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x402station-mcp

MCP adapter for x402station.io — infrastructure for x402 agentic commerce. Exposes Preflight by x402station.io (the active flagship product, Evaluate direction) plus tools across all six capability directions: Discover (Catalog), Evaluate (Preflight), Pay (Credits), Monitor (Watch), Recover (Alternatives), Analyze (Forensics). Any agent speaking the Model Context Protocol gets one-call safety before signing PAYMENT-SIGNATURE — flags decoys, zombie services, dead endpoints, and price traps before paying them.

x402station.io independently probes every endpoint listed on agentic.market every 10 minutes — it sees what facilitator-based monitors can't, including endpoints priced ≥ $1,000 USDC that function as anti-scraper honeypots.

Install

# Claude Code / Cursor / Windsurf / Continue — works anywhere with MCP
npm install -g x402station-mcp
# or use npx in the config, no global install needed:

Configure

The adapter charges real USDC per call (via x402 itself — our oracle is dogfooded). You need a wallet private key that holds Base Sepolia USDC (or Base mainnet once we switch).

Claude Code

Add to ~/.claude/claude_desktop_config.json (or wherever your MCP servers live):

{
  "mcpServers": {
    "x402station": {
      "command": "npx",
      "args": ["-y", "x402station-mcp"],
      "env": {
        "AGENT_PRIVATE_KEY": "0xYOUR_PRIVATE_KEY_HERE"
      }
    }
  }
}

Cursor / Windsurf / Continue

Same shape — every MCP host understands command / args / env. See your tool's MCP docs.

Environment

Variable	Required	Default	Purpose
AGENT_PRIVATE_KEY	yes for any tool call	—	0x-prefixed 64-hex-char private key. Account must hold Base Sepolia USDC.
X402STATION_BASE_URL	no	https://x402station.io	Override for dev / testing.

Testnet USDC for the wallet: faucet.circle.com (pick Base Sepolia).

Tools

preflight(url) — $0.001 USDC

Ask whether it's safe to pay this x402 URL. Returns:

{
  "ok": true,
  "warnings": [],
  "metadata": {
    "service": "...",
    "price_usdc": "0.01",
    "uptime_1h_pct": 100,
    "avg_latency_ms": 412
  }
}

ok is true only when no critical warning fires. Warnings: unknown_endpoint, no_history, dead, zombie, decoy_price_extreme, suspicious_high_price, slow, new_provider.

forensics(url) — $0.001 USDC

Deep 7-day report. Superset of preflight. Returns hourly uptime, latency p50/p90/p99, status-code distribution, concentration-group stats, decoy probability. Extra warnings: dead_7d, mostly_dead, slow_p99, price_outlier_high, high_concentration.

catalog_decoys() — $0.005 USDC

Full blacklist. Returns every active endpoint currently flagged critical, plus per-reason counts. Pull periodically and cache locally — cheaper than preflighting every URL.

Typical agent flow

agent wants data from some_endpoint.com
    │
    ├─ preflight("https://some_endpoint.com/data")  ← $0.001
    │     ok: false, warnings: ["decoy_price_extreme"]
    │
    └─ skip; try the next candidate

For bulk discovery, do catalog_decoys() once per day and treat the result as a set-difference against any URLs you're about to hit.

Links

• Oracle: https://x402station.io
• Manifest: https://x402station.io/.well-known/x402
• OpenAPI: https://x402station.io/api/openapi.json
• Dataset: https://huggingface.co/datasets/x402station/preflight-dataset-v0_1
• GitHub: https://github.com/sF1nX/x402station-mcp
• x402 spec: https://x402.org

Contact

• General + commercial: [email protected]
• Bug reports: https://github.com/sF1nX/x402station-mcp/issues
• Security disclosures (RFC 9116): https://x402station.io/.well-known/security.txt

License

MIT