Pay-per-call MCP tools (crypto/DeFi data, web reading, AI tasks) in USDC over x402 on Base.
Connect Runs on your machine
claude mcp add x402-seller-mcp -e BUYER_PRIVATE_KEY=<BUYER_PRIVATE_KEY> -e X402_ORIGIN=<X402_ORIGIN> -- npx -y [email protected]{
"mcpServers": {
"x402-seller-mcp": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"BUYER_PRIVATE_KEY": "<BUYER_PRIVATE_KEY>",
"X402_ORIGIN": "<X402_ORIGIN>"
}
}
}
}{
"mcpServers": {
"x402-seller-mcp": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"BUYER_PRIVATE_KEY": "<BUYER_PRIVATE_KEY>",
"X402_ORIGIN": "<X402_ORIGIN>"
}
}
}
}{
"servers": {
"x402-seller-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"BUYER_PRIVATE_KEY": "<BUYER_PRIVATE_KEY>",
"X402_ORIGIN": "<X402_ORIGIN>"
}
}
}
}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 |
|---|---|
BUYER_PRIVATE_KEYOptional, secret | EVM private key (0x...) of a throwaway wallet funded with a small amount of USDC on Base. Leave unset for explain-only mode (tool calls describe the 402 payment challenge instead of paying). |
X402_ORIGINOptional | Which x402-compatible server to expose as MCP tools. |
Details
| Package | [email protected] (NPM, stdio) |
| First published | 2 Sep 2026 |
| Last updated | 2 Sep 2026 |
| Registry name | io.github.entreprisedaney33-rgb/x402-seller-mcp |
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