Spraay X402 MCP

Name: Spraay X402 MCP
Author: plagtech

by plagtechversion 3.1.1i★ –iRuns on your computer

Registry nameio.github.plagtech/spraay-x402-mcp

Install

Overview

Description from the maker (original English)

MCP server for Spraay x402 Gateway. 60 tools for crypto payments, DeFi, and AI on Base.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiVery new↓ 62/wk · ★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Crypto & blockchain
You need to fill in: X402_WALLET_PRIVATE_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: X402_WALLET_PRIVATE_KEY

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "spraay-x402": {
      "command": "npx",
      "args": [
        "-y",
        "spraay-x402-mcp"
      ],
      "env": {
        "X402_WALLET_PRIVATE_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add spraay-x402 --env X402_WALLET_PRIVATE_KEY=your-value -- npx -y spraay-x402-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "spraay-x402": {
      "command": "npx",
      "args": [
        "-y",
        "spraay-x402-mcp"
      ],
      "env": {
        "X402_WALLET_PRIVATE_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "spraay-x402": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "spraay-x402-mcp"
      ],
      "env": {
        "X402_WALLET_PRIVATE_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

X402_WALLET_PRIVATE_KEY secret required env
Private key for the wallet that pays for x402 requests (USDC on Base)

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 9, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account plagtech, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Crypto & blockchaini

More stars than 0% of the other 1619 servers in this category
Published to the registry more recently than 6% of the other 1619 servers in this category
Basic checks equal to or better than 100% of the other 1619 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Spraay X402 MCP safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: X402_WALLET_PRIVATE_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (3.1.1) reached the registry 8 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: CryptoCoinStat, lcas, LandedFX

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

💧 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).

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](#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

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.

How it works

An agent calls a tool (e.g. spraay_batch_execute).
The MCP server hits the Spraay x402 Gateway.
The gateway responds 402 Payment Required with a USDC amount.
Remote mode: settlement is handled gateway-side. Local mode: @x402/axios signs a USDC micropayment from the auto-created (or overridden) wallet.
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.

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.

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.

License

MIT

Spraay X402 MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Crypto & blockchaini

Common questions

Alternatives

CryptoCoinStat

lcas

LandedFX

README from the maker

💧 Spraay x402 MCP Server

Quick Start

One-line install (Claude Code)

Manual config (Cursor / Claude Desktop)

Optional — bring your own wallet

Remote URL (no wallet on your machine)

Smithery

From source

Tool catalog

How it works

Security & Wallet Safety

Requirements

Environment variables

Links

License