Roundhouse

x402-domain-check.vercel.app

The autonomous stack for every app and agent.

TradingLiveeip155:8453Exactvia facilitator:thirdweb
https://x402-domain-check.vercel.app/drugs/price
Calls · 30d
1
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 11 snapshots so far.
$0.59
Verified settled volume
26 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
0 transactions, checked 2026-11-07 09:45Z
Paid to
0x94D642596761470161B37771FAC222111A5FfAd6

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x94D642596761470161B37771FAC222111A5FfAd6",
      "amount": "20000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://x402-domain-check.vercel.app/drugs/price",
    "mimeType": "application/json",
    "description": "US drug acquisition cost from CMS NADAC (National Average Drug Acquisition Cost, weekly): search by drug name (brand or generic, optional strength) or by NDC. Returns latest NADAC per unit, pricing unit (EA/ML/GM), effective date, generic vs brand, OTC flag and the corresponding generic price for brands. Names not found in NADAC descriptions are resolved to NDCs via the openFDA NDC directory. Pharmacy acquisition cost, not patient cash price. Not charged on errors."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "name": "lipitor",
            "limit": 5
          }
        },
        "output": {
          "type": "json",
          "example": {
            "query": {
              "name": "lipitor"
            },
            "source": {
              "name": "NADAC, Centers for Medicare & Medicaid Services (data.medicaid.gov)",
              "license": "public domain"
            },
            "matched": true,
            "asOfDate": "2026-10-28",
            "products": [
              {
                "otc": false,
                "ndcCount": 1,
                "sampleNdcs": [
                  "58151015577"
                ],
                "description": "LIPITOR 10 MG TABLET",
                "pricingUnit": "EA",
                "nadacPerUnit": 13.4182,
                "effectiveDate": "2026-10-21",
                "genericOrBrand": "brand",
                "nadacPerUnitMax": 13.4182,
                "correspondingGenericNadacPerUnit": 0.02301
              }
            ],
            "resolvedVia": "name",
            "productCount": 4
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [],
                "properties": {
                  "ndc": {
                    "type": "string",
                    "description": "NDC: 11 digits or hyphenated 4-4-2 / 5-3-2 / 5-4-1"
                  },
                  "name": {
                    "type": "string",
                    "description": "Brand or generic name, optionally with strength, e.g. 'atorvastatin 10 mg' (2-80 chars)"
                  },
                  "limit": {
                    "type": "integer",
                    "default": 10,
                    "maximum": 50,
                    "minimum": 1,
                    "description": "Max products (name search)"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.02USDC≈ $0.02 USD
on Base · exact scheme

Pay 0.02 USDC on Base to 0x94D6…FfAd6. The signed payment is good for 5 minutes.

Paid to
0x94D6…FfAd6
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
20000 smallest units
Returns
application/json
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x94D642596761470161B37771FAC222111A5FfAd6",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://x402-domain-check.vercel.app/drugs/price",
    "description": "",
    "maxAmountRequired": "20000",
    "maxTimeoutSeconds": 300
  }
]

Provenance

Seen in the source catalog
2026-10-29 18:53Z
Last indexed by Roundhouse
2026-11-07 09:15Z
Last enriched (probe, favicon, geo)
2026-11-07 09:45Z
x402 version
1
Max timeout
300s
Liveness probe
HTTP 402
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 11 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service x402-domain-check.vercel.app and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=x402-domain-check.vercel.app'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://x402-domain-check.vercel.app/drugs/price, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.