X402engine MCP

Name: X402engine MCP
Author: agentc22

by agentc22version 1.0.3i★ 1iRuns on your computer

Registry nameio.github.agentc22/x402engine-mcp

How to install

What it does

50+ pay-per-call APIs for AI agents — images, LLM, code, crypto, travel & more via x402

Connects Runs on your computer
Account or key Needs X402_DEV_BYPASS, X402_PAYMENT_HEADER
Category Crypto & blockchain

Install

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

Passed 2/3 checks · Runs on your computer · ✓ Commands checked Nov 14, 2026

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

You need a X402engine MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a X402engine MCP key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

{
  "mcpServers": {
    "x402engine": {
      "command": "npx",
      "args": [
        "-y",
        "x402engine-mcp"
      ],
      "env": {
        "X402_DEV_BYPASS": "your-value",
        "X402_PAYMENT_HEADER": "your-value"
      }
    }
  }
}

Paste the key only into the app’s field, never into a chat or to anyone

Done

Quit Claude and open it again
Done
Try it
Use X402engine MCP and tell me what you can do for me, then show me one thing
✓ If Claude says it is using X402engine MCP or shows a X402engine MCP tool in the answer, you are connected

1 optional setting(s) (works without them)

The command above works without these. Add them only if you want to change something, following the maker’s description.

X402_BASE_URL Gateway URL (default: https://x402engine.app)

Descriptions are as written by the maker.

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect X402engine MCP yet

X402engine MCP runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect X402engine MCP

Steps for Claude →You need a X402engine MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →You need a X402engine MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)
Steps for Cursor →You need a X402engine MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)
Steps for VS Code →You need a X402engine MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

B · Others in Crypto & blockchain that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Solana MCP by Vybe✓ ChatGPT
0xinsider✓ ChatGPT
Highwire✓ ChatGPT

Works with Claude Code, with some setup first

You need a X402engine MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a X402engine MCP key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done
4
Paste this command and press Enter
```
claude mcp add --scope user x402engine --env X402_DEV_BYPASS=your-value --env X402_PAYMENT_HEADER=your-value -- npx -y x402engine-mcp
```
Replace “your-value” with your key before pressing Enter
Paste the key only into the app’s field, never into a chat or to anyone
Done
Type /mcp in Claude Code
You should see X402engine MCP listed as connected
Done
Try it
Use X402engine MCP and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using X402engine MCP or shows a X402engine MCP tool in the answer, you are connected

1 optional setting(s) (works without them)

The command above works without these. Add them only if you want to change something, following the maker’s description.

X402_BASE_URL Gateway URL (default: https://x402engine.app)

Descriptions are as written by the maker.

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

You need a X402engine MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a X402engine MCP key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Fill in your key
In the X402engine MCP settings, X402_DEV_BYPASS, X402_PAYMENT_HEADER is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use X402engine MCP and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using X402engine MCP or shows a X402engine MCP tool in the answer, you are connected

1 optional setting(s) (works without them)

The command above works without these. Add them only if you want to change something, following the maker’s description.

X402_BASE_URL Gateway URL (default: https://x402engine.app)

Descriptions are as written by the maker.

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

You need a X402engine MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a X402engine MCP key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Fill in your key
In the X402engine MCP settings, X402_DEV_BYPASS, X402_PAYMENT_HEADER is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use X402engine MCP and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using X402engine MCP or shows a X402engine MCP tool in the answer, you are connected

1 optional setting(s) (works without them)

The command above works without these. Add them only if you want to change something, following the maker’s description.

X402_BASE_URL Gateway URL (default: https://x402engine.app)

Descriptions are as written by the maker.

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use X402engine MCP💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

claude mcp add --scope user x402engine --env X402_DEV_BYPASS=your-value --env X402_PAYMENT_HEADER=your-value -- npx -y x402engine-mcp

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "x402engine": {
      "command": "npx",
      "args": [
        "-y",
        "x402engine-mcp"
      ],
      "env": {
        "X402_DEV_BYPASS": "your-value",
        "X402_PAYMENT_HEADER": "your-value"
      }
    }
  }
}

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "x402engine": {
      "command": "npx",
      "args": [
        "-y",
        "x402engine-mcp"
      ],
      "env": {
        "X402_DEV_BYPASS": "your-value",
        "X402_PAYMENT_HEADER": "your-value"
      }
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "x402engine": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "x402engine-mcp"
      ],
      "env": {
        "X402_DEV_BYPASS": "your-value",
        "X402_PAYMENT_HEADER": "your-value"
      }
    }
  }
}

Values you fill in

X402_BASE_URL env
Gateway URL (default: https://x402engine.app)
X402_DEV_BYPASS secret required env
Dev bypass secret to skip payments during testing
X402_PAYMENT_HEADER secret required env
Pre-signed x402 payment header for automatic payment

Descriptions are as written by the maker.

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

At a glance

GitHub stars i: 1
Downloads per weeki: 195/wk
Licence i: No licence stated
Connection: Runs on your computer
Transport: stdio
Latest versioni: 1.0.3
Categoryi: Crypto & blockchain
Published to registryi: Feb 11, 2026
Code last changedi: Oct 12, 2026
Maker: agentc22
Packages: npm: x402engine-mcp
Repo: agentc22/x402engine-mcp
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

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 14, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account agentc22, which owns the repo
✓ Pass
Still maintained
Code last changed 33 days ago
✕ Fail
Has a licence
No licence file found in the repo
– 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

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Crypto & blockchaini

More stars than 84% of the other 1691 servers in this category
Published to the registry more recently than 2% of the other 1691 servers in this category
Basic checks equal to or better than 51% of the other 1691 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 X402engine MCP safe?

It passed 2 of 3 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_DEV_BYPASS, X402_PAYMENT_HEADER

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 33 days ago, and the latest version (1.0.3) reached the registry 9 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: Solana MCP by Vybe, Oracle3 prediction-market arbitrage checks, Polymarket Paper Trader

Others in the same category

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

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

Solana MCP by Vybe

Solana MCP developer toolkit: wallets, trades, markets, PnL, transfers, onchain, swaps & API tools.

by vybenetworkGrowing★ 2.7K Stars for the whole repoUpdated 6 months ago

Runs in the cloud

How to connect

Oracle3 prediction-market arbitrage checks

Kalshi and Polymarket data, venue fees, no-arbitrage checks and paper execution for AI agents.

by YichengYang-EthanGrowing↓ 35/wk★ 569Updated 44 days ago

Runs on your computer

Install

Polymarket Paper Trader

Polymarket paper trading for AI agents: $10k paper money, real order books, official fees.

by agent-nextGrowing↓ 226/wk★ 507Updated 29 days ago

Runs on your computer

Install

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.

x402engine-mcp

Agent-friendly MCP server for x402engine. It lets agents discover and call pay-per-request APIs through HTTP 402, with automatic USDC payment on Base or Solana.

The live gateway covers LLMs, image and video generation, web search and scraping, code execution, crypto and wallet data, transaction simulation, audio, travel, and IPFS. This MCP exposes a curated tool set and live discovery for the full catalog.

Quick Start

Use a dedicated, low-balance payer wallet. The MCP signs x402 payments locally and never sends the private key to x402engine.

Base

"mcpServers": { "x402engine": { "command": "npx", "args": ["-y", "x402engine-mcp@1.1.1"], "env": { "X402_EVM_PRIVATE_KEY": "0xYOUR_DEDICATED_PAYER_KEY", "X402_PAYMENT_NETWORK": "base", "X402_MAX_PAYMENT_USD": "1.00" } } } }

Fund the wallet with USDC on Base. The x402 facilitator pays transaction gas; the wallet signs an EIP-3009 USDC authorization.

Solana

"mcpServers": { "x402engine": { "command": "npx", "args": ["-y", "x402engine-mcp@1.1.1"], "env": { "X402_SOLANA_PRIVATE_KEY": "YOUR_BASE58_OR_JSON_PRIVATE_KEY", "X402_PAYMENT_NETWORK": "solana", "X402_MAX_PAYMENT_USD": "1.00" } } } }

Fund the wallet with USDC on Solana and enough SOL for transaction fees.

Discovery Without a Wallet

The server starts without a wallet, and free tools such as discover_services and service_health still work. Paid tools return their x402 payment requirements until a wallet is configured.

claude mcp add x402engine -- npx -y x402engine-mcp@1.1.1

Hermes Agent

Install the x402engine skill and merge this server into the active Hermes profile's config.yaml:

mcp_servers:

x402engine: command: npx args: ["-y", "x402engine-mcp@1.1.1"] env: X402_BASE_URL: "https://x402engine.app" X402_PAYMENT_NETWORK: "auto" X402_MAX_PAYMENT_USD: "0.10"

Start a new session and call discover_services or service_health; both are free. Keep the network on auto until a wallet is configured. For Base payments, store X402_EVM_PRIVATE_KEY in the profile's local .env, add X402_EVM_PRIVATE_KEY: "${X402_EVM_PRIVATE_KEY}" to the server's env, and change the network to base. Never put wallet keys in chat. The cap applies per request; authorize a separate total budget for each task.

Full Hermes setup guide · Installable skill

Payment Controls

Variable	Default	Description
`X402_EVM_PRIVATE_KEY`	unset	Dedicated payer key for Base USDC
`X402_SOLANA_PRIVATE_KEY`	unset	Base58 or JSON payer key for Solana USDC
`X402_PAYMENT_NETWORK`	`auto`	`auto`, `base`, or `solana`
`X402_MAX_PAYMENT_USD`	`1.00`	Hard per-request spending limit
`X402_BASE_URL`	production gateway	Override the gateway URL
`X402_PAYMENT_HEADER`	unset	Legacy pre-signed x402 header
`X402_DEV_BYPASS`	unset	Development bypass secret

In auto mode, Base is preferred when both keys are configured. Automatic payment only accepts the canonical USDC contracts on Base and Solana. It rejects unknown assets, unsupported networks, and amounts above the configured cap before signing.

MegaETH remains available to clients that supply their own compatible payment header.

MCP Tools

Category	Tools
Discovery	`discover_services`, `service_health`
Image and code	`generate_image`, `execute_code`
Audio	`transcribe_audio`
Crypto	`get_crypto_price`, `get_crypto_markets`, `get_crypto_history`, `get_trending_crypto`, `search_crypto`, `get_crypto_categories`
Wallet and token	`get_wallet_balances`, `get_wallet_transactions`, `get_wallet_pnl`, `get_token_prices`, `get_token_metadata`
IPFS	`pin_to_ipfs`, `get_from_ipfs`
Travel	`search_flights`, `search_locations`, `search_hotels`, `search_cheapest_dates`

Prices are included in each tool description and in live discovery. The gateway catalog can change independently of this package.

Discovery

Gateway discovery: /.well-known/x402.json
Agent card: /.well-known/agent.json
Endpoint manifest: /.well-known/agent-manifest.v1.json
Services API: /api/services
Package metadata: server.json

Development

npm install

npm test npm run build

X402engine MCP

What it does

Install

Install Node.js

Sign up and create a X402engine MCP key

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install Node.js

Sign up and create a X402engine MCP key

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install Node.js

Sign up and create a X402engine MCP key

Click this button to open Cursor

Fill in your key

Open the AI chat in Cursor in Agent mode

Try it

Install Node.js

Sign up and create a X402engine MCP key

Click this button to open VS Code

Fill in your key

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

Values you fill in

At a glance

Which apps can use it

Related guides

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

Discussion

User reviews

Compared with others in Crypto & blockchaini

Common questions

Others in the same category

Solana MCP by Vybe

Oracle3 prediction-market arbitrage checks

Polymarket Paper Trader

README from the maker

x402engine-mcp

Quick Start

Base

Solana

Discovery Without a Wallet

Hermes Agent

Payment Controls

MCP Tools

Discovery

Development

Links