Detect whether normalized public npm or PyPI package registry state changed sinc
Detect whether normalized public npm or PyPI package registry state changed since a saved fingerprint. Returns a deterministic SHA-256 fingerprint for package/version existence, latest/resolved version, deprecation or yank state, license and runtime requirement. No dependency graph, vulnerability scan or registry mutation. Base mainnet USDC
Answeringour last check, 2026-10-10
1 of 1checks answered this week
940 msmedian answer time
$0.002listed price per call
$0.002price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/package/changed
| Category | Code and developer |
|---|---|
| Provider host | http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-10 | valid payment request | 402 | $0.002 | 940 ms |
Example input (from the provider)
{
"body": {
"ecosystem": "npm",
"package": "express",
"version": "4.21.2"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"ecosystem": {
"description": "Public ecosystem value used to scope this lookup.",
"enum": [
"npm",
"pypi"
]
},
"package": {
"description": "Public package name to inspect.",
"maxLength": 214,
"minLength": 1,
"type": "string"
},
"previous_hash": {
"description": "Earlier result hash used to detect a material change.",
"pattern": "^[a-fA-F0-9]{64}$",
"type": [
"string",
"null"
]
},
"version": {
"description": "Package version whose public metadata should be checked.",
"maxLength": 128,
"minLength": 1,
"type": "string"
}
},
"required": [
"ecosystem",
"package"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"capability": {
"const": "package.changed",
"description": "Public capability value used to scope this lookup."
},
"data": {
"additionalProperties": false,
"description": "Public data value used to scope this lookup.",
"properties": {
"changed": {
"description": "Public changed value used to scope this lookup.",
"type": [
"boolean",
"null"
]
},
"ecosystem": {
"description": "Public ecosystem value used to scope this lookup.",
"enum": [
"npm",
"pypi"
]
},
"fingerprint_fields": {
"description": "Public fingerprint fields value used to scope this lookup.",
"items": {
"enum": [
"ecosystem",
"package",
"exists",
"requested_version",
"requested_version_exists",
"resolved_version",
"latest_version",
"outdated",
"deprecated",
"yanked",
"license",
"requires_runtime"
]
},
"maxItems": 12,
"minItems": 12,
"type": "array"
},
"new_hash": {
"description": "Public new hash value used to scope this lookup.",
"pattern": "^[a-fA-F0-9]{64}$",
"type": "string"
},
"package": {
"description": "Public package name to inspect.",
"type": "string"
},
"previous_hash": {
"description": "Earlier result hash used to detect a material change.",
"pattern": "^[a-fA-F0-9]{64}$",
"type": [
"string",
"null"
]
},
"scope": {
"const": "package_registry_metadata_only_no_dependency_graph",
"description": "Public scope value used to scope this lookup."
},
"state": {
"additionalProperties": false,
"description": "Public state value used to scope this lookup.",
"properties": {
"deprecated": {
"description": "Public requested version exists value used to scope this lookup.",
"type": [
"boolean",
"null"
]
},
"ecosystem": {
"description": "Public ecosystem value used to scope this lookup.",
"enum": [
"npm",
"pypi"
]
},
"exists": {
"description": "Public exists value used to scope this lookup.",
"type": "boolean"
},
"latest_version": {
"description": "Public requested version value used to scope this lookup.",
"type": [
"string",
"null"
]
},
"license": {
"description": "Public requested version value used to scope this lookup.",
"type": [
"string",
"null"
]
},
"outdated": {
"description": "Public requested version exists value used to scope this loo