Assay Oracle MCP Server

by jasonczmengio.github.JasonCZMeng/assayv0.2.0

MCP server for Assay, the x402 service-quality oracle — check any machine-payable service's quality tier and score (earned by real paid probes with on-chain receipts) before your agent pays it.

0Node.jsstdioofficial registry

context tax

queued

security

queued

cold start

queued

freshness

Maintained2mo ago

Install Assay Oracle MCP server

claude mcp add assay-oracle -e ASSAY_WALLET_KEY='<assay-wallet-key>' -- npx -y assay-oracle-mcp

{
  "mcpServers": {
    "assay-oracle": {
      "command": "npx",
      "args": [
        "-y",
        "assay-oracle-mcp"
      ],
      "env": {
        "ASSAY_WALLET_KEY": "<assay-wallet-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "assay-oracle": {
      "command": "npx",
      "args": [
        "-y",
        "assay-oracle-mcp"
      ],
      "env": {
        "ASSAY_WALLET_KEY": "<assay-wallet-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "assay-oracle": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "assay-oracle-mcp"
      ],
      "env": {
        "ASSAY_WALLET_KEY": "<assay-wallet-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "assay-oracle": {
      "command": "npx",
      "args": [
        "-y",
        "assay-oracle-mcp"
      ],
      "env": {
        "ASSAY_WALLET_KEY": "<assay-wallet-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
ASSAY_URL	—	—	Assay instance to query (default: https://assay.nominal-labs.com)
ASSAY_WALLET_KEY	—	yes	Optional Base wallet private key; when set, get_score auto-purchases full reports ($0.005, hard-capped 0.01 USDC/call)

Freshness

Maintained — last maintenance signal 2mo ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-08-08 · 2mo ago · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-08-05 · 2mo ago · official registry · v0.2.0

FAQ

›How do I install the Assay Oracle MCP server in Claude Code?

Run: claude mcp add assay-oracle -e ASSAY_WALLET_KEY='<assay-wallet-key>' -- npx -y assay-oracle-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Assay Oracle require an API key?

Yes. It expects ASSAY_WALLET_KEY, of which 1 is a secret.

›Can I use Assay Oracle as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Assay Oracle in the official MCP registry?

Yes, as io.github.JasonCZMeng/assay.