Deterministic pre-install verification for npm packages, AI agent skills and MCP
Deterministic pre-install verification for npm packages, AI agent skills and MCP tools. Matches the exact version against OSV and OpenSSF malicious-package advisories, then runs behavioral analysis for credential theft, exfiltration, obfuscation, prompt injection and install-time droppers, returning a verdict with file-and-line evidence, a SHA-256 of what was analyzed, and a signed attestation that verifies offline. No LLM in the scan path, so the same input yields the same verdict.
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://lazaretto.dev/v1/scan
| Category | Everything else |
|---|---|
| Provider host | lazaretto.dev |
| 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 |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.03 | 397 ms |
Example input (from the provider)
{
"body": {
"depth": "full",
"target": {
"ref": "left-pad@1.3.0",
"type": "npm_package"
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"depth": {
"enum": [
"lookup",
"full"
],
"type": "string"
},
"target": {
"properties": {
"content": {
"type": "string"
},
"ref": {
"type": "string"
},
"type": {
"enum": [
"inline",
"raw_url",
"npm_package",
"github_repo",
"clawhub_skill"
],
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"target"
]
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}