ToolSnap MCP

One connection, superpowers for your agent: deterministic microtools. Pay per call with USDC on Base — no account needed — or buy fiat credits with a card if you'd rather not touch crypto.

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

---

Why

ToolSnap is built around three ideas:

1. Deterministic — no LLM in the loop. Most agent stacks now "clean" web pages by paying a second model to summarize them. ToolSnap's extraction is pure parsing: exact quotes, stable output, zero added inference cost, reproducible runs. What you extract is what the page said.

2. Context-efficient by design. The biggest cost for AI agents isn't generation — it's context. Loading a raw webpage can burn 50,000+ tokens on HTML boilerplate; connecting a fat MCP server can burn as many in tool definitions. ToolSnap moves the work server-side and keeps discovery compact: tools/list shows a small curated core, and the full catalog of 38 microtools (web, PDFs, CSV/JSON, sitemaps, RSS, images…) sits one free tool_catalog() call away, executed via use_tool.

Benchmark (11 real pages, June 2026):

fetch_extract is free — this saving costs nothing.

3. No account required (crypto path). Free tools work the second you connect. Paid tools settle per call with USDC on Base via x402 — an agent with a wallet can pay cold: no signup, no subscription, no key management. Rather not touch crypto? Buy fiat credits with a card and get an API key instead — same discounted per-call price, no wallet needed.

---

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).

Paid tools — no wallet, pay with a card

Buy credits at mcp.toolsnap.app/checkout (handled by Polar, our Merchant of Record). You'll get an API key in a one-time pop-up — connect with it directly, no proxy needed:

{
  "mcpServers": {
    "toolsnap": {
      "url": "https://mcp.toolsnap.app/mcp",
      "headers": { "Authorization": "Bearer sk_live_..." }
    }
  }
}

Clients that can't send custom headers (some claude.ai connectors) can embed the key in the URL instead: https://mcp.toolsnap.app/mcp/sk_live_... (the key may then appear in that client's request logs — prefer the header when your client supports it).

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

38 tools total. tools/list shows a curated core (~18); discover everything else with the free tool_catalog tool and run it with use_tool(name, args).

Paid (x402) — real per-call COGS only

No first-call-free: these three tools have real per-call cost, so every call settles from the start. Pay-per-call is $0.03–$0.04 USDC on Base using x402 v2 (EIP-3009 transferWithAuthorization); prepaid (deposit once, debit off-chain, crypto or card) is cheaper per call.

Free (always)

Flagship: fetch_extract (URL → clean text, median 98.1% fewer tokens than raw HTML) and fetch_html (URL → clean structured HTML). Plus a wide utility catalog:

Call tool_catalog() for the complete, current list with schemas and prices.

---

Payment (x402)

When an agent calls a paid tool (e.g. screenshot_url) 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": "40000",
        "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: mechanism exists in code (KV key first_free:{address}) for future flat-rate tools; all current paid tools have real COGS and are excluded, so every call settles

---

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