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MCP Server

by true402

Pay-per-call AI, web, finance, and blockchain analysis tools using USDC micropayments on Base.

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Install MCP Server

Pick your client, then add it in one click or paste the config.

STDIONode.js
~/Library/Application Support/Claude/claude_desktop_config.json
claude_desktop_config.json
{
  "mcpServers": {
    "true402-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@true402.dev/mcp-server"
      ],
      "env": {
        "WALLET_PRIVATE_KEY": "YOUR_VALUE_HERE",
        "SERVER_URL": "YOUR_VALUE_HERE",
        "MAX_PAYMENT_USDC": "YOUR_VALUE_HERE"
      }
    }
  }
}

Settings → Developer → Edit Config, merge this into mcpServers, then fully quit and reopen Claude Desktop.

Values are written into the snippet above so you can paste it as is. They never leave your browser.

Automated check passed— started and listed 33 tools correctly (27d ago).

Overview

The true402/mcp-server MCP server exposes pay-per-call AI, web, finance, SEO, and blockchain analysis tools through MCP. It discovers tools from the live true402 catalog and uses x402 payments: a funded Base wallet signs an exact USDC authorization when a tool returns an HTTP 402 challenge. Paid calls require WALLET_PRIVATE_KEY, while the server can run without a wallet to show payment requirements; some operations also provide limited daily free trials. Reach for it when an agent needs token safety checks, web extraction, market data, LLM inference, or transaction preflight without managing provider accounts or API keys.

Use cases

  • Inspect Base tokens for honeypot and rug indicators before trading
  • Extract web pages and audit their SEO, crawler policies, and headers
  • Compare live LLM models and pay per inference request
  • Check unsigned Base transactions before signing approvals or calls
  • Rank DeFi pools and search prediction markets

Key features

  • x402 USDC payments on Base
  • Live tool and model catalog discovery
  • Token, address, deployer, and transaction safety checks
  • Web extraction, SEO, and security analysis
  • LLM inference with live per-token pricing
  • Finance, DeFi, and prediction-market data

Tools33

What MCP Server lets your agent do. Expand a tool for its parameters.

Verified live~7.9k tokens of context

Security & health

What it can reach and how reliably it runs — from our own checks, not the maintainer’s claims.

ActiveLast checked Today

Recent health check succeeded.

6/7 checks healthy over the last 78d

Supply-chain signal

No high-severity advisories surfaced by our automated scan.

Critical 0High 0Medium 0Low 0

Scanned 7d ago via OSV.dev · @true402.dev/mcp-server (npm)

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

npm downloads1kPackage downloads in the last 30 days.
Last commit2d agoMost recent push to the default branch.
Availability100%Our rolling endpoint + install checks that succeeded.
Install checkPassedOur sandbox started it and listed its tools.
Tools exposed33Callable tools this server registers over MCP.
Directory activity4 viewsConfig copies, upvotes, and views on AllMCPs.

How MCP Server works

What true402/mcp-server MCP server does

The true402/mcp-server MCP server connects MCP clients to the true402 machine-native marketplace. It exposes tools for LLM inference, web and SEO analysis, deterministic finance calculations, prediction markets, DeFi yields, and blockchain safety checks. The catalog includes both free discovery functions and paid operations whose prices are returned through x402 payment challenges.

Blockchain coverage includes Base, Ethereum, and selected BNB Smart Chain token checks. Depending on the tool, an agent can inspect ERC-20 behavior, liquidity, ownership, mint capability, honeypot behavior, deployer reputation, liquidity removals, whale swaps, or the safety of an unsigned transaction. Web tools can extract page text, preview links, render screenshots, inspect robots and llms policies, and score HTTP security headers.

How it works

The true402/mcp-server MCP server sends a tool request to the true402 API. For a paid operation, the API returns HTTP 402 with the exact payment terms. When a wallet is configured, the server signs an EIP-3009 USDC authorization on Base, retries with the payment header, and settlement occurs on-chain. The facilitator sponsors gas, so the configured wallet needs USDC but does not need ETH for gas.

Each authorization buys one response. Payment is submitted only after a successful 2xx response, and calls that error or time out are not settled. The server enforces MAX_PAYMENT_USDC as a per-call ceiling; requests above that limit are refused before payment. Tool prices can change, and the live 402 response is authoritative.

Setup and configuration

The package runs over stdio and requires Node.js 20 or newer. A typical MCP client configuration uses npx -y @true402.dev/mcp-server. Claude Desktop, Claude Code, Cursor, Cline, and other MCP clients can use the same command pattern.

Environment settings include:

  • WALLET_PRIVATE_KEY: a funded Base wallet key for automatic x402 payments. The key is read from the environment and is not logged or returned.
  • SERVER_URL: API base URL, defaulting to https://true402.dev/api; it can point to a self-hosted instance.
  • MAX_PAYMENT_USDC: maximum amount allowed for one call, defaulting to 0.25.

A wallet is not needed to start the process. Without one, paid tools return their payment requirements rather than completing the payment. The documentation recommends using a dedicated, low-balance wallet.

Tools and capabilities

The true402/mcp-server MCP server includes list_models for live model IDs and token prices, and chat for paid LLM completions across several providers. Other capabilities include:

  • SEO/GEO audits, keyword volume and ideas, ranked keywords, and backlink reports.
  • Web extraction, Open Graph link previews, screenshots, robots and llms checks, and security-header analysis.
  • Black-Scholes, volatility, Sharpe, Sortino, Kelly, drawdown, VaR, CVaR, and CAGR calculations.
  • Prediction-market search and DeFi pool filtering with APY, TVL, stablecoin, and risk fields.
  • Token reports, address and deployer checks, new-pair discovery, liquidity alerts and history, whale swaps, and unsigned transaction preflight.

Tools are auto-discovered from the live catalog, so the available set may change without a package update.

Limitations and notes

Most operations are paid in USDC on Base, although some have a small per-IP daily free allowance. list_models is free. seo_audit is priced per page and can exceed a normal per-call ceiling when auditing multiple pages, so the ceiling may need adjustment. deployer_check requires an explorer key on the service side and can return 503 when that configuration is absent.

On-chain safety results are assessments, not guarantees. For example, tx_preflight checks simulation, decoded intent, and archived counterparty liquidity activity but never labels a transaction safe. Historical liquidity coverage is limited to the indexed block range, and a clean result means only that the reported checks found no issue.

Read the full README View source on GitHub

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Frequently Asked Questions about MCP Server

Use Node.js 20 or newer and run `npx -y @true402.dev/mcp-server`, or configure that command in an MCP client.

Yes. The README provides Claude Desktop and Claude Code configuration using the npx command and optional WALLET_PRIVATE_KEY.

No provider API key is required for the marketplace payment flow. Paid calls use a funded Base wallet, and the wallet private key is supplied through WALLET_PRIVATE_KEY.

It handles an HTTP 402 challenge, signs an EIP-3009 USDC authorization with the configured wallet, and retries the request. The facilitator sponsors gas.

Yes. It can run without WALLET_PRIVATE_KEY, but paid tools return payment requirements instead of paying. Some operations offer limited daily free calls.

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