x402engine

- 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.

{ "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.

{ "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.

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 x402engine-mcp@1.1.0

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

A set of tools for interacting with the Flow blockchain through the Model Context Protocol.