OWL

justaguy

claude-sonnet-4-6claude-codeMCP server (Model Context Protocol) with direct tool callingMoonPay CLI (@moonpay/cli)MCP SDK (@modelcontextprotocol/sdk)better-sqlite3grammytsup+1

Problem Statement

OWS solves wallet infrastructure for a single agent but has no answer for what happens when multiple agents need to coordinate around the same wallet. There is no way for one agent to propose a transaction on another agent's wallet without the host sharing keys. OWS's policy engine covers owner-level constraints (spending limits, allowlists) but has no concept of per-peer policies for delegated access. There is no audit trail for tool calls, no simulation layer before broadcast, and no push-based monitoring. OWL fills these gaps by extending OWS with tunnel-based delegation (auth via OWS signMessage, keys never leave the host), a new policy category for inter-agent access control, an append-only SQLite ledger, dry-run simulation, and reactive alerts. Every operation still goes through OWS. OWL proves the standard is extensible and ready for multi-agent production use.

OWL: MCP extension for OWS OWL is built on MoonPay's Open Wallet Standard (OWS) and OWS Primitive. It pushes OWS from single-agent wallet management into multi-agent coordination infrastructure. How OWL relates to OWS: Implements: Proxies all 13 OWS tools transparently through a single MCP server. Every wallet operation (swap, transfer, bridge, sign, balance) goes through OWS. OWL never touches keys. Extends: Adds inter-agent delegation policies on top of OWS's policy engine. Per-peer spending limits, token whitelists, operation whitelists, and auto-approve thresholds scoped to tunnel connections. Builds on: Six new infrastructure primitives layered on OWS without forking or modifying the standard. Six Primitives: 1. Tunnels - Delegated wallet access without key exposure. Auth via OWS signMessage challenge-response. Per-peer policy engine. 2. Activity Ledger - Append-only SQLite audit trail for every tool call. Query, aggregate, export (JSON/CSV). 3. Dry Run - Pre-execution simulation for swaps, transfers, and bridges before committing funds. 4. Alerts - Reactive price and balance monitoring. Dispatches to Telegram and webhooks. 5. Reports - Spending summaries (daily/weekly/monthly) and unified cross-wallet portfolio view. 6. Terminal - Agent-native TUI with AI setup wizard supporting OpenRouter, OpenAI, and Ollama. Stack: - 35 MCP tools (22 owl + 13 mp) through one server, compatible with any LLM - 10 chains: Solana, Ethereum, Base, Polygon, Arbitrum, Optimism, BNB, Avalanche, TRON, Bitcoin - npm: moonpay-owl - Docs: owl-moonpay.vercel.app/docs - License: CC0 OWL demonstrates that OWS's design (local keys, policy engine, MCP interface) is composable. Third parties can layer domain-specific infrastructure on top without touching the standard itself.