onyx_payment_gate
ActiveTool of onyx-paid-mcp
declared in 1.26.0
Pre-payment clearance for agents. Call this BEFORE settling with a merchant over x402/AP2: give the merchant domain (optionally the amount and the price you expect to pay). Onyx assembles a single hard clearance — PROCEED / REVIEW / HOLD — from its Ed25519-signed observation log: Onyx-Verified status, live TLS/reachability/off-domain-redirect facts, domain age, and observed-vs-expected price. Facts with methods disclosed, signed and verifiable; Onyx never asserts the merchant is honest — it ensures you read real signed ground-truth before you move money. The check agents run at the payment chokepoint. (price: $0.05 USDC, tier: metered)
Parameters schema
{
"type": "object",
"required": [
"domain"
],
"properties": {
"brand": {
"type": "string",
"description": "Optional brand the merchant CLAIMS to be (e.g. 'Russell & Bromley'). If a well-known brand is claimed on a freshly-registered domain, the clearance is HELD — the cloned-storefront pattern."
},
"domain": {
"type": "string",
"description": "Merchant domain or URL you are about to pay, e.g. shop.example.com"
},
"amount_usd": {
"type": "number",
"description": "Optional amount you are about to pay (for the record; large amounts lower the auto-PROCEED bar)."
},
"product_url": {
"type": "string",
"description": "Optional specific product URL to read the observed price from."
},
"expected_price": {
"type": "number",
"description": "Optional price you were quoted/expect. If the page shows a price, a large deviation downgrades the clearance."
}
}
}Parent server
onyx-paid-mcp
https://github.com/dimitrilaouanis-tech/onyx-mcp
2/7 registries