npm-package-facts

Return live npm registry facts for the latest or requested package version without the higher-priced vulnerability and adoption decision layer.

Price: $0.01 USDC equivalent
Endpoint: POST /v1/npm-package-facts
Network: Base mainnet · eip155:8453
Asset: USDC
MCP tool: npm-package-facts
External payability: PASS · 2026-10-08T19:55:01.298Z

When an agent should use it

npm package facts
latest npm package metadata
read npm package version license and deprecation

Input schema

{
  "type": "object",
  "properties": {
    "package": {
      "type": "string",
      "minLength": 1,
      "maxLength": 214
    },
    "version": {
      "type": "string",
      "maxLength": 64
    }
  },
  "required": [
    "package"
  ],
  "additionalProperties": false
}

Example request

{
  "package": "hono",
  "version": "4.13.3"
}

Example output

{
  "package": "hono",
  "version": "4.13.3",
  "license": "MIT",
  "deprecated": false
}

x402 flow

POST /v1/npm-package-facts
→ HTTP 402 + PAYMENT-REQUIRED
→ buyer authorizes locally
→ retry same request with PAYMENT-SIGNATURE
→ one governed execution + machine-readable JSON

Discovery: OpenAPI · x402 · llms.txt

A valid 402/payability probe is operational evidence, not proof of independent demand, future settlement, or semantic correctness.