x402 Money Farm — MCP server

Paid web-extraction tools for agents. No account, no API key, no subscription, no signup form: each call settles a fraction of a cent in USDC on Base, per request, and the response arrives only after settlement.

Tool	What it returns	Price
`farm_catalog`	Everything below, with live prices and wallet status	free
`farm_clean_text`	Main article text without nav/ads/boilerplate, text or Markdown	$0.02
`farm_metadata`	Title, description, canonical, OpenGraph, Twitter, icons, dates	$0.01
`farm_links`	All links, absolutised, deduplicated, internal/external, per-host counts	$0.01
`farm_jsonld`	JSON-LD blocks parsed and indexed by schema.org type	$0.01
`farm_fingerprint`	Noise-normalised page fingerprint plus a changed/unchanged verdict	$0.015

Add it to a client

Claude Desktop — claude_desktop_config.json:

config.json

{
  "mcpServers": {
    "x402-money-farm": {
      "command": "npx",
      "args": ["-y", "x402-money-farm-mcp"],
      "env": {
        "X402_PRIVATE_KEY": "0xyour_funded_base_wallet_key",
        "X402_MAX_USD": "1.00"
      }
    }
  }
}

Claude Code:

Terminal

claude mcp add x402-money-farm \
  --env X402_PRIVATE_KEY=0x... \
  --env X402_MAX_USD=1.00 \
  -- npx -y x402-money-farm-mcp

Any other MCP client works the same way — it is a plain stdio server.

Try it before paying anything

Terminal

npx -y x402-money-farm-mcp

Then have the agent call farm_catalog. It reports the live prices, whether a wallet is configured and how much has been spent this session. Nothing is billed, and no wallet is needed to see it. If the prices do not suit you, you learned that for free.

Configuration

The server pays from your wallet, one call at a time. Gas is paid by the facilitator, so the wallet needs USDC on Base but no ETH.

Variable	Default	Meaning
`X402_PRIVATE_KEY`	—	Your funded Base wallet, `0x` + 64 hex characters. Without it the paid tools decline with an explanation and only `farm_catalog` works.
`X402_MAX_USD`	`1.00`	Hard spend cap for the process. Once reached, every further paid call is refused.
`FARM_BASE_URL`	`https://x402-money-farm.fly.dev`	The service to buy from.
`X402_NETWORK`	`eip155:8453`	Base mainnet.

Fund a wallet for this purpose with a few dollars — not your main one. The key sits in a config file on disk; treat it accordingly. The spend cap exists so a looping agent cannot drain even that wallet.

What a call costs, exactly

The price in the table is the whole price. No monthly minimum, no per-seat fee, no metered surprise. The server returns HTTP 402 with the exact amount, your wallet signs that amount, and you get the answer after settlement. A failed call is not billed. Every response carries a _payment block with the amount, the running session total and the paying address, so you can reconcile against the chain yourself.

Why pay-per-call at all

Because the alternative is a signup, a credit card, a minimum plan and a key to rotate — for an agent that wanted the metadata of four URLs. Here the agent decides on its own, pays four cents, and nobody had to create an account.

License

MIT.