Roundhouse

chain-scan.com

Single-call Etherscan / Basescan query. Proxies the Etherscan API V2 unified endpoint: pass any module/action and chainid, get the raw JSON back. Covers Ethereum, Base, Arbitrum, Optimism, Polygon and other supported chains.

Otherofflineeip155:8453Exactvia cdp
https://chain-scan.com/v1/scan
Activity
—
Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record.
—
Verified settled volume
0 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0020
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-05-22 13:23Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x74Bf2FCC19d05332839f7A4a645BBD0065Cb2a54

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.

Accepts

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

0.002USDC≈ $0.002 USD
on Base · exact scheme

Pay 0.002 USDC on Base to 0x74Bf…b2a54. The signed payment is good for 2 minutes.

Paid to
0x74Bf…b2a54
USD Coin contract
0x8335…02913
Payment window
2 minutes
As published
2000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x74Bf2FCC19d05332839f7A4a645BBD0065Cb2a54",
    "amount": "2000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "tag": "latest",
          "action": "balance",
          "module": "account",
          "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
          "chainid": "8453"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "result": "207419433107",
          "status": "1",
          "message": "OK"
        }
      }
    },
    "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": [
                "module",
                "action"
              ],
              "properties": {
                "tag": {
                  "type": "string",
                  "description": "Block parameter such as 'latest', 'earliest', or a hex block number."
                },
                "page": {
                  "type": "string",
                  "description": "Page number for paginated results."
                },
                "sort": {
                  "enum": [
                    "asc",
                    "desc"
                  ],
                  "type": "string",
                  "description": "Result sort order."
                },
                "action": {
                  "type": "string",
                  "description": "Etherscan API action within the module, e.g. balance, txlist, tokentx, getabi, eth_getTransactionByHash."
                },
                "module": {
                  "type": "string",
                  "description": "Etherscan API module, e.g. account, contract, transaction, block, logs, proxy, stats, token."
                },
                "offset": {
                  "type": "string",
                  "description": "Page size for paginated results."
                },
                "txhash": {
                  "type": "string",
                  "description": "Transaction hash (for transaction endpoints)."
                },
                "address": {
                  "type": "string",
                  "description": "Account or contract address the query targets (when applicable)."
                },
                "chainid": {
                  "type": "string",
                  "description": "Target chain ID (Etherscan API V2). Examples: 1 Ethereum, 8453 Base, 42161 Arbitrum, 10 Optimism, 137 Polygon. Defaults to 1 if omitted."
                },
                "endblock": {
                  "type": "string",
                  "description": "End block for range queries."
                },
                "startblock": {
                  "type": "string",
                  "description": "Start block for range queries."
                },
                "contractaddress": {
                  "type": "string",
                  "description": "Token contract address (for token endpoints)."
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-05-22 13:23Z
Last indexed by Roundhouse
2026-06-11 02:40Z
Last enriched (probe, favicon, geo)
2026-09-22 16:45Z
x402 version
2
Max timeout
120s
Liveness probe
HTTP 0
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

Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record. 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 chain-scan.com 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=chain-scan.com'
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://chain-scan.com/v1/scan, 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. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

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