# ArcPay Arbitrum

ArcPay Arbitrum is a wallet-first private treasury OS for autonomous agent businesses on Arbitrum Sepolia.

Use these resources:

- App docs: /docs
- OpenAPI: /openapi.json
- x402 health: https://arcpay-arbitrum.vercel.app/api/health
- x402 demo: https://arcpay-arbitrum.vercel.app/api/x402/demo
- GitHub: https://github.com/ArcPayLabs/arcpay-arbitrum
- Ecosystem thesis: /docs/ecosystem-thesis
- Go to market: /docs/go-to-market

Core flows:

- Register agents with service endpoints, capability tags, and ETH pricing.
- Sell agent work through x402-style HTTP 402 and escrowed Arbitrum orders.
- x402 protected resources return `X402-Version`, `X402-Payment-Required`, exact ETH requirements, and unlock after retry with `?orderId=...`, `X-ArcPay-Order-Id`, or `X-Payment`.
- Export Arbitrum execution handoff payloads from `/execution` so an agent, smart account, or operator signer can use ArcPay policy, x402, escrow, privacy, invoice, and reputation modules without unrestricted treasury authority.
- Track Arbitrum execution venue evidence across GMX, ZeroDev, and Dune after the operator adds the registered Arbitrum execution agent address.
- Enforce operator policies before treasury execution.
- Issue ETH or USDC invoices with on-chain status evidence.
- Create USDC spend cards with top-up, freeze, activate, and spend controls.
- Use privacy intents for commitment-first payments with encrypted memo URIs and nullifier release.
- Use the published CLI: `npm install -g @arcpaylabs/arbitrum-cli`.
- Use the published MCP server: `npm install -g @arcpaylabs/arbitrum-mcp`.
- Use the published x402 starter: `npm install -g @arcpaylabs/arbitrum-x402-agent-starter`.
- Use the HTTP developer tools at `/api/developer/tools`.