onyx_merchant_fact_check
ActiveTool of onyx-paid-mcp
declared in 1.26.0
Pre-checkout merchant fact oracle. Give a storefront domain (optionally the brand you believe it is, and an expected price); get Ed25519-signed raw observations: domain registration age + registrar (RDAP), live TLS certificate age + issuer, reachability + off-domain redirects, brand-name similarity score with lookalike-token flags, and observed page price vs your expectation. Facts only, method disclosed per field — Onyx never asserts 'legit' or 'scam'; the signature proves the observation is genuine and untampered. (price: $0.25 USDC, tier: premium)
Parameters schema
{
"type": "object",
"required": [
"domain"
],
"properties": {
"brand": {
"type": "string",
"description": "Optional brand name you believe this storefront represents (e.g. 'Russell & Bromley'). Enables the brand-similarity observation."
},
"domain": {
"type": "string",
"description": "Storefront domain or URL, e.g. brand-outlet-sale.com or https://shop.example.com/p/1"
},
"product_url": {
"type": "string",
"description": "Optional specific product URL to extract the observed price from (defaults to the domain root)."
},
"expected_price": {
"type": "number",
"description": "Optional price you were quoted/expect. If the page shows a price, the deviation percentage is reported as a fact."
}
}
}Parent server
onyx-paid-mcp
https://github.com/dimitrilaouanis-tech/onyx-mcp
2/7 registries