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ArcPay ships a local CLI: 
npm run arcpay -- help
For external developers, the CLI package is published on npm: 
npm install -g @arcpaylabs/somnia-cli
arcpay-somnia contracts

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Common Commands

npm run arcpay -- contracts
npm run arcpay -- wallet
npm run arcpay -- agent-id research-agent
npm run arcpay -- invoice-id inv_001
npm run arcpay -- claim-hash claim-research-agent-001
npm run arcpay -- privacy-commit "invoice-secret"
npm run arcpay -- privacy-guide
npm run arcpay -- invoice-guide
npm run arcpay -- x402-guide
npm run arcpay -- defi-adapters
npm run arcpay -- demo-path
npm run arcpay -- smoke
npm run arcpay -- mcp-config
The CLI helps builders derive contract IDs, print deployment addresses, configure MCP, and run repeatable proof flows.