blockrun-mcp

claude mcp add blockrun -s user -- npx -y @blockrun/mcp@latest

BlockRun MCP is an open-source Model Context Protocol server that gives Claude — and any MCP-compatible agent — 19 tools for real-time data and real actions: 55+ LLMs, image & video generation, prediction-market data, live web/X search, on-chain queries across 40+ chains, and the ability to place real, USDC-settled bets on Polymarket. Authentication is a wallet signature (no API keys); you pay per call in USDC via the x402 protocol (no credit cards, no subscriptions). One self-custody wallet on Base or Solana. MIT licensed.

🏆 First of its kind — the signal → trade loop in Claude Code

Read live Polymarket odds and place the bet, from one self-custody wallet, pay-per-call. Jump to Polymarket trading →

Why BlockRun MCP exists

Every other data integration was built for human developers — create an account, copy an API key into .env, add a credit card, repeat for every vendor.

Agents can't do any of that. BlockRun MCP is built for the agent-first world:

• One wallet, every source — 19 tools behind a single self-custody wallet. No per-vendor signups.
• No API keys — your wallet signature is authentication.
• No credit cards — pay per request in USDC via x402, fractions of a cent each.
• Starts free — the free tier (blockrun_chat mode:"free", blockrun_dex, crypto blockrun_price, blockrun_models) costs $0.
• Reads and acts — most tools deliver data; blockrun_polymarket places real, confirm-gated trades.
• Self-custody — your key never leaves your machine (~/.blockrun/.session by default, 0600). BlockRun can't move your funds.

How it compares

✓ One wallet · ✓ Pay-per-call · ✓ Reads and trades · ✓ Multi-chain · ✓ Agent-ready · ✓ Open source

What changes

Before BlockRun, Claude can't answer:

• "What's the current Polymarket probability that Bitcoin hits $100k this year?"
• "Find me the top 5 papers on RAG published in the last 30 days."
• "What are people saying about @sama on X right now?"
• "What's the 24h volume on the PEPE/ETH pair on Uniswap?"
• "Polymarket has the Fed holding at 73% — put $2 on it." ← and now it can place the trade, not just read the odds.

After BlockRun, it can. Each query costs fractions of a cent, billed from a local USDC wallet. No subscriptions. No API dashboards. No key rotation.

Quick Start

1. Install

Claude Code (recommended)

claude mcp add blockrun -s user -- npx -y @blockrun/mcp@latest

-s user installs globally (available in every project). The -- separator ensures -y is passed to npx, not parsed by claude mcp add.

💡 Homebrew / nvm users: if the server doesn't connect, Claude Code likely can't find node/npx on its launcher PATH. Pass your shell PATH through — works on CLI and desktop:

claude mcp add blockrun -s user -e PATH="$PATH" -- npx -y @blockrun/mcp@latest

See Troubleshooting if it persists.

Claude Desktop — add to claude_desktop_config.json:

{
  "mcpServers": {
    "blockrun": { "command": "npx", "args": ["-y", "@blockrun/mcp"] }
  }
}

Cursor — add to ~/.cursor/mcp.json (macOS/Linux) or %APPDATA%\Cursor\mcp.json (Windows):

{
  "mcpServers": {
    "blockrun": { "command": "npx", "args": ["-y", "@blockrun/mcp@latest"] }
  }
}

Windsurf — same JSON, in:

• macOS: ~/.codeium/windsurf/mcp_config.json
• Linux: ~/.config/.codeium/windsurf/mcp_config.json
• Windows: %APPDATA%\Codeium\windsurf\mcp_config.json

2. Choose a tool profile (optional)

Expose a trimmed tool set so the client loads fewer schemas into context. Pass --profile <name> (or set BLOCKRUN_MCP_PROFILE); omit for the full set.

claude mcp add blockrun-trading -s user -- npx -y @blockrun/mcp@latest --profile trading

An unknown profile name falls back to full. modal and phone are full-profile only.

3. Fund your wallet

Run blockrun_wallet to see your address. The server pays on Base by default — send USDC on Base (Coinbase → USDC → Base network → paste address, or bridge via bridge.base.org).

$5 covers ~5,000 market queries · ~500 Exa searches · ~250 image generations · ~10 Seedance 1.5-pro clips.

Prefer Solana? See Fund your wallet — two tool calls, no restart.

4. Ask Claude anything

"What's Polymarket saying about the next Fed decision? If 'hold' is above 70%, put $2 on it."

Claude reads the odds with blockrun_markets and — with your confirmation — places the trade with blockrun_polymarket. One wallet. Gasless. Confirm-gated.

Demo

User: What's Polymarket saying about the Fed rate decision next month?

Claude: According to Polymarket, the market puts a 73% probability on the Fed holding rates steady, 24% on a 25bp cut, 3% on a hike. 24h volume: $2.1M. The "Hold" contract last traded at $0.73.

(via blockrun_markets · cost: $0.001)

User: Polymarket has Hawley at ~13% to announce a 2026 presidential run — put $1 on Yes.

Claude: Done — bought 7.63 shares of Yes at $0.131 ($1.00, market FOK). Real on-chain order, settled