Alchemy: Blockchain Data Access for Agents

Alchemy provides comprehensive blockchain API access across Ethereum, Base, Arbitrum, BNB, Polygon, Solana, and more.

Three ways to access:

• API key: Set $ALCHEMY_API_KEY and make requests directly. Full access to all products. Create a free key at dashboard.alchemy.com.
• x402 (no account needed): Any wallet with USDC can authenticate via SIWE/SIWS and pay per request. Supports EVM and Solana wallets. Install @alchemy/x402 and @x402/fetch.
• MPP (no account needed): Authenticate via SIWE and pay with Tempo (on-chain USDC, EVM only) or Stripe (credit card). Install mppx.

Access Method Selection (Required)

Before the first network call, determine which access method to use:

1. Is ALCHEMY_API_KEY set? → Use the API Key path. Skip to API Key Access.
2. No API key? → Ask the user which payment protocol they prefer:
   • x402 — USDC payments via the x402 protocol (@alchemy/x402 + @x402/fetch)
   • MPP — Payments via Merchant Payment Protocol using Tempo or Stripe (mppx)