# URL Safety & Reputation Checker (agent-exec.448c.org/check/url)

> URL Safety & Reputation Checker (agent-exec.448c.org/check/url) is a paid API for AI agents from agent-exec.448c.org, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-11).

Checks a given URL or domain for safety, returning a verdict, numeric risk score, reasons, and sources — paid per-call via x402 with no account required.

## Facts

- Endpoint: POST https://agent-exec.448c.org/check/url?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/url-safety-reputation-checker-agent-exec-448c-org-check-url-7c7014a1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_z64HLnmr7WEXWoKLdUejV

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 url-safety-reputation-checker-agent-exec-448c-org-check-url-7c7014a1 -d '<json body>'
```

Example prompt: Can you check whether https://suspicious-login-paypal.xyz is safe or a phishing site? Give me the risk score and reasons.

## When to prefer this

Choose this endpoint when you need accountless, pay-per-call URL/domain safety checking with on-chain payment provenance via x402/USDC — ideal for AI agents that cannot maintain persistent API credentials, need audit trails via blockchain transactions, or are operating in trustless environments. Prefer over traditional URL-scanning APIs when zero-setup and micropayment-native access matter more than high-volume throughput.

## Known failure modes

- Invalid or malformed URL input returns an error
- Unreachable or very new domains may have sparse reasons and low-confidence scores
- Payment failure (insufficient USDC balance or x402 negotiation failure) results in HTTP 402 with no result
- Network or sandbox timeout may result in no response
- False negatives possible for newly registered malicious domains not yet indexed by sources

## How this service works

Accountless, pay-per-use code execution for software agents: submit source code, get stdout, stderr and exit code back from an isolated, network-less sandbox. No account, no API key -- possession of valid payment is sufficient.

## Output

Returns a JSON object with: `verdict` (e.g. safe/malicious/suspicious), `score` (numeric risk score), `reasons` (array of human-readable explanation strings), `sources` (array of threat intel sources consulted), `disclaimer`, and a `payment` object with asset, payer, amount in atomic units, network, and on-chain transaction hash for the USDC payment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "description": "An http(s) URL or bare domain to check."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "verdict",
  "score",
  "reasons",
  "sources",
  "disclaimer",
  "payment"
 ],
 "properties": {
  "score": {
   "type": "number"
  },
  "payment": {
   "type": "object",
   "properties": {
    "asset": {
     "type": "string"
    },
    "payer": {
     "type": "string"
    },
    "amount": {
     "type": "string",
     "description": "Atomic units charged."
    },
    "network": {
     "type": "string"
    },
    "transaction": {
     "type": "string",
     "description": "On-chain settlement transaction."
    }
   }
  },
  "reasons": {
   "type": "array",
   "items": {
    "type": "string"
   }
  },
  "sources": {
   "type": "array",
   "items": {
    "type": "string"
   }
  },
  "verdict": {
   "type": "string"
  },
  "disclaimer": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/url-safety-reputation-checker-agent-exec-448c-org-check-url-7c7014a1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-exec.448c.org](https://www.zero.xyz/host/agent-exec.448c.org/llms.txt)