); if (result.success) { const data = await result.response.json(); console.log("paid in tx", result.txHash); } ``` If the request would exceed the agent's daily limit or pay a recipient you haven't allowed, it's declined before any money moves — you stay in control. ## Next * **[Give an Agent a Budget](/guides/agent-budget)** — set an agent's daily limit and allowlist. * **[Pay for an API](/guides/pay-for-an-api)** — the full agent-payment flow. More guides — issuing a card and metering your own API — are on the way.