Marketplace · API · x402

preflight402.com/v1/deps/check

Call before installing packages suggested by a language model. Returns, for each npm or PyPI package name, whether it actually exists in the registry, whether it is deprecated or yanked, and — when the name is not found — the closest real package names. Catches hallucinated dependencies (slopsquatting) before an agent installs them. Never inspects package contents and never returns a safety verdict.

Endpointhttps://preflight402.com/v1/deps/check
Trust100% uptime over 1 checks · ~506 ms
PricingPay per call with x402, no account. Call it to get an exact quote before paying.
networkeip155:8453
schemeexact
pay to0xB9Db3966C7F18283624C97E860a84CEf7f9ba607
methodPOST
last updated2026-10-23T23:00:51.421Z

Use it

Call it (an x402 client pays automatically)

curl -i https://preflight402.com/v1/deps/check
# 402 reply -> sign PAYMENT-REQUIRED with an x402 client (e.g. @x402/fetch) -> retry with PAYMENT-SIGNATURE

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/x402-a486722670764d10

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}

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