Roundhouse

skills.onesource.io

Total supply of an ERC20 or ERC721 token contract via totalSupply (eth_call)

OtherLiveeip155:8453Exactvia cdp
https://skills.onesource.io/api/chain/total-supply
Settlements · 30d
16,704↓ 31%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$20.97
Verified settled volume
A floor: summed over 5,000 of up to 90,415 indexed settlements. The exact verified count is not computed for a wallet this size.
$0.0030
Listed price
As published in the catalog. Always read the live 402 before paying.
279
Calls · 30d
Upstream's own call count for this endpoint, not ours.
276
Unique payers · 30d
Last called 2026-06-10 05:42Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea

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.

{
  "meta": {
    "network": "eip155:8453",
    "endpoint": "/api/chain/total-supply",
    "cost_usdc": "0.003"
  },
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2",
        "credentialTypes": [
          "authorization"
        ]
      },
      "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
      "amount": "3000",
      "scheme": "exact",
      "network": "eip155:8453",
      "currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "recipient": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
      "maxAmountRequired": "3000",
      "maxTimeoutSeconds": 3600
    },
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2",
        "withdrawDelay": 86400,
        "receiverAuthorizer": "0x11dF9F6280632aB8F12926b3f569E493EaEcf81b"
      },
      "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
      "amount": "3000",
      "scheme": "batch-settlement",
      "network": "eip155:8453",
      "currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "recipient": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
      "maxAmountRequired": "3000",
      "maxTimeoutSeconds": 3600
    }
  ],
  "resource": {
    "url": "https://api.onesource.io/api/chain/total-supply",
    "mimeType": "application/json",
    "description": "Total supply of an ERC20 or ERC721 token contract via totalSupply (eth_call)"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "network": "ethereum",
            "contract": "0xdac17f958d2ee523a2206206994597c13d831ec7"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "data": {
              "name": "Tether USD",
              "symbol": "USDT",
              "decimals": 6,
              "is_erc721": false,
              "total_supply": "39283948340000000",
              "contract_address": "0xdac17f958d2ee523a2206206994597c13d831ec7"
            },
            "meta": {
              "endpoint": "/api/chain/total-supply",
              "cost_usdc": "0.001",
              "request_id": "00000000abcdef01",
              "payment_chain": "base",
              "payment_token": "USDC"
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "HEAD",
                  "DELETE"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "contract"
                ],
                "properties": {
                  "network": {
                    "enum": [
                      "ethereum",
                      "sepolia",
                      "robinhood"
                    ],
                    "type": "string",
                    "default": "ethereum"
                  },
                  "contract": {
                    "type": "string",
                    "pattern": "^0x[a-fA-F0-9]{40}$"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "required": [
                  "data",
                  "meta"
                ],
                "properties": {
                  "data": {
                    "type": "object",
                    "properties": {
                      "name": {
                        "type": "string"
                      },
                      "symbol": {
                        "type": "string"
                      },
                      "decimals": {
                        "type": "integer"
                      },
                      "is_erc721": {
                        "type": "boolean"
                      },
                      "total_supply": {
                        "type": "string"
                      },
                      "contract_address": {
                        "type": "string"
                      }
                    },
                    "description": "Endpoint-specific response payload"
                  },
                  "meta": {
                    "type": "object",
                    "required": [
                      "endpoint",
                      "request_id"
                    ],
                    "properties": {
                      "endpoint": {
                        "type": "string"
                      },
                      "cost_usdc": {
                        "type": "string"
                      },
                      "request_id": {
                        "type": "string"
                      },
                      "payment_chain": {
                        "type": "string"
                      },
                      "payment_token": {
                        "type": "string"
                      }
                    }
                  },
                  "error": {
                    "type": [
                      "object",
                      "null"
                    ],
                    "properties": {
                      "code": {
                        "type": "integer"
                      },
                      "message": {
                        "type": "string"
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2,
  "payment_rails": [
    {
      "rail": "x402",
      "chain": "eip155:8453",
      "assets": [
        "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
      ],
      "recipient": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea"
    },
    {
      "rail": "mpp",
      "chain": "tempo:4217",
      "assets": [
        "0x20c000000000000000000000b9537d11c60e8b50",
        "0x20c0000000000000000000000000000000000000"
      ],
      "recipient": "0x19B8e99079A5558ff4460357b0a78e14a7F600B7"
    }
  ],
  "api_key_subscription": {
    "url": "https://onesource.io/rest-api#pricing",
    "description": "Alternative to paying per call: a flat-rate monthly subscription authenticated with `Authorization: Bearer <key>`. No wallet, stablecoin, or on-chain settlement required. Use this if the client cannot custody a private key, if billing must be invoiced, or if per-call pricing costs more than a flat fee at your volume."
  }
}

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 0x52E2…1f3ea. The signed payment is good for 1 hour.

Paid to
0x52E2…1f3ea
USD Coin contract
0x8335…02913
Payment window
1 hour
As published
3000 smallest units
0.003USDC≈ $0.003 USD
on Base · batch-settlement scheme

Pay 0.003 USDC on Base to 0x52E2…1f3ea. The signed payment is good for 1 hour.

Paid to
0x52E2…1f3ea
USD Coin contract
0x8335…02913
Payment window
1 hour
As published
3000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "credentialTypes": [
        "authorization"
      ]
    },
    "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
    "amount": "3000",
    "scheme": "exact",
    "network": "eip155:8453",
    "currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "recipient": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
    "maxTimeoutSeconds": 3600
  },
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "withdrawDelay": 86400,
      "receiverAuthorizer": "0x11dF9F6280632aB8F12926b3f569E493EaEcf81b"
    },
    "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
    "amount": "3000",
    "scheme": "batch-settlement",
    "network": "eip155:8453",
    "currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "recipient": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
    "maxTimeoutSeconds": 3600
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "network": "ethereum",
          "contract": "0xdac17f958d2ee523a2206206994597c13d831ec7"
        },
        "type": "http",
        "method": "GET",
        "queryParams": {
          "network": "ethereum",
          "contract": "0xdac17f958d2ee523a2206206994597c13d831ec7"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "symbol": "USDT",
          "contract": "0xdac17f958d2ee523a2206206994597c13d831ec7",
          "decimals": 6,
          "total_supply": "39283948340000000"
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "contract"
              ],
              "properties": {
                "network": {
                  "enum": [
                    "ethereum",
                    "sepolia"
                  ],
                  "type": "string",
                  "default": "ethereum"
                },
                "contract": {
                  "type": "string",
                  "pattern": "^0x[a-fA-F0-9]{40}$"
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET",
                "HEAD",
                "DELETE"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "required": [
                "contract"
              ],
              "properties": {
                "network": {
                  "enum": [
                    "ethereum",
                    "sepolia"
                  ],
                  "type": "string",
                  "default": "ethereum"
                },
                "contract": {
                  "type": "string",
                  "pattern": "^0x[a-fA-F0-9]{40}$"
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "properties": {
                "data": {
                  "type": "object",
                  "description": "Response payload"
                },
                "meta": {
                  "type": "object",
                  "properties": {
                    "network": {
                      "type": "string"
                    },
                    "endpoint": {
                      "type": "string"
                    },
                    "cost_usdc": {
                      "type": "string"
                    }
                  }
                },
                "error": {
                  "type": [
                    "object",
                    "null"
                  ]
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-06-10 05:42Z
Last indexed by Roundhouse
2026-06-11 02:40Z
Last enriched (probe, favicon, geo)
2026-09-13 16:15Z
x402 version
2
Max timeout
3600s
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

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. 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 skills.onesource.io 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=skills.onesource.io'
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://skills.onesource.io/api/chain/total-supply, 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.