Api Endpoint

Package Evidence

Deterministic npm package evidence: registry facts, distribution integrity, provenance, and factual flags for coding agents.

Open interactive test console

Offering

Provider: packages.melchiorlabs.com
Method: POST
Offering type: Api Endpoint
Transport type: http
Category: Development
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://packages.melchiorlabs.com/v1/npm/evidence
MIME type: application/json
First seen: 2026-10-16T02:03:37.480Z
Last seen: 2026-10-26T22:16:55.441Z
Tags: npm, Packages, dependencies, provenance, coding-agents

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.003 USDC
Atomic price: 3000 · Network: eip155:8453 · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3000",
    "payTo": "0x174fA5CC0E9C170FC8f361a15fcce3d9271Df880"
  }
]

Observed health

Status: Healthy
Latest latency: 410 ms
Average latency: 797 ms
HTTP status: 204
Last checked: 2026-11-02T14:56:45.995Z
Reachability: 92.9% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "body": {
    "package": "@x402/core",
    "version": "latest"
  },
  "type": "http",
  "method": "POST",
  "bodyType": "json"
}

Output schema

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "input"
  ],
  "properties": {
    "input": {
      "type": "object",
      "required": [
        "type",
        "method",
        "bodyType",
        "body"
      ],
      "properties": {
        "body": {
          "required": [
            "package"
          ],
          "properties": {
            "package": {
              "type": "string",
              "maxLength": 214,
              "description": "Public npm package name, scoped or unscoped, lowercase."
            },
            "version": {
              "type": "string",
              "default": "latest",
              "maxLength": 64,
              "description": "Exact semver or dist-tag."
            },
            "nodeVersion": {
              "type": "string",
              "maxLength": 64,
              "description": "Exact stable semver; enables the node_engine_mismatch flag."
            }
          }
        },
        "type": {
          "type": "string",
          "const": "http"
        },
        "method": {
          "enum": [
            "POST"
          ],
          "type": "string"
        },
        "bodyType": {
          "enum": [
            "json",
            "form-data",
            "text"
          ],
          "type": "string"
        }
      },
      "additionalProperties": false
    },
    "output": {
      "type": "object",
      "required": [
        "type"
      ],
      "properties": {
        "type": {
          "type": "string"
        },
        "example": {
          "type": "object"
        }
      }
    }
  }
}