Start with MeterKit

Install a protected Solana devnet API and inspect its first x402 challenge.

Section: Start
Maturity: recommended
Applies to: >=0.2.0 <0.3.0
Last reviewed: 2026-08-10

MeterKit adds non-custodial USDC payments to APIs and MCP tools. The provider receives settlement directly; MeterKit does not hold funds or private keys.

Install the public SDK in an existing service, then choose an integration. Understand the payment lifecycle before moving beyond the unpaid challenge.

pnpm add @usemeterkit/[email protected] express

The initializer is not yet an npm release. From an exact repository commit, run pnpm create:meterkit ../demo --surface express --package-manager pnpm --yes.