Budget-capped x402 buyer: delegate USDC in plain words, agent discovers and pays per call.
Connect Runs on your machine
claude mcp add 402-lab -e BUYER_PRIVATE_KEY=<BUYER_PRIVATE_KEY> -e NETWORK=<NETWORK> -e MANDATE_MAX_USDC=<MANDATE_MAX_USDC> -e CATALOG_URLS=<CATALOG_URLS> -- https://github.com/Kairose-master/handsel-mandate/releases/download/mcp-v0.1.0/402-lab.mcpb{
"mcpServers": {
"402-lab": {
"command": "https://github.com/Kairose-master/handsel-mandate/releases/download/mcp-v0.1.0/402-lab.mcpb",
"args": [],
"env": {
"BUYER_PRIVATE_KEY": "<BUYER_PRIVATE_KEY>",
"NETWORK": "<NETWORK>",
"MANDATE_MAX_USDC": "<MANDATE_MAX_USDC>",
"CATALOG_URLS": "<CATALOG_URLS>"
}
}
}
}{
"mcpServers": {
"402-lab": {
"command": "https://github.com/Kairose-master/handsel-mandate/releases/download/mcp-v0.1.0/402-lab.mcpb",
"args": [],
"env": {
"BUYER_PRIVATE_KEY": "<BUYER_PRIVATE_KEY>",
"NETWORK": "<NETWORK>",
"MANDATE_MAX_USDC": "<MANDATE_MAX_USDC>",
"CATALOG_URLS": "<CATALOG_URLS>"
}
}
}
}{
"servers": {
"402-lab": {
"type": "stdio",
"command": "https://github.com/Kairose-master/handsel-mandate/releases/download/mcp-v0.1.0/402-lab.mcpb",
"args": [],
"env": {
"BUYER_PRIVATE_KEY": "<BUYER_PRIVATE_KEY>",
"NETWORK": "<NETWORK>",
"MANDATE_MAX_USDC": "<MANDATE_MAX_USDC>",
"CATALOG_URLS": "<CATALOG_URLS>"
}
}
}
}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_KEYRequired, secret | 0x-prefixed private key of the paying wallet (keep only small amounts) |
NETWORKOptional | eip155:84532 (Base Sepolia, default) or eip155:8453 (Base mainnet) |
MANDATE_MAX_USDCOptional | Absolute cap any mandate may reach |
CATALOG_URLSOptional | Comma-separated seller product.json URLs searched besides the x402 Bazaar |
Details
| Package | https://github.com/Kairose-master/handsel-mandate/releases/download/mcp-v0.1.0/[email protected] (MCPB, stdio) |
| First published | 25 Sep 2026 |
| Last updated | 25 Sep 2026 |
| Registry name | io.github.Kairose-master/402-lab |
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