alchemy
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_KEYand 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/x402and@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:
- Is
ALCHEMY_API_KEYset? → Use the API Key path. Skip to API Key Access. - 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)
- x402 — USDC payments via the x402 protocol (
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