ToolSnap MCP

Context-efficient microtools for AI agents. Pay per call with USDC on Base.

Live endpoint: https://mcp.toolsnap.app/mcp
Server card: /.well-known/mcp.json
Pricing: /.well-known/pricing.json
Docs: toolsnap.app/agents

Why

The biggest cost for AI agents isn't generation — it's context. When an agent loads a raw webpage to extract information it can burn 50,000+ tokens on HTML boilerplate. ToolSnap MCP moves that work server-side.

Benchmark (11 real pages, June 2026):

The tool costs $0.02 USDC → 7.8× ROI on a typical page.

Related MCP server: webpeel

Connect

Claude Desktop

{
  "mcpServers": {
    "toolsnap": {
      "url": "https://mcp.toolsnap.app/mcp",
      "transport": "streamable-http"
    }
  }
}

Free tools work immediately with the URL connection above. Paid tools need an x402 payment client — a wallet alone is not enough, because most MCP clients can't satisfy a 402 Payment Required on their own. Use the pay-proxy below.

Paid tools — connect through the pay-proxy

scripts/pay-proxy.mjs is a local stdio MCP server that wraps the remote endpoint, reads your wallet, and signs + retries automatically when the server asks for payment. The private key never leaves your host; only signatures are sent.

{
  "mcpServers": {
    "toolsnap": {
      "command": "node",
      "args": ["/ABSOLUTE/PATH/to/toolsnap-mcp/scripts/pay-proxy.mjs"]
    }
  }
}

No wallet yet? Call the wallet_setup tool — it generates a wallet you control, helps your human fund it with USDC on Base, and wires this proxy. Key resolution order: TOOLSNAP_WALLET_KEY → ~/.toolsnap/wallet.key → macOS Keychain (toolsnap-agent-wallet/default).

Useful env: TOOLSNAP_MAX_PRICE_USDC (per-call spend cap, default 0.10), TOOLSNAP_PREPAID=1 + TOOLSNAP_AUTO_DEPOSIT_USDC (use the cheaper prepaid balance).

Direct MCP call

curl -X POST https://mcp.toolsnap.app/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Tools

Paid (x402)

First call free per wallet address. After that, your agent pays $0.02 USDC on Base using x402 v2 (EIP-3009 transferWithAuthorization). No API key, no subscription — pay only when you call.

Free (always)

Payment (x402)

When an agent calls fetch_extract without payment, the server returns:

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": 402,
    "message": "Payment required",
    "data": {
      "x402Version": 2,
      "accepts": [{
        "scheme": "exact",
        "network": "eip155:8453",
        "amount": "20000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
      }]
    }
  }
}

An x402-enabled client reads accepts[0], signs an EIP-3009 TransferWithAuthorization, and retries with _meta["x402/payment"] set. See x402 spec.

Run locally

npm install
cp .dev.vars.example .dev.vars  # fill in wallet secrets
npm run dev
# Worker at http://localhost:8787

Type-check

npm run typecheck

Deploy

npm run deploy

Stack

• Runtime: Cloudflare Workers (edge, 0 ms cold start)

• Protocol: MCP streamable-http (JSON-RPC 2.0)

• Payment: x402 v2 · EIP-3009 on Base mainnet · USDC

• Verification: off-chain EIP-712 signature recovery (viem)

• Settlement: on-chain transferWithAuthorization via relayer wallet

• Anti-replay: Cloudflare KV nonce store (7-day TTL)

• First-call-free: KV key first_free:{address}, verified but not settled

Contributing

PRs welcome for new free tools in src/tools/. Follow the pattern in src/tools/text-stats.ts and add the tool to src/tools/index.ts.

For paid tools or changes to the x402 payment logic, open an issue first.

Do not commit wallet private keys, .dev.vars, or any secrets.

License

MIT