💧 Spraay x402 MCP Server

Full-stack DeFi infrastructure for AI agents — 148 pay-per-call tools, backed by the 153-endpoint Spraay x402 Gateway on Base, with Solana, Ethereum, XRP, and Stellar payment rails.

Connect Claude, Cursor, or any MCP client to onchain payments, batch payouts, swaps, bridging, payroll, invoicing, escrow, oracle data, analytics, 200+ AI models, GPU/compute, research APIs, search/RAG, and more. Agents pay USDC per request via the x402 protocol — no API keys, no accounts.

The tool list is generated from the live gateway manifest at build time (npm run sync), so the authoritative catalog and pricing always live at the gateway — see Tool catalog. 24 of the gateway's endpoints are free (no payment required).

Quick Start

Two ways to connect, depending on how payments are authorized. Read Security & Wallet Safety before the local path — these tools can move real funds.

Option 1 — Remote URL (recommended, no private key on your machine)

Settlement is handled gateway-side; your client never holds a signing key.

Cursor (.cursor/mcp.json) or Claude Desktop (claude_desktop_config.json):

{
  "mcpServers": {
    "spraay": {
      "url": "https://spraay-x402-mcp--plagtech.run.tools"
    }
  }
}

Option 2 — Local, self-signed (advanced)

Run the server locally and let it sign USDC payments from a wallet you control. Use the scoped, version-pinned package.

{
  "mcpServers": {
    "spraay": {
      "command": "npx",
      "args": ["-y", "@plagtech/spraay-x402-mcp@4.0.0"],
      "env": {
        "EVM_PRIVATE_KEY": "${EVM_PRIVATE_KEY}",
        "SPRAAY_ENABLE_PAYMENTS": "true"
        // Optional autonomy leash — add these ONLY when running an
        // unsupervised agent. Leave them out for interactive/human use
        // (no limit). See Security & Wallet Safety below.
        // "SPRAAY_MAX_SPEND_USDC": "1.00",
        // "SPRAAY_DAILY_CAP_USDC": "10.00"
      }
    }
  }
}

Set EVM_PRIVATE_KEY in your shell environment — never paste a raw key into this file. Use a dedicated hot wallet funded only with what the agent may spend. See Security & Wallet Safety.

Smithery

smithery mcp add Plagtech/Spraay-x402-mcp

From source

git clone https://github.com/plagtech/spraay-x402-mcp
cd spraay-x402-mcp
npm install
cp .env.example .env          # then edit .env with your key (it is gitignored)
npm run build
npm start

Related MCP server: hyperd-mcp

Tool catalog

148 tools spanning the gateway's 27 categories. Highlights by area:

24 free endpoints require no payment — gas/prices/chain-status, address & batch validation, ENS resolution, unit conversion, x402 discovery probes, and model/compute discovery.

For the exact, current tool list and per-tool pricing, query the live manifest:

curl https://gateway.spraay.app/.well-known/x402.json

Pricing ranges from $0.001 (reads) to ~$0.10 (payroll, escrow release, tax), settled in USDC on Base.

How it works

1. An agent calls a tool (e.g. spraay_batch_execute).

2. The MCP server hits the Spraay x402 Gateway.

3. The gateway responds 402 Payment Required with a USDC amount.

4. Remote mode: settlement is handled gateway-side. Local mode: @x402/axios signs a USDC micropayment from your wallet, subject to the spend caps you set.

5. The gateway validates payment and returns the data.

Security & Wallet Safety

These tools can initiate real USDC payments. Treat the server like any tool with funds access.

• Prefer Option 1 (remote URL) — no signing key on your machine.

• If you self-sign (Option 2): use a dedicated hot wallet, funded only with what you'll let the agent spend. Never a key that controls other assets.

• Payments are off by default. SPRAAY_ENABLE_PAYMENTS must be true before any fund-moving tool will run. A fresh install cannot spend until you opt in. Read-only tools work regardless.

• Spend caps are optional — an autonomy leash for unattended agents. When you run an agent with no human watching, set SPRAAY_MAX_SPEND_USDC (per call) and SPRAAY_DAILY_CAP_USDC to bound the blast radius if it loops or is manipulated by upstream prompt injection. Leave them unset for interactive use — a human at the keyboard is the supervision, and there's no limit unless you add one.

• Never put a raw private key in a config file, issue, or any committed file. Keys live in a gitignored .env or your shell environment only.

The published npm package ships only dist/, README, and LICENSE (verify with npm pack --dry-run) — no binaries, no build tooling, no install scripts.

Report security issues to security@spraay.app, not a public issue.

Requirements

• Node.js 20+

• MCP client — Claude Desktop, Cursor, or any MCP-compatible client

• Wallet (local mode only) — an EVM key with USDC on Base; even $1 covers thousands of calls

Environment variables

Links

• MCP server: mcp.spraay.app

• Gateway: gateway.spraay.app

• Manifest: gateway.spraay.app/.well-known/x402.json

• Smithery: smithery.ai/servers/Plagtech/Spraay-x402-mcp

• x402: x402.org

License

MIT