x402engine
About
50+ pay-per-call APIs for AI agents via HTTP 402 crypto micropayments. $0.001–$0.12 per call with USDC and USDm.
Details
- Transport
- SSE
Explore
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
x402engineCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"x402engine": {
"server": {
"command": "npx",
"args": [
"-y",
"x402engine-mcp"
],
"env": {
"X402_BASE_URL": "",
"X402_DEV_BYPASS": "",
"X402_PAYMENT_HEADER": ""
}
}
}
}
}McpServers
{
"server": {
"command": "npx",
"args": [
"-y",
"x402engine-mcp"
],
"env": {
"X402_BASE_URL": "",
"X402_DEV_BYPASS": "",
"X402_PAYMENT_HEADER": ""
}
}
}Transport
"stdio"Package
"x402engine-mcp"Registry
"npm"- Discover available paid APIs— browse the live gateway catalog withdiscover_servicesto find LLM, image, crypto, travel, and other pay-per-request endpoints.
- Check service health before paying— useservice_healthto verify an endpoint is reachable and see its current pricing without spending.
- Generate images on demand— callgenerate_imageto create AI-generated images, with automatic USDC payment on Base or Solana.
- Execute code in a sandbox— run snippets viaexecute_codeand pay per execution through the x402 protocol.
- Fetch crypto prices and market data— queryget_crypto_price,get_crypto_markets, orget_trending_cryptofor real-time token and market information.
- Search flights and hotels— usesearch_flights,search_hotels, orsearch_locationsto look up travel options with per-request billing.
Agent-friendly MCP server forx402engine. 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.
Use a dedicated, low-balance payer wallet. The MCP signs x402 payments locally and never sends the private key to x402engine.
{ "mcpServers": { "x402engine": { "command": "npx", "args": ["-y", "[email protected]"], "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.
{ "mcpServers": { "x402engine": { "command": "npx", "args": ["-y", "[email protected]"], "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.
The server starts without a wallet, and free tools such asdiscover_servicesandservice_healthstill work. Paid tools return their x402 payment requirements until a wallet is configured.
claude mcp add x402engine -- npx -y [email protected]
Inautomode, 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.
Prices are included in each tool description and in live discovery. The gateway catalog can change independently of this package.
- 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
- Website:x402engine.app
- npm:x402engine-mcp
- GitHub:agentc22/x402engine-mcp
- Protocol:x402.org
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