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serp402

Official registry Search and web

Google search for agents: web, news, images, places, shopping, Scholar. Paid per call over x402.

Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package serp402-mcp
Claude Code 
claude mcp add serp402 -e 'SERP402_EVM_PRIVATE_KEY=<your serp402_evm_private_key>' -e 'SERP402_SOLANA_PRIVATE_KEY=<your serp402_solana_private_key>' -e 'SERP402_MAX_SPEND_USD=<SERP402_MAX_SPEND_USD>' -e 'SERP402_ENDPOINT=<SERP402_ENDPOINT>' -- npx -y serp402-mcp@1.0.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "serp402": {
            "command": "npx",
            "args": [
                "-y",
                "serp402-mcp@1.0.0"
            ],
            "env": {
                "SERP402_EVM_PRIVATE_KEY": "<your serp402_evm_private_key>",
                "SERP402_SOLANA_PRIVATE_KEY": "<your serp402_solana_private_key>",
                "SERP402_MAX_SPEND_USD": "<SERP402_MAX_SPEND_USD>",
                "SERP402_ENDPOINT": "<SERP402_ENDPOINT>"
            }
        }
    }
}

Environment variables

  • SERP402_EVM_PRIVATE_KEY secret 0x… key holding USDC on Base. Each search costs USD 0.005, charged to this wallet. Either this or the Solana key is required to search.
  • SERP402_SOLANA_PRIVATE_KEY secret ed25519 key (hex or base58) holding USDC on Solana. Alternative to the Base key.
  • SERP402_MAX_SPEND_USD Stop searching after this much has been spent in one session. Default 1.00.
  • SERP402_ENDPOINT Override the endpoint. Default https://serp402.com

Frequently asked questions

What is serp402?

Google search for agents: web, news, images, places, shopping, Scholar. Paid per call over x402.

How do I install serp402?

It runs on your machine. In Claude Code: claude mcp add serp402 -e 'SERP402_EVM_PRIVATE_KEY=<your serp402_evm_private_key>' -e 'SERP402_SOLANA_PRIVATE_KEY=<your serp402_solana_private_key>' -e 'SERP402_MAX_SPEND_USD=<SERP402_MAX_SPEND_USD>' -e 'SERP402_ENDPOINT=<SERP402_ENDPOINT>' -- npx -y serp402-mcp@1.0.0. For other clients, paste the JSON configuration from this page into their MCP settings.

Does serp402 need an API key?

Yes. It expects SERP402_EVM_PRIVATE_KEY, SERP402_SOLANA_PRIVATE_KEY, which you set in its configuration.

Who maintains serp402?

It is published by com.serp402. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.