Roundhouse

CortexCloud

Batch NFT ownership across addresses (Alchemy). x402-paid, USDC on Base.

DataLiveeip155:8453Exactvia cdp
https://api.cortexcloud.org/v1/aggregate/nfts
OnchainCryptoBlockchainDatax402
Calls · 30d
3
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$10.79
Verified settled volume
296 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0040
Listed price
As published in the catalog. Always read the live 402 before paying.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-23 02:11Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x5a0353bc9c75b893a9b5735d3e79f1bd988ea143

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.

{
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x5a0353bc9c75b893a9b5735d3e79f1bd988ea143",
      "amount": "4000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://api.cortexcloud.org/v1/aggregate/nfts",
    "tags": [
      "onchain",
      "crypto",
      "blockchain",
      "data",
      "x402"
    ],
    "iconUrl": "https://api.cortexcloud.org/cortex-logo-v2.png",
    "mimeType": "application/json",
    "description": "Batch NFT ownership across addresses (Alchemy). x402-paid, USDC on Base.",
    "serviceName": "CortexCloud"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": "ethereum",
            "addresses": "['0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045']"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "nfts": [
              {
                "name": "vitalik.wei",
                "owners": [
                  "0xd8da6bf26964af9d7eed9e03e53415d37aa96045"
                ],
                "contract": "0x0000000000696760e15f265e828db644a0c242eb",
                "token_id": "34454361969670104802583458346517400542074712368450903800518897101070583190115"
              },
              {
                "name": "vitalik.cloud",
                "owners": [
                  "0xd8da6bf26964af9d7eed9e03e53415d37aa96045"
                ],
                "contract": "0x0000000000cf80e7cf8fa4480907f692177f8e06",
                "token_id": "73906452355594127029039375271145516945927406532858726769026903911185640775143"
              }
            ],
            "chain": "ethereum",
            "currency": "USDC",
            "cache_hit": false,
            "nft_count": 100,
            "price_usd": 0.004,
            "addresses_count": 1
          }
        }
      },
      "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": {
                "type": "string",
                "const": "GET"
              },
              "queryParams": {
                "type": "object",
                "additionalProperties": {
                  "type": "string"
                }
              }
            }
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {}
            }
          }
        }
      }
    }
  },
  "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.

0.004USDC≈ $0.004 USD
on Base · exact scheme

Pay 0.004 USDC on Base to 0x5a03…ea143. The signed payment is good for 1 minute.

Paid to
0x5a03…ea143
USD Coin contract
0x8335…02913
Payment window
1 minute
As published
4000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x5a0353bc9c75b893a9b5735d3e79f1bd988ea143",
    "amount": "4000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "chain": "ethereum",
          "addresses": [
            "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
          ]
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "nfts": [
            {
              "name": "vitalik.wei",
              "owners": [
                "0xd8da6bf26964af9d7eed9e03e53415d37aa96045"
              ],
              "contract": "0x0000000000696760e15f265e828db644a0c242eb",
              "token_id": "34454361969670104802583458346517400542074712368450903800518897101070583190115"
            },
            {
              "name": "vitalik.cloud",
              "owners": [
                "0xd8da6bf26964af9d7eed9e03e53415d37aa96045"
              ],
              "contract": "0x0000000000cf80e7cf8fa4480907f692177f8e06",
              "token_id": "73906452355594127029039375271145516945927406532858726769026903911185640775143"
            }
          ],
          "chain": "ethereum",
          "currency": "USDC",
          "cache_hit": false,
          "nft_count": 100,
          "price_usd": 0.004,
          "addresses_count": 1
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "addresses"
              ],
              "properties": {
                "chain": {
                  "type": "string",
                  "default": "ethereum"
                },
                "addresses": {
                  "type": "array",
                  "items": {
                    "type": "string",
                    "pattern": "^0x[0-9a-fA-F]{40}$"
                  },
                  "maxItems": 20,
                  "minItems": 1
                },
                "page_size": {
                  "type": "integer",
                  "default": 100,
                  "maximum": 100,
                  "minimum": 1
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "bodyType": {
              "type": "string",
              "const": "json"
            }
          }
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {}
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-23 02:11Z
Last indexed by Roundhouse
2026-10-26 17:20Z
Last enriched (probe, favicon, geo)
2026-10-23 01:46Z
x402 version
2
Max timeout
60s
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. 4 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 CortexCloud 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=CortexCloud'
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://api.cortexcloud.org/v1/aggregate/nfts, 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.