Stdio MCP proxy: free probe, then x402-paid ReadFetch tools; for hosts that cannot sign x402.
Connect Runs on your machine
claude mcp add mcp-x402-proxy -e EVM_PRIVATE_KEY=<EVM_PRIVATE_KEY> -e READFETCH_MAX_PAYMENT_USD=<READFETCH_MAX_PAYMENT_USD> -e READFETCH_MCP_URL=<READFETCH_MCP_URL> -e READFETCH_DEV=<READFETCH_DEV> -- npx -y @readfetch/[email protected]{
"mcpServers": {
"mcp-x402-proxy": {
"command": "npx",
"args": [
"-y",
"@readfetch/[email protected]"
],
"env": {
"EVM_PRIVATE_KEY": "<EVM_PRIVATE_KEY>",
"READFETCH_MAX_PAYMENT_USD": "<READFETCH_MAX_PAYMENT_USD>",
"READFETCH_MCP_URL": "<READFETCH_MCP_URL>",
"READFETCH_DEV": "<READFETCH_DEV>"
}
}
}
}{
"mcpServers": {
"mcp-x402-proxy": {
"command": "npx",
"args": [
"-y",
"@readfetch/[email protected]"
],
"env": {
"EVM_PRIVATE_KEY": "<EVM_PRIVATE_KEY>",
"READFETCH_MAX_PAYMENT_USD": "<READFETCH_MAX_PAYMENT_USD>",
"READFETCH_MCP_URL": "<READFETCH_MCP_URL>",
"READFETCH_DEV": "<READFETCH_DEV>"
}
}
}
}{
"servers": {
"mcp-x402-proxy": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@readfetch/[email protected]"
],
"env": {
"EVM_PRIVATE_KEY": "<EVM_PRIVATE_KEY>",
"READFETCH_MAX_PAYMENT_USD": "<READFETCH_MAX_PAYMENT_USD>",
"READFETCH_MCP_URL": "<READFETCH_MCP_URL>",
"READFETCH_DEV": "<READFETCH_DEV>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
EVM_PRIVATE_KEYOptional, secret | Base mainnet wallet for paid tools; omit for readfetch_probe and tools/list only |
READFETCH_MAX_PAYMENT_USDOptional | Maximum USD per x402 authorization (default 1, max 100) |
READFETCH_MCP_URLOptional | Upstream MCP URL for tools/list (default https://readfetch.com/mcp) |
READFETCH_DEVOptional | Set to 1 for localhost/Sepolia dev only; never with production READFETCH_MCP_URL |
Details
| Package | @readfetch/[email protected] (NPM, stdio) |
| First published | 6 Nov 2026 |
| Last updated | 6 Nov 2026 |
| Registry name | io.github.readfetch/mcp-x402-proxy |
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