Roundhouse

SiteCheck

Large stablecoin and major-token transfers in the last few minutes on Ethereum, Base, Arbitrum, Optimism or Polygon: hash, block time, sender, receiver, amount and USD value at the Coinbase spot price, sorted by value. Labels only for a few known addresses; others are null. One token contract is read over public RPC, so the window is short. Information only, not financial advice.

TradingLiveeip155:8453Exactvia cdp
https://api.sitecheck-api.workers.dev/api/crypto/whales
Whale transfersStablecoinsUsdcLarge transfersOn-chain
Calls · 30d
3
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 15 snapshots so far.
$7.88
Verified settled volume
2,995 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0030
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.
3
Unique payers · 30d
Last called 2026-10-21 21:45Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xb8491F953e6860D3b5840b73c60883Ff099ceAfA

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.

0.003USDC≈ $0.003 USD
on Base · exact scheme

Pay 0.003 USDC on Base to 0xb849…ceAfA. The signed payment is good for 5 minutes.

Paid to
0xb849…ceAfA
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
3000 smallest units
3000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
J8vnmB…BRdhR
Token contract
EPjFWd…TDt1v
Payment window
5 minutes
3000units
on eip155:5042 · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
0xa475…39be3
Token contract
0x3600…00000
Payment window
5 minutes
0.003units
on xrpl:0 · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
rDxNZC…Cf8UJ
Token contract
524C55…00000
Payment window
5 minutes
2171units
on xrpl:0 · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
rDxNZC…Cf8UJ
Token contract
XRP
Payment window
5 minutes
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xb8491F953e6860D3b5840b73c60883Ff099ceAfA",
    "amount": "3000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
    },
    "payTo": "J8vnmBx4pS1X7UUBTfz1yWBKiw69Dj2yRGRHDaXBRdhR",
    "amount": "3000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x3600000000000000000000000000000000000000",
    "extra": {
      "name": "USDC",
      "version": "2"
    },
    "payTo": "0xa4751fCAa83c9669cfe507bb6807507729839be3",
    "amount": "3000",
    "scheme": "exact",
    "network": "eip155:5042",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "524C555344000000000000000000000000000000",
    "extra": {
      "issuer": "rMxCKbEDwqr76QuheSUMdEGf4B9xJ8m5De",
      "invoiceId": "d06cc9f3-ae03-4555-afd0-5a875f1442a0",
      "sourceTag": 804681468,
      "areFeesSponsored": false
    },
    "payTo": "rDxNZCDfLxUzeMWGGwsY3sjQT8eoZCf8UJ",
    "amount": "0.003",
    "scheme": "exact",
    "network": "xrpl:0",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "XRP",
    "extra": {
      "invoiceId": "72c03f4c-1563-4403-becb-492a38645ae6",
      "sourceTag": 804681468,
      "areFeesSponsored": false
    },
    "payTo": "rDxNZCDfLxUzeMWGGwsY3sjQT8eoZCf8UJ",
    "amount": "2171",
    "scheme": "exact",
    "network": "xrpl:0",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "chain": "base",
          "limit": "3",
          "token": "USDC",
          "blocks": "20",
          "minUsd": "100000"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "note": "Transfers from one token contract only, in the block window shown, valued at the spot price now. Labels cover only the addresses listed in the bundled file; the rest are null.",
          "chain": "base",
          "token": "USDC",
          "total": 39,
          "minUsd": 100000,
          "source": "base JSON-RPC (eth_blockNumber, eth_getLogs on the ERC-20 Transfer topic of USDC, eth_getBlockByNumber); Coinbase spot price USDC-USD",
          "window": {
            "blocks": 20,
            "toBlock": 52628693,
            "fromBlock": 52628674
          },
          "scanned": 1559,
          "decimals": 6,
          "priceUsd": 1,
          "returned": 3,
          "checkedAt": "2026-10-15T06:45:34.462Z",
          "transfers": [
            {
              "to": {
                "kind": null,
                "label": null,
                "address": "0x2192bc3b4028acc1113f2cd9ac2cba70c36520db"
              },
              "usd": 476382.22,
              "from": {
                "kind": null,
                "label": null,
                "address": "0x3fe04a59ebd38cf06080a6f60a98d124eb59392a"
              },
              "time": "2026-10-15T06:45:01.000Z",
              "block": 52628677,
              "amount": 476382.22,
              "txHash": "0x9a31c1e50c5bdd94e1d79a2dc6e2a7817b84a9bbeff098c8da5bb15a48c828b2"
            },
            {
              "to": {
                "kind": null,
                "label": null,
                "address": "0x3fe04a59ebd38cf06080a6f60a98d124eb59392a"
              },
              "usd": 473223.54,
              "from": {
                "kind": null,
                "label": null,
                "address": "0x2192bc3b4028acc1113f2cd9ac2cba70c36520db"
              },
              "time": "2026-10-15T06:45:25.000Z",
              "block": 52628689,
              "amount": 473223.54,
              "txHash": "0x47b226f0a3037b1d91255aebb5e1bb14ddde5485c1609e49afe3fc7dfa0ce815"
            },
            {
              "to": {
                "kind": null,
                "label": null,
                "address": "0x3fe04a59ebd38cf06080a6f60a98d124eb59392a"
              },
              "usd": 338654.14,
              "from": {
                "kind": null,
                "label": null,
                "address": "0x8d05e14ae19546f9f22d3c5b3470ef3337baa57c"
              },
              "time": "2026-10-15T06:45:29.000Z",
              "block": 52628691,
              "amount": 338654.14,
              "txHash": "0xf9dbfec3c6c77f623f9b86363720fed89f1730a1bc79232bc45c534999bc6c0b"
            }
          ],
          "truncated": true,
          "disclaimer": "Information only, not financial advice.",
          "tokenAddress": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
        }
      }
    },
    "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": {
                "chain": {
                  "type": "string",
                  "description": "ethereum (default), base, arbitrum, optimism or polygon"
                },
                "limit": {
                  "type": "string",
                  "description": "Transfers to return, 1 to 50, default 20"
                },
                "token": {
                  "type": "string",
                  "description": "USDC (default), USDT, WETH, WBTC or cbBTC, where the chain has it"
                },
                "blocks": {
                  "type": "string",
                  "description": "Blocks to scan back from the latest: ethereum 10 (default, max 25), base and optimism 20 (max 40), arbitrum and polygon 40 (max 80)"
                },
                "minUsd": {
                  "type": "string",
                  "description": "Minimum USD value per transfer, default 1000000, at least 10000"
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-21 21:45Z
Last indexed by Roundhouse
2026-10-26 17:20Z
Last enriched (probe, favicon, geo)
2026-10-15 11:15Z
x402 version
2
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. 15 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 SiteCheck 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=SiteCheck'
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.sitecheck-api.workers.dev/api/crypto/whales, 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.