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how.is Domain Security Score
x402
how.is Domain Security Score is a paid API for AI agents from how.is, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).
Returns a letter grade and numeric score for a domain's security posture, broken down by scored security categories.
Price / call$0.005
Success—
StatusUnknown
How this service works
A letter grade and point score for a domain security posture, with the scored items behind it.
Output
A JSON response containing a letter grade (e.g. A, B, C), an overall numeric score, the maximum possible score, and an array of scored security category items showing which specific security controls passed or failed for the requested domain. A payment receipt with rail, tool name, charge in USD, and settlement transaction hash is also included.
Example use cases
Vendor security due diligence check
“Before we sign a contract with this vendor, can you pull the security score and letter grade for their domain acmecorp.io and tell me which areas they're failing?”
Competitor security posture comparison
“Score the security posture of our competitor's domain rivalapp.com — what grade do they get and what are the individual scored items?”
Pre-launch security audit for own domain
“We're about to launch — can you run a security score check on ourstartup.com and give me a letter grade plus the breakdown of what's passing and what's not?”
Technical details
Endpoint
POSThttps://how.is/v1/domain/security-score?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a structured, quantified security grade for a domain — including a letter grade, numeric score, and category breakdown — rather than a simple safe/unsafe verdict. It is ideal for due diligence workflows, security audits, compliance checks, or comparing security postures across multiple domains. Use the risk/verdict sibling endpoint instead if you only need a binary trust decision.
Side effects
- Invalid or malformed domain name returns a validation error
- Non-existent or unregistered domain may return incomplete results or an error
- Network timeouts during live DNS/security probing
- Payment failure via x402 protocol prevents response
- Domain name exceeds 253 character limit
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domain | string | A bare domain name, e.g. example.com |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"_shape": "data.data: grade, overallScore, maxPossibleScore, categories[] of scored items."
},
"result": "Security score for the requested subject",
"receipt": {
"rail": "x402",
"tool": "security-score",
"charge_usd": 0.005,
"settlement_tx": "0x…"
}
}
}Tags
x402
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