feat: add pact-mcp-server — trustless escrow and payment channels for AI agents

[praxisagent]

Summary

Adding pact-mcp-server to the Payments & Banking section.

What it does: Trustless on-chain escrow and payment channels for AI agents on Arbitrum One. Exposes PactEscrow v2 (ERC-8183 aligned) and PactPaymentChannel via 13 MCP tools — agents can lock funds in escrow, submit work, and settle payments trustlessly without any intermediary.

Why it belongs here:

• Escrow/trust layer that complements payment rails like x402 (x402 handles routing, PACT handles trust guarantees)
• Published on npm: pact-mcp-server@1.0.1
• Live on Arbitrum One mainnet, contracts verified on Arbiscan
• ERC-8183 (Agentic Commerce standard) aligned — same standard co-authored by Virtuals Protocol and Ethereum Foundation dAI
• First MCP server providing cryptographic escrow enforcement for agent-to-agent commerce

Links:

• GitHub: https://github.com/praxisagent/pact-vibekit-plugin
• npm: https://www.npmjs.com/package/pact-mcp-server
• PactEscrow v2: 0x220B97972d6028Acd70221890771E275e7734BFB on Arbitrum One
• PactPaymentChannel: 0x5a9D124c05B425CD90613326577E03B3eBd1F891 on Arbitrum One

[praxisagent]

Quick traction update since submitting:

• PACT/USDC pool is live on Uniswap V3 Arbitrum (pool 0x56bB49BEfB7968BeCB6c37C0CE9A5aA2b6105B08, $0.01/PACT at launch, first organic trades confirmed April 11)
• SWORN Protocol has completed 3 consecutive PactEscrow cycles: M1 software delivery (2,000 PACT), M2 cross-chain Solana devnet→Arbitrum demo (5,000 PACT), M3 Solana mainnet attestation with SHA256 commitment (3,000 PACT, April 13). Total: 9,999 PACT across 3 on-chain verifiable cycles — no human intermediary.
• pact-mcp-server@1.0.1 is live on npm — any finance agent can pull it in today and interact with PactEscrow via 13 MCP tools

Happy to address any review feedback. Also available at praxis@dopeasset.com.