Roundhouse

Vextorium

Largest holders of each outcome of a Polymarket market (by slug): wallet and shares, with the sum of the top holders. See where the whales are betting.

DataLiveeip155:8453Exactvia cdp
https://api.vextorium.com/polymarket-holders-pago
PolymarketHoldersWhalesPrediction-marketsConcentration
Calls · 30d
2→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 19 snapshots so far.
$13.51
Verified settled volume
3,580 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.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-06 04:04Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf

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.

0.004USDC≈ $0.004 USD
on Base · exact scheme

Pay 0.004 USDC on Base to 0xb9f0…71aCf. The signed payment is good for 5 minutes.

Paid to
0xb9f0…71aCf
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
4000 smallest units
4000units
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
HcjfmZ…t3pz2
Token contract
EPjFWd…TDt1v
Payment window
5 minutes
4000units
on Polygon · 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
0xb9f0…71aCf
Token contract
0x3c49…c3359
Payment window
5 minutes
4000units
on Optimism · 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
0xb9f0…71aCf
Token contract
0x0b2C…7Ff85
Payment window
168 hours
4000units
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
0xb9f0…71aCf
Token contract
0x3600…00000
Payment window
168 hours
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf",
    "amount": "4000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "4ZHcGaij9ktYqm9dNvMSMLsbT5D7BUrXDEzQGVH5h3Q6"
    },
    "payTo": "HcjfmZLgWRZzwj4deEiS7pewc4KBYSw39mW5nTyt3pz2",
    "amount": "4000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf",
    "amount": "4000",
    "scheme": "exact",
    "network": "eip155:137",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85",
    "extra": {
      "name": "GatewayWalletBatched",
      "assets": [
        {
          "symbol": "USDC",
          "address": "0x0b2c639c533813f4aa9d7837caf62653d097ff85",
          "decimals": 6
        }
      ],
      "version": "1",
      "verifyingContract": "0x77777777dcc4d5a8b6e418fd04d8997ef11000ee",
      "minValiditySeconds": 604800
    },
    "payTo": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf",
    "amount": "4000",
    "scheme": "exact",
    "network": "eip155:10",
    "maxTimeoutSeconds": 604900
  },
  {
    "asset": "0x3600000000000000000000000000000000000000",
    "extra": {
      "name": "GatewayWalletBatched",
      "assets": [
        {
          "symbol": "USDC",
          "address": "0x3600000000000000000000000000000000000000",
          "decimals": 6
        }
      ],
      "version": "1",
      "verifyingContract": "0x77777777dcc4d5a8b6e418fd04d8997ef11000ee",
      "minValiditySeconds": 604800
    },
    "payTo": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf",
    "amount": "4000",
    "scheme": "exact",
    "network": "eip155:5042",
    "maxTimeoutSeconds": 604900
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "slug": "will-oprah-winfrey-win-the-2028-democratic-presidential-nomination",
          "limite": 3
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "slug": "will-oprah-winfrey-win-the-2028-democratic-presidential-nomination",
          "fuente": "Polymarket (API pública de datos)",
          "pregunta": "Will Oprah Winfrey win the 2028 Democratic presidential nomination?",
          "resultados": [
            {
              "mayores": [
                {
                  "cartera": "0x5d189e816b4149be00977c1a3c8840374aec4972",
                  "participaciones": 2441726.05
                },
                {
                  "cartera": "0xbefa95c276ee8ef6ff3ef43d1c1c454f52bc300d",
                  "participaciones": 81912.91
                }
              ],
              "resultado": "Yes",
              "suma_participaciones": 2603019.75
            },
            {
              "mayores": [
                {
                  "cartera": "0xa5ef39c3d3e10d0b270233af41cac69796b12966",
                  "participaciones": 3132849.11
                },
                {
                  "cartera": "0xd7508a67410adb7bb0004f5073dc285a750b5235",
                  "participaciones": 231.63
                }
              ],
              "resultado": "No",
              "suma_participaciones": 3133258.36
            }
          ]
        }
      }
    },
    "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": {
              "required": [
                "slug"
              ],
              "properties": {
                "slug": {
                  "type": "string"
                },
                "limite": {
                  "type": "integer",
                  "description": "1-20"
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": [
                "object",
                "null"
              ],
              "properties": {
                "slug": {
                  "type": [
                    "string",
                    "null"
                  ]
                },
                "fuente": {
                  "type": [
                    "string",
                    "null"
                  ]
                },
                "pregunta": {
                  "type": [
                    "string",
                    "null"
                  ]
                },
                "resultados": {
                  "type": [
                    "array",
                    "null"
                  ],
                  "items": {
                    "type": [
                      "null",
                      "object"
                    ],
                    "properties": {
                      "mayores": {
                        "type": [
                          "array",
                          "null"
                        ],
                        "items": {
                          "type": [
                            "null",
                            "object"
                          ],
                          "properties": {
                            "cartera": {
                              "type": [
                                "null",
                                "string"
                              ]
                            },
                            "participaciones": {
                              "type": [
                                "null",
                                "number"
                              ]
                            }
                          }
                        }
                      },
                      "resultado": {
                        "type": [
                          "null",
                          "string"
                        ]
                      },
                      "suma_participaciones": {
                        "type": [
                          "null",
                          "number"
                        ]
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-06 04:04Z
Last indexed by Roundhouse
2026-10-17 07:40Z
Last enriched (probe, favicon, geo)
2026-10-03 03:45Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 200
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. 19 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 Vextorium 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=Vextorium'
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.vextorium.com/polymarket-holders-pago, 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.