Fastx402

Name: Fastx402
Author: tusk80

by tusk80version 0.1.1i★ –iRuns on your computer

Registry nameio.github.tusk80/fastx402

Install

Overview

Description from the maker (original English)

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

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
UsageiNot measured yet★ –

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: FASTX402_EVM_PRIVATE_KEY, FASTX402_SOLANA_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: FASTX402_EVM_PRIVATE_KEY, FASTX402_SOLANA_PRIVATE_KEY, FASTX402_MAX_USD_PER_CALL, FASTX402_MAX_USD_PER_DAY

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": {
    "fastx402": {
      "command": "npx",
      "args": [
        "-y",
        "fastx402-mcp"
      ],
      "env": {
        "FASTX402_EVM_PRIVATE_KEY": "your-value",
        "FASTX402_SOLANA_PRIVATE_KEY": "your-value",
        "FASTX402_MAX_USD_PER_CALL": "your-value",
        "FASTX402_MAX_USD_PER_DAY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add fastx402 --env FASTX402_EVM_PRIVATE_KEY=your-value --env FASTX402_SOLANA_PRIVATE_KEY=your-value --env FASTX402_MAX_USD_PER_CALL=your-value --env FASTX402_MAX_USD_PER_DAY=your-value -- npx -y fastx402-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": {
    "fastx402": {
      "command": "npx",
      "args": [
        "-y",
        "fastx402-mcp"
      ],
      "env": {
        "FASTX402_EVM_PRIVATE_KEY": "your-value",
        "FASTX402_SOLANA_PRIVATE_KEY": "your-value",
        "FASTX402_MAX_USD_PER_CALL": "your-value",
        "FASTX402_MAX_USD_PER_DAY": "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": {
    "fastx402": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "fastx402-mcp"
      ],
      "env": {
        "FASTX402_EVM_PRIVATE_KEY": "your-value",
        "FASTX402_SOLANA_PRIVATE_KEY": "your-value",
        "FASTX402_MAX_USD_PER_CALL": "your-value",
        "FASTX402_MAX_USD_PER_DAY": "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

FASTX402_EVM_PRIVATE_KEY secret env
Dedicated wallet key that pays in USDC on Base (0x + 64 hex)
FASTX402_SOLANA_PRIVATE_KEY secret env
Dedicated wallet key that pays in USDC on Solana (base58)
FASTX402_MAX_USD_PER_CALL env
Maximum USD per single payment (default 0.05)
FASTX402_MAX_USD_PER_DAY env
Maximum USD spent per day (default 1)

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 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account tusk80, 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 1611 servers in this category
Published to the registry more recently than 70% of the other 1611 servers in this category
Basic checks equal to or better than 100% of the other 1611 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 Fastx402 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: FASTX402_EVM_PRIVATE_KEY, FASTX402_SOLANA_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 (0.1.1) reached the registry 21 days 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: Bellchain, Quidli Connect, Diamond Bitcoin Intelligence

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Runs on your computerUpdated today

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Quidli Connect

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Computer or cloudUpdated today

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Diamond Bitcoin Intelligence

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Runs in the cloudUpdated today

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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.

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.

Fastx402

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

Bellchain

Quidli Connect

Diamond Bitcoin Intelligence

README from the maker

fastx402-mcp

Quick start

Settings

How paying works

Safety

Links