Roundhouse

Blackwood State Wallet Balances

Use when you need the ERC20 token balance or wallet balance of an address on Base for onchain data checks. Do not use for ethereum mainnet or other chains, NFTs, transaction history or USD values. Returns JSON with the ETH and ERC20 token balances of a wallet on Base, read on-chain in one block: 21 major tokens plus any you list for 0.004 USDC per call. Typical response time 1200 ms (p95). Category: Data.

DataLiveeip155:8453Exactvia cdp
https://x402-gateway.blackwoodstate8.workers.dev/v1/wallet-balances
Wallet balanceerc20OnchainData
Calls · 30d
6
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 7 snapshots so far.
$0.02
Verified settled volume
6 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.
6
Calls · 30d
Upstream's own call count for this endpoint, not ours.
3
Unique payers · 30d
Last called 2026-10-18 20:18Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xbB2F227a85e9F7405614326CeD123230D708DD90

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 0xbB2F…8DD90. The signed payment is good for 1 minute.

Paid to
0xbB2F…8DD90
USD Coin contract
0x8335…02913
Payment window
1 minute
As published
4000 smallest units
0.004USDC≈ $0.004 USD
on Base · upto scheme

Pay 0.004 USDC on Base to 0xbB2F…8DD90. The signed payment is good for 1 minute.

Paid to
0xbB2F…8DD90
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": "0xbB2F227a85e9F7405614326CeD123230D708DD90",
    "amount": "4000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  },
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "facilitatorAddress": "0x4c934c63C786157Fefd990945b25eA60a0FB0205",
      "assetTransferMethod": "permit2"
    },
    "payTo": "0xbB2F227a85e9F7405614326CeD123230D708DD90",
    "amount": "4000",
    "scheme": "upto",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "address": "0x5A6c77758820182484EA8DE614FC65423E80749a"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "native": {
            "raw": "0",
            "symbol": "ETH",
            "balance": "0"
          },
          "tokens": [
            {
              "raw": "10000",
              "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
              "symbol": "USDC",
              "balance": "0.01",
              "decimals": 6
            }
          ],
          "address": "0x5A6c77758820182484EA8DE614FC65423E80749a",
          "network": "eip155:8453",
          "notTokens": [],
          "blockNumber": 52713897,
          "checkedTokens": 21
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "address"
              ],
              "properties": {
                "tokens": {
                  "type": "array",
                  "items": {
                    "type": "string",
                    "pattern": "^0x[0-9a-fA-F]{40}$"
                  },
                  "maxItems": 20,
                  "description": "Extra ERC20 token addresses on Base to check, e.g. [\"0x4200000000000000000000000000000000000006\"] (up to 20, beyond the 21 major ones)"
                },
                "address": {
                  "type": "string",
                  "pattern": "^0x[0-9a-fA-F]{40}$",
                  "description": "Wallet address on Base, e.g. 0x5A6c77758820182484EA8DE614FC65423E80749a"
                },
                "includeZero": {
                  "type": "boolean",
                  "description": "Also list tokens with zero balance (false when omitted)"
                }
              }
            },
            "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",
              "required": [
                "address",
                "network",
                "blockNumber",
                "native",
                "tokens",
                "notTokens",
                "checkedTokens"
              ],
              "properties": {
                "next": {
                  "type": "object",
                  "required": [
                    "service",
                    "tool",
                    "method",
                    "url",
                    "useWhen",
                    "sample"
                  ],
                  "properties": {
                    "url": {
                      "type": "string",
                      "description": "Paid route of the next call"
                    },
                    "tool": {
                      "type": "string",
                      "description": "MCP tool name of the same call"
                    },
                    "method": {
                      "enum": [
                        "GET",
                        "POST"
                      ],
                      "type": "string"
                    },
                    "sample": {
                      "type": "string",
                      "description": "Free fixed sample of the whole family"
                    },
                    "service": {
                      "type": "string",
                      "description": "Service id of the suggested next paid call"
                    },
                    "useWhen": {
                      "type": "string",
                      "description": "When the next call is the right one"
                    }
                  },
                  "description": "Suggested next paid call in the same family (call it in a loop when the task continues)",
                  "additionalProperties": false
                },
                "native": {
                  "type": "object",
                  "required": [
                    "symbol",
                    "balance",
                    "raw"
                  ],
                  "properties": {
                    "raw": {
                      "type": "string"
                    },
                    "symbol": {
                      "type": "string",
                      "const": "ETH"
                    },
                    "balance": {
                      "type": "string"
                    }
                  },
                  "additionalProperties": false
                },
                "tokens": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "required": [
                      "token",
                      "symbol",
                      "decimals",
                      "balance",
                      "raw"
                    ],
                    "properties": {
                      "raw": {
                        "type": "string"
                      },
                      "token": {
                        "type": "string"
                      },
                      "symbol": {
                        "type": [
                          "string",
                          "null"
                        ]
                      },
                      "balance": {
                        "type": "string"
                      },
                      "decimals": {
                        "type": "integer",
                        "maximum": 9007199254740991,
                        "minimum": -9007199254740991
                      }
                    },
                    "additionalProperties": false
                  }
                },
                "address": {
                  "type": "string"
                },
                "network": {
                  "type": "string",
                  "const": "eip155:8453"
                },
                "notTokens": {
                  "type": "array",
                  "items": {
                    "type": "string"
                  }
                },
                "blockNumber": {
                  "type": "integer",
                  "maximum": 9007199254740991,
                  "minimum": -9007199254740991
                },
                "checkedTokens": {
                  "type": "integer",
                  "maximum": 9007199254740991,
                  "minimum": -9007199254740991
                }
              },
              "additionalProperties": false
            }
          }
        }
      }
    }
  },
  "payment-identifier": {
    "info": {
      "required": false
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "required"
      ],
      "properties": {
        "id": {
          "type": "string",
          "pattern": "^[a-zA-Z0-9_-]+$",
          "maxLength": 128,
          "minLength": 16
        },
        "required": {
          "type": "boolean"
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-18 20:18Z
Last indexed by Roundhouse
2026-10-24 16:20Z
Last enriched (probe, favicon, geo)
2026-10-17 17:15Z
x402 version
2
Max timeout
60s
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. 7 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 Blackwood State Wallet Balances 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=Blackwood%20State%20Wallet%20Balances'
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-gateway.blackwoodstate8.workers.dev/v1/wallet-balances, 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.