Server data from the Official MCP Registry
50+ pay-per-call APIs for AI agents — images, LLM, code, crypto, travel & more via x402
About
50+ pay-per-call APIs for AI agents — images, LLM, code, crypto, travel & more via x402
Security Report
Valid MCP server (1 strong, 1 medium validity signals). 3 known CVEs in dependencies (0 critical, 3 high severity) Package registry verified. Imported from the Official MCP Registry.
3 files analyzed · 4 issues 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.
What You'll Need
Set these up before or after installing:
Environment variable: X402_BASE_URL
Environment variable: X402_DEV_BYPASS
Environment variable: X402_PAYMENT_HEADER
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-agentc22-x402engine-mcp": {
"env": {
"X402_BASE_URL": "your-x402-base-url-here",
"X402_DEV_BYPASS": "your-x402-dev-bypass-here",
"X402_PAYMENT_HEADER": "your-x402-payment-header-here"
},
"args": [
"-y",
"x402engine-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
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@1.1.0"],
"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@1.1.0"],
"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@1.1.0
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
Links
- Website: x402engine.app
- npm: x402engine-mcp
- GitHub: agentc22/x402engine-mcp
- Protocol: x402.org
Reviews
No reviews yet
Be the first to review this server!
More Developer Tools MCP Servers
Git
Freeby Modelcontextprotocol · Developer Tools
Read, search, and manipulate Git repositories programmatically
Fetch
Freeby Modelcontextprotocol · Developer Tools
Web content fetching and conversion for efficient LLM usage
Toleno
Freeby Toleno · Developer Tools
Toleno Network MCP Server — Manage your Toleno mining account with Claude AI using natural language.
mcp-creator-python
Freeby mcp-marketplace · Developer Tools
Create, build, and publish Python MCP servers to PyPI — conversationally.
MCP Marketplace
Freeby mcp-marketplace · Developer Tools
Search and install MCP servers from inside your AI client.
MarkItDown
Freeby Microsoft · Content & Media
Convert files (PDF, Word, Excel, images, audio) to Markdown for LLM consumption