# SiteCheck Web Intel – MalwareBazaar File Hash Lookup

> SiteCheck Web Intel – MalwareBazaar File Hash Lookup is a paid API for AI agents from api.webintel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-25).

Looks up a file hash (SHA-256, SHA-1, or MD5) in abuse.ch MalwareBazaar and returns full metadata about the malware sample, including hashes, malware family, file type, first/last seen, tags, and delivery method — without downloading the sample.

## Facts

- Endpoint: GET https://api.webintel-api.workers.dev/api/security/malbazaar-samples?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-web-intel-malwarebazaar-file-hash-lookup-75d8e959
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ynEpGSSv540nPM8lSFNCC

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sitecheck-web-intel-malwarebazaar-file-hash-lookup-75d8e959
```

Example prompt: Can you check if the file hash 44d88612fea8a8f36de82e1278abb02f is known malware — look it up in MalwareBazaar and tell me the malware family, file type, when it was first seen, and how it was delivered?

## When to prefer this

Choose this endpoint when you need fast, structured malware metadata for a specific file hash without downloading the sample. It is ideal for triage, incident response enrichment, and threat intelligence workflows where you already have a hash and want to check against the community-maintained MalwareBazaar database. Prefer this over general VirusTotal-style endpoints when the primary need is abuse.ch community data including reporter, delivery method, and origin country attribution.

## Known failure modes

- Hash not found in MalwareBazaar — sample is unknown or clean
- Invalid hash format (wrong length or non-hex characters) — request rejected
- MalwareBazaar API unavailable — upstream timeout or outage
- Malformed hash parameter — missing or empty 'hash' query param returns error
- Rate limiting or payment failure for the $0.002 per-call fee

## How this service works

Looks up a file hash (SHA-256, SHA-1 or MD5) in abuse.ch MalwareBazaar: whether the sample is known, its other hashes, file name, type, size, signature (malware family), first/last seen, reporter, origin country, delivery method, tags, download count and code-signing info. Metadata only; the sample itself is never downloaded.

## Output

Returns metadata about the matching malware sample from MalwareBazaar: all hash variants (SHA-256, SHA-1, MD5), file name, file type, file size, malware family/signature, first seen and last seen timestamps, reporter, origin country, delivery method, associated tags, download count, and code-signing information. The actual file binary is never returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "hash"
     ],
     "properties": {
      "hash": {
       "type": "string",
       "description": "SHA-256 (64 hex), SHA-1 (40 hex) or MD5 (32 hex) of the file (required)"
      },
      "sha256": {
       "type": "string",
       "description": "Same as hash (older name)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-web-intel-malwarebazaar-file-hash-lookup-75d8e959/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.webintel-api.workers.dev](https://www.zero.xyz/host/api.webintel-api.workers.dev/llms.txt)