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Trust & reliability scores for x402 endpoints: free ecosystem stats, paid per-endpoint scores.
About
Trust & reliability scores for x402 endpoints: free ecosystem stats, paid per-endpoint scores.
Security Report
5.2
Moderate5.2Moderate RiskWell-structured MCP server with proper authentication for paid operations and appropriate permission scoping. The server uses environment variables for sensitive credentials, implements payment authorization via EIP-3009 signatures (not storing keys), and has clear separation between free and paid endpoints. Minor code quality improvements around error handling and input validation, but no security vulnerabilities. Supply chain analysis found 2 known vulnerabilities in dependencies (2 critical, 0 high severity). Package verification found 1 issue.
5 files analyzed · 8 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:
Optional Base wallet private key (0x...). When set, the paid tools auto-pay over x402 up to X402_MAX_USD; otherwise they return a price quote. The free tools need no key.Required
Environment variable: X402_PRIVATE_KEY
Per-call auto-pay ceiling in USD.
Environment variable: X402_MAX_USD
API base URL.
Environment variable: X402_TRUST_API_BASE
Request timeout in milliseconds.
Environment variable: X402_TIMEOUT_MS
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-jonasfuchss-x402-trust-mcp": {
"env": {
"X402_MAX_USD": "your-x402-max-usd-here",
"X402_TIMEOUT_MS": "your-x402-timeout-ms-here",
"X402_PRIVATE_KEY": "your-x402-private-key-here",
"X402_TRUST_API_BASE": "your-x402-trust-api-base-here"
},
"args": [
"-y",
"x402-trust-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
x402-trust-mcp
An MCP server that lets your agent check the trust & reliability of x402 endpoints before paying them.
Backed by x402.fuchss.app, which monitors the entire x402 ecosystem on Base 24/7: uptime probes, 402-envelope spec compliance, advertised-price history, and real on-chain USDC settlement volume per endpoint.
Why
Agents increasingly pay x402 endpoints autonomously. But ~⅔ of listed x402 endpoints are unreachable and ~⅓ of the reachable ones serve non-compliant payment envelopes. Before your agent sends USDC to an unknown endpoint, ask: is it alive, compliant, and does anyone actually pay it?
Tools
| Tool | Cost | Description |
|---|---|---|
x402_ecosystem_stats | free | Aggregate state of the x402 ecosystem (listings, reachability, compliance, 30d settlement volume). |
x402_trust_leaderboard | free | Top-25 most trustworthy x402 endpoints. |
x402_trust_score | paid | Trust score (0-100, grade A-F) for a specific endpoint, with full breakdown + flags. |
x402_endpoint_history | paid | Observation time-series for a specific endpoint (listings, price changes, probes). |
Paid tools cost a few tenths of a cent, charged over x402 (USDC on Base). If you
set X402_PRIVATE_KEY, the server auto-pays within your X402_MAX_USD
limit; otherwise it returns the price quote for your host to pay.
Install
Add to your MCP client config (e.g. Claude Desktop claude_desktop_config.json):
{
"mcpServers": {
"x402-trust": {
"command": "npx",
"args": ["-y", "x402-trust-mcp"]
}
}
}
To enable autonomous payment for the paid tools, add a funded Base USDC wallet:
{
"mcpServers": {
"x402-trust": {
"command": "npx",
"args": ["-y", "x402-trust-mcp"],
"env": {
"X402_PRIVATE_KEY": "0xYOUR_BASE_WALLET_KEY",
"X402_MAX_USD": "0.05"
}
}
}
}
Configuration (env vars)
| Var | Default | Description |
|---|---|---|
X402_TRUST_API_BASE | https://x402.fuchss.app | API base URL. |
X402_PRIVATE_KEY | (unset) | Base wallet private key (0x…). Enables auto-pay for paid tools. |
X402_MAX_USD | 0.05 | Per-call auto-pay ceiling. |
X402_TIMEOUT_MS | 20000 | Request timeout. |
The free tools work with no configuration at all.
Security
X402_PRIVATE_KEY is a hot wallet — fund it with only what you're willing to
spend on trust lookups. The key never leaves your machine; it signs EIP-3009
payment authorizations locally.
License
MIT
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