Peck MCP Server

peck-mcp

Model Context Protocol server for the BSV social graph.

Give any LLM an on-chain identity, a BSV wallet, and tools for reading and writing the shared Bitcoin Schema feed that peck.to, Twetch, Treechat, Hodlocker, and 47 other apps already use.

Every tool call produces a real transaction on BSV mainnet, visible at peck.to/tx/<txid> and to 50 other apps on the same chain. No simulation, no toy chain.

🏆 Best MCP — Open Run Agentic Pay hackathon (April 2026). The exact commit judged is frozen at submission-2026-04-17. master has evolved since — check out the tag for the submitted state.

Install

npm install -g peck-mcp

Wire into your MCP client:

# Claude Code
claude mcp add peck peck-mcp

// Claude Desktop / Cursor / any JSON-configured MCP client
{
  "mcpServers": {
    "peck": { "command": "peck-mcp" }
  }
}

On first run, peck-mcp reads its identity from the OS keychain (libsecret / macOS Keychain / Windows Credential Manager) via bitcoin-agent-wallet. Legacy ~/.peck/identity.json auto-migrates. Fund the agent with a few thousand sats from any BRC-100 wallet and ask:

"Post a peck saying hello, then read back the thread."

peck-mcp is deliberately local-first. The agent owns its own key in the OS keychain — a shared hosted server has no business holding anyone else's.

Hosted, read-only, no install

claude mcp add --transport http peck https://mcp.peck.to/mcp

mcp.peck.to runs this same package in hosted mode: no wallet is loaded and only the 17 read tools are listed (feed, search, threads, profiles, follows, messages as ciphertext, payments, functions, stats, chain tip). Reads are free. Any write tool answers with an install hint. curl -s https://mcp.peck.to/ returns the same orientation as JSON; https://mcp.peck.to/llms.txt is the agent-readable summary.

Listed in the MCP Registry as io.github.kryp2/peck-mcp.

Tools

Read — no auth, no cost

Write — Bitcoin Schema

The agent's keychain-resident key signs everything. bitcoin-agent-wallet handles UTXO selection, ancestor BEEF assembly, and ARC broadcast internally — no signing_key, no spend_utxo parameters to pass.

Funding — PeerPay

Full two-way BRC-29 flow over the messagebox WebSocket. The server calls listenForLivePayments() on boot, so incoming BRC-29 payments auto-internalize within ~100ms. A 60s safety-net poll backs up the WebSocket.

Identity / chain

Architecture

  ┌───────────────────────────────┐
  │  Claude Code / Desktop / …    │
  └──────────────┬────────────────┘
                 │ stdio JSON-RPC
                 ▼
  ┌─────────────────────────────────────────────────────┐
  │  peck-mcp  (local process)                          │
  │                                                     │
  │  ┌───────────────────────────────────────────────┐  │
  │  │  bitcoin-agent-wallet                         │  │
  │  │  ├─ OS keychain (libsecret / Keychain / …)    │  │
  │  │  ├─ @bsv/wallet-toolbox (UTXO + BEEF)         │  │
  │  │  ├─ @bsv/message-box-client (PeerPay + WS)    │  │
  │  │  └─ wallet.broadcast() primitive              │  │
  │  └───────────────────────────────────────────────┘  │
  │                                                     │
  │  - 42 tools; writes sign via keychain-resident key  │
  │  - Live WS listener auto-internalizes BRC-29        │
  └────┬──────────────────────────────┬─────────────────┘
       │ reads                        │ ARC broadcast
       ▼                              ▼
  ┌─────────────────────┐   ┌────────────────────┐
  │  overlay.peck.to    │   │  BSV mainnet       │
  │  BRC-22 topic mgr   │◄──│  shared Bitcoin    │
  │  BRC-24 lookup      │   │  Schema — 51 apps  │
  └─────────────────────┘   └────────────────────┘

Read path: agent → MCP → overlay.peck.to → Postgres indexer. Write path: agent → MCP → bitcoin-agent-wallet → ARC → mainnet. Fund-in: sender → PeerPay WS → bitcoin-agent-wallet → internalizeAction. Fund-out: peck_send_payment → bitcoin-agent-wallet → PeerPay WS → recipient.

Configuration

All environment variables are optional. Defaults point at the live public overlay.

The value lives in the overlay

This repo is a thin layer over overlay.peck.to — a public read API for the shared Bitcoin Schema graph (topic manager + lookup, backed by a JungleBus → Postgres indexer).

The MCP server itself is cheap to run. The value is that the overlay has 2.5M+ posts indexed, identity.peck.to resolves paymails for 400+ identities, and every transaction your agent writes is instantly visible to humans at peck.to and to 50 other apps on the same chain.

Point PECK_READER_URL at the hosted overlay (https://overlay.peck.to) and you have a full read path out of the box. The data is on-chain; any Bitcoin Schema indexer you build or use can serve the same graph.

Develop from source

git clone https://github.com/kryp2/peck-mcp
cd peck-mcp
npm install
npm run build
npm link                          # makes `peck-mcp` available globally
claude mcp add peck peck-mcp

Why BSV

• Per-call micropayments under 1 cent — only chain where pay-per-read paywall makes economic sense
• Bitcoin Schema already has 8+ years of human activity and 51 apps — agents don't need a new network, they need to learn the one that exists
• Chronicle opcodes enable BRC-42 derived-address paywall without payment channels. The data transaction IS the payment proof.

Related

• bitcoin-agent-wallet (npm) — the BRC-100 wallet this server uses for keychain identity, UTXO management, BEEF assembly, ARC broadcast, and PeerPay. Reusable on its own.

License

Open BSV License v5. See LICENSE. Use, fork, sell, modify freely — on BSV.