{
  "x402Version": 2,
  "id": 3621,
  "slug": "3621",
  "resource": "https://attester.dev/v1/package/exists",
  "description": "Deterministic package existence for PyPI and npm, built from real published artifacts (never LLM guesses). Negative answers and typosquat-adjacency flags carry signed proof. $0.002 USDC per check.",
  "type": "http",
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "payTo": "0x57407D691F755cAa107647718F3582a8A87467dD",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "amount": "2000",
      "maxTimeoutSeconds": 300
    }
  ],
  "outputSchema": {
    "bazaar": {
      "category": "ai",
      "discoverable": true,
      "info": {
        "input": {
          "body": {
            "ecosystem": "pypi",
            "name": "requests"
          },
          "bodyType": "json",
          "method": "POST",
          "type": "http"
        },
        "output": {
          "example": {
            "exists": true,
            "latest_version": "2.32.3",
            "proof": {
              "artifact_sha256": "0x…",
              "source_url": "https://pypi.org/project/requests/"
            },
            "typosquat_adjacent": false
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "body": {
                "properties": {
                  "ecosystem": {
                    "enum": [
                      "pypi",
                      "npm"
                    ],
                    "type": "string"
                  },
                  "name": {
                    "description": "Package name",
                    "type": "string"
                  }
                },
                "required": [
                  "ecosystem",
                  "name"
                ],
                "type": "object"
              },
              "bodyType": {
                "enum": [
                  "json"
                ],
                "type": "string"
              },
              "method": {
                "enum": [
                  "POST"
                ],
                "type": "string"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "type": "object"
              }
            },
            "required": [
              "example"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ]
      }
    }
  },
  "tags": [
    "bazaar"
  ],
  "sourceHost": "attester.dev",
  "lastUpdated": "2026-09-14T19:48:44.134Z",
  "quality": {
    "calls30d": 3,
    "uniquePayers30d": 3,
    "lastCalledAt": "2026-09-14T19:48:40.98Z"
  },
  "liveness": {},
  "verified": false,
  "featured": false,
  "provider": {
    "host": "attester.dev",
    "manifest_name": "attester.dev",
    "source": "cdp-mirror",
    "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources",
    "submitted_at": "2026-09-18T22:00:31.484Z"
  }
}