Tool detail

Preflight

Checks npm, PyPI or crates package names for existence, deprecation or yanked status, and suggests closest real names for ones not found.

Categories: Security

Use when

verify packages an LLM suggested actually exist before installing
catch a hallucinated or slopsquatted dependency name before install

Not for

not a safety or vulnerability verdict — existence/deprecation checks only

Inputs

POST JSON body: { ecosystem: enum[npm,pypi,crates] (required); packages: string array, 1-20 items (required) }

Admitted input schema

{
  "type": "object",
  "properties": {
    "ecosystem": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "enum": [
        "npm",
        "pypi",
        "crates"
      ]
    },
    "packages": {
      "type": "array",
      "items": {
        "type": "string",
        "minLength": 1,
        "maxLength": 214
      },
      "minItems": 1,
      "maxItems": 20
    }
  },
  "required": [
    "ecosystem",
    "packages"
  ],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://preflight402.com/v1/deps/check

Payment

Protocol: x402
Listed price: 0.05 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: POST https://preflight402.com/v1/deps/check
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z