Marketplace · API · x402

preflight402.com/v1/deps/version-check

Call before pinning or installing a specific package version in npm, PyPI or crates.io. Returns whether that exact version exists in the official registry, its publication timestamp, whether it is deprecated or yanked, its published artifact hashes, and whether an expected SRI/hex digest matches. Compares registry metadata only and never returns a safety verdict.

Endpoint	`https://preflight402.com/v1/deps/version-check`
Trust	100% uptime over 1 checks · ~792 ms
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
network	eip155:8453
scheme	exact
pay to	0xB9Db3966C7F18283624C97E860a84CEf7f9ba607
method	POST
last updated	2026-11-02T23:18:22.102Z

Use it

Call it (an x402 client pays automatically)

curl -i https://preflight402.com/v1/deps/version-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/x402-758a47acb68da9f8

Search the whole marketplace from your agent (MCP)

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