ScalpStream Data MCP server

ScalpStream MCP server

An MCP server that buys small, factual datasets at call time with your own wallet, over x402 — roughly $0.01 a call, no account, no subscription, no API key anywhere in the flow.

Most MCP servers wrap an API you already hold a key for. This one pays as it goes. The seller holds no keys either: settlement runs through a facilitator that sponsors gas, so the only key in the system is yours, held in memory for the lifetime of the process and never written anywhere.

It is useful before you fund anything. With no key configured, every paid tool returns the free preview and the exact quoted price, so you can see what you would be buying before deciding to buy it.

Tools

Install

go install github.com/DV1-321/scalpstream-mcp/cmd/scalpmcp@latest

Configure

Claude Desktop (claudedesktopconfig.json), Claude Code, or any MCP client:

{
  "mcpServers": {
    "scalpstream": {
      "command": "scalpmcp",
      "env": {
        "EVM_BASE_PRIVATE_KEY": "0x...",
        "SCALPMCP_MAX_PRICE_USD": "0.10",
        "SCALPMCP_BUDGET_USD": "2.00"
      }
    }
  }
}

Omit env entirely to run in preview-only mode.

Spending safety

Real money moves, so the design refuses rather than overspends:

and never reaches the network.

• Both limits are checked before anything is signed. A refusal costs nothing

must not become unbounded spending.

• An unset limit means the default, never "unlimited." A missing config line

request then fails, the error says settlement state is unknown rather than implying nothing moved — you may need to reconcile against the chain.

• Spend is recorded only when the data is actually delivered. If a paid

• Gas is sponsored by the facilitator, so the wallet needs USDC and no ETH.

Use a throwaway key funded with a dollar or two. Never one holding balances you care about.

Payment rails

Sellers accept USDC on Base, Arbitrum and Polygon, and XRP or RLUSD on the XRP Ledger. This client pays USDC on Base, preferring it over other EVM rails regardless of the order the server lists them in.

What the data is not

Shortened. The full README is on GitHub.