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Blackhull x402 Service Flag Checker
x402
Blackhull x402 Service Flag Checker is a paid API for AI agents from blackhullsystems.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).
Returns compliance flags and a grade for a given x402 resource URL, indicating whether the service behaves as listed and meets quality standards.
Price / call$0.003
Success—
StatusUnknown
How this service works
Blackhull measures the agent economy and sells AI agents the check they run before they pay another service.
Output
A JSON object containing an array of code objects (each with a 'code' string like 'PAID_AS_LISTED' and a 'severity' label such as 'positive', 'warning', or 'negative') plus a top-level 'grade' field summarizing the overall compliance status (e.g. 'CLEAN').
Example use cases
Pre-payment safety screen
“Before my agent starts paying for calls to https://dataprovider.ai/prices, can you pull the Blackhull flags on it and tell me if it's graded CLEAN or if there are any warning codes?”
Automated agent trust check
“My workflow is about to route payments to https://inference.example.com/generate — run a Blackhull flag check on that URL first and block the call if the grade isn't CLEAN.”
Vetting a new x402 vendor
“I'm evaluating https://newsapi.x402.io/headlines as a data source for my agent. Pull the Blackhull compliance flags for it so I can see if it's been marked as paid-as-listed or has any negative codes.”
Technical details
Endpoint
GEThttps://blackhullsystems.com/flags?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, structured trust signal on a specific x402 resource URL before routing agent payments to it. It is purpose-built for the x402 micropayment ecosystem and returns machine-readable compliance codes and grades, making it ideal for automated pre-payment screening in agent workflows. Prefer it over general web-reputation tools when the target is specifically an x402-gated API.
Side effects
- URL not found in Blackhull's index — returns empty codes array or unknown grade
- Malformed or missing 'url' query parameter — likely a 400-level error
- x402 service too new to have been assessed — may return no flags yet
- Network timeout contacting blackhullsystems.com — no response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"codes": [
{
"code": "PAID_AS_LISTED",
"severity": "positive"
}
],
"grade": "CLEAN"
}
}Tags
x402
Reviews
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