💧 Spraay x402 MCP Server

Full-stack DeFi infrastructure for AI agents — 183 pay-per-call tools, backed by the 192-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).

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Quick Start

Install and go — no config, no API keys, no env vars. On first run the server auto-creates a wallet, saves it to ~/.spraay/.session, and prints the address to stderr. Fund that address with USDC on Base and start calling tools.

Read Security & Wallet Safety — these tools move real funds.

One-line install (Claude Code)

claude mcp add spraay -s user -- npx -y spraay-x402-mcp

Manual config (Cursor / Claude Desktop)

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

{
  "mcpServers": {
    "spraay": {
      "command": "npx",
      "args": ["-y", "spraay-x402-mcp"]
    }
  }
}

That's it. The first run prints something like:

💧 Spraay created a new wallet: 0xABC…123
   Private key saved to ~/.spraay/.session (keep it safe — it controls funds).
   Fund this address with USDC on Base to start paying for tool calls.

Optional — bring your own wallet

To sign with a key you already control instead of the auto-created one, set EVM_PRIVATE_KEY in your environment (it overrides the session wallet). Never paste a raw key into a committed config file — use a dedicated hot wallet funded only with what the agent may spend. See Security & Wallet Safety.

Remote URL (no wallet on your machine)

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

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

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
npm run build
npm start                     # auto-creates a wallet on first run

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Tool catalog

183 tools spanning the gateway's 33 categories. Highlights by area:

Area	What it covers
AI & Inference	200+ LLMs (OpenAI-compatible), wallet/tx classification, contract explanation, summaries
Compute	Text / image / video / TTS / STT / embeddings across Replicate, Chutes, OpenRouter; batch jobs
Compute Futures	Prepaid compute credits with tier discounts; draw down per inference
Bittensor	Decentralized inference, image gen, and embeddings via SN64 / SN19
Payments	Batch payouts up to 200 recipients (Base, XRP Ledger, Stellar); estimates
Payroll	Stablecoin payroll runs across Base, Ethereum, Solana
Invoicing & Escrow	Crypto-native invoices and milestone escrow (persistent)
DeFi & Data	Swaps (Uniswap V3 / Aerodrome), oracle prices/gas/FX, bridge quotes, balances, ENS/Basename
Analytics	Wallet profiles and decoded transaction history
Research	250M+ papers (OpenAlex), arXiv, Crossref, PubMed, PubChem, US Census, dictionary
Search & RAG	Web search, content extraction, question answering
Communication	Email, SMS, XMTP messaging, webhooks
Infrastructure	Multi-chain RPC, IPFS/Arweave storage, cron scheduling, structured logs
Identity & Compliance	KYC/sanctions screening, auth sessions, audit trail, crypto tax (FIFO, IRS 8949)
Supply Chain (SCTP)	Supplier registration, purchase orders, invoice verification, settlement
Robotics (RTP)	Register robots, dispatch paid tasks, escrow-backed completion
Trust & Safety	ProofLayer trust scores; free token-safety, address-safety, and tx-decode checks

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.

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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 the auto-created (or overridden) wallet.
5. The gateway validates payment and returns the data.

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Security & Wallet Safety

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

• The auto-created wallet only holds what you send it. Fund it with only as much USDC as you're willing to let the agent spend. It starts empty, so a fresh install cannot move funds until you fund it; read-only tools work regardless.
• The session key lives at ~/.spraay/.session. Protect that file like any secret — anyone who reads it controls the wallet. It's written with 0600 permissions on POSIX systems. Back it up if the funds matter; delete it to rotate to a new wallet on the next run.
• Prefer the remote URL if you'd rather keep no signing key on your machine — settlement is handled gateway-side.
• If you bring your own key via EVM_PRIVATE_KEY, use a dedicated hot wallet that controls no other assets, and never put a raw private key in a config file, issue, or any committed file — keep it in 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.

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Requirements

• Node.js 20+
• MCP client — Claude Desktop, Cursor, or any MCP-compatible client
• USDC on Base — fund the auto-created wallet (or your own); even $1 covers thousands of calls

Environment variables

None are required — the server runs with zero configuration. All of the following are optional overrides.

Variable	Required	Default	Description
EVM_PRIVATE_KEY	No	auto-created at ~/.spraay/.session	Override the auto-created wallet with your own key. Use a dedicated, funded-as-needed hot wallet.
SPRAAY_GATEWAY_URL	No	https://gateway.spraay.app	Override the gateway URL.

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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