How do I install Fastx402?

Fastx402 is a local plugin. Install it using npm package: fastx402-mcp and add the generated configuration snippet to your AI app's MCP config file. Then restart your AI app.

Is Fastx402 safe to use?

Yes. Fastx402 passed MCP Marketplace's automated security scan with a score of 10/10 (low risk). Every server on MCP Marketplace is security-scanned before it's listed; see the full security report on this page for the findings and permissions.

What credentials does Fastx402 need?

Fastx402 requires the following credentials or environment variables: FASTX402_EVM_PRIVATE_KEY, FASTX402_SOLANA_PRIVATE_KEY, FASTX402_MAX_USD_PER_CALL, FASTX402_MAX_USD_PER_DAY. You can find setup instructions on the server detail page.

What AI apps work with Fastx402?

Fastx402 uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Fastx402 MCP Server

by Tusk80

Developer ToolsLow Risk10.0MCP RegistryLocal

Free

Server data from the Official MCP Registry

60+ pay-per-call tools for agents (data, dates, QR, crypto, web), paid in USDC via x402.

About

60+ pay-per-call tools for agents (data, dates, QR, crypto, web), paid in USDC via x402.

Security Report

10.0

Low Risk10.0Low Risk

Valid MCP server (2 strong, 3 medium validity signals). No known CVEs in dependencies. Package registry verified. Imported from the Official MCP Registry.

3 files analyzed · 1 issue found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Required

This plugin requests these system permissions. Most are normal for its category.

file_system

Check that this permission is expected for this type of plugin.

HTTP Network Access

Connects to external APIs or services over the internet.

env_vars

Check that this permission is expected for this type of plugin.

What You'll Need

Set these up before or after installing:

Dedicated wallet key that pays in USDC on Base (0x + 64 hex)Required

Environment variable: FASTX402_EVM_PRIVATE_KEY

Dedicated wallet key that pays in USDC on Solana (base58)Required

Environment variable: FASTX402_SOLANA_PRIVATE_KEY

Maximum USD per single payment (default 0.05)Optional

Environment variable: FASTX402_MAX_USD_PER_CALL

Maximum USD spent per day (default 1)Optional

Environment variable: FASTX402_MAX_USD_PER_DAY

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-tusk80-fastx402": {
      "env": {
        "FASTX402_EVM_PRIVATE_KEY": "your-fastx402-evm-private-key-here",
        "FASTX402_MAX_USD_PER_DAY": "your-fastx402-max-usd-per-day-here",
        "FASTX402_MAX_USD_PER_CALL": "your-fastx402-max-usd-per-call-here",
        "FASTX402_SOLANA_PRIVATE_KEY": "your-fastx402-solana-private-key-here"
      },
      "args": [
        "-y",
        "fastx402-mcp"
      ],
      "command": "npx"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

fastx402-mcp

80+ small, fast tools for your AI agent, paid per call in USDC with x402. No account, no API key, no subscription: your agent pays a fraction of a cent per successful call, on Base or Solana.

Tools include background removal, image to SVG, image and video conversion, video to GIF, text to speech, QR codes, YAML/XML/CSV/JSON conversion, Markdown to HTML, text diffs, date math and formatting, cron descriptions, time zones, color conversion, unit conversion, IP and DNS lookups, email/IBAN/ISBN validation, hashing and JWT decoding, Ethereum/Base/Solana balances, token info, transaction status, gas prices, ENS and Basename resolution, web page text, screenshots, PDF text, OCR and audio transcription. The list is read live from fastx402.tools, so new tools appear without updating this package.

Quick start

Claude Desktop, one click: download fastx402.mcpb from the latest release, double-click it, and fill in the form (wallet key and limits). Done.

Any MCP client, by config:

Create a new, dedicated wallet and put a few dollars of USDC in it (on Base, or on Solana). Never use your main wallet.

Claude Desktop (claude_desktop_config.json), Cursor (~/.cursor/mcp.json) and most MCP clients:

{
  "mcpServers": {
    "fastx402": {
      "command": "npx",
      "args": ["-y", "fastx402-mcp"],
      "env": {
        "FASTX402_EVM_PRIVATE_KEY": "0xYOUR_DEDICATED_WALLET_KEY",
        "FASTX402_MAX_USD_PER_DAY": "1"
      }
    }
  }
}

For Solana, set FASTX402_SOLANA_PRIVATE_KEY (base58 secret key) instead of, or next to, the EVM key.

Settings

Variable	Default	What it does
`FASTX402_EVM_PRIVATE_KEY`	none	Wallet that pays in USDC on Base (0x + 64 hex)
`FASTX402_SOLANA_PRIVATE_KEY`	none	Wallet that pays in USDC on Solana (base58, 64-byte secret key)
`FASTX402_MAX_USD_PER_CALL`	`0.05`	Refuses any single payment above this, whatever the server asks
`FASTX402_MAX_USD_PER_DAY`	`1`	Stops paying once this much was spent today (kept in `~/.fastx402-mcp/spend.json`)
`FASTX402_URL`	`https://fastx402.tools`	The shop to use

Without a key the server still lists every tool, so you can look before you pay.

How paying works

The agent calls a tool; the server sends the request to fastx402.tools.
The shop answers 402 Payment Required with the exact price.
Your key signs a USDC authorization for that amount only, locally. The key never leaves your machine.
The request is repeated with the signature; the facilitator settles it on-chain (it also pays the network fee) and the answer comes back.

Failed calls (bad input 400, source down 502) are not charged. Prices are shown in every tool description.

Safety

Use a dedicated wallet with a small balance; the limits above are a second line of defence.
The key is only used to sign x402 USDC payments to fastx402.tools for the listed price.
Source: this single file, index.js. Read it.

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