camp-mcp

Query Arbitrum One on-chain data from any AI agent — no API key, no signup.

An MCP server over camp, the free Dune-class data API for Arbitrum One. Point Claude, Cursor, or any MCP client at it and ask:

"What were the biggest USDC transfers on Arbitrum in the last hour?" "Show me the latest Uniswap v3 swaps in the USDC/WETH pool." "Write SQL to count transactions per block over the last 5,000 blocks and run it."

It's a thin, stateless wrapper — your agent calls camp's public REST API. Nothing to host.

Tools

| Tool | What it does | |---|---| | status | Chain tip, indexed range, history depth (call first) | | sql | Run a read-only DataFusion SELECT (the power tool — Dune-style) | | sql_help | Tables, columns, UDFs, and example queries for sql | | transfers | Decoded ERC-20/721 Transfers (chain-wide or per token) | | whale_transfers | Large transfers ($1M+ USDC by default) | | token_volume | Bucketed transfer count + volume for an ERC-20 | | address_activity | A wallet/contract's txs, transfers, or interactions | | events | Raw log filter (chain-wide or by address/topic) | | uniswap_v3 | Decoded v3 swap/mint/burn (defaults to USDC/WETH 0.05%) | | block / tx | Look up a block or transaction |

Every tool works with zero/minimal args — bare calls return live data near the chain tip.

Setup

Requires Node ≥ 18. No install needed beyond npx.

Claude Code

claude mcp add camp -- npx -y camp-mcp

Claude Desktop — add to claude_desktop_config.json:

{
  "mcpServers": {
    "camp": { "command": "npx", "args": ["-y", "camp-mcp"] }
  }
}

Cursor — add to ~/.cursor/mcp.json (same shape as above).

Restart the client; "camp" and its tools will appear.

Configuration (optional)

| Env var | Default | Purpose | |---|---|---| | CAMP_BASE_URL | https://engine.camp | Point at your own camp node | | CAMP_TOKEN | — | Anonymous bearer for higher rate limits (mint via POST /v1/tokens) |

{
  "mcpServers": {
    "camp": {
      "command": "npx",
      "args": ["-y", "camp-mcp"],
      "env": { "CAMP_TOKEN": "camp_xxx" }
    }
  }
}

Notes

• Rolling window. camp keeps a recent window of Arbitrum history (currently ~15 days, growing toward ~30). It's built for fresh data, not deep history. status reports the exact queryable block range.
• SQL must filter on block_num and stay within ~100k blocks per query. Ask the agent to call status then sql_help before composing a query.
• Anonymous limits apply (30 req/min · 500/hour per IP); set CAMP_TOKEN to raise them.

MIT licensed. Part of camp.