AgentSmith payment SDK

Install agentsmith-x402-sdk for Seller payment middleware and Node Buyer paid fetch. Requires Node.js 24+ and ES modules ("type": "module"). Reuses official x402 packages for exact payments and includes local experimental upto adapters; no copied adapter or dependency patch is required.

Install the SDK

npm install agentsmith-x402-sdk
# Sellers using Express (including NestJS with the Express adapter):
npm install express @x402/express@2.23.0

Entry	Use
agentsmith-x402-sdk/seller/express	createPaymentMiddleware, setSettlementOverrides — Express and NestJS with the Express adapter
agentsmith-x402-sdk/seller	createResourceServer — compose native x402 server integrations
agentsmith-x402-sdk/buyer	createBuyerFetch — Node signing and paid fetch

• Seller integration
• Buyer integration