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Cairnworks Verify — Brand Check
x402
Cairnworks Verify — Brand Check is a paid API for AI agents from cairnworks-verify.run402.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-28).
Checks brand name availability and existing claims across domains, social handles, app stores, and trademark registries, returning signed JSON evidence with SHA256 digest.
Price / call$0.02
Success—
StatusUnknown
How this service works
cairnworks verify — fixed-price x402 (USDC on Base) checks for agent payouts: verify a Base/BSC transaction receipt and ERC-20 transfers (0.01), audit a URL's status/redirects/paywall flags (0.01), token holder and treasury share audit at a block (0.02), batch-verify up to 10 payout receipts (0.02). No account, no API key; every response is signed JSON with a sha256 evidence digest. Free sample outputs at /samples (no payment).
Output
Returns signed JSON containing per-name claim results across requested check types (domain, social, app, tm), with availability verdicts, evidence URLs, HTTP statuses, SHA256 hashes of raw evidence, and a top-level evidence_sha256 digest for the full response. Includes a disclaimer that results are evidence only and not legal advice.
Example use cases
Startup name availability audit
“Before we finalize our startup name 'Veldra', can you check if the domain and social handles are available and whether there's any existing trademark on it?”
Pre-launch brand conflict check
“We're about to launch a product called 'Arcflow' — can you verify domain availability, check social media handles, and flag any trademark issues so we have documented evidence?”
App store name clearance
“I want to release an app called 'Nestly' — please check if that name is available on app stores and as a domain, and give me a signed report I can share with our legal team.”
Technical details
Endpoint
POSThttps://cairnworks-verify.run402.com/brand-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need cryptographically signed, auditable evidence of brand name availability across multiple dimensions (domain, social, app, trademark) in a single call, especially when the evidence needs to be retained for legal or compliance purposes. It is distinctly useful for AI agents that need to produce verifiable documentation rather than informal availability checks, and when no API key or account setup is desired — payment is per-call via USDC on Base.
Side effects
- Payment not received — endpoint returns 402 requiring USDC payment on Base before response is issued
- Invalid brand name length (must be 2–40 characters) returns validation error
- More than 5 names submitted exceeds maxItems limit
- Unsupported check type enum value causes rejection
- Upstream RDAP or social lookup timeout may delay or degrade evidence collection
- tm check marked as unmeasured if trademark registry is unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| names | array | |
| checks | array |
Output
Schema · Response
{
"type": "json",
"example": {
"kind": "brand_check",
"names": [
{
"name": "cairnworks",
"claims": [
{
"name": "cairnworks.io",
"check": "domain",
"verdict": "available",
"evidence": [
{
"url": "https://rdap.org/domain/cairnworks.io",
"checked_at": "…",
"sha256_raw": "…",
"http_status": 404
}
]
}
],
"handle": "cairnworks",
"measured": [
"domain:cairnworks.io"
],
"unmeasured": []
}
],
"measured": [
"domain:cairnworks.io"
],
"checked_at": "2026-10-18T22:15:00Z",
"disclaimer": "Evidence only - NOT legal advice, nothing reserved.",
"unmeasured": [
"tm:us"
],
"block_time_ms": 3200,
"evidence_sha256": "…"
}
}Tags
x402
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