alchemyplatform/alchemy-x402

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# @alchemy/x402 CLI and library for Alchemy x402 authentication and payments. Handles SIWE (Sign-In With Ethereum) and SIWS (Sign-In With Solana) auth, plus x402 per-request payments for the Alchemy agentic gateway. ## Install ```bash npm install @alchemy/x402 # or yarn add @alchemy/x402 # or pnpm add @alchemy/x402 # or bun add @alchemy/x402 ``` ## CLI All commands accept an `--architecture` flag to switch between EVM and SVM (Solana). Defaults to `evm`. ### EVM (Ethereum, Base, etc.) ```bash # Generate a new EVM wallet npx @alchemy/x402 wallet generate # Import an existing wallet (accepts hex key or path to a key file) npx @alchemy/x402 wallet import --private-key 0xac09... npx @alchemy/x402 wallet import --private-key /path/to/keyfile # Generate a SIWE token npx @alchemy/x402 sign --private-key /path/to/keyfile --expires-after 1h # Create an x402 payment from a PAYMENT-REQUIRED header npx @alchemy/x402 pay --private-key /path/to/keyfile --payment-required <header> ``` ### SVM (Solana) ```bash # Generate a new Solana wallet npx @alchemy/x402 wallet generate --architecture svm # Import an existing wallet (accepts base58 key, JSON byte array, or path to a key file) npx @alchemy/x402 wallet import --private-key <base58-key> --architecture svm npx @alchemy/x402 wallet import --private-key /path/to/keyfile --architecture svm # Generate a SIWS token npx @alchemy/x402 sign --private-key /path/to/keyfile --expires-after 1h --architecture svm # Create an x402 payment from a PAYMENT-REQUIRED header npx @alchemy/x402 pay --private-key /path/to/keyfile --payment-required <header> --architecture svm ``` ## Library ```ts import { // EVM signSiwe, generateWallet, getWalletAddress, createPayment, buildX402Client, // SVM (Solana) signSiws, generateSolanaWallet, getSolanaWalletAddress, createSolanaPayment, buildSolanaX402Client, // Enum Architecture, } from "@alchemy/x402"; ``` ### Generate a wallet ```ts // EVM const evmWallet = generateWallet(); // { privateKey: "0x...", address: "0x..." } const evmAddress = getWalletAddress("0x<private-key>"); // SVM (Solana) const solWallet = generateSolanaWallet(); // { privateKey: "<base58>", address: "<base58>" } const solAddress = getSolanaWalletAddress("<base58-secret-key>"); ``` ### Sign an authentication token ```ts // EVM — SIWE (Sign-In With Ethereum) const siweToken = await signSiwe({ privateKey: "0x<private-key>", expiresAfter: "1h", // optional, default "1h" }); // SVM — SIWS (Sign-In With Solana) const siwsToken = await signSiws({ privateKey: "<base58-secret-key>", expiresAfter: "1h", // optional, default "1h" }); ``` ### Create an x402 payment ```ts // EVM const evmPayment = await createPayment({ privateKey: "0x<private-key>", paymentRequiredHeader: "<base64-encoded PAYMENT-REQUIRED header>", }); // SVM (Solana) const solPayment = await createSolanaPayment({ privateKey: "<base58-secret-key>", paymentRequiredHeader: "<base64-encoded PAYMENT-REQUIRED header>", }); ``` ### Use with @x402/fetch For full request orchestration with automatic 402 payment handling, use `buildX402Client` with `@x402/fetch`: ```ts import { buildX402Client, signSiwe } from "@alchemy/x402"; import { wrapFetchWithPayment } from "@x402/fetch"; const privateKey = "0x<private-key>"; const client = buildX402Client(privateKey); const siweToken = await signSiwe({ privateKey }); // Wrap fetch with SIWE auth const authedFetch: typeof fetch = async (input, init) => { const headers = new Headers(init?.headers); headers.set("Authorization", `SIWE ${siweToken}`); return fetch(input, { ...init, headers }); }; // Wrap with automatic x402 payment handling const paymentFetch = wrapFetchWithPayment(authedFetch, client); const response = await paymentFetch("https://x402.alchemy.com/..."); ``` ## Private key input ### EVM All EVM commands and functions accept private keys as: - Hex string with `0x` prefix: `0xac09...` - Raw hex string: `ac09...` - File path: `/path/to/keyfile` ### SVM (Solana) All SVM commands and functions accept private keys as: - Base58-encoded 64-byte secret key - JSON byte array (Solana CLI format): `[1, 2, 3, ...]` - File path containing either format: `/path/to/keyfile` ## For maintainers See [MAINTAINERS.md](./MAINTAINERS.md).

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2026-03-11

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