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Pay-per-call agent tools over x402 on Base: token/rug safety, DeFi signals, SEO, LLM. No keys.
About
Pay-per-call agent tools over x402 on Base: token/rug safety, DeFi signals, SEO, LLM. No keys.
Security Report
4.8
Use Caution4.8High RiskThis MCP server implements a secure x402 payment protocol for pay-per-call access to AI and web tools. The code demonstrates strong security practices around cryptographic key handling, wallet protection, and payment validation. The private key is never logged or exposed, and there are multiple layers of guards against malicious payment requirements (amount caps, asset/network pinning, secure URL enforcement). Some minor code quality concerns exist around exception handling breadth and input validation, but these do not materially impact security. Supply chain analysis found 5 known vulnerabilities in dependencies (2 critical, 3 high severity). Package verification found 1 issue.
8 files analyzed · 11 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Funded Base wallet private key for x402 payment signing (optional; without it, paid tools return the 402 requirements).Required
Environment variable: WALLET_PRIVATE_KEY
true402 API base (default https://true402.dev/api). Must be https (or localhost) — the signer refuses to send a payment over cleartext.
Environment variable: SERVER_URL
Client-side per-call spend ceiling in USDC (default 0.10). The signer refuses to auto-pay a 402 whose amount exceeds this — protects the wallet from a hostile endpoint.
Environment variable: MAX_PAYMENT_USDC
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"dev-true402-mcp-server": {
"env": {
"SERVER_URL": "your-server-url-here",
"MAX_PAYMENT_USDC": "your-max-payment-usdc-here",
"WALLET_PRIVATE_KEY": "your-wallet-private-key-here"
},
"args": [
"-y",
"@true402.dev/mcp-server"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
@true402.dev/mcp-server
MCP server for the true402 machine-native marketplace — give your agent pay-per-call access to AI inference and web tools over x402 (HTTP 402 micropayments in USDC on Base).
No accounts, no API keys. The agent's wallet is its identity: each paid tool returns an HTTP 402 challenge, the server signs an EIP-3009 USDC authorization, and the call settles on-chain. Configure a funded wallet to auto-pay, or run without one and the paid tools will surface the exact payment requirements instead of failing.
Tools
| Tool | Price | What it does |
|---|---|---|
chat | per-token + 3% | OpenAI-compatible LLM inference across many models |
list_models | free | List available models + pricing |
token_safety | $0.005 | ERC-20 rug/honeypot pre-check on Base → 0–100 score, risk band, flags, liquidity depth + a buy/sell honeypot simulation |
seo_audit | $0.015 | SEO + GEO (generative-engine-optimization) audit of a page → structured report |
web_extract | $0.005 | Fetch a URL → clean text + markdown + links + metadata |
link_preview | $0.003 | Fetch a URL → Open Graph / unfurl card |
robots_check | $0.003 | A site's AI-crawler policy (GPTBot, ClaudeBot, Google-Extended, PerplexityBot, …) + sitemaps + llms.txt |
headers_check | $0.003 | HTTP security-headers analysis (HSTS, CSP, …) + a 0–100 score |
new_pairs | $0.003 | Newly created Base DEX pairs (Uniswap V3 / Aerodrome) — fresh token launches |
liquidity_pulls | $0.003 | Liquidity-removal / rug alerts on Base pools |
whale_swaps | $0.005 | Large swaps on Base by USD size — whale flow |
token_report | $0.01 | Fuller on-chain token report |
Tools are auto-discovered from the live catalog, so new marketplace stalls appear automatically. Prices are illustrative; the live 402 challenge is authoritative.
Example: add token-safety to your agent
A copy-paste reference in examples/token-safety/ — a framework-agnostic
x402 client plus a drop-in LangChain tool that rug/honeypot-checks any Base token for $0.005/call.
Install
Requires Node.js ≥ 20. Runs over stdio — point any MCP client at it via npx.
Claude Desktop / Claude Code
Add to your MCP config (claude_desktop_config.json, or .mcp.json for Claude Code):
{
"mcpServers": {
"true402": {
"command": "npx",
"args": ["-y", "@true402.dev/mcp-server"],
"env": {
"WALLET_PRIVATE_KEY": "0xYOUR_FUNDED_BASE_WALLET_KEY"
}
}
}
}
Cursor / Cline / other MCP clients
Same idea — command npx, args ["-y", "@true402.dev/mcp-server"], and the WALLET_PRIVATE_KEY env var.
Configuration
| Env var | Default | Description |
|---|---|---|
SERVER_URL | https://true402.dev/api | true402 API base. Override to point at a self-hosted instance. |
WALLET_PRIVATE_KEY | (none) | A funded Base wallet private key used to sign x402 payments. Needs USDC (gas is sponsored by the facilitator — no ETH required). Without it, paid tools return the 402 requirements instead of paying. |
Security: the key is read only from the environment and is never logged, echoed, or returned. Use a dedicated low-balance wallet — fund it with only what you intend to spend.
How payment works
- The tool calls the true402 endpoint with no payment.
- The server replies
402with accepted payment options (USDC on Base). - This MCP server signs an EIP-3009
transferWithAuthorizationwith your wallet. - It retries with the signed
X-PAYMENTheader; the service verifies and responds. - Settlement happens on-chain. Your wallet pays only USDC — the facilitator sponsors gas.
Links
- Marketplace: https://true402.dev
- Live tool catalog: https://true402.dev/api/v1/services
- x402 protocol: https://x402.org
License
MIT
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